:root{color:#1d1d1f;background:#f5f5f7;font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,SF Pro Text,Segoe UI,system-ui,sans-serif;font-synthesis:none;--pack-bg: #f5f5f7;--pack-surface: rgba(255, 255, 255, .82);--pack-surface-solid: #ffffff;--pack-ink: #1d1d1f;--pack-muted: #6e6e73;--pack-faint: #86868b;--pack-line: rgba(0, 0, 0, .1);--pack-blue: #0071e3;--pack-blue-soft: #e8f2ff;--pack-green: #248a3d;--pack-green-soft: #e9f7ec;--pack-orange: #bf4800;--pack-orange-soft: #fff2e8;--pack-shadow: 0 24px 70px rgba(0, 0, 0, .09), 0 2px 8px rgba(0, 0, 0, .05);--pack-ease-out: cubic-bezier(.23, 1, .32, 1);--pack-ease-in-out: cubic-bezier(.77, 0, .175, 1)}*{box-sizing:border-box}html,body,#root{min-height:100%}body{margin:0;background:var(--pack-bg);color:var(--pack-ink)}button,input,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}.app-shell{min-height:100vh;background:var(--pack-bg)}.pack-topbar{position:sticky;z-index:20;top:0;display:flex;align-items:center;justify-content:space-between;height:64px;padding:0 max(20px,5vw);border-bottom:1px solid var(--pack-line);background:color-mix(in srgb,var(--pack-bg) 78%,transparent);-webkit-backdrop-filter:blur(24px) saturate(180%);backdrop-filter:blur(24px) saturate(180%)}.pack-brand,.pack-nav,.pack-nav-status{display:inline-flex;align-items:center}.pack-brand{gap:9px;font-size:14px;font-weight:650;letter-spacing:-.02em}.pack-brand-mark{display:grid;place-items:center;width:27px;height:27px;border-radius:9px;color:#fff;background:var(--pack-ink);font-size:13px;font-weight:700}.pack-nav{gap:17px;color:var(--pack-muted);font-size:12px}.pack-nav a{padding:7px 11px;border-radius:999px;transition:color .16s ease,background .16s ease,transform .16s var(--pack-ease-out)}.pack-nav a.is-active{color:var(--pack-ink);background:var(--pack-surface-solid);box-shadow:0 1px 5px #0000000f}.pack-nav-status{gap:7px;color:var(--pack-faint)}.pack-nav-status span{width:6px;height:6px;border-radius:50%;background:#34c759}.pack-demo-page{position:relative;overflow:hidden;min-height:calc(100vh - 64px);padding:clamp(54px,8vw,100px) max(18px,5vw) 45px}.pack-demo-page:before{content:"";position:absolute;z-index:0;width:680px;height:680px;top:-340px;right:-170px;border-radius:50%;pointer-events:none;background:radial-gradient(circle,rgba(0,113,227,.14),transparent 68%)}.pack-demo-noise{position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.22;background:radial-gradient(circle at 20% 20%,rgba(255,255,255,.7),transparent 30%)}.pack-hero,.pack-upload-card,.pack-preview-layout,.pack-generating-card,.pack-ready-card,.practice-shell,.pack-demo-footer{position:relative;z-index:1;width:min(1080px,100%);margin-inline:auto}.pack-hero{display:grid;justify-items:center;gap:19px;margin-bottom:52px;text-align:center;animation:pack-enter .36s var(--pack-ease-out) both}.pack-label{display:inline-flex;align-items:center;gap:7px;color:var(--pack-faint);font-size:10px;font-weight:700;letter-spacing:.12em;text-transform:uppercase}.pack-label:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--pack-blue)}.pack-label-dark{color:var(--pack-ink)}.pack-hero h1{max-width:820px;margin:0;color:var(--pack-ink);font-size:clamp(44px,8vw,88px);font-weight:700;line-height:1.02;letter-spacing:-.065em;text-wrap:balance}.pack-hero h1 em{color:var(--pack-blue);font-style:normal}.pack-hero p{max-width:570px;margin:0;color:var(--pack-muted);font-size:clamp(15px,2vw,18px);line-height:1.55;text-wrap:balance}.pack-hero-stamp{display:inline-flex;align-items:center;gap:7px;padding:8px 12px;border:1px solid var(--pack-line);border-radius:999px;color:var(--pack-muted);background:var(--pack-surface);box-shadow:0 5px 20px #0000000d;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);font-size:11px}.pack-hero-stamp strong{color:var(--pack-faint);font-weight:500}.pack-upload-card,.pack-source-card,.pack-config-card,.pack-generating-card,.pack-ready-card,.practice-card{border:1px solid var(--pack-line);border-radius:28px;background:var(--pack-surface);box-shadow:var(--pack-shadow);-webkit-backdrop-filter:blur(22px) saturate(130%);backdrop-filter:blur(22px) saturate(130%)}.pack-upload-card{display:grid;justify-items:center;padding:clamp(54px,8vw,92px) 24px 35px;text-align:center;animation:pack-enter .38s 40ms var(--pack-ease-out) both}.upload-glow{position:absolute;width:270px;height:150px;top:-110px;border-radius:50%;background:radial-gradient(circle,rgba(0,113,227,.18),transparent 67%);filter:blur(8px)}.upload-icon{position:relative;display:grid;place-items:center;width:58px;height:58px;margin-bottom:24px;border-radius:18px;color:var(--pack-blue);background:var(--pack-blue-soft)}.pack-upload-card h2,.pack-config-card h2,.pack-generating-card h2,.pack-ready-card h2{margin:0 0 10px;color:var(--pack-ink);font-size:clamp(26px,4vw,40px);font-weight:650;letter-spacing:-.045em}.pack-upload-card p,.pack-config-card>p,.pack-generating-card p,.pack-ready-card p{max-width:520px;margin:0 auto 25px;color:var(--pack-muted);line-height:1.6}.pack-loading-card{min-height:220px;align-content:center}.pack-history-card{position:relative;z-index:1;width:min(1080px,100%);margin:18px auto 0;padding:27px;border:1px solid var(--pack-line);border-radius:24px;background:var(--pack-surface);box-shadow:var(--pack-shadow);-webkit-backdrop-filter:blur(22px) saturate(130%);backdrop-filter:blur(22px) saturate(130%);animation:pack-enter .38s 80ms var(--pack-ease-out) both}.pack-history-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}.pack-history-heading h2{margin:13px 0 7px;font-size:clamp(22px,4vw,31px);letter-spacing:-.045em}.pack-history-heading p{max-width:560px;margin:0;color:var(--pack-muted);font-size:12px;line-height:1.55}.pack-history-list{display:grid;gap:9px;margin-top:22px}.pack-history-row{display:flex;align-items:center;gap:13px;min-width:0;padding:13px;border:1px solid var(--pack-line);border-radius:15px;background:var(--pack-bg)}.pack-history-icon{display:grid;flex:0 0 38px;place-items:center;width:38px;height:42px;border-radius:11px;color:var(--pack-blue);background:var(--pack-blue-soft)}.pack-history-main{min-width:0;flex:1}.pack-history-main strong,.pack-history-main span,.pack-history-main small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.pack-history-main strong{font-size:13px;font-weight:650}.pack-history-main span{margin-top:4px;color:var(--pack-muted);font-size:11px}.pack-history-main small{display:flex;align-items:center;gap:5px;margin-top:5px;color:var(--pack-faint);font-size:10px}.pack-history-actions{display:inline-flex;align-items:center;gap:7px}.pack-history-actions .pack-button{min-height:34px;padding-inline:12px;font-size:11px}.pack-danger-button{color:var(--pack-orange)}.pack-icon-button.pack-danger-button{border-color:color-mix(in srgb,var(--pack-orange) 40%,transparent)}.pack-history-notice{margin-top:17px;padding-top:14px;border-top:1px solid var(--pack-line);color:var(--pack-faint);font-size:10px;line-height:1.5}.pack-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 18px;border:0;border-radius:999px;cursor:pointer;color:#fff;background:var(--pack-blue);box-shadow:0 7px 15px #0071e333;font-size:13px;font-weight:650;transition:transform .16s var(--pack-ease-out),box-shadow .16s var(--pack-ease-out),background .16s ease}.pack-button:focus-visible{outline:3px solid color-mix(in srgb,var(--pack-blue) 35%,transparent);outline-offset:2px}.pack-button:hover{background:#0077ed}.pack-button:active,.pack-icon-button:active,.option-row:active{transform:scale(.97)}.pack-button-dark{color:#fff;background:var(--pack-ink);box-shadow:0 7px 15px #00000024}.pack-button-dark:hover{background:#303033}.pack-button-accent{color:#fff;background:var(--pack-blue)}.pack-button-secondary{color:var(--pack-ink);border:1px solid var(--pack-line);background:var(--pack-surface-solid);box-shadow:none}.pack-button-secondary:hover{color:var(--pack-blue);border-color:color-mix(in srgb,var(--pack-blue) 45%,var(--pack-line));background:var(--pack-blue-soft)}.pack-button-quiet{color:var(--pack-blue);background:transparent;box-shadow:none}.pack-text-button{display:inline-flex;align-items:center;gap:6px;margin-top:14px;padding:5px 0;border:0;color:var(--pack-muted);background:transparent;cursor:pointer;font-size:12px;font-weight:600;transition:color .16s ease,transform .16s var(--pack-ease-out)}.pack-text-button:hover{color:var(--pack-blue)}.upload-meta{display:flex;flex-wrap:wrap;justify-content:center;gap:18px;margin-top:35px;color:var(--pack-faint);font-size:11px}.upload-meta span,.practice-hint{display:inline-flex;align-items:center;gap:5px}.pack-preview-layout{display:grid;grid-template-columns:minmax(260px,.74fr) minmax(380px,1.26fr);gap:18px;animation:pack-enter .36s var(--pack-ease-out) both}.pack-source-card,.pack-config-card{padding:27px}.pack-source-card{align-self:start;color:#fff;background:#1d1d1f;border-color:#ffffff24;box-shadow:0 24px 70px #0000002e}.pack-source-card .pack-label{color:#ffffff94}.pack-source-card .pack-label:before{background:#34c759}.source-method{color:#ffffff94;font-size:10px}.pack-source-topline,.pack-config-footer,.pack-file,.pack-progress,.pack-source-stats,.generating-footer,.practice-top,.practice-heading,.practice-actions{display:flex;align-items:center;justify-content:space-between;gap:14px}.pack-icon-button{display:inline-grid;place-items:center;width:34px;height:34px;padding:0;border:1px solid currentColor;border-radius:50%;color:inherit;background:transparent;cursor:pointer;transition:transform .16s var(--pack-ease-out),background .16s ease}.pack-icon-button:hover{background:#0000000f}.pack-source-card .pack-icon-button:hover{background:#ffffff1f}.pack-file{justify-content:flex-start;margin:48px 0 27px}.pack-file-icon{display:grid;flex:0 0 46px;place-items:center;width:46px;height:55px;border-radius:12px;color:var(--pack-blue);background:#edf5ff}.pack-file strong,.pack-file span{display:block;max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.pack-file strong{font-size:14px;font-weight:600}.pack-file span{margin-top:5px;color:#ffffff8f;font-size:11px}.pack-progress{justify-content:flex-start;gap:9px;color:#ffffff8f;font-size:11px}.pack-progress span{width:7px;height:7px;border-radius:50%;background:#34c759}.pack-progress b{color:#fff;font-weight:600}.pack-progress small{margin-left:auto;color:#ffffff70;font-size:10px}.pack-source-stats{justify-content:flex-start;gap:24px;margin-top:49px;padding-top:19px;border-top:1px solid rgba(255,255,255,.13)}.pack-source-stats strong,.pack-source-stats span{display:block}.pack-source-stats strong{font-size:25px;font-weight:600;letter-spacing:-.05em}.pack-source-stats span{margin-top:3px;color:#ffffff85;font-size:10px}.pack-source-note{display:flex;align-items:flex-start;gap:8px;margin-top:28px;padding:12px;border-radius:12px;color:#ffffffad;background:#ffffff14;font-size:11px;line-height:1.45}.pack-source-note-warn{margin-top:10px;color:#ffd60a;background:#ffd60a1a}.pack-config-card{background:var(--pack-surface-solid)}.pack-config-card h2{margin-top:25px}.chapter-list{display:grid;gap:9px;margin:29px 0 25px}.chapter-row{display:flex;align-items:center;gap:11px;width:100%;min-height:58px;padding:10px 12px;border:1px solid var(--pack-line);border-radius:15px;color:var(--pack-ink);background:var(--pack-bg);cursor:pointer;font:inherit;text-align:left;transition:transform .18s var(--pack-ease-out),background .16s ease,border-color .16s ease}.chapter-row:hover{transform:translate(3px);background:var(--pack-blue-soft)}.chapter-row:focus-visible{outline:3px solid color-mix(in srgb,var(--pack-blue) 35%,transparent);outline-offset:2px;border-color:var(--pack-blue)}.chapter-row>svg{margin-left:auto;color:var(--pack-faint)}.chapter-dot{width:9px;height:9px;border-radius:50%}.chapter-dot.lime{background:#34c759}.chapter-dot.blue{background:var(--pack-blue)}.chapter-dot.coral{background:#ff9f0a}.chapter-row strong,.chapter-row small{display:block}.chapter-row-content{min-width:0;flex:1}.chapter-row strong{font-size:13px;font-weight:600}.chapter-row small{margin-top:4px;color:var(--pack-faint);font-size:11px}.chapter-row em{display:block;max-width:580px;margin-top:6px;overflow:hidden;color:var(--pack-faint);font-size:10px;font-style:normal;line-height:1.45;text-overflow:ellipsis;white-space:nowrap}.chapter-row-action{display:block;margin-top:7px;color:var(--pack-blue);font-size:10px;font-weight:650;opacity:.72;transition:opacity .16s ease}.chapter-row:hover .chapter-row-action,.chapter-row:focus-visible .chapter-row-action{opacity:1}.source-preview-backdrop{position:fixed;z-index:100;inset:0;display:grid;place-items:center;padding:22px;background:#12121485;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);animation:pack-fade-in .18s ease both}.source-preview-dialog{display:flex;flex-direction:column;width:min(920px,100%);max-height:min(820px,calc(100vh - 44px));overflow:hidden;border:1px solid var(--pack-line);border-radius:24px;background:var(--pack-surface-solid);box-shadow:0 28px 90px #00000047;animation:pack-enter .24s var(--pack-ease-out) both}.source-preview-header{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;padding:24px 26px 18px;border-bottom:1px solid var(--pack-line)}.source-preview-header h3{margin:10px 0 5px;font-size:clamp(22px,4vw,30px);letter-spacing:-.045em}.source-preview-header p{margin:0;color:var(--pack-muted);font-size:11px;line-height:1.5}.source-preview-body{min-height:120px;overflow:auto;padding:20px 26px 24px}.source-preview-status,.source-preview-empty{display:flex;align-items:center;justify-content:center;gap:8px;min-height:150px;color:var(--pack-muted);font-size:12px;text-align:center}.source-page{padding:15px 0 20px;border-bottom:1px solid var(--pack-line)}.source-page:last-child{border-bottom:0}.source-page-header{display:flex;align-items:center;gap:9px;margin-bottom:10px}.source-page-header strong{font-size:12px}.source-page-header span{padding:3px 7px;border-radius:999px;color:var(--pack-faint);background:var(--pack-bg);font-size:9px}.source-page p{margin:0;color:var(--pack-muted);white-space:pre-wrap;font-size:13px;line-height:1.75}.source-page-empty{color:var(--pack-faint);font-style:italic}.source-page mark{padding:1px 3px;border-radius:4px;color:inherit;background:#ffd60a73}.source-page p small{display:block;margin-top:10px;color:var(--pack-faint);font-size:10px}.source-preview-note{display:flex;align-items:flex-start;gap:8px;padding:12px 26px 17px;border-top:1px solid var(--pack-line);color:var(--pack-faint);font-size:10px;line-height:1.5}.source-pdf-preview{height:min(48vh,480px);padding:14px 26px 0;background:var(--pack-bg)}.source-pdf-preview iframe{display:block;width:100%;height:100%;border:1px solid var(--pack-line);border-radius:12px;background:#fff}.spin{animation:pack-spin .9s linear infinite}.pack-config-footer{flex-wrap:wrap;align-items:flex-end;padding-top:19px;border-top:1px solid var(--pack-line)}.pack-config-footer div span,.pack-config-footer div strong{display:block}.pack-config-footer div span{color:var(--pack-faint);font-size:10px}.pack-config-footer div strong{margin-top:4px;font-size:16px;font-weight:650}.pack-config-footer .pack-button{margin-left:auto}.pack-generating-card,.pack-ready-card{display:grid;justify-items:center;padding:clamp(50px,8vw,92px) 24px;text-align:center;animation:pack-enter .36s var(--pack-ease-out) both}.generating-orbit{display:grid;place-items:center;width:88px;height:88px;margin-bottom:28px;border:1px solid var(--pack-line);border-radius:50%}.orbit-core{display:grid;place-items:center;width:57px;height:57px;border-radius:18px;color:#fff;background:var(--pack-blue);box-shadow:0 10px 25px #0071e340;animation:pack-breathe 1.7s ease-in-out infinite}.big-progress{width:min(480px,100%);height:8px;margin-top:22px;overflow:hidden;border-radius:999px;background:#e5e5ea}.big-progress span,.practice-progress span{display:block;height:100%;border-radius:inherit;background:var(--pack-blue);transition:width .22s var(--pack-ease-out)}.generating-footer{width:min(480px,100%);margin-top:12px;color:var(--pack-faint);font-size:11px}.generating-footer strong{color:var(--pack-ink);font-size:14px;font-weight:650}.pack-generating-card.is-failed .orbit-core{color:#1d1d1f;background:#fc0;box-shadow:0 10px 25px #ffcc0040;animation:none}.ready-mark{display:grid;place-items:center;width:64px;height:64px;margin-bottom:25px;border-radius:50%;color:#fff;background:var(--pack-green);box-shadow:0 11px 24px #248a3d33}.ready-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:10px}.ready-provider{margin-top:22px;color:var(--pack-faint);font-size:10px}.practice-shell{animation:pack-enter .36s var(--pack-ease-out) both}.practice-top{margin-bottom:14px}.practice-top .pack-text-button{margin:0;color:var(--pack-ink)}.practice-counter{color:var(--pack-faint);font-size:11px;font-weight:650;letter-spacing:.1em}.rotate-180{transform:rotate(180deg)}.practice-progress{height:6px;margin-bottom:17px;overflow:hidden;border-radius:999px;background:#e5e5ea}.practice-card{padding:clamp(24px,5vw,56px);background:var(--pack-surface-solid)}.practice-previous{flex:0 0 auto;min-height:37px;padding-inline:13px;font-size:11px}.practice-previous:disabled{cursor:not-allowed;opacity:.45;box-shadow:none;transform:none}.practice-previous:disabled:hover{color:var(--pack-ink);border-color:var(--pack-line);background:var(--pack-surface-solid)}.question-type,.source-chip{display:inline-flex;align-items:center;gap:6px;min-height:27px;padding:0 10px;border-radius:999px;font-size:10px;font-weight:650}.question-type{color:var(--pack-blue);background:var(--pack-blue-soft)}.source-chip{color:var(--pack-muted);background:var(--pack-bg)}.practice-card h2{max-width:780px;margin:34px 0 28px;color:var(--pack-ink);font-size:clamp(23px,4vw,36px);font-weight:650;line-height:1.24;letter-spacing:-.045em}.option-list{display:grid;gap:10px}.option-row{display:flex;align-items:center;gap:13px;width:100%;min-height:62px;padding:12px 15px;border:1px solid var(--pack-line);border-radius:15px;color:var(--pack-ink);background:var(--pack-surface-solid);cursor:pointer;font-size:13px;text-align:left;transition:border-color .16s ease,background .16s ease,transform .16s var(--pack-ease-out)}.option-row:hover{border-color:#0071e366;transform:translateY(-1px)}.option-row.selected{border-color:var(--pack-blue);background:var(--pack-blue-soft)}.option-row.correct{border-color:#248a3d5c;background:var(--pack-green-soft)}.option-row.wrong{border-color:#bf48005c;background:var(--pack-orange-soft)}.option-letter{display:inline-grid;flex:0 0 29px;place-items:center;width:29px;height:29px;border:1px solid var(--pack-line);border-radius:50%;color:var(--pack-muted);font-size:11px;font-weight:650}.option-row>svg{margin-left:auto;color:var(--pack-green)}.answer-panel{margin-top:21px;padding:17px;border-radius:14px;background:var(--pack-bg)}.answer-good{border-left:3px solid var(--pack-green)}.answer-bad{border-left:3px solid var(--pack-orange)}.answer-title{font-size:13px;font-weight:650}.answer-panel p{margin:6px 0 9px;color:var(--pack-muted);font-size:12px;line-height:1.55}.answer-panel span{display:inline-flex;align-items:center;gap:5px;color:var(--pack-faint);font-size:10px}.source-excerpt{display:flex;align-items:flex-start;gap:6px;color:var(--pack-faint);font-size:10px;line-height:1.45}.source-excerpt svg{flex:0 0 auto;margin-top:1px}.answer-input-wrap{border:1px solid var(--pack-line);border-radius:15px;background:var(--pack-bg)}.answer-input-wrap textarea{display:block;width:100%;padding:15px;border:0;outline:0;resize:vertical;color:var(--pack-ink);background:transparent;font-size:14px;line-height:1.6}.answer-input-footer{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-top:1px solid var(--pack-line);color:var(--pack-faint);font-size:10px}.answer-input-footer .pack-button{min-height:37px;font-size:11px}.answer-input-footer .pack-button:disabled{cursor:not-allowed;opacity:.45}.practice-actions{justify-content:space-between;min-height:45px;margin-top:27px}.practice-action-main{display:flex;min-width:0;flex:1;align-items:center;justify-content:flex-end}.practice-action-main .practice-hint{justify-content:flex-end;text-align:right}.practice-hint{color:var(--pack-faint);font-size:11px}.practice-session-note{margin-top:14px;color:var(--pack-faint);font-size:10px;text-align:right}.pack-secondary-actions{position:relative;z-index:1;display:flex;align-items:center;justify-content:center;gap:15px;width:min(1080px,100%);margin:16px auto 0}.pack-secondary-actions .pack-text-button{margin:0}.pack-error,.pack-inline-error{display:inline-flex;align-items:center;gap:7px;color:var(--pack-orange);font-size:11px;line-height:1.5}.pack-error{max-width:600px;margin-top:18px;padding:10px 13px;border-radius:12px;background:var(--pack-orange-soft)}.pack-demo-footer{display:flex;justify-content:space-between;gap:20px;padding-top:30px;color:var(--pack-faint);font-size:10px}.pack-demo-footer span{display:inline-flex;align-items:center;gap:6px}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;clip-path:inset(50%)}@keyframes pack-enter{0%{opacity:0;transform:translateY(8px) scale(.985)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes pack-fade-in{0%{opacity:0}to{opacity:1}}@keyframes pack-spin{to{transform:rotate(360deg)}}@keyframes pack-breathe{0%,to{transform:scale(1)}50%{transform:scale(1.04)}}@media(hover:hover)and (pointer:fine){.pack-nav a:hover{color:var(--pack-ink);background:var(--pack-surface-solid);transform:translateY(-1px)}}@media(prefers-reduced-motion:reduce){.pack-demo-page *,.pack-demo-page *:before,.pack-demo-page *:after{animation-duration:.2s!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}.orbit-core{animation:none}}@media(prefers-reduced-transparency:reduce){.pack-topbar,.pack-upload-card,.pack-history-card,.pack-source-card,.pack-config-card,.pack-generating-card,.pack-ready-card,.practice-card{-webkit-backdrop-filter:none;backdrop-filter:none;background:var(--pack-surface-solid)}}@media(prefers-color-scheme:dark){:root{color:#f5f5f7;background:#1d1d1f;--pack-bg: #1d1d1f;--pack-surface: rgba(44, 44, 46, .82);--pack-surface-solid: #2c2c2e;--pack-ink: #f5f5f7;--pack-muted: #a1a1a6;--pack-faint: #8e8e93;--pack-line: rgba(255, 255, 255, .14);--pack-blue-soft: rgba(0, 113, 227, .22);--pack-green-soft: rgba(36, 138, 61, .22);--pack-orange-soft: rgba(191, 72, 0, .22);--pack-shadow: 0 24px 70px rgba(0, 0, 0, .3)}.pack-source-card{background:#111113}.pack-file-icon{background:#ffffff1a}.pack-button-dark{color:#1d1d1f;background:#f5f5f7}.pack-button-dark:hover{background:#fff}}@media(max-width:780px){.pack-preview-layout{grid-template-columns:1fr}.pack-source-card{order:2}.pack-config-footer .pack-button{width:100%;margin-top:10px}.chapter-row-action{opacity:1}}@media(max-width:520px){.pack-topbar{height:58px;padding-inline:15px}.pack-nav-status{display:none}.pack-demo-page{padding-inline:14px}.pack-hero h1{font-size:48px}.pack-upload-card,.pack-source-card,.pack-config-card,.pack-generating-card,.pack-ready-card,.practice-card{border-radius:22px}.pack-file strong{max-width:175px}.practice-heading{align-items:flex-start;flex-direction:column}.practice-card h2{margin-top:24px}.pack-demo-footer{display:grid;gap:8px}.pack-history-card{padding:20px 16px;border-radius:20px}.pack-history-heading{flex-direction:column;gap:7px}.pack-history-heading .pack-text-button{margin-top:4px}.pack-history-row{align-items:flex-start;flex-wrap:wrap}.pack-history-actions{width:100%;margin-left:51px}.pack-history-actions .pack-button{flex:1}.source-preview-backdrop{padding:10px}.source-preview-dialog{max-height:calc(100vh - 20px);border-radius:18px}.source-preview-header,.source-preview-body,.source-preview-note{padding-inline:18px}.source-pdf-preview{height:38vh;padding-inline:18px}}.pack-generating-card{display:block;padding:clamp(28px,5vw,54px);text-align:left}.trace-headline,.trace-panel-heading,.trace-progress-row,.trace-call-detail-head,.trace-clock,.trace-token-line,.trace-bottleneck{display:flex;align-items:center;justify-content:space-between;gap:14px}.trace-headline{align-items:flex-start;margin-bottom:23px}.trace-headline h2{margin-top:12px}.trace-subtitle{display:flex;align-items:center;gap:7px;margin:0;color:var(--pack-muted);font-size:12px}.trace-transport{display:inline-flex;align-items:center;gap:7px;flex:0 0 auto;min-height:31px;padding:0 11px;border:1px solid var(--pack-line);border-radius:999px;color:var(--pack-muted);background:var(--pack-bg);font-size:10px;font-weight:700;letter-spacing:.04em}.trace-transport.is-sse{color:var(--pack-green);background:var(--pack-green-soft)}.trace-transport.is-reconnecting{color:var(--pack-orange);background:var(--pack-orange-soft)}.trace-progress-row{margin-bottom:20px}.trace-progress-row .big-progress{flex:1;margin-top:0}.trace-progress-row>strong{min-width:42px;color:var(--pack-ink);font-size:13px;text-align:right}.trace-layout{display:grid;grid-template-columns:minmax(235px,.7fr) minmax(0,1.3fr);gap:14px}.trace-side,.trace-main{display:grid;align-content:start;gap:14px;min-width:0}.trace-panel{min-width:0;padding:18px;border:1px solid var(--pack-line);border-radius:18px;background:color-mix(in srgb,var(--pack-surface-solid) 78%,transparent)}.trace-panel-heading{align-items:flex-start;margin-bottom:15px}.trace-panel-heading .pack-label{font-size:9px}.trace-panel-heading h3{margin:5px 0 0;color:var(--pack-ink);font-size:17px;letter-spacing:-.035em}.trace-panel-heading>svg{color:var(--pack-faint)}.trace-clock{justify-content:flex-start;margin:4px 0 16px;color:var(--pack-muted)}.trace-clock strong{color:var(--pack-ink);font-size:23px;font-variant-numeric:tabular-nums;letter-spacing:-.045em}.trace-clock span{color:var(--pack-faint);font-size:10px}.trace-metric-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.trace-metric-grid div{padding:10px;border-radius:12px;background:var(--pack-bg)}.trace-metric-grid span,.trace-metric-grid strong{display:block}.trace-metric-grid span{color:var(--pack-faint);font-size:10px}.trace-metric-grid strong{margin-top:4px;color:var(--pack-ink);font-size:13px;font-variant-numeric:tabular-nums}.trace-token-line{align-items:flex-start;margin-top:12px;padding-top:12px;border-top:1px solid var(--pack-line);color:var(--pack-faint);font-size:10px}.trace-token-line strong{color:var(--pack-muted);font-size:10px;font-variant-numeric:tabular-nums;text-align:right}.trace-bottleneck{align-items:flex-start;margin-top:11px;padding-top:11px;border-top:1px solid var(--pack-line);color:var(--pack-faint);font-size:10px}.trace-bottleneck strong{color:var(--pack-orange);font-size:10px;text-align:right}.trace-stages{display:grid;gap:0;margin:0;padding:0;list-style:none}.trace-stage{position:relative;display:flex;align-items:flex-start;gap:10px;min-height:52px;color:var(--pack-faint)}.trace-stage:not(:last-child):after{content:"";position:absolute;top:23px;bottom:0;left:10px;width:1px;background:var(--pack-line)}.trace-stage-dot{position:relative;z-index:1;display:grid;flex:0 0 21px;place-items:center;width:21px;height:21px;border:1px solid var(--pack-line);border-radius:50%;color:var(--pack-faint);background:var(--pack-surface-solid)}.trace-stage-dot>span{width:5px;height:5px;border-radius:50%;background:currentColor}.trace-stage div{min-width:0;padding-top:1px}.trace-stage strong,.trace-stage small{display:block}.trace-stage strong{color:var(--pack-muted);font-size:12px;font-weight:650}.trace-stage small{margin-top:3px;color:var(--pack-faint);font-size:10px;line-height:1.35}.trace-stage.is-active .trace-stage-dot{color:var(--pack-blue);border-color:var(--pack-blue);box-shadow:0 0 0 4px var(--pack-blue-soft)}.trace-stage.is-active strong{color:var(--pack-blue)}.trace-stage.is-completed .trace-stage-dot{color:var(--pack-green);border-color:var(--pack-green);background:var(--pack-green-soft)}.trace-stage.is-completed strong{color:var(--pack-ink)}.trace-stage.is-failed .trace-stage-dot{color:var(--pack-orange);border-color:var(--pack-orange);background:var(--pack-orange-soft)}.trace-stage.is-failed strong{color:var(--pack-orange)}.trace-follow-control{display:inline-flex;align-items:center;gap:6px;color:var(--pack-muted);font-size:10px;cursor:pointer}.trace-follow-control input{accent-color:var(--pack-blue)}.trace-call-layout{display:grid;grid-template-columns:minmax(145px,.35fr) minmax(0,1fr);gap:10px;min-width:0}.trace-call-list{display:grid;align-content:start;gap:6px;min-width:0}.trace-call-item{display:flex;align-items:center;gap:8px;width:100%;min-height:52px;padding:8px 9px;border:1px solid transparent;border-radius:11px;color:var(--pack-muted);background:var(--pack-bg);cursor:pointer;text-align:left}.trace-call-item:hover,.trace-call-item.is-selected{border-color:color-mix(in srgb,var(--pack-blue) 38%,var(--pack-line));background:var(--pack-blue-soft)}.trace-call-item>span:nth-child(2){min-width:0;flex:1}.trace-call-item strong,.trace-call-item small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.trace-call-item strong{color:var(--pack-ink);font-size:11px;font-weight:650}.trace-call-item small{margin-top:3px;color:var(--pack-faint);font-size:9px}.trace-call-item>svg{flex:0 0 auto;color:var(--pack-faint)}.trace-call-status{flex:0 0 7px!important;width:7px;height:7px;border-radius:50%;background:var(--pack-faint)}.trace-call-status.is-streaming{background:var(--pack-blue);box-shadow:0 0 0 4px var(--pack-blue-soft)}.trace-call-status.is-completed{background:var(--pack-green)}.trace-call-status.is-failed{background:var(--pack-orange)}.trace-call-detail{min-width:0;overflow:hidden;border-radius:12px;background:var(--pack-bg)}.trace-call-detail-head{align-items:flex-start;padding:12px 13px;border-bottom:1px solid var(--pack-line)}.trace-call-detail-head strong,.trace-call-detail-head span{display:block}.trace-call-detail-head strong{color:var(--pack-ink);font-size:12px}.trace-call-detail-head div span{margin-top:4px;color:var(--pack-faint);font-size:10px}.trace-call-badge{flex:0 0 auto;color:var(--pack-muted);font-size:9px;font-weight:700;letter-spacing:.08em}.trace-call-badge.is-streaming{color:var(--pack-blue)}.trace-call-badge.is-failed{color:var(--pack-orange)}.trace-response,.trace-json,.trace-prompt-block pre{max-height:260px;margin:0;overflow:auto;padding:14px;color:var(--pack-ink);background:color-mix(in srgb,var(--pack-surface-solid) 74%,transparent);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:10px;line-height:1.6;white-space:pre-wrap;overflow-wrap:anywhere}.trace-response{min-height:108px;max-height:290px}.trace-details{border-top:1px solid var(--pack-line)}.trace-details summary{padding:10px 13px;color:var(--pack-blue);cursor:pointer;font-size:10px;font-weight:650}.trace-prompt-stack{display:grid;gap:8px;padding:0 10px 10px}.trace-prompt-block{overflow:hidden;border:1px solid var(--pack-line);border-radius:9px}.trace-prompt-block>span{display:block;padding:7px 9px;color:var(--pack-faint);background:var(--pack-surface-solid);font-size:9px;font-weight:700;text-transform:uppercase}.trace-prompt-block pre{max-height:190px;padding:9px}.trace-inline-error{display:flex;align-items:flex-start;gap:7px;padding:10px 13px;color:var(--pack-orange);font-size:10px;line-height:1.45}.trace-inline-error svg{flex:0 0 auto;margin-top:1px}.trace-truncation-note{padding:8px 13px;color:var(--pack-orange);background:var(--pack-orange-soft);font-size:10px}.trace-empty{display:flex;align-items:center;justify-content:center;gap:8px;min-height:150px;color:var(--pack-faint);font-size:11px}.trace-log-count{color:var(--pack-faint);font-size:10px}.trace-log{max-height:245px;overflow:auto}.trace-log-row{display:grid;grid-template-columns:62px 74px minmax(0,1fr) auto;align-items:baseline;gap:8px;min-height:31px;padding:7px 0;border-bottom:1px solid color-mix(in srgb,var(--pack-line) 65%,transparent);font-size:10px}.trace-log-row:last-child{border-bottom:0}.trace-log-row time{color:var(--pack-faint);font-variant-numeric:tabular-nums}.trace-log-kind{color:var(--pack-faint);font-size:9px;text-transform:uppercase}.trace-log-message{min-width:0;overflow:hidden;color:var(--pack-muted);text-overflow:ellipsis;white-space:nowrap}.trace-log-row>strong{color:var(--pack-faint);font-size:9px;font-variant-numeric:tabular-nums}.trace-log-row.is-error .trace-log-message,.trace-log-row.is-error>strong{color:var(--pack-orange)}.trace-log-row.is-warn .trace-log-message{color:var(--pack-orange)}.trace-retry{display:flex;margin:18px auto 0}.trace-report{width:min(1080px,100%);margin:14px auto 0;padding:20px 22px;border:1px solid var(--pack-line);border-radius:18px;background:var(--pack-surface);box-shadow:0 12px 35px #0000000d}.trace-report-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.trace-report-heading h3{margin:5px 0 0;color:var(--pack-ink);font-size:19px;letter-spacing:-.035em}.trace-report-status{color:var(--pack-green);font-size:10px;font-weight:700}.trace-report-metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-top:16px}.trace-report-metrics div{padding:10px;border-radius:11px;background:var(--pack-bg)}.trace-report-metrics span,.trace-report-metrics strong{display:block}.trace-report-metrics span{color:var(--pack-faint);font-size:10px}.trace-report-metrics strong{margin-top:4px;color:var(--pack-ink);font-size:14px;font-variant-numeric:tabular-nums}.trace-report-calls{margin-top:15px;padding-top:13px;border-top:1px solid var(--pack-line);color:var(--pack-faint);font-size:10px}.trace-report-calls>div{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:8px;color:var(--pack-muted)}.trace-report-calls strong{color:var(--pack-ink);font-size:11px}.trace-report-calls small{color:var(--pack-faint);font-size:10px}@media(max-width:860px){.trace-layout{grid-template-columns:1fr}.trace-side{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start}}@media(max-width:620px){.pack-generating-card{padding:24px 16px}.trace-headline{flex-direction:column}.trace-transport{align-self:flex-start}.trace-side,.trace-call-layout{grid-template-columns:1fr}.trace-call-list{grid-template-columns:repeat(2,minmax(0,1fr))}.trace-log-row{grid-template-columns:54px minmax(0,1fr) auto}.trace-log-kind{display:none}.trace-report{padding:18px 16px}.trace-report-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:1199px){.app-shell>.pack-topbar{display:none}.pack-demo-page{min-height:100svh;padding:0;overflow:visible}.pack-demo-page:before,.pack-demo-noise{display:none}.mobile-pack-page{position:relative;min-height:100svh;padding:0 16px calc(92px + env(safe-area-inset-bottom));color:var(--pack-ink)}.mobile-topbar{position:sticky;z-index:30;top:0;display:flex;align-items:center;justify-content:space-between;min-height:calc(56px + env(safe-area-inset-top));padding:env(safe-area-inset-top) 0 0;border-bottom:1px solid var(--pack-line);background:color-mix(in srgb,var(--pack-bg) 84%,transparent);-webkit-backdrop-filter:blur(20px) saturate(150%);backdrop-filter:blur(20px) saturate(150%)}.mobile-topbar-leading,.mobile-brand,.mobile-topbar-stage,.mobile-network{display:inline-flex;align-items:center}.mobile-topbar-leading{gap:8px}.mobile-brand{gap:8px;font-size:15px;font-weight:700;letter-spacing:-.02em}.mobile-brand-mark{display:grid;place-items:center;width:28px;height:28px;border-radius:9px;color:#fff;background:var(--pack-ink);font-size:13px}.mobile-topbar-stage{gap:9px;color:var(--pack-muted);font-size:14px;font-weight:600}.mobile-network{justify-content:center;gap:3px;min-width:26px;height:26px;padding:0 6px;border-radius:50%}.mobile-network small{font-size:12px;font-weight:650}.mobile-network.is-online{color:var(--pack-green);background:var(--pack-green-soft)}.mobile-network.is-offline{color:var(--pack-orange);background:var(--pack-orange-soft)}.mobile-icon-button{display:inline-grid;place-items:center;width:44px;height:44px;padding:0;border:0;border-radius:50%;color:var(--pack-ink);background:transparent;cursor:pointer}.mobile-icon-button:focus-visible,.mobile-back-button:focus-visible,.mobile-button:focus-visible,.mobile-chapter-row:focus-visible,.mobile-option:focus-visible,.mobile-advanced-toggle:focus-visible{outline:3px solid color-mix(in srgb,var(--pack-blue) 35%,transparent);outline-offset:2px}.mobile-step-indicator{padding:16px 0 8px}.mobile-step-track,.mobile-question-progress{height:4px;overflow:hidden;border-radius:99px;background:color-mix(in srgb,var(--pack-line) 70%,transparent)}.mobile-step-track span,.mobile-question-progress span{display:block;height:100%;border-radius:inherit;background:var(--pack-blue);transition:width .22s var(--pack-ease-out)}.mobile-step-copy{display:flex;justify-content:space-between;gap:12px;margin-top:9px;color:var(--pack-faint);font-size:13px}.mobile-step-copy strong{color:var(--pack-ink);font-weight:650}.mobile-eyebrow{display:inline-flex;align-items:center;gap:6px;color:var(--pack-faint);font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.mobile-eyebrow:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--pack-blue)}.mobile-upload,.mobile-preview,.mobile-generating,.mobile-ready,.mobile-practice,.mobile-practice-complete{width:min(720px,100%);margin:0 auto;animation:pack-enter .28s var(--pack-ease-out) both}.mobile-upload{display:flex;flex-direction:column;min-height:calc(100svh - 110px);padding:clamp(50px,16vh,120px) 0 24px}.mobile-upload-icon{display:grid;place-items:center;width:58px;height:58px;margin-bottom:24px;border-radius:18px;color:var(--pack-blue);background:var(--pack-blue-soft)}.mobile-upload h1,.mobile-preview h1,.mobile-generating h1,.mobile-ready h1,.mobile-practice-complete h1{margin:12px 0 10px;color:var(--pack-ink);font-size:clamp(30px,8vw,48px);line-height:1.06;letter-spacing:-.055em}.mobile-upload>p,.mobile-preview-heading p,.mobile-generating-heading p,.mobile-ready>p,.mobile-practice-complete>p{max-width:550px;margin:0;color:var(--pack-muted);font-size:16px;line-height:1.6}.mobile-upload-actions{display:grid;gap:13px;margin-top:30px}.mobile-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:0 20px;border:0;border-radius:15px;color:#fff;background:var(--pack-blue);box-shadow:0 8px 18px #0071e333;cursor:pointer;font-size:16px;font-weight:700;transition:transform .16s var(--pack-ease-out),background .16s ease,box-shadow .16s var(--pack-ease-out)}.mobile-button:active{transform:scale(.98)}.mobile-button:disabled{cursor:not-allowed;opacity:.55}.mobile-button-secondary{color:var(--pack-ink);background:var(--pack-surface-solid);border:1px solid var(--pack-line);box-shadow:none}.mobile-button-quiet{color:var(--pack-blue);background:transparent;box-shadow:none}.mobile-link-button,.mobile-outline-button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:44px;padding:0 4px;border:0;color:var(--pack-blue);background:transparent;cursor:pointer;font-size:15px;font-weight:650}.mobile-link-button:disabled{opacity:.5}.mobile-upload-status{margin-top:20px!important;color:var(--pack-blue)!important;font-size:15px!important}.mobile-upload-hint{margin-top:auto!important;padding-top:36px;color:var(--pack-faint)!important;font-size:13px!important}.mobile-action-bar{position:fixed;z-index:25;right:0;bottom:0;left:0;padding:10px 16px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--pack-line);background:color-mix(in srgb,var(--pack-bg) 90%,transparent);-webkit-backdrop-filter:blur(18px) saturate(150%);backdrop-filter:blur(18px) saturate(150%)}.mobile-action-bar-inner{width:min(720px,100%);margin:0 auto}.mobile-action-bar .mobile-button{width:100%;min-height:52px}.mobile-error{display:flex;align-items:flex-start;gap:8px;margin-top:18px;padding:13px 14px;border-radius:12px;color:var(--pack-orange);background:var(--pack-orange-soft);font-size:15px;line-height:1.5}.mobile-preview{padding-bottom:24px}.mobile-preview-summary{margin-top:22px;padding:18px;border:1px solid var(--pack-line);border-radius:18px;background:var(--pack-surface-solid)}.mobile-file-row{display:flex;align-items:center;gap:12px;min-width:0}.mobile-file-icon{display:grid;flex:0 0 44px;place-items:center;width:44px;height:50px;border-radius:12px;color:var(--pack-blue);background:var(--pack-blue-soft)}.mobile-file-row strong,.mobile-file-row span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mobile-file-row strong{font-size:16px}.mobile-file-row span{margin-top:4px;color:var(--pack-muted);font-size:14px}.mobile-summary-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:18px;padding-top:15px;border-top:1px solid var(--pack-line)}.mobile-summary-stats div{min-width:0}.mobile-summary-stats strong,.mobile-summary-stats span{display:block}.mobile-summary-stats strong{font-size:24px;letter-spacing:-.05em}.mobile-summary-stats span{margin-top:3px;color:var(--pack-muted);font-size:13px}.mobile-muted{color:var(--pack-faint);font-size:13px;line-height:1.5}.mobile-preview-heading{margin:32px 0 20px}.mobile-chapter-list{display:grid;gap:9px}.mobile-chapter-row{display:flex;align-items:center;gap:12px;width:100%;min-height:76px;padding:13px 12px;border:1px solid var(--pack-line);border-radius:16px;color:var(--pack-ink);background:var(--pack-surface-solid);cursor:pointer;text-align:left}.mobile-chapter-row:active{transform:scale(.99)}.mobile-chapter-index{display:grid;flex:0 0 32px;place-items:center;width:32px;height:32px;border-radius:50%;color:var(--pack-blue);background:var(--pack-blue-soft);font-size:12px;font-weight:700}.mobile-chapter-content{min-width:0;flex:1}.mobile-chapter-content strong,.mobile-chapter-content span,.mobile-chapter-content small{display:block}.mobile-chapter-content strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:16px}.mobile-chapter-content span{margin-top:5px;color:var(--pack-muted);font-size:14px}.mobile-chapter-content small{margin-top:5px;color:var(--pack-orange);font-size:13px}.mobile-chapter-row>svg{flex:0 0 auto;color:var(--pack-faint)}.mobile-sheet-backdrop{position:fixed;z-index:100;inset:0;display:flex;align-items:flex-end;padding:0;background:#12121480;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.mobile-source-sheet{display:flex;flex-direction:column;width:100%;max-height:min(86svh,760px);overflow:hidden;border-radius:24px 24px 0 0;background:var(--pack-surface-solid);box-shadow:0 -12px 50px #0003;animation:pack-enter .24s var(--pack-ease-out) both}.mobile-sheet-header{display:flex;align-items:flex-start;justify-content:space-between;gap:15px;padding:21px 18px 16px;border-bottom:1px solid var(--pack-line)}.mobile-sheet-header h2{margin:8px 0 4px;font-size:23px;letter-spacing:-.045em}.mobile-sheet-header p{margin:0;color:var(--pack-muted);font-size:14px}.mobile-source-pdf{height:34svh;padding:12px 16px 0;background:var(--pack-bg)}.mobile-source-pdf iframe{display:block;width:100%;height:100%;border:1px solid var(--pack-line);border-radius:12px;background:#fff}.mobile-pdf-load{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;margin:14px 16px 0;border:1px solid var(--pack-line);border-radius:13px;color:var(--pack-blue);background:var(--pack-blue-soft);cursor:pointer;font-size:15px;font-weight:650}.mobile-source-body{min-height:90px;overflow:auto;padding:8px 18px 20px}.mobile-source-status{display:flex;align-items:center;justify-content:center;gap:8px;min-height:110px;color:var(--pack-muted);font-size:15px}.mobile-source-page{padding:14px 0 16px;border-bottom:1px solid var(--pack-line)}.mobile-source-page>div{display:flex;align-items:center;gap:8px}.mobile-source-page>div span{padding:3px 7px;border-radius:99px;color:var(--pack-faint);background:var(--pack-bg);font-size:12px}.mobile-source-page p{margin:9px 0 0;color:var(--pack-muted);font-size:15px;line-height:1.7;white-space:pre-wrap}.mobile-source-page mark{border-radius:3px;background:#ffd60a73}.mobile-sheet-note{display:flex;gap:7px;padding:12px 18px calc(15px + env(safe-area-inset-bottom));border-top:1px solid var(--pack-line);color:var(--pack-faint);font-size:13px;line-height:1.5}.mobile-generating{padding:29px 0 24px}.mobile-generating-file{display:flex;align-items:center;gap:8px;color:var(--pack-muted);font-size:15px}.mobile-generating-file span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mobile-generating-heading{margin-top:32px}.mobile-transport{display:inline-flex;align-items:center;gap:7px;margin-top:18px;padding:8px 11px;border-radius:99px;color:var(--pack-green);background:var(--pack-green-soft);font-size:14px;font-weight:650}.mobile-progress-wrap{display:flex;align-items:center;gap:12px;margin-top:28px}.mobile-progress{flex:1;height:8px;overflow:hidden;border-radius:99px;background:color-mix(in srgb,var(--pack-line) 75%,transparent)}.mobile-progress span{display:block;height:100%;border-radius:inherit;background:var(--pack-blue);transition:width .22s var(--pack-ease-out)}.mobile-progress-wrap strong{min-width:46px;color:var(--pack-ink);font-size:16px;text-align:right}.mobile-advanced{margin-top:27px;border-top:1px solid var(--pack-line);border-bottom:1px solid var(--pack-line)}.mobile-advanced-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;min-height:56px;padding:0;border:0;color:var(--pack-ink);background:transparent;cursor:pointer;text-align:left}.mobile-advanced-toggle>span{display:inline-flex;align-items:center;gap:7px;font-size:15px;font-weight:650}.mobile-advanced-toggle>span svg{transition:transform .16s var(--pack-ease-out)}.mobile-advanced.is-open .mobile-advanced-toggle>span svg{transform:rotate(180deg)}.mobile-advanced-toggle small{color:var(--pack-faint);font-size:13px}.mobile-advanced-content{padding:0 0 18px}.mobile-detail-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.mobile-detail-grid>div{display:grid;grid-template-columns:auto 1fr;gap:3px 7px;padding:11px;border-radius:12px;background:var(--pack-bg)}.mobile-detail-grid svg{grid-row:span 2;color:var(--pack-blue)}.mobile-detail-grid span{color:var(--pack-faint);font-size:12px}.mobile-detail-grid strong{font-size:15px}.mobile-detail-error{margin:12px 0 0;color:var(--pack-orange);font-size:14px}.mobile-detail-block{margin-top:12px;border:1px solid var(--pack-line);border-radius:12px;overflow:hidden}.mobile-detail-block summary{padding:11px 12px;color:var(--pack-blue);cursor:pointer;font-size:14px;font-weight:650}.mobile-detail-block p{padding:0 12px;color:var(--pack-muted);font-size:14px}.mobile-detail-block pre{max-height:240px;margin:0;overflow:auto;padding:12px;color:var(--pack-muted);background:var(--pack-bg);font:13px/1.55 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;white-space:pre-wrap;overflow-wrap:anywhere}.mobile-detail-block ol{max-height:200px;overflow:auto;margin:0;padding:0 12px 12px 31px;color:var(--pack-muted);font-size:13px;line-height:1.6}.mobile-ready{padding:50px 0 24px}.mobile-ready-mark{display:grid;place-items:center;width:64px;height:64px;border-radius:50%;color:#fff;background:var(--pack-green);box-shadow:0 10px 22px #248a3d33}.mobile-ready .mobile-eyebrow{margin-top:25px}.mobile-ready-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin:30px 0 22px}.mobile-ready-stats div{padding:15px 10px;border-radius:15px;background:var(--pack-surface-solid);text-align:center}.mobile-ready-stats strong,.mobile-ready-stats span{display:block}.mobile-ready-stats strong{font-size:27px;letter-spacing:-.05em}.mobile-ready-stats span{margin-top:4px;color:var(--pack-muted);font-size:13px}.mobile-outline-button{padding:0 14px;border:1px solid var(--pack-line);border-radius:12px;background:var(--pack-surface-solid)}.mobile-ready-error{margin:16px 0 0;color:var(--pack-orange);font-size:14px;line-height:1.5}.mobile-practice{padding:15px 0 24px}.mobile-practice-top{display:flex;align-items:center;justify-content:space-between;gap:10px}.mobile-back-button{display:inline-flex;align-items:center;gap:5px;min-height:44px;padding:0;border:0;color:var(--pack-ink);background:transparent;cursor:pointer;font-size:15px;font-weight:650}.mobile-practice-top>span{color:var(--pack-muted);font-size:14px;font-weight:650}.mobile-question-progress{margin:10px 0 28px}.mobile-practice-actions{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:10px}.mobile-practice-actions .mobile-button{width:100%;min-width:0;padding-inline:10px;font-size:15px}.mobile-question-meta{display:flex;flex-wrap:wrap;gap:7px;color:var(--pack-blue);font-size:13px;font-weight:650}.mobile-question-meta span{display:inline-flex;align-items:center;gap:5px;padding:6px 9px;border-radius:99px;background:var(--pack-blue-soft)}.mobile-practice h1{margin:20px 0 25px;color:var(--pack-ink);font-size:clamp(22px,6vw,30px);line-height:1.4;letter-spacing:-.035em}.mobile-options{display:grid;gap:10px}.mobile-option{display:flex;align-items:center;gap:12px;width:100%;min-height:64px;padding:12px 14px;border:1px solid var(--pack-line);border-radius:15px;color:var(--pack-ink);background:var(--pack-surface-solid);cursor:pointer;text-align:left}.mobile-option>span{display:grid;flex:0 0 32px;place-items:center;width:32px;height:32px;border:1px solid var(--pack-line);border-radius:50%;color:var(--pack-muted);font-size:14px;font-weight:700}.mobile-option strong{flex:1;font-size:16px;line-height:1.45}.mobile-option.is-selected{border-color:var(--pack-blue);background:var(--pack-blue-soft)}.mobile-option.is-correct{border-color:var(--pack-green);background:var(--pack-green-soft)}.mobile-option.is-wrong{border-color:var(--pack-orange);background:var(--pack-orange-soft)}.mobile-fill textarea{display:block;width:100%;min-height:112px;padding:14px;border:1px solid var(--pack-line);border-radius:15px;outline:0;resize:vertical;color:var(--pack-ink);background:var(--pack-surface-solid);font-size:17px;line-height:1.55}.mobile-fill textarea:focus{border-color:var(--pack-blue);box-shadow:0 0 0 3px var(--pack-blue-soft)}.mobile-fill>span{display:block;margin:7px 0 11px;color:var(--pack-faint);font-size:13px}.mobile-fill .mobile-button{width:100%}.mobile-answer{margin-top:22px;padding:16px;border-left:3px solid var(--pack-green);border-radius:12px;background:var(--pack-green-soft)}.mobile-answer.is-wrong{border-left-color:var(--pack-orange);background:var(--pack-orange-soft)}.mobile-answer strong{font-size:16px}.mobile-answer p{margin:8px 0 11px;color:var(--pack-muted);font-size:15px;line-height:1.6}.mobile-answer>span{display:flex;gap:6px;color:var(--pack-faint);font-size:13px;line-height:1.5}.mobile-practice-count{margin:18px 0 0;color:var(--pack-faint);font-size:13px;text-align:center}.mobile-practice-complete{display:flex;flex-direction:column;align-items:flex-start;min-height:calc(100svh - 120px);padding:72px 0 24px;color:var(--pack-green)}.mobile-practice-complete .mobile-eyebrow{margin-top:24px}.mobile-practice-complete h1{margin-bottom:12px}.mobile-practice-complete .mobile-button{width:100%;margin-top:30px}.mobile-practice-complete .mobile-button+.mobile-button{margin-top:10px}.mobile-practice-complete .mobile-link-button{margin:10px auto 0}}@media(min-width:768px)and (max-width:1199px){.mobile-pack-page{padding-inline:28px}.mobile-preview{width:min(1020px,100%)}.mobile-preview .mobile-chapter-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.mobile-preview-summary{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(300px,.7fr);align-items:center;gap:18px}.mobile-summary-stats{margin-top:0;padding:0;border-top:0}.mobile-generating,.mobile-ready,.mobile-practice{width:min(720px,100%)}.mobile-generating{display:grid;grid-template-columns:1fr 220px;column-gap:32px}.mobile-generating-file,.mobile-generating-heading,.mobile-generating>.mobile-error,.mobile-generating>.mobile-advanced,.mobile-generating>.mobile-action-bar{grid-column:1 / -1}.mobile-generating-heading{grid-column:1}.mobile-transport{grid-column:2;grid-row:2;align-self:end;justify-self:end}.mobile-progress-wrap{grid-column:1 / -1}.mobile-sheet-backdrop{align-items:center;padding:24px}.mobile-source-sheet{width:min(680px,100%);max-height:min(86svh,760px);border-radius:24px}}@media(min-width:900px)and (max-width:1199px)and (orientation:landscape){.mobile-preview{display:grid;grid-template-columns:minmax(280px,.72fr) minmax(0,1.28fr);align-items:start;gap:28px}.mobile-preview-summary{grid-column:1;display:block;margin-top:22px}.mobile-preview-heading{grid-column:2;margin-top:22px}.mobile-preview .mobile-chapter-list{grid-column:2;grid-template-columns:1fr}}@media(orientation:landscape)and (max-width:767px){.mobile-upload{min-height:auto;padding-top:30px}.mobile-upload-hint{margin-top:30px!important}}@media(prefers-reduced-motion:reduce){.mobile-pack-page *,.mobile-pack-page *:before,.mobile-pack-page *:after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}@media(prefers-reduced-transparency:reduce){.mobile-topbar,.mobile-action-bar{-webkit-backdrop-filter:none;backdrop-filter:none;background:var(--pack-surface-solid)}.mobile-sheet-backdrop{-webkit-backdrop-filter:none;backdrop-filter:none;background:color-mix(in srgb,var(--pack-ink) 42%,transparent)}}@media(prefers-contrast:more){.mobile-chapter-row,.mobile-option,.mobile-preview-summary,.mobile-ready-stats div,.mobile-source-sheet{border-color:currentColor}.mobile-button{box-shadow:none}}@media(prefers-color-scheme:dark){.mobile-pdf-load{color:#9ac7ff}.mobile-source-pdf iframe{background:#fff}}:root{--v2-ink: #18181b;--v2-muted: #71717a;--v2-faint: #a1a1aa;--v2-line: #e4e4e7;--v2-bg: #f7f7f8;--v2-surface: #fff;--v2-blue: #2563eb;--v2-blue-soft: #eff6ff;--v2-green: #15803d;--v2-green-soft: #ecfdf3;--v2-orange: #c2410c;--v2-shadow: 0 18px 55px rgba(24, 24, 27, .08)}.v2-app{min-height:100vh;display:grid;grid-template-columns:236px 1fr;background:var(--v2-bg);color:var(--v2-ink)}.v2-side{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;padding:25px 17px;border-right:1px solid var(--v2-line);background:#ffffffc2;-webkit-backdrop-filter:blur(24px);backdrop-filter:blur(24px)}.v2-brand{display:flex;align-items:center;gap:10px;margin:0 12px 42px;padding:0;border:0;color:var(--v2-ink);background:none;font-size:17px;cursor:pointer}.v2-brand span{display:grid;place-items:center;width:29px;height:29px;border-radius:10px;color:#fff;background:#18181b;font-weight:750}.v2-side-label,.v2-eyebrow{color:var(--v2-faint);font-size:10px;font-weight:750;letter-spacing:.12em;text-transform:uppercase}.v2-side-label{margin:0 12px 12px}.v2-side nav{display:grid;gap:4px}.v2-side nav a,.v2-side-bottom a,.v2-side-bottom button{display:flex;align-items:center;gap:11px;padding:11px 12px;border:0;border-radius:11px;color:var(--v2-muted);background:transparent;font-size:13px;text-decoration:none;cursor:pointer}.v2-side nav a:hover,.v2-side nav a.active,.v2-side-bottom a:hover{color:var(--v2-ink);background:#f0f0f2}.v2-side-bottom{display:grid;gap:5px;margin-top:auto;border-top:1px solid var(--v2-line);padding-top:14px}.v2-side-bottom button{width:100%;text-align:left}.v2-main{width:min(1050px,100%);margin:0 auto;padding:38px clamp(20px,5vw,70px) 80px}.v2-topbar{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:31px}.v2-topbar h2{margin:7px 0 0;font-size:29px;letter-spacing:-.045em}.v2-hero-card{display:flex;justify-content:space-between;min-height:255px;padding:38px 44px;border:1px solid #dbeafe;border-radius:25px;background:linear-gradient(132deg,#fff,#f0f7ff);box-shadow:var(--v2-shadow)}.v2-hero-card h1,.v2-compile-card h1,.v2-upload-panel h1,.v2-material-head h1,.v2-share h1{max-width:630px;margin:13px 0 10px;font-size:clamp(30px,4vw,49px);letter-spacing:-.06em;line-height:1.05}.v2-hero-card p,.v2-compile-card p,.v2-upload-panel p,.v2-material-head p,.v2-share>p{color:var(--v2-muted);line-height:1.65}.v2-hero-orbit{align-self:center;display:grid;place-items:center;width:145px;height:145px;border:1px solid #bfdbfe;border-radius:50%;color:var(--v2-blue);background:#ffffffb3}.v2-hero-orbit strong{margin-top:-10px;color:var(--v2-ink);font-size:38px;letter-spacing:-.06em}.v2-hero-orbit span{margin-top:-16px;color:var(--v2-muted);font-size:12px}.v2-primary,.v2-secondary,.v2-icon-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:11px;border:1px solid transparent;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease,background .15s ease}.v2-primary{padding:12px 17px;color:#fff;background:var(--v2-blue);box-shadow:0 7px 17px #2563eb33;font-size:13px;font-weight:650}.v2-primary:hover{transform:translateY(-1px);box-shadow:0 10px 22px #2563eb40}.v2-primary:disabled{opacity:.45;cursor:not-allowed;transform:none}.v2-primary.small{padding:9px 13px;font-size:12px}.v2-secondary{padding:10px 14px;border-color:var(--v2-line);color:var(--v2-muted);background:#fff;font-size:12px;font-weight:600}.v2-secondary:hover{color:var(--v2-ink);border-color:#c4c4c8;background:#fafafa}.v2-secondary.compact{padding:8px 11px;white-space:nowrap}.v2-icon-button{width:36px;height:36px;border-color:var(--v2-line);color:var(--v2-muted);background:#fff}.v2-stat-grid,.v2-admin-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}.v2-stat-grid>div{display:grid;grid-template-columns:22px 1fr;column-gap:9px;padding:17px 18px;border:1px solid var(--v2-line);border-radius:15px;background:#fff}.v2-stat-grid svg{grid-row:span 2;color:var(--v2-blue)}.v2-stat-grid strong{font-size:19px;letter-spacing:-.035em}.v2-stat-grid span{color:var(--v2-muted);font-size:11px}.v2-section-head,.v2-card-review-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin:44px 0 15px}.v2-section-head h3,.v2-card-review-head h3{margin:7px 0 0;font-size:20px;letter-spacing:-.04em}.v2-section-head a{display:flex;align-items:center;gap:5px;color:var(--v2-blue);font-size:12px;text-decoration:none}.v2-material-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.v2-material-tile,.v2-add-tile,.v2-empty-tile{min-height:142px;display:flex;flex-direction:column;align-items:flex-start;gap:7px;padding:19px;border:1px solid var(--v2-line);border-radius:16px;color:var(--v2-ink);background:#fff;text-align:left;cursor:pointer}.v2-material-tile:hover,.v2-add-tile:hover,.v2-empty-tile:hover{border-color:#bfdbfe;box-shadow:0 8px 24px #2563eb14}.v2-material-tile svg,.v2-add-tile svg,.v2-empty-tile svg{color:var(--v2-blue)}.v2-material-tile strong,.v2-add-tile strong,.v2-empty-tile strong{margin-top:auto;font-size:14px}.v2-material-tile span,.v2-material-tile small,.v2-add-tile,.v2-empty-tile span{color:var(--v2-muted);font-size:11px}.v2-add-tile{align-items:center;justify-content:center;color:var(--v2-blue);background:var(--v2-blue-soft);text-align:center}.v2-auth{min-height:100vh;display:grid;justify-items:center;align-content:center;gap:15px;padding:30px;background:radial-gradient(circle at 75% 10%,#dbeafe,transparent 36%),var(--v2-bg);text-align:center}.v2-auth-mark{display:grid;place-items:center;width:45px;height:45px;border-radius:15px;color:#fff;background:#18181b;font-size:20px;font-weight:750}.v2-auth h1{margin:4px 0;font-size:clamp(38px,7vw,70px);line-height:1.02;letter-spacing:-.075em}.v2-auth h1 em{color:var(--v2-blue);font-style:normal}.v2-auth>p{max-width:440px;margin:0 0 10px;color:var(--v2-muted);line-height:1.6}.v2-auth-card{width:min(390px,100%);display:grid;gap:10px;padding:19px;border:1px solid var(--v2-line);border-radius:18px;background:#ffffffd1;box-shadow:var(--v2-shadow)}.v2-auth-card input,.v2-toolbar input{width:100%;padding:12px 13px;border:1px solid var(--v2-line);border-radius:10px;outline:0;background:#fff;font-size:13px}.v2-auth-card input:focus,.v2-toolbar input:focus{border-color:#93c5fd;box-shadow:0 0 0 3px #dbeafe}.v2-tabs{display:grid;grid-template-columns:1fr 1fr;gap:4px;margin-bottom:4px;padding:4px;border-radius:10px;background:#f4f4f5}.v2-tabs button{padding:9px;border:0;border-radius:8px;color:var(--v2-muted);background:none;font-size:12px;cursor:pointer}.v2-tabs button.active{color:var(--v2-ink);background:#fff;box-shadow:0 1px 4px #00000014}.v2-auth small{color:var(--v2-faint);font-size:11px}.v2-error{margin:15px 0;padding:12px 14px;border:1px solid #fecaca;border-radius:11px;color:#b91c1c;background:#fff1f2;font-size:12px}.v2-loading{display:grid;place-items:center;min-height:40vh;color:var(--v2-muted);font-size:13px}.v2-upload-panel,.v2-compile-card,.v2-chart-card,.v2-profile-card{padding:38px;border:1px solid var(--v2-line);border-radius:23px;background:#fff;box-shadow:var(--v2-shadow)}.v2-upload-panel{display:grid;justify-items:center;text-align:center}.v2-upload-icon,.v2-success-mark{display:grid;place-items:center;width:56px;height:56px;border-radius:17px;color:var(--v2-blue);background:var(--v2-blue-soft)}.v2-success-mark{color:var(--v2-green);background:var(--v2-green-soft)}.v2-dropzone{width:min(620px,100%);min-height:170px;display:grid;place-content:center;justify-items:center;gap:9px;margin:18px 0;padding:25px;border:1px dashed #93c5fd;border-radius:16px;color:var(--v2-muted);background:#f8fbff;cursor:pointer}.v2-dropzone input{display:none}.v2-dropzone strong{color:var(--v2-ink);font-size:14px}.v2-dropzone span{font-size:11px}.v2-chapter-list{display:grid;gap:7px;margin:25px 0}.v2-chapter-list>div{display:flex;justify-content:space-between;gap:15px;padding:13px 15px;border:1px solid var(--v2-line);border-radius:11px;font-size:12px}.v2-chapter-list span{color:var(--v2-muted)}.v2-actions{display:flex;flex-wrap:wrap;gap:9px;align-items:center}.v2-toolbar{display:flex;align-items:center;gap:12px;margin-bottom:15px}.v2-toolbar input{max-width:420px}.v2-toolbar span,.v2-card-review-head>span{color:var(--v2-muted);font-size:12px}.v2-library-list,.v2-card-list,.v2-table,.v2-timeline,.v2-setting-list{display:grid;gap:9px}.v2-library-row{display:grid;grid-template-columns:43px 1fr auto 17px;align-items:center;gap:13px;padding:14px;border:1px solid var(--v2-line);border-radius:15px;color:var(--v2-ink);background:#fff;text-align:left;cursor:pointer}.v2-library-row:hover{border-color:#bfdbfe}.v2-file-badge{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;color:var(--v2-blue);background:var(--v2-blue-soft)}.v2-library-row>div:nth-child(2){display:grid;gap:5px}.v2-library-row span,.v2-row-meta small{color:var(--v2-muted);font-size:11px}.v2-row-meta{display:grid;justify-items:end;gap:5px}.v2-row-meta b{color:var(--v2-green);font-size:11px;font-weight:600}.v2-material-head{display:flex;justify-content:space-between;gap:25px;align-items:end;padding-bottom:27px;border-bottom:1px solid var(--v2-line)}.v2-material-head h1{font-size:30px}.v2-card-row{display:grid;grid-template-columns:68px 1fr auto;align-items:center;gap:15px;padding:16px;border:1px solid var(--v2-line);border-radius:14px;background:#fff}.v2-card-row.draft{background:#fffdf8}.v2-card-type{color:var(--v2-blue);font-size:10px;font-weight:750;letter-spacing:.08em;text-transform:uppercase}.v2-card-copy{display:grid;gap:6px;min-width:0}.v2-card-copy strong{font-size:13px;line-height:1.45}.v2-card-copy p{margin:0;color:var(--v2-muted);font-size:12px;line-height:1.5}.v2-card-copy small{overflow:hidden;color:var(--v2-faint);font-size:10px;text-overflow:ellipsis;white-space:nowrap}.v2-pill{display:inline-flex;align-items:center;gap:4px;padding:6px 9px;border-radius:999px;font-size:10px}.v2-pill.success{color:var(--v2-green);background:var(--v2-green-soft)}.v2-study{width:min(700px,100%);margin:0 auto}.v2-study-top{display:flex;align-items:center;gap:14px;margin-bottom:28px;color:var(--v2-muted);font-size:12px}.v2-study-progress{flex:1;height:5px;overflow:hidden;border-radius:9px;background:#e4e4e7}.v2-study-progress i{display:block;height:100%;border-radius:inherit;background:var(--v2-blue);transition:width .25s ease}.v2-flashcard{min-height:510px;display:flex;flex-direction:column;align-items:center;padding:55px 42px 35px;border:1px solid #bfdbfe;border-radius:27px;background:linear-gradient(145deg,#fff,#f8fbff);box-shadow:var(--v2-shadow);text-align:center}.v2-flashcard h1{max-width:560px;margin:42px 0;font-size:clamp(25px,4vw,39px);line-height:1.35;letter-spacing:-.055em}.v2-primary.reveal{margin-top:auto;min-width:180px}.v2-primary.reveal span{opacity:.7;margin-left:15px;font-size:10px}.v2-answer{width:100%;margin:auto 0 20px;padding:20px;border:1px solid #bfdbfe;border-radius:15px;text-align:left;background:#fff}.v2-answer span{color:var(--v2-blue);font-size:10px;font-weight:750;letter-spacing:.1em}.v2-answer strong{display:block;margin:9px 0;font-size:18px;line-height:1.5}.v2-answer p{margin:0 0 10px;color:var(--v2-muted);font-size:12px;line-height:1.55}.v2-source-note{display:inline-flex;align-items:center;gap:5px;padding:0;border:0;color:var(--v2-blue);background:none;font-size:11px;cursor:pointer}.v2-tutor-button{display:inline-flex;align-items:center;gap:6px;margin:4px 0 11px;padding:8px 10px;border:1px solid #bfdbfe;border-radius:9px;color:var(--v2-blue);background:var(--v2-blue-soft);font-size:11px;cursor:pointer}.v2-tutor-button:disabled{opacity:.55;cursor:wait}.v2-tutor-result{margin:0 0 12px;padding:11px 12px;border-left:3px solid #60a5fa;color:var(--v2-muted);background:#f8fbff;font-size:11px;line-height:1.55}.v2-tutor-result strong{display:block;margin-bottom:5px;color:var(--v2-ink);font-size:12px}.v2-tutor-result p{margin:3px 0}.v2-report-form{display:grid;gap:8px;margin:12px 0}.v2-report-form textarea{min-height:84px;padding:10px;border:1px solid var(--v2-line);border-radius:9px;resize:vertical}.v2-notice{margin:12px 0;padding:12px 14px;border-radius:11px;color:var(--v2-green);background:var(--v2-green-soft);font-size:12px}.v2-rating button:disabled{opacity:.5;cursor:wait}.v2-rating{width:100%;margin-top:auto}.v2-rating>span{color:var(--v2-muted);font-size:11px}.v2-rating>div{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;margin-top:11px}.v2-rating button{display:grid;gap:4px;padding:10px 5px;border:1px solid var(--v2-line);border-radius:10px;color:var(--v2-ink);background:#fff;cursor:pointer}.v2-rating button:hover{border-color:#93c5fd;background:var(--v2-blue-soft)}.v2-rating b{font-size:11px}.v2-rating small{color:var(--v2-muted);font-size:9px}.v2-insight-banner{display:flex;align-items:center;gap:13px;margin-bottom:16px;padding:19px;border-radius:15px;color:var(--v2-blue);background:var(--v2-blue-soft)}.v2-insight-banner div{display:grid;gap:5px}.v2-insight-banner span{color:var(--v2-muted);font-size:11px}.v2-empty{display:grid;justify-items:center;gap:8px;padding:55px 20px;border:1px dashed var(--v2-line);border-radius:15px;color:var(--v2-green);text-align:center}.v2-empty strong{color:var(--v2-ink)}.v2-empty span{color:var(--v2-muted);font-size:11px}.v2-chart-card{margin-top:17px}.v2-chart-card h3{margin:8px 0;font-size:21px}.v2-chart-card p{color:var(--v2-muted);font-size:12px}.v2-bars{height:190px;display:flex;align-items:end;gap:8px;margin-top:30px;padding:0 10px;border-bottom:1px solid var(--v2-line)}.v2-bars>div{position:relative;flex:1;height:100%;display:flex;align-items:end;justify-content:center}.v2-bars i{display:block;width:100%;max-width:32px;border-radius:7px 7px 0 0;background:linear-gradient(#60a5fa,#2563eb)}.v2-bars small{position:absolute;bottom:-21px;color:var(--v2-faint);font-size:9px}.v2-table{margin-top:25px}.v2-table>div{display:flex;justify-content:space-between;gap:15px;padding:12px 15px;border-bottom:1px solid var(--v2-line)}.v2-table strong{overflow:hidden;font-size:12px;text-overflow:ellipsis;white-space:nowrap}.v2-table span{color:var(--v2-muted);font-size:11px;white-space:nowrap}.v2-timeline>div{display:flex;align-items:center;gap:13px;padding:13px 0;border-bottom:1px solid var(--v2-line)}.v2-timeline>div>span{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;color:var(--v2-blue);background:var(--v2-blue-soft)}.v2-timeline>div>div{display:grid;gap:4px}.v2-timeline small{color:var(--v2-muted);font-size:11px}.v2-profile-card{display:flex;align-items:center;gap:17px}.v2-profile-card h1{margin:4px 0;font-size:22px}.v2-profile-card p{margin:0;color:var(--v2-muted);font-size:12px}.v2-avatar{display:grid;place-items:center;width:54px;height:54px;border-radius:17px;color:#fff;background:var(--v2-blue);font-size:22px;font-weight:700}.v2-profile-card button{margin-left:auto}.v2-setting-list{margin-top:17px}.v2-setting-list>div{display:flex;align-items:center;gap:13px;padding:17px;border:1px solid var(--v2-line);border-radius:13px;background:#fff}.v2-setting-list>div>div{display:grid;gap:5px;flex:1}.v2-setting-list span{color:var(--v2-muted);font-size:11px}.v2-admin-grid{grid-template-columns:repeat(5,1fr)}.v2-admin-grid>div{display:grid;gap:9px;padding:16px;border:1px solid var(--v2-line);border-radius:13px;background:#fff}.v2-admin-grid span{color:var(--v2-muted);font-size:11px}.v2-admin-grid strong{font-size:23px}.v2-share{width:min(760px,100%);margin:0 auto;padding:45px 20px}.v2-share .v2-card-list{margin:30px 0}@media(max-width:800px){.v2-app{display:block}.v2-side{position:fixed;z-index:30;bottom:0;top:auto;width:100%;height:63px;display:block;padding:6px 8px;border-top:1px solid var(--v2-line);border-right:0}.v2-brand,.v2-side-label,.v2-side-bottom{display:none}.v2-side nav{height:100%;display:flex;justify-content:space-around;gap:2px}.v2-side nav a{flex:1;display:flex;flex-direction:column;justify-content:center;gap:3px;padding:4px 1px;font-size:9px}.v2-main{padding:23px 15px 93px}.v2-topbar{margin-bottom:22px}.v2-topbar h2{font-size:24px}.v2-hero-card{min-height:270px;display:block;padding:27px 24px}.v2-hero-card h1{font-size:32px}.v2-hero-orbit{width:91px;height:91px;margin-top:23px}.v2-hero-orbit strong{font-size:25px}.v2-stat-grid{gap:7px}.v2-stat-grid>div{display:block;padding:12px 9px}.v2-stat-grid svg{display:block;margin-bottom:8px}.v2-stat-grid strong{display:block;font-size:15px}.v2-stat-grid span{font-size:9px}.v2-material-grid{grid-template-columns:repeat(2,1fr)}.v2-material-tile,.v2-add-tile,.v2-empty-tile{min-height:125px;padding:14px}.v2-library-row{grid-template-columns:35px 1fr 17px;padding:12px 9px;gap:8px}.v2-row-meta{display:none}.v2-material-head{display:block}.v2-material-head h1{font-size:23px}.v2-material-head .v2-actions{margin-top:16px}.v2-card-row{grid-template-columns:45px 1fr;gap:9px;padding:13px}.v2-card-row>button,.v2-card-row>.v2-pill{grid-column:2;justify-self:start}.v2-flashcard{min-height:560px;padding:40px 20px 24px}.v2-flashcard h1{margin:50px 0;font-size:26px}.v2-rating>div{gap:4px}.v2-rating b{font-size:10px}.v2-rating small{font-size:8px}.v2-upload-panel,.v2-compile-card,.v2-chart-card,.v2-profile-card{padding:25px 18px}.v2-chapter-list>div{display:grid;gap:5px}.v2-profile-card{align-items:flex-start;flex-wrap:wrap}.v2-profile-card button{margin-left:0}.v2-admin-grid{grid-template-columns:repeat(2,1fr)}}.v2-material-tabs{display:flex;gap:8px;margin-top:24px;border-bottom:1px solid var(--v2-line)}.v2-material-tabs button{display:flex;align-items:center;gap:6px;border:0;padding:12px 15px;border-bottom:2px solid transparent;color:var(--v2-muted);background:none;cursor:pointer}.v2-material-tabs button.active{border-bottom-color:var(--v2-blue);color:var(--v2-blue)}.v2-toolbar select{padding:10px;border:1px solid var(--v2-line);border-radius:9px;background:var(--v2-surface)}.v2-card-actions{display:flex;align-items:center;gap:6px}.v2-card-type small{display:block;margin-top:5px;color:var(--v2-faint)}.v2-card-copy details{color:var(--v2-muted);font-size:11px}.v2-card-copy summary{cursor:pointer}.v2-card-copy blockquote,.v2-editor blockquote{margin:10px 0;padding:10px 13px;border-left:2px solid #93c5fd;background:var(--v2-blue-soft);line-height:1.6}.v2-notice a{display:inline-flex;margin-left:12px;color:var(--v2-blue)}.v2-notice input{display:block;margin-top:10px;width:100%;padding:9px;border:1px solid var(--v2-line);border-radius:8px;background:#fff}.v2-job-status{display:grid;gap:10px;margin-top:16px;padding:13px;background:var(--v2-blue-soft);border-radius:12px}.v2-job-status strong{font-size:12px;overflow-wrap:anywhere}.v2-job-status span{color:var(--v2-muted);font-size:11px}.v2-knowledge-map ul{list-style:none;padding:0}.v2-knowledge-map li{display:grid;gap:5px;padding:10px 0;border-bottom:1px solid var(--v2-line)}.v2-knowledge-map li strong{font-size:12px;font-weight:500}.v2-knowledge-map li small{color:var(--v2-muted)}.v2-source-reader{margin-top:20px}.v2-source-reader article{margin-top:15px;padding:20px;background:#fff;border:1px solid var(--v2-line);border-radius:14px}.v2-source-reader p{white-space:pre-wrap;font-size:13px;line-height:1.8;color:var(--v2-muted)}.v2-modal-backdrop{position:fixed;inset:0;z-index:80;display:grid;place-items:center;padding:20px;background:#0f172a5c;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.v2-editor{width:min(580px,100%);max-height:90vh;overflow:auto;padding:24px;border-radius:20px;background:#fff;box-shadow:var(--v2-shadow)}.v2-editor header{display:flex;justify-content:space-between;align-items:center}.v2-editor label{display:grid;gap:7px;margin:13px 0;font-size:12px;color:var(--v2-muted)}.v2-editor textarea{min-height:80px;padding:10px;border:1px solid var(--v2-line);border-radius:10px;resize:vertical;color:var(--v2-ink)}.v2-editor blockquote{font-size:11px;color:var(--v2-muted)}@media(max-width:800px){.v2-card-actions{grid-column:2;justify-content:flex-start}.v2-card-review-head{align-items:flex-start;flex-direction:column}.v2-material-tabs button{flex:1;justify-content:center;font-size:12px;padding:12px 5px}.v2-editor{padding:17px}.v2-toolbar{flex-wrap:wrap}}.v2-admin-tabs{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 20px}.v2-admin-tabs button{padding:9px 14px;border:1px solid var(--v2-line);border-radius:9px;color:var(--v2-muted);background:#fff;cursor:pointer}.v2-admin-tabs button.active{color:#fff;background:var(--v2-blue);border-color:var(--v2-blue)}.v2-admin-table{overflow:auto;border:1px solid var(--v2-line);border-radius:12px;background:#fff}.v2-admin-table-head,.v2-admin-table-row{min-width:800px;display:grid;grid-template-columns:1.2fr 1fr .8fr 1.6fr;gap:15px;align-items:center;padding:13px 16px;border-bottom:1px solid var(--v2-line);font-size:12px}.v2-admin-table-head{color:var(--v2-muted);background:#fafafa}.v2-admin-table-row>div:first-child{display:grid;gap:5px}.v2-admin-table-row small{color:var(--v2-muted)}.v2-inline-name{width:100px;padding:7px;border:1px solid var(--v2-line);border-radius:6px}.v2-review-item{padding:20px;border:1px solid var(--v2-line);border-radius:14px;background:#fff}.v2-review-item h3{font-size:16px}.v2-review-item .v2-section-head{margin:0 0 15px;font-size:11px;color:var(--v2-muted)}.v2-review-item p,.v2-review-item small{color:var(--v2-muted);font-size:12px}.v2-review-item blockquote{margin:12px 0;padding:13px;border-left:3px solid #93c5fd;background:#f8fbff;font-size:12px;line-height:1.6}.v2-review-item textarea{width:100%;min-height:65px;margin:10px 0;padding:10px;border:1px solid var(--v2-line);border-radius:9px}.v2-settings-form{display:grid;grid-template-columns:repeat(3,1fr);align-items:end;gap:14px;margin:20px 0}.v2-settings-form label{display:grid;gap:9px;font-size:12px;color:var(--v2-muted)}.v2-settings-form input{width:100%;padding:10px;border:1px solid var(--v2-line);border-radius:9px;color:var(--v2-ink)}.v2-timeline pre{max-width:680px;overflow:auto;padding:10px;background:#f4f4f5;border-radius:8px}@media(max-width:800px){.v2-settings-form{grid-template-columns:1fr}.v2-admin-tabs button{font-size:11px;padding:8px 10px}.v2-timeline pre{max-width:270px}}.v2-profile-tabs{margin-top:20px}.v2-goal-form>label{display:grid;gap:8px;font-size:12px;color:var(--v2-muted)}.v2-goal-form input,.v2-goal-form select,.v2-settings-form select{width:100%;padding:10px;border:1px solid var(--v2-line);border-radius:9px;background:#fff;color:var(--v2-ink)}.v2-goal-form .v2-settings-form{margin-top:14px}.v2-check-row{display:flex;align-items:center;gap:9px;margin:15px 0;font-size:13px;color:var(--v2-muted)}.v2-check-row input{width:17px;height:17px}.v2-reduce-motion *,.v2-reduce-motion *:before,.v2-reduce-motion *:after{animation-duration:.01ms!important;transition-duration:.01ms!important}@media(prefers-reduced-motion:reduce){.v2-app *,.v2-app *:before,.v2-app *:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}.v2-objective-answer{width:100%;margin-top:auto;display:grid;gap:15px}.v2-objective-answer>input{padding:14px;border:1px solid #93c5fd;border-radius:11px;width:100%;color:var(--v2-ink);background:#fff}.v2-objective-answer .v2-actions{justify-content:center}.v2-options{display:grid;gap:10px;text-align:left}.v2-options button{display:flex;align-items:center;gap:12px;padding:14px;background:#fff;border:1px solid var(--v2-line);border-radius:11px;color:var(--v2-ink);text-align:left;cursor:pointer}.v2-options button.selected{border-color:var(--v2-blue);background:var(--v2-blue-soft)}.v2-options b{display:grid;place-items:center;min-width:25px;height:25px;border-radius:7px;background:#f4f4f5;font-size:12px}.v2-attempt-correct,.v2-attempt-wrong{width:100%;margin-bottom:12px;padding:11px;border-radius:10px;font-size:13px}.v2-attempt-correct{color:var(--v2-green);background:var(--v2-green-soft)}.v2-attempt-wrong{color:#b45309;background:#fff7ed}.v2-memory-chart{display:block;width:100%;margin:20px 0 10px}.v2-memory-chart text{fill:var(--v2-muted);font-size:12px}.v2-card-selector{width:100%;margin-top:12px;padding:11px;border:1px solid var(--v2-line);border-radius:9px;background:#fff}.v2-memory-meta{display:flex;flex-wrap:wrap;gap:15px;margin:12px 0;color:var(--v2-muted);font-size:12px}.v2-simple-table{width:100%;text-align:left;border-collapse:collapse;font-size:12px}.v2-simple-table th,.v2-simple-table td{padding:10px;border-bottom:1px solid var(--v2-line)}.v2-calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:7px;margin-top:20px}.v2-calendar-grid>div{min-height:70px;display:grid;gap:7px;padding:10px;border-radius:9px;border:1px solid var(--v2-line);color:var(--v2-muted)}.v2-calendar-grid>div.has-reviews{color:var(--v2-blue);background:var(--v2-blue-soft);border-color:#bfdbfe}.v2-calendar-grid span{font-size:10px}.v2-calendar-grid strong{font-size:18px}.v2-review-options{display:grid;grid-template-columns:repeat(2,1fr);gap:5px 20px;margin:5px 0 10px;padding-left:22px;font-size:12px;color:var(--v2-muted)}@media(max-width:800px){.v2-calendar-grid{gap:4px}.v2-calendar-grid>div{padding:7px 5px;min-height:58px}.v2-calendar-grid span{font-size:8px}.v2-memory-meta{font-size:11px}.v2-review-options{grid-template-columns:1fr}}.v2-library-row{grid-template-columns:40px 1fr auto 36px 36px}.v2-library-row small{color:var(--v2-faint);font-size:10px}.v2-text-link{padding:0;border:0;background:none;color:var(--v2-ink);font-weight:650;text-align:left;cursor:pointer}.v2-text-link:disabled{cursor:default;color:var(--v2-muted)}@media(max-width:800px){.v2-library-row{grid-template-columns:35px 1fr 30px 30px}.v2-library-row .v2-icon-button{width:30px;height:34px}.v2-library-row small{overflow-wrap:anywhere}}.v2-history-content{flex:1}.v2-auth-alternatives{display:flex;justify-content:center;gap:16px}.v2-auth-alternatives button{padding:5px;color:var(--v2-blue);background:none;border:0;cursor:pointer;font-size:11px}.v2-editor fieldset{border:1px solid var(--v2-line);border-radius:10px;padding:12px}.v2-editor legend{color:var(--v2-muted);font-size:12px}.v2-editor input{padding:10px;border:1px solid var(--v2-line);border-radius:8px}.v2-onboarding{max-width:720px;margin:8vh auto;text-align:center}.v2-onboarding>p{max-width:580px;margin:12px auto 28px;color:var(--v2-muted);line-height:1.7}.v2-onboarding form{text-align:left;display:grid;gap:16px}.v2-onboarding form>svg{color:var(--v2-blue)}.v2-onboarding form button{justify-self:start}.v2-onboarding>.v2-secondary{margin-top:14px}.v2-mfa-setup{display:grid;gap:10px}.v2-mfa-setup code{padding:10px;background:var(--v2-surface-muted,#f4f4f5);border-radius:8px;word-break:break-all}.v2-mfa-setup a{color:var(--v2-blue)}.v2-security-card>svg{color:var(--v2-blue)}