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var(--nav-border,#e2e8f099);z-index:90;transition:var(--transition);flex-direction:column;flex-shrink:0;align-items:center;gap:1rem;padding:1.5rem 0;display:flex}.sidebar-item{cursor:pointer;width:48px;height:48px;color:var(--color-text-muted);background:0 0;border:none;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;gap:4px;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;position:relative}.sidebar-item span.icon-label{opacity:0;white-space:nowrap;font-size:.6rem;font-weight:700;transition:all .3s cubic-bezier(.4,0,.2,1);position:absolute;bottom:-18px;transform:translateY(10px)}.sidebar-item:hover{background:var(--color-bg-elevated);color:var(--color-primary);transform:translateY(-2px);box-shadow:0 4px 12px #0000000d}.sidebar-item:hover span.icon-label{opacity:1;transform:translateY(0)}.sidebar-item.active{background:var(--color-primary-50);color:var(--color-primary);box-shadow:inset 0 0 0 1px var(--color-primary-100)}@media(max-width:768px){.top-nav,.top-nav .container{padding:0 4px}.nav-content{flex-flow:row;justify-content:space-between;align-items:center;gap:8px;height:auto;min-height:56px;padding:6px 0}.brand{flex-shrink:0;font-size:1.1rem}.brand span{margin-top:0;font-size:.7rem}.controls{flex-wrap:nowrap;justify-content:flex-end;gap:6px;padding-bottom:2px;display:flex;overflow-x:auto}.controls::-webkit-scrollbar{display:none}.nav-user-controls{border-left:none;flex-shrink:0;justify-content:flex-end;width:auto;margin-left:0;padding-left:0}.btn,.btn-primary,.btn-outline{white-space:nowrap;flex-shrink:0;padding:4px 10px;font-size:.75rem}.lecture-header h1{margin-bottom:.5rem;font-size:1.25rem;line-height:1.2}.nav-logo{height:32px!important}.role-label{display:none!important}.nav-user-badge{white-space:nowrap;flex-shrink:0;padding:4px 8px;font-size:.75rem}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-gradient-position{syntax:"*";inherits:false}@property --tw-gradient-from{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-via{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-to{syntax:"<color>";inherits:false;initial-value:#0000}@property --tw-gradient-stops{syntax:"*";inherits:false}@property --tw-gradient-via-stops{syntax:"*";inherits:false}@property --tw-gradient-from-position{syntax:"<length-percentage>";inherits:false;initial-value:0%}@property --tw-gradient-via-position{syntax:"<length-percentage>";inherits:false;initial-value:50%}@property --tw-gradient-to-position{syntax:"<length-percentage>";inherits:false;initial-value:100%}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-backdrop-blur{syntax:"*";inherits:false}@property --tw-backdrop-brightness{syntax:"*";inherits:false}@property --tw-backdrop-contrast{syntax:"*";inherits:false}@property --tw-backdrop-grayscale{syntax:"*";inherits:false}@property --tw-backdrop-hue-rotate{syntax:"*";inherits:false}@property --tw-backdrop-invert{syntax:"*";inherits:false}@property --tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}@property --tw-duration{syntax:"*";inherits:false}@property --tw-scale-x{syntax:"*";inherits:false;initial-value:1}@property --tw-scale-y{syntax:"*";inherits:false;initial-value:1}@property --tw-scale-z{syntax:"*";inherits:false;initial-value:1}@keyframes spin{to{transform:rotate(360deg)}}@keyframes pulse{50%{opacity:.5}}@keyframes bounce{0%,to{animation-timing-function:cubic-bezier(.8,0,1,1);transform:translateY(-25%)}50%{animation-timing-function:cubic-bezier(0,0,.2,1);transform:none}}:root{--blue: #2563eb;--blue-dark: #1d4ed8;--blue-light: #60a5fa;--blue-50: #eff6ff;--violet: #8b5cf6;--violet-dark: #7c3aed;--violet-light: #a78bfa;--violet-50: #f5f3ff;--emerald: #10b981;--emerald-dark: #059669;--emerald-light: #34d399;--emerald-50: #ecfdf5;--rose: #f43f5e;--rose-dark: #e11d48;--rose-light: #fb7185;--rose-50: #fff1f2;--amber: #f59e0b;--amber-dark: #d97706;--amber-light: #fbbf24;--amber-50: #fffbeb;--cyan: #06b6d4;--cyan-dark: #0891b2;--cyan-light: #22d3ee;--cyan-50: #ecfeff;--radius-sm: 8px;--radius-md: 14px;--radius-lg: 20px;--radius-xl: 28px;--radius-full: 9999px;--font-sans: "Inter", system-ui, -apple-system, sans-serif;--font-display: "Outfit", "Inter", sans-serif;--transition: all .35s cubic-bezier(.4, 0, .2, 1);--transition-fast: all .2s cubic-bezier(.4, 0, .2, 1);--transition-spring: all .5s cubic-bezier(.34, 1.56, .64, 1);--transition-3d: transform .4s cubic-bezier(.25, .46, .45, .94), box-shadow .4s ease}body,[data-theme=classic-white]{--color-primary: var(--blue);--color-primary-dark: var(--blue-dark);--color-primary-light: var(--blue-light);--color-primary-50: var(--blue-50);--color-primary-100: #dbeafe;--color-bg: #f8fafc;--color-bg-light: #f1f5f9;--color-surface: #ffffff;--color-text-main: #0f172a;--color-text-secondary: #475569;--color-text-muted: #94a3b8;--color-border: #e2e8f0;--color-border-light: #f1f5f9;--glass-bg: rgba(255, 255, 255, .75);--glass-border: rgba(226, 232, 240, .6);--glass-shadow: 0 8px 32px rgba(0, 0, 0, .06);--glass-blur: blur(20px) saturate(180%);--depth-1: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);--depth-2: 0 8px 25px rgba(0,0,0,.08), 0 0 1px rgba(0,0,0,.05);--depth-3: 0 16px 40px rgba(0,0,0,.1), 0 0 1px rgba(0,0,0,.05);--depth-4: 0 24px 60px rgba(0,0,0,.12);--depth-glow-blue: 0 0 30px rgba(37,99,235,.12);--depth-glow-violet: 0 0 30px rgba(139,92,246,.12);--depth-glow-emerald: 0 0 30px rgba(16,185,129,.12);--depth-glow-rose: 0 0 30px rgba(244,63,94,.12);--depth-glow-amber: 0 0 30px rgba(245,158,11,.12);--depth-glow-cyan: 0 0 30px rgba(6,182,212,.12);--shadow-sm: var(--depth-1);--shadow-md: var(--depth-2);--shadow-lg: var(--depth-3);--shadow-xl: var(--depth-4);--shadow-primary: 0 4px 14px rgba(37,99,235,.25);--nav-bg: rgba(255, 255, 255, .88);--nav-border: rgba(226, 232, 240, .6);--nav-shadow: 0 1px 3px rgba(0, 0, 0, .04);--card-img-opacity: 0;--body-bg-image: none;--body-overlay: transparent;--input-bg: rgba(241, 245, 249, .7);--input-bg-focus: #ffffff;--logo-filter: none;--logo-blend: multiply}[data-theme=dark-galaxy]{--color-primary: var(--blue);--color-primary-dark: var(--blue-dark);--color-primary-light: var(--blue-light);--color-primary-50: rgba(37,99,235,.1);--color-primary-100: rgba(37,99,235,.15);--color-bg: #0f172a;--color-bg-light: #1e293b;--color-surface: rgba(30, 41, 59, .8);--color-text-main: #f1f5f9;--color-text-secondary: #cbd5e1;--color-text-muted: #64748b;--color-border: rgba(100, 116, 139, .25);--color-border-light: rgba(100, 116, 139, .15);--glass-bg: rgba(30, 41, 59, .6);--glass-border: rgba(148, 163, 184, .12);--glass-shadow: 0 8px 32px rgba(0, 0, 0, .3);--glass-blur: blur(24px) saturate(180%);--depth-1: 0 1px 3px rgba(0,0,0,.2), 0 1px 2px rgba(0,0,0,.15);--depth-2: 0 8px 30px rgba(0,0,0,.25);--depth-3: 0 16px 50px rgba(0,0,0,.3);--depth-4: 0 30px 70px rgba(0,0,0,.35);--depth-glow-blue: 0 0 40px rgba(37,99,235,.2);--depth-glow-violet: 0 0 40px rgba(139,92,246,.2);--depth-glow-emerald: 0 0 40px rgba(16,185,129,.2);--depth-glow-rose: 0 0 40px rgba(244,63,94,.2);--depth-glow-amber: 0 0 40px rgba(245,158,11,.2);--depth-glow-cyan: 0 0 40px rgba(6,182,212,.2);--shadow-sm: var(--depth-1);--shadow-md: var(--depth-2);--shadow-lg: var(--depth-3);--shadow-xl: var(--depth-4);--shadow-primary: 0 4px 14px rgba(37,99,235,.35);--nav-bg: rgba(15, 23, 42, .7);--nav-border: rgba(148, 163, 184, .1);--nav-shadow: 0 4px 20px rgba(0, 0, 0, .2);--card-img-opacity: .1;--body-bg-image: url(/images/dashboard_bg.png);--body-overlay: rgba(15, 23, 42, .55);--input-bg: rgba(30, 41, 59, .6);--input-bg-focus: rgba(30, 41, 59, .9);--logo-filter: invert(1) hue-rotate(180deg) brightness(1.2);--logo-blend: screen}[data-theme=ocean-blue]{--color-primary: #0ea5e9;--color-primary-dark: #0284c7;--color-primary-light: #38bdf8;--color-primary-50: rgba(14,165,233,.1);--color-primary-100: rgba(14,165,233,.15);--color-bg: #082f49;--color-bg-light: #0c4a6e;--color-surface: rgba(12, 74, 110, .7);--color-text-main: #e0f2fe;--color-text-secondary: #bae6fd;--color-text-muted: #7dd3fc;--color-border: rgba(56, 189, 248, .15);--color-border-light: rgba(56, 189, 248, .08);--glass-bg: rgba(12, 74, 110, .5);--glass-border: rgba(56, 189, 248, .1);--glass-shadow: 0 8px 32px rgba(0, 0, 0, .2);--glass-blur: blur(24px) saturate(180%);--depth-1: 0 1px 3px rgba(0,0,0,.15);--depth-2: 0 8px 30px rgba(0,0,0,.2);--depth-3: 0 16px 50px rgba(0,0,0,.25);--depth-4: 0 30px 70px rgba(0,0,0,.3);--depth-glow-blue: 0 0 40px rgba(14,165,233,.2);--depth-glow-violet: 0 0 40px rgba(139,92,246,.15);--depth-glow-emerald: 0 0 40px rgba(16,185,129,.15);--depth-glow-rose: 0 0 40px rgba(244,63,94,.15);--depth-glow-amber: 0 0 40px rgba(245,158,11,.15);--depth-glow-cyan: 0 0 40px rgba(6,182,212,.2);--shadow-sm: var(--depth-1);--shadow-md: var(--depth-2);--shadow-lg: var(--depth-3);--shadow-xl: var(--depth-4);--shadow-primary: 0 4px 14px rgba(14,165,233,.35);--nav-bg: rgba(8, 47, 73, .8);--nav-border: rgba(56, 189, 248, .1);--nav-shadow: 0 4px 20px rgba(0, 0, 0, .15);--card-img-opacity: .08;--body-bg-image: none;--body-overlay: transparent;--input-bg: rgba(8, 47, 73, .6);--input-bg-focus: rgba(8, 47, 73, .9);--logo-filter: invert(1) hue-rotate(180deg) brightness(1.2);--logo-blend: screen}[data-theme=forest-green]{--color-primary: #16a34a;--color-primary-dark: #15803d;--color-primary-light: #4ade80;--color-primary-50: rgba(22,163,74,.1);--color-primary-100: rgba(22,163,74,.15);--color-bg: #14532d;--color-bg-light: #166534;--color-surface: rgba(22, 101, 52, .7);--color-text-main: #f0fdf4;--color-text-secondary: #bbf7d0;--color-text-muted: #86efac;--color-border: rgba(74, 222, 128, .15);--color-border-light: rgba(74, 222, 128, .08);--glass-bg: rgba(22, 101, 52, .5);--glass-border: rgba(74, 222, 128, .1);--glass-shadow: 0 8px 32px rgba(0, 0, 0, .2);--glass-blur: blur(24px) saturate(180%);--depth-1: 0 1px 3px rgba(0,0,0,.15);--depth-2: 0 8px 30px rgba(0,0,0,.2);--depth-3: 0 16px 50px rgba(0,0,0,.25);--depth-4: 0 30px 70px rgba(0,0,0,.3);--depth-glow-blue: 0 0 40px rgba(37,99,235,.12);--depth-glow-violet: 0 0 40px rgba(139,92,246,.12);--depth-glow-emerald: 0 0 40px rgba(22,163,74,.25);--depth-glow-rose: 0 0 40px rgba(244,63,94,.12);--depth-glow-amber: 0 0 40px rgba(245,158,11,.12);--depth-glow-cyan: 0 0 40px rgba(6,182,212,.12);--shadow-sm: var(--depth-1);--shadow-md: var(--depth-2);--shadow-lg: var(--depth-3);--shadow-xl: var(--depth-4);--shadow-primary: 0 4px 14px rgba(22,163,74,.35);--nav-bg: rgba(20, 83, 45, .8);--nav-border: rgba(74, 222, 128, .1);--nav-shadow: 0 4px 20px rgba(0, 0, 0, .15);--card-img-opacity: .06;--body-bg-image: none;--body-overlay: transparent;--input-bg: rgba(20, 83, 45, .6);--input-bg-focus: rgba(20, 83, 45, .9);--logo-filter: invert(1) hue-rotate(180deg) brightness(1.2);--logo-blend: screen}[data-theme=sunset-warm]{--color-primary: #f59e0b;--color-primary-dark: #d97706;--color-primary-light: #fbbf24;--color-primary-50: rgba(245,158,11,.1);--color-primary-100: rgba(245,158,11,.15);--color-bg: #451a03;--color-bg-light: #78350f;--color-surface: rgba(120, 53, 15, .7);--color-text-main: #fef3c7;--color-text-secondary: #fde68a;--color-text-muted: #fbbf24;--color-border: rgba(251, 191, 36, .15);--color-border-light: rgba(251, 191, 36, .08);--glass-bg: rgba(120, 53, 15, .5);--glass-border: rgba(251, 191, 36, .1);--glass-shadow: 0 8px 32px rgba(0, 0, 0, .2);--glass-blur: blur(24px) saturate(180%);--depth-1: 0 1px 3px rgba(0,0,0,.15);--depth-2: 0 8px 30px rgba(0,0,0,.2);--depth-3: 0 16px 50px rgba(0,0,0,.25);--depth-4: 0 30px 70px rgba(0,0,0,.3);--depth-glow-blue: 0 0 40px rgba(37,99,235,.12);--depth-glow-violet: 0 0 40px rgba(139,92,246,.12);--depth-glow-emerald: 0 0 40px rgba(16,185,129,.12);--depth-glow-rose: 0 0 40px rgba(244,63,94,.2);--depth-glow-amber: 0 0 40px rgba(245,158,11,.25);--depth-glow-cyan: 0 0 40px rgba(6,182,212,.12);--shadow-sm: var(--depth-1);--shadow-md: var(--depth-2);--shadow-lg: var(--depth-3);--shadow-xl: var(--depth-4);--shadow-primary: 0 4px 14px rgba(245,158,11,.35);--nav-bg: rgba(69, 26, 3, .8);--nav-border: rgba(251, 191, 36, .1);--nav-shadow: 0 4px 20px rgba(0, 0, 0, .15);--card-img-opacity: .06;--body-bg-image: none;--body-overlay: transparent;--input-bg: rgba(69, 26, 3, .6);--input-bg-focus: rgba(69, 26, 3, .9);--logo-filter: invert(1) hue-rotate(180deg) brightness(1.2);--logo-blend: screen}body{margin:0;font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text-main);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-image:var(--body-bg-image);background-size:cover;background-position:center;background-attachment:fixed;background-repeat:no-repeat;min-height:100vh;transition:background-color .5s ease,color .3s ease}[data-theme=dark-galaxy] body:before,body[data-theme=dark-galaxy]:before{content:"";position:fixed;inset:0;background:var(--body-overlay);z-index:0;pointer-events:none}#root{position:relative;z-index:1}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:700;line-height:1.2;color:var(--color-text-main)}.lecture-content-area,.lecture-view-content{--color-text-main: #0f172a;--color-text-secondary: #334155;--color-text-muted: #64748b;--color-border: #e2e8f0;background:#fff!important;color:var(--color-text-main);border-radius:var(--radius-lg);padding:2rem;box-shadow:var(--depth-2);position:relative;z-index:1}.lecture-content-area .block-label,.lecture-view-content .block-label{color:#fff!important}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInScale{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes pulse-glow{0%,to{box-shadow:0 0 #2563eb4d}50%{box-shadow:0 0 20px 5px #2563eb26}}@keyframes gradient-shift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}@keyframes slideInRight{0%{opacity:0;transform:translate(-15px)}to{opacity:1;transform:translate(0)}}.container{max-width:1100px;margin:0 auto;padding:0 1.25rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:.5rem 1.2rem;border-radius:var(--radius-md);font-family:var(--font-sans);font-weight:600;font-size:.9rem;cursor:pointer;border:none;transition:var(--transition);text-decoration:none;line-height:1}.btn-primary{background:linear-gradient(135deg,var(--color-primary),var(--violet));color:#fff;box-shadow:var(--shadow-primary)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px #2563eb66}.btn-outline{background:transparent;color:var(--color-text-secondary);border:1.5px solid var(--color-border)}.btn-outline:hover{border-color:var(--color-primary);color:var(--color-primary-light);background:#2563eb0f;transform:translateY(-1px)}.hidden-student{display:none}[data-role=teacher] .hidden-student{display:block}.selection-container{padding:2rem 1rem;max-width:1100px;margin:0 auto;animation:fadeInUp .6s ease both}.selection-header{text-align:center;margin-bottom:3rem;animation:fadeInUp .5s ease both}.selection-header h1{font-family:var(--font-display);font-size:2.4rem;font-weight:800;margin-bottom:8px;letter-spacing:-.03em;background:linear-gradient(135deg,var(--blue-light),var(--violet),var(--rose-light));background-size:200% auto;animation:gradient-shift 4s ease infinite;background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.selection-header p{color:var(--color-text-muted);font-size:1rem;font-weight:500}.selection-label{display:inline-flex;align-items:center;gap:6px;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--cyan-light);margin-bottom:12px}.selection-label-dot{width:8px;height:8px;border-radius:50%;background:var(--cyan);animation:pulse-glow 2s infinite}.back-link{background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);color:var(--cyan-light);font-size:.85rem;font-weight:600;cursor:pointer;padding:8px 20px;border-radius:var(--radius-full);transition:var(--transition);display:inline-flex;align-items:center;gap:6px;font-family:var(--font-sans);box-shadow:var(--depth-1)}.back-link:hover{background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;border-color:transparent;transform:translate(-3px) scale(1.02);box-shadow:var(--depth-glow-cyan)}.selection-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}.selection-card{background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-xl);padding:32px 28px;text-align:center;cursor:pointer;transition:var(--transition-3d);position:relative;overflow:hidden;transform:perspective(800px) rotateX(0) rotateY(0);transform-style:preserve-3d;box-shadow:var(--depth-2);animation:fadeInScale .5s ease both}.selection-card:after{content:"";position:absolute;inset:0;background-image:url(/images/card_bg_blue.png);background-size:cover;background-position:center;opacity:.12;z-index:0;transition:opacity .5s ease;pointer-events:none}.selection-card:hover:after{opacity:.22}.selection-card>*{position:relative;z-index:1}.selection-card:nth-child(6n+1){border-bottom:3px solid var(--blue)}.selection-card:nth-child(6n+1):hover{box-shadow:var(--depth-4),var(--depth-glow-blue)}.selection-card:nth-child(6n+1):after{background-image:url(/images/card_bg_blue.png)}.selection-card:nth-child(6n+2){border-bottom:3px solid var(--violet)}.selection-card:nth-child(6n+2):hover{box-shadow:var(--depth-4),var(--depth-glow-violet)}.selection-card:nth-child(6n+2):after{background-image:url(/images/card_bg_warm.png)}.selection-card:nth-child(6n+3){border-bottom:3px solid var(--emerald)}.selection-card:nth-child(6n+3):hover{box-shadow:var(--depth-4),var(--depth-glow-emerald)}.selection-card:nth-child(6n+3):after{background-image:url(/images/card_bg_green.png)}.selection-card:nth-child(6n+4){border-bottom:3px solid var(--rose)}.selection-card:nth-child(6n+4):hover{box-shadow:var(--depth-4),var(--depth-glow-rose)}.selection-card:nth-child(6n+4):after{background-image:url(/images/card_bg_warm.png)}.selection-card:nth-child(6n+5){border-bottom:3px solid var(--amber)}.selection-card:nth-child(6n+5):hover{box-shadow:var(--depth-4),var(--depth-glow-amber)}.selection-card:nth-child(6n+5):after{background-image:url(/images/card_bg_blue.png)}.selection-card:nth-child(6n){border-bottom:3px solid var(--cyan)}.selection-card:nth-child(6n):hover{box-shadow:var(--depth-4),var(--depth-glow-cyan)}.selection-card:nth-child(6n):after{background-image:url(/images/card_bg_green.png)}.selection-card:nth-child(1){animation-delay:.05s}.selection-card:nth-child(2){animation-delay:.1s}.selection-card:nth-child(3){animation-delay:.15s}.selection-card:nth-child(4){animation-delay:.2s}.selection-card:nth-child(5){animation-delay:.25s}.selection-card:nth-child(6){animation-delay:.3s}.selection-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--blue),var(--violet),var(--rose),var(--amber),var(--emerald),var(--cyan));background-size:300% 100%;transform:scaleX(0);transform-origin:left;transition:transform .5s ease;z-index:2}.selection-card:hover{transform:perspective(800px) rotateX(-3deg) rotateY(3deg) translateY(-10px)}.selection-card:hover:before{transform:scaleX(1);animation:gradient-shift 3s ease infinite}.selection-icon{width:68px;height:68px;margin:0 auto 16px;border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;font-size:1.8rem;transition:var(--transition-spring)}.selection-card:nth-child(6n+1) .selection-icon{background:linear-gradient(135deg,#2563eb33,#06b6d426);box-shadow:0 4px 12px #2563eb26}.selection-card:nth-child(6n+2) .selection-icon{background:linear-gradient(135deg,#8b5cf633,#f43f5e26);box-shadow:0 4px 12px #8b5cf626}.selection-card:nth-child(6n+3) .selection-icon{background:linear-gradient(135deg,#10b98133,#06b6d426);box-shadow:0 4px 12px #10b98126}.selection-card:nth-child(6n+4) .selection-icon{background:linear-gradient(135deg,#f43f5e33,#f59e0b26);box-shadow:0 4px 12px #f43f5e26}.selection-card:nth-child(6n+5) .selection-icon{background:linear-gradient(135deg,#f59e0b33,#f43f5e26);box-shadow:0 4px 12px #f59e0b26}.selection-card:nth-child(6n) .selection-icon{background:linear-gradient(135deg,#06b6d433,#2563eb26);box-shadow:0 4px 12px #06b6d426}.selection-card:hover .selection-icon{transform:scale(1.15) rotate(5deg) translateZ(20px)}.selection-card h3{font-family:var(--font-display);font-size:1.25rem;font-weight:700;margin-bottom:8px;color:var(--color-text-main);transition:color .3s}.selection-card:nth-child(6n+1):hover h3{color:var(--blue-light)}.selection-card:nth-child(6n+2):hover h3{color:var(--violet-light)}.selection-card:nth-child(6n+3):hover h3{color:var(--emerald-light)}.selection-card:nth-child(6n+4):hover h3{color:var(--rose-light)}.selection-card:nth-child(6n+5):hover h3{color:var(--amber-light)}.selection-card:nth-child(6n):hover h3{color:var(--cyan-light)}.selection-card p{color:var(--color-text-muted);font-size:.9rem;line-height:1.5}.institution-badge{display:inline-flex;align-items:center;gap:4px;margin-top:16px;padding:5px 14px;border-radius:var(--radius-full);font-size:.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;background:linear-gradient(135deg,#2563eb1f,#8b5cf61f);color:var(--blue-light);border:1px solid rgba(37,99,235,.2)}.stream-count-badge{display:inline-flex;align-items:center;gap:4px;margin-top:12px;padding:5px 14px;border-radius:var(--radius-full);font-size:.75rem;font-weight:600;background:#64748b26;color:var(--color-text-secondary);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.admin-controls-floating{position:absolute;top:12px;right:12px;display:flex;gap:6px;z-index:20}.admin-icon-btn{width:36px;height:36px;border-radius:var(--radius-md);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:var(--depth-1);transition:var(--transition-spring);font-size:.9rem;background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.admin-icon-btn:hover{transform:scale(1.15) rotate(5deg);box-shadow:var(--depth-3)}.edit-btn{color:var(--cyan-light);border:1px solid rgba(6,182,212,.2)}.edit-btn:hover{background:#06b6d41a}.delete-btn{color:var(--rose-light);border:1px solid rgba(244,63,94,.2)}.delete-btn:hover{background:#f43f5e1a}.stream-card{padding:0;overflow:hidden;text-align:left}.stream-thumbnail{height:160px;background-size:cover;background-position:center;background-color:var(--color-bg-light);position:relative;transition:transform .5s ease}.stream-card:hover .stream-thumbnail{transform:scale(1.05)}.stream-thumbnail:after{content:"";position:absolute;bottom:0;left:0;right:0;height:60%;background:linear-gradient(to top,rgba(15,23,42,.7),transparent)}.stream-info{padding:20px 24px}.stream-info h3,.stream-info p{text-align:left}.add-card{border:2px dashed var(--color-border);background:#1e293b4d;display:flex;flex-direction:column;justify-content:center;align-items:center;cursor:pointer;opacity:.6;transition:var(--transition-spring);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.add-card:hover{opacity:1;border-color:var(--violet);background:#8b5cf60f;transform:perspective(800px) rotateX(-2deg) translateY(-8px)!important;box-shadow:var(--depth-glow-violet)}.add-card-icon{width:56px;height:56px;border-radius:50%;background:linear-gradient(135deg,#8b5cf626,#f43f5e1a);display:flex;align-items:center;justify-content:center;margin-bottom:12px;color:var(--violet-light);font-size:1.5rem;transition:var(--transition-spring)}.add-card:hover .add-card-icon{background:linear-gradient(135deg,var(--violet),var(--rose));color:#fff;transform:rotate(180deg) scale(1.1);box-shadow:0 8px 20px #8b5cf64d}.add-card h3{color:var(--color-text-muted);font-size:1rem}@media(max-width:768px){.selection-container{padding:1rem .75rem}.selection-header{margin-bottom:2rem}.selection-header h1{font-size:1.5rem;padding-top:8px}.selection-grid{grid-template-columns:1fr;gap:16px}.back-link{position:relative;left:auto;top:auto;display:inline-flex;margin-bottom:12px}.selection-card{padding:24px 20px}}.swipe-indicator{position:fixed;top:50%;left:0;width:50px;height:50px;background-color:#3b82f6e6;border-radius:50%;display:flex;justify-content:center;align-items:center;color:#fff;font-size:24px;box-shadow:0 4px 6px #0000001a;transform:translateY(-50%) translate(-120%);transition:transform .1s ease-out,opacity .2s;z-index:100000;pointer-events:none}.swipe-indicator.visible{opacity:1}.dashboard-container{max-width:1100px;margin:0 auto;padding:0 1rem;animation:fadeInUp .5s ease both}.dashboard-header{text-align:center;margin-bottom:3rem;padding:1.5rem 0;animation:fadeInUp .4s ease both}.dashboard-header h1{font-family:var(--font-display);font-size:2.4rem;font-weight:800;margin-bottom:8px;background:linear-gradient(135deg,var(--emerald-light),var(--cyan-light),var(--blue-light));background-size:200% auto;animation:gradient-shift 4s ease infinite;background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.03em}.dashboard-header p{font-size:1.05rem;color:var(--color-text-muted);font-weight:500}.lecture-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}.lecture-card{background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-xl);cursor:pointer;transition:var(--transition-3d);display:flex;flex-direction:column;position:relative;overflow:hidden;transform:perspective(800px) rotateX(0) rotateY(0);transform-style:preserve-3d;box-shadow:var(--depth-2);animation:fadeInScale .5s ease 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.card-image{transform:scale(1.04)}.card-image:after{content:"";position:absolute;bottom:0;left:0;right:0;height:60%;background:linear-gradient(to top,rgba(15,23,42,.7),transparent)}.card-number{font-family:var(--font-display);font-size:.75rem;font-weight:800;color:#fff;position:absolute;top:12px;right:12px;padding:5px 14px;border-radius:var(--radius-full);letter-spacing:.06em;z-index:2;opacity:1;line-height:1.4;transition:var(--transition-spring)}.lecture-card:nth-child(5n+1) .card-number{background:linear-gradient(135deg,var(--cyan),var(--blue));box-shadow:0 4px 12px #06b6d459}.lecture-card:nth-child(5n+2) .card-number{background:linear-gradient(135deg,var(--violet),var(--rose));box-shadow:0 4px 12px #8b5cf659}.lecture-card:nth-child(5n+3) .card-number{background:linear-gradient(135deg,var(--rose),var(--amber));box-shadow:0 4px 12px #f43f5e59}.lecture-card:nth-child(5n+4) .card-number{background:linear-gradient(135deg,var(--emerald),var(--cyan));box-shadow:0 4px 12px 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var(--color-border);letter-spacing:.05em}.resource-pills{display:flex;gap:6px}.pill{width:30px;height:30px;display:flex;align-items:center;justify-content:center;border-radius:50%;color:#fff;transition:transform .2s cubic-bezier(.34,1.56,.64,1),box-shadow .2s;text-decoration:none}.pill:hover{transform:translateY(-3px) scale(1.1);box-shadow:0 5px 12px #00000026;color:#fff}.quiz-pill{background:linear-gradient(135deg,#10b981,#059669)}.ppt-pill{background:linear-gradient(135deg,#f59e0b,#d97706)}.pdf-pill{background:linear-gradient(135deg,#ef4444,#dc2626)}.action-buttons{display:flex;gap:8px;margin-left:auto}.action-btn{display:flex;align-items:center;gap:6px;padding:6px 12px;font-size:.8rem;font-weight:600;background:#8b5cf614;color:var(--violet);border:1px solid rgba(139,92,246,.2);border-radius:var(--radius-sm);cursor:pointer;transition:all .2s}.action-btn:hover{background:var(--violet);color:#fff;transform:translateY(-2px);box-shadow:0 4px 10px #8b5cf633}.teacher-edit-mode{background:var(--color-surface, rgba(255,255,255,.8));border:1px solid var(--color-border);border-radius:var(--radius-md);padding:1.25rem;box-shadow:inset 0 2px 4px #00000005;animation:slideDown .2s ease-out}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.edit-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.edit-header h5{margin:0;font-size:.95rem;color:var(--color-text-main);font-weight:700}.close-btn{background:#0000000d;border:none;color:var(--color-text-muted);cursor:pointer;width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .2s}.close-btn:hover{background:#ef44441a;color:#ef4444;transform:scale(1.1) rotate(90deg)}.edit-form-row{display:flex;flex-direction:column;gap:12px;margin-bottom:1rem}.input-group{position:relative;display:flex;align-items:center}.input-icon{position:absolute;left:12px;opacity:.8}.quiz-color{color:#10b981}.ppt-color{color:#f59e0b}.pdf-color{color:#ef4444}.input-group input{width:100%;padding:10px 10px 10px 38px;border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text-main);font-size:.85rem;font-family:monospace;transition:all .2s}.input-group input:focus{outline:none;border-color:var(--violet);box-shadow:0 0 0 3px #8b5cf61a}.save-panel-btn{width:100%;display:flex;align-items:center;justify-content:center;gap:8px;padding:12px;background:linear-gradient(135deg,var(--emerald),var(--cyan));color:#fff;border:none;border-radius:var(--radius-sm);font-weight:700;cursor:pointer;transition:all .2s;letter-spacing:.02em}.save-panel-btn:hover{transform:translateY(-2px);box-shadow:0 6px 15px #10b9814d}@media(max-width:600px){.teacher-action-bar{flex-direction:column;align-items:flex-start}.action-buttons{margin-left:0;width:100%}.action-buttons .action-btn{flex:1;justify-content:center}}.modal-overlay{position:fixed;inset:0;background:#0009;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:flex;justify-content:center;align-items:center;z-index:1000;animation:fadeIn .2s ease-out}.modal-content{background:var(--color-surface, #ffffff);border-radius:var(--radius-xl);padding:2.5rem;width:90%;max-width:600px;position:relative;box-shadow:0 10px 40px #0003;max-height:90vh;overflow-y:auto}.modal-overlay.login-overlay{position:fixed;inset:0;background:#000000b3;backdrop-filter:blur(20px) saturate(160%);-webkit-backdrop-filter:blur(20px) saturate(160%);display:flex;justify-content:center;align-items:center;z-index:9999;perspective:1200px;animation:fadeIn .4s ease-out}.login-3d-wrapper{position:relative;width:100%;max-width:440px;animation:float3D 6s ease-in-out 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