@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap";
:root{--bg:#f0f2f5;--card:#ffffffb8;--card-solid:#fff;--ink:#0f172a;--muted:#64748b;--brand:#6366f1;--brand-2:#4f46e5;--brand-light:#6366f114;--brand-glow:#6366f12e;--accent:#f59e0b;--accent-light:#f59e0b1a;--success:#10b981;--danger:#ef4444;--line:#94a3b82e;--shadow-sm:0 1px 3px #0f172a0a, 0 1px 2px #0f172a0f;--shadow:0 4px 24px #0f172a0f, 0 1px 4px #0f172a0a;--shadow-lg:0 20px 60px #0f172a1a, 0 4px 16px #0f172a0f;--shadow-brand:0 8px 32px #6366f133;--radius:16px;--radius-sm:10px;--radius-xs:8px;--transition:.2s cubic-bezier(.4, 0, .2, 1);--font:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}html,body{font-family:var(--font);background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;padding:0;line-height:1.6}a{color:inherit;text-decoration:none}.app-shell{max-width:1120px;min-height:100dvh;margin:0 auto;padding:20px 24px 48px}.app-nav{-webkit-backdrop-filter:blur(20px)saturate(1.8);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);z-index:100;transition:box-shadow var(--transition);background:#fff9;justify-content:space-between;align-items:center;gap:16px;margin-bottom:24px;padding:14px 20px;display:flex;position:sticky;top:12px}.app-nav:hover{box-shadow:var(--shadow)}.app-brand{align-items:center;gap:12px;display:flex}.app-brand-mark{letter-spacing:.06em;color:#fff;background:linear-gradient(135deg, var(--brand), #a855f7);width:40px;height:40px;transition:transform var(--transition), box-shadow var(--transition);border-radius:12px;place-items:center;font-size:.82rem;font-weight:800;display:grid;box-shadow:0 4px 12px #6366f14d}.app-brand:hover .app-brand-mark{transform:scale(1.05)rotate(-2deg);box-shadow:0 6px 20px #6366f166}.app-brand strong{letter-spacing:-.02em;font-size:1.05rem;font-weight:700;display:block}.app-brand small{color:var(--muted);letter-spacing:.02em;margin-top:1px;font-size:.72rem;font-weight:500;display:block}.app-nav-links{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.app-nav-user{background:var(--brand-light);color:var(--ink);border-radius:999px;align-items:center;gap:8px;padding:4px 12px 4px 4px;font-size:.82rem;font-weight:600;display:flex}.app-nav-user-avatar{color:#fff;background:linear-gradient(135deg, var(--brand), #a855f7);border-radius:50%;place-items:center;width:28px;height:28px;font-size:.72rem;font-weight:800;display:grid}.app-nav-user-name{text-overflow:ellipsis;white-space:nowrap;max-width:120px;overflow:hidden}.card{background:var(--card);-webkit-backdrop-filter:blur(16px)saturate(1.6);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);transition:box-shadow var(--transition), transform var(--transition), border-color var(--transition)}.card-modal{background:var(--card-solid);-webkit-backdrop-filter:none}.btn{background:var(--brand);color:#fff;border-radius:var(--radius-sm);font-family:var(--font);letter-spacing:-.01em;cursor:pointer;transition:all var(--transition);border:0;justify-content:center;align-items:center;gap:6px;padding:10px 18px;font-size:.88rem;font-weight:600;display:inline-flex;position:relative;overflow:hidden}.btn:after{content:"";pointer-events:none;background:linear-gradient(#ffffff1f 0%,#0000 60%);position:absolute;inset:0}.btn:hover{background:var(--brand-2);box-shadow:var(--shadow-brand);transform:translateY(-1px)}.btn:active{box-shadow:none;transform:translateY(0)}.btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}.btn-secondary{color:var(--ink);border:1px solid var(--line);box-shadow:var(--shadow-sm);background:#fffc}.btn-secondary:after{display:none}.btn-secondary:hover{box-shadow:var(--shadow);color:var(--brand);background:#fff;border-color:#6366f14d}.grid{gap:16px;display:grid}@media (max-width:768px){.app-shell{padding:12px 16px 40px}.app-nav{flex-direction:column;align-items:stretch;padding:12px 16px;position:sticky;top:8px}.app-nav-links{justify-content:stretch}.app-nav-links .btn{text-align:center;flex:1}}.library-shell{gap:16px;display:grid}.library-hero{background:var(--card);padding:32px 28px;position:relative;overflow:hidden}.library-hero:before{content:"";background:radial-gradient(circle, var(--brand-glow) 0%, transparent 70%);pointer-events:none;width:400px;height:400px;position:absolute;top:-40%;right:-20%}.library-hero:after{content:"";pointer-events:none;background:radial-gradient(circle,#f59e0b1a 0%,#0000 70%);width:300px;height:300px;position:absolute;bottom:-50%;left:-10%}.library-hero-kicker{background:var(--brand-light);color:var(--brand);text-transform:uppercase;letter-spacing:.08em;border-radius:999px;align-items:center;gap:6px;margin:0 0 10px;padding:4px 12px;font-size:.72rem;font-weight:700;display:inline-flex;position:relative}.library-hero h1{letter-spacing:-.03em;margin:0;font-size:clamp(1.6rem,3.5vw,2.2rem);font-weight:800;line-height:1.2;position:relative}.library-hero p{color:var(--muted);max-width:680px;margin:10px 0 0;font-size:.95rem;line-height:1.6;position:relative}.library-metrics{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;display:grid}.library-metric{padding:18px 20px;position:relative;overflow:hidden}.library-metric:before{content:"";background:linear-gradient(180deg, var(--brand), var(--accent));border-radius:0 3px 3px 0;width:3px;height:100%;position:absolute;top:0;left:0}.library-metric p{color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin:0;font-size:.82rem;font-weight:600}.library-metric strong{letter-spacing:-.02em;background:linear-gradient(135deg, var(--ink), var(--brand));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-top:6px;font-size:1.5rem;font-weight:800;display:block}.library-toolbar{grid-template-columns:minmax(0,1fr) 220px;gap:14px;padding:18px;display:grid}.library-search,.library-sort{gap:6px;display:grid}.library-search span,.library-sort span{color:var(--muted);text-transform:uppercase;letter-spacing:.04em;font-size:.78rem;font-weight:600}.library-search input,.library-sort select{border:1px solid var(--line);border-radius:var(--radius-sm);color:var(--ink);font-family:var(--font);transition:all var(--transition);background:#fffc;padding:11px 14px;font-size:.9rem}.library-search input::placeholder{color:#94a3b8}.library-search input:focus,.library-sort select:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-glow);background:#fff;outline:none}.library-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;display:grid}.library-card{flex-direction:column;padding:0;transition:all .24s cubic-bezier(.4,0,.2,1);display:flex;position:relative;overflow:hidden}.library-card-link{color:inherit;flex-direction:column;flex:1;padding:20px;text-decoration:none;display:flex}.library-card-delete{color:#ef4444;cursor:pointer;opacity:0;width:32px;height:32px;transition:all var(--transition);z-index:10;pointer-events:auto;background:#ef44441a;border:none;border-radius:8px;place-items:center;font-size:.88rem;font-weight:700;display:grid;position:absolute;top:10px;right:10px}.library-card:hover .library-card-delete{opacity:1}.library-card-delete:hover{color:#fff;background:#ef4444;box-shadow:0 4px 12px #ef44444d}.library-card:before{content:"";background:linear-gradient(135deg, var(--brand-light) 0%, transparent 50%);opacity:0;transition:opacity var(--transition);position:absolute;inset:0}.library-card:hover{box-shadow:var(--shadow-lg);border-color:#6366f133;transform:translateY(-4px)}.library-card:hover:before{opacity:1}.library-card-top{justify-content:space-between;align-items:center;gap:8px;display:flex;position:relative}.library-card-top p{color:var(--muted);margin:0;font-size:.76rem;font-weight:600}.library-card-top span{border:1px solid var(--line);color:var(--brand);background:var(--brand-light);border-radius:999px;padding:3px 10px;font-size:.72rem;font-weight:700}.library-card h2{letter-spacing:-.01em;margin:14px 0 12px;font-size:1.06rem;font-weight:700;line-height:1.35;position:relative}.library-card-tags{flex-wrap:wrap;gap:6px;display:flex;position:relative}.library-card-tags span{color:var(--muted);border:1px solid var(--line);background:#94a3b81a;border-radius:999px;padding:4px 10px;font-size:.72rem;font-weight:600}.library-card-action{color:var(--brand);transition:gap var(--transition);align-items:center;gap:4px;margin:16px 0 0;font-size:.84rem;font-weight:700;display:flex;position:relative}.library-card:hover .library-card-action{gap:8px}.library-card-action:after{content:"→";transition:transform var(--transition)}.library-card:hover .library-card-action:after{transform:translate(2px)}.library-empty{text-align:center;justify-items:center;gap:10px;padding:32px 24px;display:grid}.library-empty h2{margin:0;font-weight:700}.library-empty p{color:var(--muted);max-width:400px;margin:0 0 8px}@media (max-width:1024px){.library-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:768px){.library-hero{padding:24px 20px}.library-toolbar{grid-template-columns:1fr;padding:14px}.library-metrics,.library-grid{grid-template-columns:1fr}.library-card-delete{opacity:.7}}@media (max-width:480px){.library-hero h1{font-size:1.4rem}.library-hero p{font-size:.88rem}.library-metric{padding:14px 16px}.library-card{padding:16px}}.reader-shell{gap:16px;display:grid}.reader-header{padding:28px 24px;position:relative;overflow:hidden}.reader-header:before{content:"";background:radial-gradient(circle, var(--brand-glow) 0%, transparent 70%);pointer-events:none;width:350px;height:350px;position:absolute;top:-60%;right:-15%}.reader-header h2{letter-spacing:-.03em;margin:0;font-size:clamp(1.5rem,2.8vw,2rem);font-weight:800;line-height:1.2;position:relative}.reader-header p{color:var(--muted);margin:8px 0 0;font-size:.92rem;position:relative}.reader-kicker{background:linear-gradient(135deg, var(--brand-light), #a855f714);letter-spacing:.08em;text-transform:uppercase;color:var(--brand);border-radius:999px;margin:0 0 10px;padding:4px 12px;font-size:.72rem;font-weight:700;display:inline-flex;position:relative}.reader-controls{z-index:50;-webkit-backdrop-filter:blur(16px)saturate(1.6);background:#ffffffd9;padding:18px 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24px}.reader-text-flow{white-space:pre-wrap;word-wrap:break-word;color:#1e293b;font-size:clamp(1.02rem,1.8vw,1.14rem);line-height:2}.reader-chunk{white-space:pre-wrap}.reader-word{color:#334155;cursor:pointer;-webkit-user-select:text;user-select:text;font-family:var(--font);font-size:inherit;line-height:inherit;transition:color var(--transition), background var(--transition);background:0 0;border:0;border-radius:4px;margin:0;padding:0 1px;font-weight:500}.reader-word:hover{color:var(--brand);background:var(--brand-light)}.reader-word-read{color:#1e293b;opacity:.55}.reader-word-active{border-radius:4px;box-shadow:0 2px 8px #6366f14d;color:#fff!important;background:var(--brand)!important;opacity:1!important}.reader-tooltip{z-index:1000;pointer-events:none;border-radius:var(--radius-sm);-webkit-backdrop-filter:blur(12px);color:#f8fafc;background:#0f172aeb;min-width:160px;max-width:260px;padding:12px 14px;animation:.18s cubic-bezier(.4,0,.2,1) 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var(--brand-glow);background:#fff;outline:none}.admin-field textarea{resize:vertical;min-height:200px}.admin-field-row{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;display:grid}.admin-checkbox{cursor:pointer;align-items:center;gap:10px;font-size:.9rem;font-weight:500;display:flex;position:relative}.admin-checkbox input[type=checkbox]{width:18px;height:18px;accent-color:var(--brand);cursor:pointer}.admin-actions{flex-wrap:wrap;gap:10px;display:flex}.admin-message-success{border-radius:var(--radius-xs);color:#065f46;background:#10b98114;border:1px solid #10b98126;margin:0;padding:8px 14px;font-size:.88rem;font-weight:600}.admin-message-error{border-radius:var(--radius-xs);color:#b91c1c;background:#ef44440f;border:1px solid #ef44441f;margin:0;padding:8px 14px;font-size:.88rem;font-weight:600}@media (max-width:768px){.admin-section{padding:20px 18px}}@media (max-width:480px){.admin-section{padding:18px 14px}.admin-actions{flex-direction:column}.admin-actions .btn{width:100%}}.login-shell{justify-content:center;align-items:center;min-height:70vh;padding:20px;display:flex}.login-card{width:100%;max-width:420px;padding:36px 32px;position:relative;overflow:hidden}.login-card:before{content:"";background:radial-gradient(circle, var(--brand-glow) 0%, transparent 70%);pointer-events:none;width:350px;height:350px;position:absolute;top:-50%;right:-30%}.login-header{text-align:center;margin-bottom:8px;position:relative}.login-brand-mark{letter-spacing:.06em;color:#fff;background:linear-gradient(135deg, var(--brand), #a855f7);border-radius:16px;justify-content:center;align-items:center;width:56px;height:56px;margin-bottom:16px;font-size:1.1rem;font-weight:800;display:inline-flex;box-shadow:0 6px 20px #6366f159}.login-header h1{letter-spacing:-.03em;margin:0;font-size:1.6rem;font-weight:800}.login-header p{color:var(--muted);margin:6px 0 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h1{letter-spacing:-.02em;margin:0;font-size:1.3rem;font-weight:800;position:relative}.dashboard-greeting-date{color:var(--muted);font-size:.82rem;position:relative}.dashboard-week-stats{border-top:1px solid var(--line);flex-wrap:wrap;gap:16px;margin-top:12px;padding-top:12px;display:flex;position:relative}.dashboard-week-stat{color:var(--muted);font-size:.82rem}.dashboard-week-stat strong{color:var(--ink);font-weight:700}.dashboard-alerts{gap:6px;display:grid}.dashboard-alert{border-radius:var(--radius-xs);color:inherit;transition:all var(--transition);border-left:3px solid;justify-content:space-between;align-items:center;padding:10px 16px;text-decoration:none;display:flex}.dashboard-alert:hover{transform:translate(2px)}.dashboard-alert-overdue{border-left-color:var(--danger);background:#ef44440f}.dashboard-alert-soon{border-left-color:var(--accent);background:#f59e0b0f}.dashboard-lessons{padding:20px}.dashboard-lessons-header{justify-content:space-between;align-items:center;margin-bottom:14px;display:flex}.dashboard-lessons-header h2{margin:0;font-size:1rem;font-weight:700}.dashboard-lessons-header a{color:var(--brand);font-size:.82rem;font-weight:600}.dashboard-lessons-header a:hover{text-decoration:underline}.dashboard-lesson-row{border-bottom:1px solid var(--line);color:inherit;transition:background var(--transition);grid-template-columns:1fr auto auto;align-items:center;gap:12px;padding:12px 0;text-decoration:none;display:grid}.dashboard-lesson-row:last-child{border-bottom:none}.dashboard-lesson-row:hover{background:var(--brand-light);border-radius:var(--radius-xs);margin:0 -20px;padding:12px 20px}.dashboard-lesson-info{min-width:0}.dashboard-lesson-title{align-items:center;gap:6px;display:flex}.dashboard-lesson-title strong{white-space:nowrap;text-overflow:ellipsis;font-size:.9rem;overflow:hidden}.dashboard-lesson-meta{color:var(--muted);flex-wrap:wrap;gap:6px;margin-top:2px;font-size:.75rem;display:flex}.dashboard-lesson-progress{align-items:center;gap:10px;display:flex}.progress-mini-group{flex-direction:column;gap:3px;min-width:70px;display:flex}.progress-mini-label{color:var(--muted);text-transform:uppercase;letter-spacing:.03em;font-size:.65rem;font-weight:600}.progress-mini{background:var(--line);border-radius:999px;height:4px;overflow:hidden}.progress-mini-fill{border-radius:999px;height:100%;transition:width .3s}.dashboard-lesson-right{flex-direction:column;align-items:flex-end;gap:4px;min-width:80px;display:flex}.quiz-badge{white-space:nowrap;border-radius:999px;align-items:center;padding:2px 8px;font-size:.72rem;font-weight:700;display:inline-flex}.dashboard-lesson-date{color:var(--ink);font-size:.75rem;font-weight:500}.dashboard-lesson-date:last-child{color:var(--muted);font-size:.72rem;font-weight:400}@media (max-width:640px){.dashboard-lesson-row{grid-template-columns:1fr;gap:8px}.dashboard-lesson-progress{justify-content:flex-start}.dashboard-lesson-right{flex-direction:row;align-items:center;gap:8px}.dashboard-week-stats{gap:8px}}.teacher-dashboard{gap:16px;display:grid}.teacher-header{padding:24px}.teacher-header-top{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:16px;display:flex}.teacher-greeting{letter-spacing:-.02em;margin:0;font-size:1.4rem;font-weight:800}.teacher-subtitle{color:var(--muted);margin:2px 0 0;font-size:.85rem}.teacher-quick-actions{gap:8px;display:flex}.teacher-stats-row{border-top:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:16px;margin-top:20px;padding-top:16px;display:flex}.teacher-stat{flex-direction:column;align-items:center;min-width:60px;display:flex}.teacher-stat-value{letter-spacing:-.02em;font-size:1.3rem;font-weight:800;line-height:1}.teacher-stat-label{text-transform:uppercase;letter-spacing:.04em;color:var(--muted);margin-top:2px;font-size:.72rem;font-weight:600}.teacher-stat-divider{background:var(--line);width:1px;height:28px}.teacher-quota-bar{flex-direction:column;flex:1;gap:4px;min-width:140px;display:flex}.teacher-quota-label{color:var(--muted);text-align:right;font-size:.72rem;font-weight:600}.teacher-quota-track{background:var(--line);border-radius:999px;height:6px}.teacher-quota-fill{border-radius:999px;height:100%;transition:width .3s}.teacher-grid{grid-template-columns:1fr 1fr;gap:16px;display:grid}.teacher-panel{padding:20px}.teacher-panel-header{justify-content:space-between;align-items:center;margin-bottom:14px;display:flex}.teacher-panel-header h2{margin:0;font-size:1rem;font-weight:700}.teacher-panel-link{color:var(--brand);font-size:.82rem;font-weight:600}.teacher-panel-link:hover{text-decoration:underline}.teacher-list{gap:6px;display:grid}.teacher-list-item{border-radius:var(--radius-xs);background:var(--bg);color:inherit;transition:all var(--transition);justify-content:space-between;align-items:center;padding:10px 14px;text-decoration:none;display:flex}.teacher-list-item:hover{background:var(--brand-light)}.teacher-list-item strong{font-size:.9rem}.teacher-list-meta{color:var(--muted);white-space:nowrap;font-size:.78rem}.teacher-article-info{flex-direction:column;gap:2px;min-width:0;display:flex}.teacher-article-title-row{align-items:center;gap:8px;display:flex}.teacher-level-badge{color:var(--brand);background:var(--brand-light);border-radius:999px;padding:1px 6px;font-size:.68rem;font-weight:700}.teacher-empty{color:var(--muted);text-align:center;margin:0;padding:20px 0;font-size:.88rem}@media (max-width:768px){.teacher-grid{grid-template-columns:1fr}.teacher-header-top{flex-direction:column}.teacher-stats-row{gap:12px}.app-nav-user-name{display:none}}@media (max-width:480px){.teacher-header{padding:18px 16px}.teacher-quick-actions{width:100%}.teacher-quick-actions .btn{flex:1}}