:root{--color-indigo-950: #0c1525;--color-indigo-900: #1b2a4a;--color-indigo-800: #24375f;--color-indigo-700: #2e4577;--color-parchment-50: #fdfaf4;--color-parchment-100: #fbf7ee;--color-parchment-200: #f2e8d5;--color-parchment-300: #e4d6be;--color-parchment-400: #d8cebc;--color-marigold-500: #e8a33d;--color-marigold-600: #cf8b26;--color-marigold-100: #fdf4e6;--color-marigold-50: #fff9f0;--color-teal-700: #24584e;--color-teal-600: #2f6e62;--color-teal-500: #3b8778;--color-teal-100: #e3efe9;--color-teal-50: #f0f6f4;--color-ink-950: #0d1015;--color-ink-900: #14181f;--color-ink-700: #333945;--color-ink-500: #555d6b;--color-ink-400: #7c8594;--color-success: #287a53;--color-success-light: #eaf5ee;--color-danger: #c0392b;--color-danger-light: #fbeee8;--color-bg-page: var(--color-parchment-100);--color-bg-surface: #ffffff;--color-bg-subsurface: #f8f9fa;--color-bg-dark: var(--color-indigo-950);--color-bg-dark-accent: var(--color-indigo-900);--color-text-primary: var(--color-ink-900);--color-text-secondary: var(--color-ink-700);--color-text-muted: var(--color-ink-500);--color-text-on-dark: #ffffff;--color-text-on-parchment: var(--color-ink-900);--color-interactive: var(--color-teal-600);--color-interactive-hover: var(--color-teal-700);--color-interactive-light: var(--color-teal-50);--color-interactive-border: var(--color-teal-100);--color-accent-gold: var(--color-marigold-500);--color-accent-gold-hover: var(--color-marigold-600);--color-accent-gold-light: var(--color-marigold-100);--color-border-subtle: #ebebeb;--color-border-card: #e4e4e7;--color-border: var(--color-parchment-400);--color-border-strong: var(--color-ink-500);--color-focus-ring: var(--color-teal-600);--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px;--space-10: 40px;--space-12: 48px;--space-16: 64px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--radius-full: 9999px;--shadow-sm: 0 1px 2px rgba(15, 20, 30, .04);--shadow-card: 0 1px 3px rgba(15, 20, 30, .06);--shadow-md: 0 4px 8px rgba(15, 20, 30, .08);--shadow-lg: 0 8px 24px rgba(15, 20, 30, .12);--font-headline: "Bitter", "Georgia", serif;--font-family: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{font-family:var(--font-family);background-color:var(--color-bg-page);color:var(--color-text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100dvh}h1,h2,h3,h4,h5,h6{font-family:var(--font-headline);color:var(--color-text-primary);font-weight:700;line-height:1.25}:focus-visible{outline:2px solid var(--color-focus-ring);outline-offset:2px}.app-container{width:100%;max-width:1280px;margin:0 auto;padding:0 var(--space-4)}@media(min-width:768px){.app-container{padding:0 var(--space-6)}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);min-height:44px;padding:var(--space-2) var(--space-4);font-family:var(--font-family);font-size:.925rem;font-weight:600;border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:background-color .15s ease,border-color .15s ease;-webkit-user-select:none;user-select:none;text-decoration:none}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background-color:var(--color-interactive);color:#fff;border-color:var(--color-interactive)}.btn-primary:hover:not(:disabled){background-color:var(--color-interactive-hover);border-color:var(--color-interactive-hover)}.btn-secondary{background-color:var(--color-bg-surface);color:var(--color-text-primary);border-color:var(--color-border-card)}.btn-secondary:hover:not(:disabled){background-color:var(--color-bg-subsurface);border-color:var(--color-border-strong)}.btn-gold{background-color:var(--color-accent-gold);color:#fff;border-color:var(--color-accent-gold)}.btn-gold:hover:not(:disabled){background-color:var(--color-accent-gold-hover)}.btn-sm{min-height:38px;padding:var(--space-1) var(--space-3);font-size:.85rem}.card{background-color:var(--color-bg-surface);border:1px solid var(--color-border-card);border-radius:var(--radius-lg);padding:var(--space-5);box-shadow:var(--shadow-sm)}.badge{display:inline-flex;align-items:center;gap:var(--space-1);padding:3px var(--space-3);font-size:.75rem;font-weight:600;border-radius:var(--radius-sm)}.badge-teal{background-color:var(--color-interactive-light);color:var(--color-interactive-hover);border:1px solid var(--color-interactive-border)}.badge-gold{background-color:var(--color-accent-gold-light);color:#8c570b;border:1px solid #fbd38d}.badge-slate{background-color:var(--color-parchment-200);color:var(--color-text-secondary);border:1px solid var(--color-border-subtle)}.form-group{margin-bottom:var(--space-4)}.form-label{display:block;font-size:.875rem;font-weight:600;color:var(--color-text-secondary);margin-bottom:var(--space-1)}.form-input,.form-select,.form-textarea{width:100%;min-height:44px;padding:var(--space-2) var(--space-3);font-family:inherit;font-size:.95rem;color:var(--color-text-primary);background-color:var(--color-bg-surface);border:1px solid var(--color-border-card);border-radius:var(--radius-md);transition:border-color .15s ease}.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;border-color:var(--color-focus-ring);box-shadow:0 0 0 3px #2f6e6226}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background-color:#14181fa6;display:flex;align-items:center;justify-content:center;padding:var(--space-4);z-index:1000}.modal-content{background-color:var(--color-bg-surface);border:1px solid var(--color-border-card);border-radius:var(--radius-lg);max-width:600px;width:100%;max-height:88vh;overflow-y:auto;box-shadow:var(--shadow-lg);padding:var(--space-6)}.alert{padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);font-size:.9rem;margin-bottom:var(--space-4);display:flex;align-items:flex-start;gap:var(--space-3)}.alert-info{background-color:var(--color-teal-50);border:1px solid var(--color-teal-100);color:var(--color-teal-700)}.alert-warning{background-color:var(--color-accent-gold-light);border:1px solid #fbd38d;color:#8c570b}.alert-danger{background-color:var(--color-danger-light);border:1px solid #fadbd8;color:var(--color-danger)}.student-header{background-color:var(--color-indigo-950);color:#fff;border-bottom:1px solid 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var(--color-border-card);background-color:var(--color-bg-subsurface);color:var(--color-ink-900);cursor:pointer;transition:border-color .15s ease;max-width:360px}.material-select-control:focus{outline:none;border-color:var(--color-interactive);box-shadow:0 0 0 3px #2f6e621f}.student-primary-nav{display:flex;align-items:center;gap:var(--space-1)}.student-nav-tab{display:inline-flex;align-items:center;gap:var(--space-2);padding:6px 14px;font-family:var(--font-family);font-size:.875rem;font-weight:600;color:#fff9;border-radius:var(--radius-md);text-decoration:none;white-space:nowrap;min-height:40px;border:1px solid transparent;background:none;cursor:pointer;transition:background-color .15s ease,color .15s ease}.student-nav-tab:hover{background-color:#ffffff14;color:#fff}.student-nav-tab.active{background-color:#ffffff1f;color:#fff;border-color:#ffffff26}.beranda-tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:var(--space-3)}.beranda-tool-card{display:flex;align-items:flex-start;gap:var(--space-4);padding:var(--space-4) var(--space-5);background-color:var(--color-bg-surface);border:1px solid var(--color-border-card);border-radius:var(--radius-lg);cursor:pointer;text-align:left;font-family:var(--font-family);transition:border-color .15s ease,box-shadow .15s ease,transform .12s ease;box-shadow:var(--shadow-sm)}.beranda-tool-card:hover{border-color:var(--card-accent, var(--color-teal-600));box-shadow:var(--shadow-md);transform:translateY(-1px)}.beranda-tool-card:active{transform:translateY(0);box-shadow:var(--shadow-sm)}.beranda-tool-icon{width:40px;height:40px;border-radius:var(--radius-md);background-color:var(--color-bg-subsurface);display:flex;align-items:center;justify-content:center;flex-shrink:0;border:1px solid var(--color-border-subtle)}.beranda-tool-body{flex:1;min-width:0}.beranda-tool-title{font-size:.925rem;font-weight:700;color:var(--color-text-primary);margin-bottom:4px}.beranda-tool-desc{font-size:.825rem;color:var(--color-text-muted);line-height:1.5}.el-tab-bar{display:flex;align-items:center;gap:var(--space-1);background-color:var(--color-bg-surface);border:1px solid var(--color-border-card);border-radius:var(--radius-lg);padding:var(--space-2);overflow-x:auto;scrollbar-width:none}.el-tab-bar::-webkit-scrollbar{display:none}.el-tab-back{display:inline-flex;align-items:center;gap:var(--space-1);padding:6px 12px;font-family:var(--font-family);font-size:.825rem;font-weight:600;color:var(--color-text-muted);border:none;background:none;cursor:pointer;border-radius:var(--radius-md);white-space:nowrap;transition:color .12s ease,background-color .12s ease;min-height:36px}.el-tab-back:hover{color:var(--color-text-primary);background-color:var(--color-bg-subsurface)}.el-tab-divider{width:1px;height:20px;background-color:var(--color-border-subtle);flex-shrink:0;margin:0 var(--space-1)}.el-tab-item{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;font-family:var(--font-family);font-size:.85rem;font-weight:600;color:var(--color-text-muted);border:1px solid transparent;background:none;cursor:pointer;border-radius:var(--radius-md);white-space:nowrap;min-height:36px;transition:background-color .12s ease,color .12s ease}.el-tab-item:hover{background-color:var(--color-bg-subsurface);color:var(--color-text-primary)}.el-tab-active{background-color:var(--color-indigo-900);color:#fff;border-color:transparent}.el-tab-active:hover{background-color:var(--color-indigo-800);color:#fff}.el-tab-icon{display:flex;align-items:center;opacity:.75}.el-tab-active .el-tab-icon{opacity:1}.el-hub-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-3)}@media(max-width:600px){.el-hub-grid{grid-template-columns:1fr}}@media(min-width:900px){.el-hub-grid{grid-template-columns:repeat(3,1fr)}}.el-hub-card{display:flex;align-items:center;gap:var(--space-4);padding:var(--space-5);background-color:var(--color-bg-surface);border:1px solid var(--color-border-card);border-radius:var(--radius-lg);cursor:pointer;text-align:left;font-family:var(--font-family);transition:border-color .15s ease,box-shadow .15s ease,transform .12s ease;box-shadow:var(--shadow-sm);position:relative}.el-hub-card--wide{grid-column:1 / -1}.el-hub-card:hover{border-color:var(--color-interactive);box-shadow:var(--shadow-md);transform:translateY(-1px)}.el-hub-card:active{transform:translateY(0);box-shadow:var(--shadow-sm)}.el-hub-card-icon{width:44px;height:44px;border-radius:var(--radius-md);background-color:var(--color-bg-subsurface);display:flex;align-items:center;justify-content:center;flex-shrink:0;color:var(--color-text-secondary);border:1px solid var(--color-border-subtle)}.el-hub-card-body{flex:1;min-width:0}.el-hub-card-title{font-size:1rem;font-weight:700;color:var(--color-text-primary);margin-bottom:4px}.el-hub-card-desc{font-size:.85rem;color:var(--color-text-muted);line-height:1.5}.el-hub-card-arrow{font-size:1.1rem;color:var(--color-text-muted);flex-shrink:0;transition:transform .15s ease;margin-left:var(--space-2)}.el-hub-card:hover .el-hub-card-arrow{transform:translate(3px);color:var(--color-interactive)}.flashcard-container{max-width:680px;margin:var(--space-5) auto;perspective:1200px}.flashcard-scene{width:100%;height:340px;cursor:pointer;-webkit-user-select:none;user-select:none}.flashcard-card{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.4,0,.2,1);border-radius:var(--radius-lg)}.flashcard-card.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;border-radius:var(--radius-lg);padding:var(--space-6);display:flex;flex-direction:column;justify-content:space-between;border:1px solid var(--color-border-card);background-color:var(--color-bg-surface)}.flashcard-back{background-color:var(--color-parchment-50);border-color:var(--color-teal-100);transform:rotateY(180deg)}.flashcard-question{font-family:var(--font-headline);font-size:1.3rem;font-weight:700;line-height:1.4;color:var(--color-ink-900);margin:var(--space-4) 0}.flashcard-answer{font-size:1.1rem;font-weight:600;line-height:1.5;color:var(--color-ink-900);margin:var(--space-3) 0}.flashcard-controls{display:flex;align-items:center;justify-content:space-between;max-width:680px;margin:var(--space-4) auto;gap:var(--space-3);flex-wrap:wrap}.timeline-list{position:relative;max-width:760px;margin:var(--space-5) auto;padding-left:var(--space-8)}.timeline-list:before{content:"";position:absolute;top:0;bottom:0;left:15px;width:2px;background-color:var(--color-border-card)}.timeline-item{position:relative;margin-bottom:var(--space-6)}.timeline-dot{position:absolute;left:-33px;top:4px;width:14px;height:14px;border-radius:50%;background-color:var(--color-accent-gold);border:3px solid var(--color-bg-page)}.timeline-card{background-color:var(--color-bg-surface);border:1px solid var(--color-border-card);border-radius:var(--radius-md);padding:var(--space-4) var(--space-5);transition:border-color .15s ease}.timeline-card:hover{border-color:var(--color-accent-gold)}.timeline-date{font-size:.8rem;font-weight:700;color:var(--color-teal-700);text-transform:uppercase;letter-spacing:.04em}.timeline-title{font-family:var(--font-headline);font-size:1.1rem;font-weight:700;margin:var(--space-1) 0 var(--space-2) 0}.tory-container{max-width:820px;margin:0 auto;background-color:var(--color-bg-surface);border:1px solid var(--color-border-card);border-radius:var(--radius-lg);overflow:hidden;display:flex;flex-direction:column;height:580px}.tory-messages{flex:1;overflow-y:auto;padding:var(--space-5);display:flex;flex-direction:column;gap:var(--space-4);background-color:var(--color-bg-subsurface)}.chat-bubble{max-width:80%;padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);font-size:.925rem;line-height:1.55}.bubble-student{align-self:flex-end;background-color:var(--color-indigo-900);color:#fff;border-radius:var(--radius-md) var(--radius-md) 4px var(--radius-md)}.bubble-tory{align-self:flex-start;background-color:var(--color-bg-surface);border:1px solid var(--color-border-card);color:var(--color-ink-900);border-radius:var(--radius-md) var(--radius-md) var(--radius-md) 4px}.tory-input-bar{display:flex;gap:var(--space-2);padding:var(--space-3) var(--space-4);background-color:var(--color-bg-surface);border-top:1px solid var(--color-border-card)}.teacher-header{background-color:var(--color-indigo-950);color:#fff;border-bottom:1px solid rgba(255,255,255,.07);position:sticky;top:0;z-index:100}.teacher-header-inner{display:flex;align-items:center;justify-content:space-between;height:60px;gap:var(--space-4)}.teacher-layout{display:flex;min-height:calc(100dvh - 60px);background-color:var(--color-bg-page)}.teacher-sidebar{width:240px;background-color:var(--color-indigo-950);color:#fff;border-right:1px solid rgba(255,255,255,.07);padding:var(--space-4) var(--space-3);display:flex;flex-direction:column;justify-content:space-between;flex-shrink:0}@media(max-width:768px){.teacher-layout{flex-direction:column}.teacher-sidebar{width:100%;padding:var(--space-3);border-right:none;border-bottom:1px solid rgba(255,255,255,.07)}}.teacher-sidebar-brand{padding:0 var(--space-2) var(--space-4) var(--space-2);border-bottom:1px solid rgba(255,255,255,.07);margin-bottom:var(--space-4)}.teacher-sidebar-title{font-size:.7rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:#fff6;margin-bottom:2px}.teacher-sidebar-subtitle{font-size:.9rem;font-weight:700;color:#fff}.teacher-sidebar-nav{display:flex;flex-direction:column;gap:2px}@media(max-width:768px){.teacher-sidebar-nav{flex-direction:row;overflow-x:auto;scrollbar-width:none}.teacher-sidebar-nav::-webkit-scrollbar{display:none}}.teacher-sidebar-link{display:flex;align-items:center;gap:var(--space-3);padding:9px 12px;color:#ffffff8c;font-family:var(--font-family);font-size:.875rem;font-weight:600;border-radius:var(--radius-md);border:none;background:transparent;cursor:pointer;text-align:left;min-height:44px;transition:background-color .12s ease,color .12s ease;width:100%}.teacher-sidebar-link:hover{background-color:#ffffff12;color:#fff}.teacher-sidebar-link.active{background-color:#ffffff1f;color:#fff}.teacher-sidebar-badge{margin-left:auto;font-size:.7rem;background-color:#ffffff1f;padding:2px 6px;border-radius:var(--radius-sm);font-weight:600;color:#ffffffb3}.teacher-main-content{flex:1;padding:var(--space-6);max-width:1100px;min-width:0}@media(max-width:768px){.teacher-main-content{padding:var(--space-4)}}.dropzone{border:2px dashed var(--color-border-card);border-radius:var(--radius-lg);padding:var(--space-8) var(--space-6);text-align:center;background-color:var(--color-bg-surface);cursor:pointer;transition:border-color .15s ease,background-color .15s ease}.dropzone:hover,.dropzone.active{border-color:var(--color-interactive);background-color:var(--color-teal-50)}.topic-bar-container{display:flex;flex-direction:column;gap:var(--space-3)}.topic-bar-item{background-color:var(--color-bg-surface);border:1px solid var(--color-border-card);border-radius:var(--radius-md);padding:var(--space-4)}.topic-progress-track{width:100%;height:6px;background-color:var(--color-parchment-200);border-radius:var(--radius-full);overflow:hidden;margin-top:var(--space-2)}.topic-progress-fill{height:100%;border-radius:var(--radius-full);transition:width .3s ease}.fill-danger{background-color:var(--color-danger)}.fill-warning{background-color:var(--color-accent-gold)}.fill-success{background-color:var(--color-success)}.chunk-card{background-color:var(--color-bg-surface);border:1px solid var(--color-border-card);border-radius:var(--radius-md);padding:var(--space-4);margin-bottom:var(--space-3);font-size:.9rem;line-height:1.6}.privacy-notice{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);background-color:var(--color-teal-50);border:1px solid var(--color-teal-100);border-radius:var(--radius-md);color:var(--color-teal-700);font-size:.875rem;font-weight:500;margin-bottom:var(--space-5)}