:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--brand-50:#e8f0fe;--brand-100:#d2e3fc;--brand-300:#8ab4f8;--brand-500:#4285f4;--brand-600:#1a73e8;--brand-700:#0b57d0;--gray-50:#f9fafb;--gray-100:#f3f4f6;--gray-200:#e5e7eb;--gray-300:#d1d5db;--gray-400:#9ca3af;--gray-500:#6b7280;--gray-600:#4b5563;--gray-900:#111827;--bg:#fff;--surface:#fff;--border:var(--gray-200);--control-border:var(--gray-300);--fg:var(--gray-900);--fg-muted:var(--gray-600);--fg-faint:var(--gray-500);--accent-bg:#111827;--accent-fg:#fff;--radius-control:6px;--radius-card:12px;--ease:cubic-bezier(.2, .7, .3, 1);--ok:#16a34a;--ok-bg:#f0fdf4;--warn:#d97706;--warn-bg:#fffbeb;--err:#b91c1c;--err-bg:#fef2f2}.dark{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#000;--surface:#0d0d0d;--border:#1f1f1f;--control-border:#303030;--fg:#f3f4f6;--fg-muted:#9ca3af;--fg-faint:#6b7280;--accent-bg:#f3f4f6;--accent-fg:#111827;--brand-600:#8ab4f8;--brand-700:#8ab4f8;--gray-50:#0d0d0d;--gray-100:#1a1a1a;--gray-200:#1f1f1f;--gray-300:#303030;--ok:#4ade80;--ok-bg:#052e16;--warn:#fbbf24;--warn-bg:#431407;--err:#f87171;--err-bg:#450a0a}*,:before,:after{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--fg);-webkit-font-smoothing:antialiased;transition:background-color .15s var(--ease), color .15s var(--ease);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif;font-size:14px;line-height:1.5}code,pre,kbd{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}h1,h2,h3,h4{letter-spacing:-.025em;font-weight:600;line-height:1.25}h1{font-size:26px}h2{font-size:20px}h3{font-size:16px}h4{font-size:14px}p{margin:0 0 12px}a{color:var(--brand-700);text-decoration:none}a:hover{text-decoration:underline}:focus-visible{outline-offset:2px;outline:3px solid #6b728066}::selection{background:var(--brand-100)}.container{max-width:72rem;margin:0 auto;padding:24px 16px 64px}.eyebrow{text-transform:uppercase;letter-spacing:.06em;color:var(--brand-600);margin:0 0 6px;font-size:12px;font-weight:600}.page-title{margin:0 0 8px;font-size:28px}.page-subtitle{color:var(--fg-muted);margin:0 0 28px;font-size:14px}.btn{border-radius:var(--radius-control);cursor:pointer;min-height:40px;transition:color .15s var(--ease), background-color .15s var(--ease), border-color .15s var(--ease), opacity .15s var(--ease);border:1px solid #0000;justify-content:center;align-items:center;gap:6px;padding:7px 14px;font-size:14px;font-weight:500;line-height:1.4;text-decoration:none;display:inline-flex}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent-bg);color:var(--accent-fg)}.btn-primary:hover:not(:disabled){opacity:.9;text-decoration:none}.btn-secondary{background:var(--surface);border-color:var(--control-border);color:var(--fg)}.btn-secondary:hover:not(:disabled){background:var(--gray-100);text-decoration:none}.btn-lg{border-radius:8px;min-height:44px;padding:0 20px}.btn-block{width:100%}.card{border:1px solid var(--border);border-radius:var(--radius-card);background:var(--surface);transition:border-color .15s var(--ease), background-color .15s var(--ease);padding:24px}.card-hover:hover{border-color:var(--gray-400)}.card-title{margin:0 0 8px;font-size:16px;font-weight:600}.card-subtitle{color:var(--fg-muted);margin:0;font-size:13px}.grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;display:grid}.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;display:grid}.pill{border:1px solid var(--border);color:var(--fg-muted);white-space:nowrap;border-radius:9999px;align-items:center;gap:4px;padding:3px 10px;font-size:12px;display:inline-flex}.pill-brand{background:var(--brand-50);color:var(--brand-700);border-color:#0000}.pill-ok{background:var(--ok-bg);color:var(--ok);border-color:#0000}.pill-warn{background:var(--warn-bg);color:var(--warn);border-color:#0000}.pill-err{background:var(--err-bg);color:var(--err);border-color:#0000}.input,.select{border:1px solid var(--control-border);border-radius:var(--radius-control);background:var(--surface);color:var(--fg);padding:8px 12px;font-family:inherit;font-size:14px}.input:focus,.select:focus{border-color:var(--gray-400);outline:none;box-shadow:0 0 0 2px #9ca3af4d}.muted{color:var(--fg-muted)}.faint{color:var(--fg-faint)}.small{font-size:12px}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mb-8{margin-bottom:8px}.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}.flex{align-items:center;gap:10px;display:flex}.flex-between{justify-content:space-between;align-items:center;gap:10px;display:flex}.flex-wrap{flex-wrap:wrap}.grow{flex:auto}.center{text-align:center}@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}.layout{flex-direction:column;min-height:100vh;display:flex}.navbar{z-index:100;border-bottom:1px solid var(--border);background:color-mix(in srgb, var(--bg) 85%, transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);height:56px;transition:background-color .15s var(--ease), border-color .15s var(--ease);position:sticky;top:0}.navbar-inner{align-items:center;gap:8px;max-width:72rem;height:100%;margin:0 auto;padding:0 16px;display:flex}.navbar-brand{color:var(--fg);flex-shrink:0;align-items:center;gap:8px;text-decoration:none;display:flex}.navbar-logo{font-size:24px;line-height:1}.navbar-title{letter-spacing:-.025em;font-size:15px;font-weight:600}.navbar-links{scrollbar-width:none;align-items:center;gap:2px;margin-left:auto;display:flex;overflow-x:auto}.navbar-links::-webkit-scrollbar{display:none}.nav-link{border-radius:var(--radius-control);color:var(--fg-muted);white-space:nowrap;transition:color .15s var(--ease), background-color .15s var(--ease);cursor:pointer;background:0 0;border:none;align-items:center;gap:4px;padding:6px 10px;font-family:inherit;font-size:13px;font-weight:500;text-decoration:none;display:inline-flex}.nav-link:hover{color:var(--fg);background:var(--gray-100);text-decoration:none}.nav-link.active{color:var(--brand-700);background:var(--brand-50)}.nav-icon{font-size:14px;line-height:1}.dark-toggle{border-left:1px solid var(--border);border-radius:0;margin-left:4px;padding-left:12px}.sync-indicator{align-items:center;gap:5px;font-size:12px;display:inline-flex}.sync-indicator-dot{border-radius:50%;flex-shrink:0;width:7px;height:7px}.sync-indicator-dot.sync-idle{background:var(--gray-400)}.sync-indicator-dot.sync-syncing{background:var(--brand-500);animation:1s ease-in-out infinite sync-pulse}.sync-indicator-dot.sync-synced{background:#22c55e}.sync-indicator-dot.sync-offline{background:#f59e0b}.sync-indicator-dot.sync-needs_password{background:var(--gray-400)}.sync-indicator-dot.sync-error{background:#ef4444}@keyframes sync-pulse{0%,to{opacity:1}50%{opacity:.35}}.navbar-toggle{cursor:pointer;border-radius:var(--radius-control);background:0 0;border:none;margin-left:auto;padding:8px;display:none}.hamburger{width:20px;height:14px;display:block;position:relative}.hamburger span{background:var(--fg);width:100%;height:2px;transition:all .2s var(--ease);border-radius:2px;display:block;position:absolute}.hamburger span:first-child{top:0}.hamburger span:nth-child(2){top:6px}.hamburger span:nth-child(3){top:12px}.hamburger.open span:first-child{top:6px;transform:rotate(45deg)}.hamburger.open span:nth-child(2){opacity:0}.hamburger.open span:nth-child(3){top:6px;transform:rotate(-45deg)}.main-content{flex:1}.footer{border-top:1px solid var(--border);text-align:center;margin-top:48px;padding:16px 0}@media (width<=768px){.navbar-toggle{display:block}.navbar-links{background:var(--bg);border-bottom:1px solid var(--border);flex-direction:column;gap:4px;max-height:calc(100vh - 56px);padding:8px 16px 16px;display:none;position:absolute;top:56px;left:0;right:0;overflow-y:auto}.navbar-links.open{display:flex}.nav-link{width:100%;padding:10px 12px;font-size:14px}.dark-toggle{border-left:none;border-top:1px solid var(--border);border-radius:0;margin-top:4px;margin-left:0;padding-top:12px;padding-left:12px}}.progress-wrap{width:100%}.progress-label{justify-content:space-between;align-items:center;margin-bottom:4px;display:flex}.progress-track{background:var(--gray-100);border-radius:9999px;width:100%;overflow:hidden}.progress-fill{background:var(--brand-500);height:100%;transition:width .28s var(--ease);border-radius:9999px}.course-card{color:inherit;flex-direction:column;gap:12px;text-decoration:none;display:flex}.course-card:hover{text-decoration:none}.course-card-header{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.course-card-stats{border-top:1px solid var(--border);gap:16px;padding-top:8px;display:flex}.stat-item{flex-direction:column;gap:2px;display:flex}.stat-value{color:var(--fg);font-size:18px;font-weight:600}.stat-label{color:var(--fg-faint);font-size:11px}.section-title{color:var(--fg-muted);text-transform:uppercase;letter-spacing:.04em;margin:0 0 12px;font-size:15px;font-weight:600}.stats-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:16px;display:grid}.stat-card{text-align:center;padding:20px 16px}.stat-icon{margin-bottom:8px;font-size:28px;line-height:1}.stat-num{margin-bottom:4px;font-size:28px;font-weight:700}.stat-desc{color:var(--fg-faint);font-size:12px}.activity-row{align-items:center;gap:12px;padding:8px 0;display:flex}.activity-row+.activity-row{border-top:1px solid var(--border)}.activity-icon{font-size:20px;line-height:1}.activity-text{color:var(--fg-muted);font-size:14px}.knowledge-card{padding:20px}.knowledge-header{justify-content:space-between;align-items:center;margin-bottom:10px;display:flex}.knowledge-index{color:var(--brand-600);letter-spacing:.06em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12px;font-weight:600}.knowledge-name{margin:0 0 8px;font-size:15px}.knowledge-content{color:var(--fg-muted);white-space:pre-wrap;margin:0;font-size:13.5px}.knowledge-empty{font-style:italic}.chapter-header{align-items:flex-start;gap:16px;margin-bottom:24px;display:flex}.chapter-header .btn{flex-shrink:0;margin-top:4px}.chapter-list{flex-direction:column;gap:8px;display:flex}.chapter-row{color:inherit;justify-content:space-between;align-items:center;gap:12px;padding:16px 20px;text-decoration:none;display:flex}.chapter-row:hover{text-decoration:none}.chapter-row-left{align-items:center;gap:16px;display:flex}.chapter-number{color:var(--brand-600);flex-shrink:0;width:48px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;font-weight:600}.chapter-row-title{font-size:15px;font-weight:500}.chapter-row-right{flex-shrink:0;align-items:center;gap:8px;display:flex}.chapter-actions{flex-wrap:wrap;gap:10px;margin-bottom:24px;display:flex}.knowledge-grid{flex-direction:column;gap:12px;display:flex}.course-selector{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:24px;display:flex}.course-select{border:1px solid var(--control-border);border-radius:var(--radius-control);color:var(--fg);transition:border-color .15s var(--ease), background-color .15s var(--ease);align-items:center;gap:8px;padding:8px 14px;font-size:14px;text-decoration:none;display:inline-flex}.course-select:hover{border-color:var(--gray-400);background:var(--gray-50);text-decoration:none}.course-select.active{border-color:var(--brand-500);background:var(--brand-50);color:var(--brand-700)}.course-select-id{background:var(--gray-100);border-radius:4px;padding:2px 6px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:11px;font-weight:600}.course-select.active .course-select-id{background:var(--brand-100)}.course-select-name{white-space:nowrap;text-overflow:ellipsis;max-width:220px;overflow:hidden}.flashcard-wrap{max-width:560px;margin:0 auto}.flashcard{perspective:1200px;cursor:pointer;-webkit-user-select:none;user-select:none;min-height:240px}.flashcard-inner{width:100%;height:240px;transform-style:preserve-3d;transition:transform .28s var(--ease);position:relative}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-face{backface-visibility:hidden;border:1px solid var(--border);border-radius:var(--radius-card);background:var(--surface);text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:16px;padding:32px 28px;display:flex;position:absolute;inset:0}.flashcard-back{transform:rotateY(180deg)}.flashcard-text{overflow-wrap:break-word;max-width:100%;margin:0;font-size:18px;font-weight:500;line-height:1.6}.flashcard-hint{opacity:.7;font-size:12px}.flashcard-actions{gap:12px;margin-top:20px;display:flex}.flashcard-btn{flex:1;min-height:44px;font-size:15px}@media (width<=480px){.flashcard-text{font-size:16px}}.flashcard-mode{flex-wrap:wrap;gap:10px;margin:16px 0 24px;display:flex}.flashcard-progress{text-align:center}.checklist-item{cursor:pointer;border-bottom:1px solid var(--border);min-height:40px;transition:background-color .15s var(--ease);align-items:flex-start;gap:12px;padding:10px 4px;display:flex}.checklist-item:hover{background:var(--gray-50)}.checklist-checkbox{width:18px;height:18px;accent-color:var(--brand-500);cursor:pointer;flex-shrink:0;margin-top:2px}.checklist-text{transition:color .15s var(--ease);font-size:14px;line-height:1.5}.checklist-text.done{color:var(--fg-faint);text-decoration:line-through}.checklist-sections{flex-direction:column;gap:8px;display:flex}.checklist-chapter-title{margin:0 0 8px;font-size:15px;font-weight:600}.question-card{flex-direction:column;gap:16px;display:flex}.question-meta{flex-wrap:wrap;gap:8px;display:flex}.question-text{margin:0;font-size:16px;font-weight:500;line-height:1.6}.question-options{flex-direction:column;gap:10px;display:flex}.question-option{text-align:left;border:1px solid var(--control-border);border-radius:var(--radius-control);background:var(--surface);width:100%;color:var(--fg);cursor:pointer;min-height:44px;transition:border-color .15s var(--ease), background-color .15s var(--ease), color .15s var(--ease);align-items:center;gap:12px;padding:12px 14px;font-family:inherit;font-size:14px;display:flex}.question-option:hover:not(:disabled){border-color:var(--gray-400);background:var(--gray-50)}.question-option.selected{border-color:var(--brand-500);background:var(--brand-50)}.question-option.correct{border-color:var(--ok);background:var(--ok-bg);color:var(--fg)}.question-option.wrong{border-color:var(--err);background:var(--err-bg)}.question-option.dim{opacity:.55}.option-letter{background:var(--gray-100);border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;width:24px;height:24px;font-size:12px;font-weight:600;display:inline-flex}.option-text{flex:1}.option-mark{color:var(--fg);flex-shrink:0;font-weight:700}.answer-reveal{border-radius:var(--radius-control);border:1px solid var(--border);flex-direction:column;gap:8px;padding:16px;display:flex}.reveal-correct{background:var(--ok-bg);border-color:var(--ok)}.reveal-wrong{background:var(--err-bg);border-color:var(--err)}.answer-verdict{font-size:16px;font-weight:600}.answer-detail{font-size:14px}.answer-analysis{border-top:1px dashed var(--border);margin-top:6px;padding-top:10px}.analysis-text{white-space:pre-wrap;margin:0;font-size:13.5px;line-height:1.7}.text-answer-area{text-align:center;padding:16px 0}.text-answer-preview{border:1px dashed var(--border);border-radius:var(--radius-control);background:var(--gray-50);white-space:pre-wrap;padding:16px}.dark .text-answer-preview{background:var(--surface)}.reveal-text{flex-direction:column;gap:12px;display:flex}.self-assess-actions{border-top:1px solid var(--border);flex-wrap:wrap;align-items:center;gap:10px;padding-top:8px;display:flex}.italic{font-style:italic}.practice-tabs{flex-wrap:wrap;gap:10px;margin-bottom:16px;display:flex}.practice-stats{flex-wrap:wrap;gap:8px;margin-bottom:16px;display:flex}.practice-progress{max-width:560px;margin:0 auto 16px}.framework-sections{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:16px;display:grid}.framework-name{margin:0 0 12px;font-size:16px;font-weight:600}.framework-items{flex-direction:column;gap:12px;margin:0;padding:0;list-style:none;display:flex}.framework-item{border-top:1px solid var(--border);padding-top:12px}.framework-question{margin-bottom:4px;font-size:14px;font-weight:500}.framework-guide{font-size:13px;line-height:1.6}.cases-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:16px;display:grid}.case-film{align-items:center;gap:8px;margin-bottom:10px;font-size:15px;font-weight:600;display:flex}.case-index{color:var(--brand-600);letter-spacing:.06em;background:var(--brand-50);border-radius:4px;padding:2px 6px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:11px;font-weight:600}.case-analysis-text{color:var(--fg-muted);white-space:pre-wrap;margin:0;font-size:13.5px;line-height:1.7}.tips-card{flex-direction:column;gap:10px;display:flex}.tip-row{align-items:flex-start;gap:10px;font-size:14px;line-height:1.6;display:flex}.tip-icon{flex-shrink:0}.diagrams-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px;display:grid}.diagram-card{flex-direction:column;gap:12px;display:flex}.diagram-header{justify-content:space-between;align-items:flex-start;gap:8px;display:flex}.diagram-title{margin:0;font-size:15px;font-weight:600}.diagram-desc{color:var(--fg-muted);margin:0;font-size:13px}.diagram-svg{border:1px solid var(--border);border-radius:var(--radius-control);background:#fff;justify-content:center;align-items:center;min-height:160px;padding:12px;display:flex;overflow:auto}.diagram-svg svg{max-width:100%;height:auto}.dark .diagram-svg{background:#0d0d0d}.diagram-empty{border:1px dashed var(--border);border-radius:var(--radius-control);justify-content:center;align-items:center;min-height:120px;font-size:13px;display:flex}.sync-desc{color:var(--fg-muted);margin:0 0 12px;font-size:13px;line-height:1.5}.sync-status-row{background:var(--gray-50);border-radius:var(--radius-card);align-items:center;gap:8px;margin-bottom:16px;padding:10px 12px;font-size:13px;display:flex}.sync-dot{border-radius:50%;flex-shrink:0;width:8px;height:8px}.sync-idle{background:var(--gray-300)}.sync-syncing{background:var(--brand-500);animation:1s ease-in-out infinite pulse}.sync-synced{background:#22c55e}.sync-offline{background:#f59e0b}.sync-needs_password{background:var(--gray-300)}.sync-error{background:#ef4444}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}.sync-status-text{font-weight:500}.sync-last{color:var(--fg-muted);margin-left:auto;font-size:12px}.sync-form{margin-bottom:16px}.sync-label{color:var(--fg);margin-bottom:6px;font-size:13px;font-weight:500;display:block}.sync-input-row{gap:8px;display:flex}.sync-input-row input{border:1px solid var(--border);border-radius:var(--radius-control);background:var(--bg);color:var(--fg);outline:none;flex:1;padding:8px 10px;font-size:14px}.sync-input-row input:focus{border-color:var(--brand-500);box-shadow:0 0 0 2px var(--brand-100)}.sync-msg{color:#22c55e;margin:6px 0 0;font-size:12px}.sync-hint{color:var(--fg-muted);margin:6px 0 0;font-size:12px;line-height:1.4}.sync-actions{flex-wrap:wrap;gap:8px;display:flex}.sync-actions .btn-ghost{color:var(--fg-muted);border:1px solid var(--border);background:0 0}.sync-actions .btn-ghost:hover{color:var(--fg);border-color:var(--gray-400)}.debug-table{border-collapse:collapse;width:100%;font-size:14px}.debug-table th,.debug-table td{text-align:left;border-bottom:1px solid var(--border);padding:10px 8px}.debug-table th{color:var(--fg-faint);text-transform:uppercase;letter-spacing:.04em;font-size:12px;font-weight:600}.debug-table code{background:var(--gray-100);border-radius:4px;padding:2px 6px;font-size:13px}.debug-expected{flex-direction:column;gap:8px;display:flex}.debug-file{align-items:center;gap:10px;padding:8px 0;display:flex}.debug-file code{font-size:13px}.debug-status{font-size:14px}