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4)}.text-center{text-align:center}.text-right{text-align:right}.font-mono{font-family:var(--font-mono)}.text-2xl{font-size:var(--text-2xl);line-height:var(--tw-leading,var(--text-2xl--line-height))}.text-4xl{font-size:var(--text-4xl);line-height:var(--tw-leading,var(--text-4xl--line-height))}.text-base{font-size:var(--text-base);line-height:var(--tw-leading,var(--text-base--line-height))}.text-lg{font-size:var(--text-lg);line-height:var(--tw-leading,var(--text-lg--line-height))}.text-sm{font-size:var(--text-sm);line-height:var(--tw-leading,var(--text-sm--line-height))}.text-xl{font-size:var(--text-xl);line-height:var(--tw-leading,var(--text-xl--line-height))}.text-xs{font-size:var(--text-xs);line-height:var(--tw-leading,var(--text-xs--line-height))}.text-\[10px\]{font-size:10px}.text-\[11px\]{font-size:11px}.leading-none{--tw-leading:1;line-height:1}.leading-relaxed{--tw-leading:var(--leading-relaxed);line-height:var(--leading-relaxed)}.leading-tight{--tw-leading:var(--leading-tight);line-height:var(--leading-tight)}.font-bold{--tw-font-weight:var(--font-weight-bold);font-weight:var(--font-weight-bold)}.font-extrabold{--tw-font-weight:var(--font-weight-extrabold);font-weight:var(--font-weight-extrabold)}.font-medium{--tw-font-weight:var(--font-weight-medium);font-weight:var(--font-weight-medium)}.font-normal{--tw-font-weight:var(--font-weight-normal);font-weight:var(--font-weight-normal)}.font-semibold{--tw-font-weight:var(--font-weight-semibold);font-weight:var(--font-weight-semibold)}.tracking-tight{--tw-tracking:var(--tracking-tight);letter-spacing:var(--tracking-tight)}.tracking-widest{--tw-tracking:var(--tracking-widest);letter-spacing:var(--tracking-widest)}.whitespace-nowrap{white-space:nowrap}.text-blue-300{color:var(--color-blue-300)}.text-blue-400{color:var(--color-blue-400)}.text-green-400{color:var(--color-green-400)}.text-neutral-400{color:var(--color-neutral-400)}.text-neutral-500{color:var(--color-neutral-500)}.text-purple-400{color:var(--color-purple-400)}.text-red-300{color:var(--color-red-300)}.text-red-400{color:var(--color-red-400)}.text-slate-100{color:var(--color-slate-100)}.text-slate-200{color:var(--color-slate-200)}.text-slate-300{color:var(--color-slate-300)}.text-slate-400{color:var(--color-slate-400)}.text-slate-500{color:var(--color-slate-500)}.text-transparent{color:#0000}.text-white{color:var(--color-white)}.text-white\/80{color:#fffc}@supports (color:color-mix(in lab,red,red)){.text-white\/80{color:color-mix(in oklab,var(--color-white) 80%,transparent)}}.text-yellow-300{color:var(--color-yellow-300)}.text-yellow-400{color:var(--color-yellow-400)}.capitalize{text-transform:capitalize}.uppercase{text-transform:uppercase}.italic{font-style:italic}.opacity-0{opacity:0}.opacity-20{opacity:.2}.opacity-75{opacity:.75}.shadow-2xl{--tw-shadow:0 25px 50px -12px var(--tw-shadow-color,#00000040);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.shadow-\[0_0_15px_rgba\(59\,130\,246\,0\.8\)\]{--tw-shadow:0 0 15px var(--tw-shadow-color,#3b82f6cc);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.shadow-sm{--tw-shadow:0 1px 3px 0 var(--tw-shadow-color,#0000001a), 0 1px 2px -1px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.shadow-xl{--tw-shadow:0 20px 25px -5px var(--tw-shadow-color,#0000001a), 0 8px 10px -6px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.outline{outline-style:var(--tw-outline-style);outline-width:1px}.filter{filter:var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,)}.backdrop-blur{--tw-backdrop-blur:blur(8px);-webkit-backdrop-filter:var(--tw-backdrop-blur,) var(--tw-backdrop-brightness,) var(--tw-backdrop-contrast,) var(--tw-backdrop-grayscale,) var(--tw-backdrop-hue-rotate,) var(--tw-backdrop-invert,) var(--tw-backdrop-opacity,) var(--tw-backdrop-saturate,) var(--tw-backdrop-sepia,);backdrop-filter:var(--tw-backdrop-blur,) var(--tw-backdrop-brightness,) var(--tw-backdrop-contrast,) var(--tw-backdrop-grayscale,) var(--tw-backdrop-hue-rotate,) var(--tw-backdrop-invert,) var(--tw-backdrop-opacity,) var(--tw-backdrop-saturate,) var(--tw-backdrop-sepia,)}.backdrop-blur-lg{--tw-backdrop-blur:blur(var(--blur-lg));-webkit-backdrop-filter:var(--tw-backdrop-blur,) var(--tw-backdrop-brightness,) var(--tw-backdrop-contrast,) var(--tw-backdrop-grayscale,) var(--tw-backdrop-hue-rotate,) var(--tw-backdrop-invert,) var(--tw-backdrop-opacity,) var(--tw-backdrop-saturate,) var(--tw-backdrop-sepia,);backdrop-filter:var(--tw-backdrop-blur,) var(--tw-backdrop-brightness,) var(--tw-backdrop-contrast,) var(--tw-backdrop-grayscale,) var(--tw-backdrop-hue-rotate,) var(--tw-backdrop-invert,) var(--tw-backdrop-opacity,) var(--tw-backdrop-saturate,) var(--tw-backdrop-sepia,)}.backdrop-blur-md{--tw-backdrop-blur:blur(var(--blur-md));-webkit-backdrop-filter:var(--tw-backdrop-blur,) var(--tw-backdrop-brightness,) var(--tw-backdrop-contrast,) var(--tw-backdrop-grayscale,) var(--tw-backdrop-hue-rotate,) var(--tw-backdrop-invert,) var(--tw-backdrop-opacity,) var(--tw-backdrop-saturate,) var(--tw-backdrop-sepia,);backdrop-filter:var(--tw-backdrop-blur,) var(--tw-backdrop-brightness,) var(--tw-backdrop-contrast,) var(--tw-backdrop-grayscale,) var(--tw-backdrop-hue-rotate,) var(--tw-backdrop-invert,) var(--tw-backdrop-opacity,) var(--tw-backdrop-saturate,) var(--tw-backdrop-sepia,)}.backdrop-blur-xl{--tw-backdrop-blur:blur(var(--blur-xl));-webkit-backdrop-filter:var(--tw-backdrop-blur,) var(--tw-backdrop-brightness,) var(--tw-backdrop-contrast,) var(--tw-backdrop-grayscale,) var(--tw-backdrop-hue-rotate,) var(--tw-backdrop-invert,) var(--tw-backdrop-opacity,) var(--tw-backdrop-saturate,) var(--tw-backdrop-sepia,);backdrop-filter:var(--tw-backdrop-blur,) var(--tw-backdrop-brightness,) var(--tw-backdrop-contrast,) var(--tw-backdrop-grayscale,) var(--tw-backdrop-hue-rotate,) var(--tw-backdrop-invert,) var(--tw-backdrop-opacity,) var(--tw-backdrop-saturate,) var(--tw-backdrop-sepia,)}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}.transition-all{transition-property:all;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}.duration-200{--tw-duration:.2s;transition-duration:.2s}.duration-300{--tw-duration:.3s;transition-duration:.3s}@media(hover:hover){.hover\:scale-105:hover{--tw-scale-x:105%;--tw-scale-y:105%;--tw-scale-z:105%;scale:var(--tw-scale-x) var(--tw-scale-y)}.hover\:scale-125:hover{--tw-scale-x:125%;--tw-scale-y:125%;--tw-scale-z:125%;scale:var(--tw-scale-x) var(--tw-scale-y)}.hover\:border-white\/40:hover{border-color:#fff6}@supports (color:color-mix(in lab,red,red)){.hover\:border-white\/40:hover{border-color:color-mix(in oklab,var(--color-white) 40%,transparent)}}.hover\:bg-black\/60:hover{background-color:#0009}@supports (color:color-mix(in lab,red,red)){.hover\:bg-black\/60:hover{background-color:color-mix(in oklab,var(--color-black) 60%,transparent)}}.hover\:bg-blue-500:hover{background-color:var(--color-blue-500)}.hover\:bg-white:hover{background-color:var(--color-white)}.hover\:text-white:hover{color:var(--color-white)}.hover\:shadow-\[0_0_20px_rgba\(59\,130\,246\,0\.5\)\]:hover{--tw-shadow:0 0 20px var(--tw-shadow-color,#3b82f680);box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}}.active\:cursor-grabbing:active{cursor:grabbing}@media(min-width:48rem){.md\:-top-20{top:calc(var(--spacing) * -20)}.md\:left-60{left:calc(var(--spacing) * 60)}.md\:block{display:block}.md\:p-16{padding:calc(var(--spacing) * 16)}.md\:text-6xl{font-size:var(--text-6xl);line-height:var(--tw-leading,var(--text-6xl--line-height))}}@media(min-width:64rem){.lg\:w-\[84\%\]{width:84%}}}[data-theme=warm-notebook]{--background:37 40% 93%;--foreground:0 0% 17%;--color-bg-main:#f5f0e8;--color-bg-elevated:#fffdf9;--color-bg-light:#fff9f0;--color-text-main:#2c2c2c;--color-text-muted:#595959;--color-text-secondary:#4a4a4a;--color-border:#2c2c2c;--color-primary:#c67b5c;--color-primary-light:#dca086;--color-primary-dark:#a55a3c;--color-primary-50:#c67b5c1a;--color-primary-100:#c67b5c33;--blue:#7a8fa6;--blue-light:#9cb2c9;--violet:#c9a0a0;--violet-light:#e4c0c0;--emerald:#8fa98a;--emerald-light:#afc9aa;--amber:#d4a843;--amber-light:#f5cd6a;--cyan:#8fa98a;--cyan-light:#afc9aa;--rose:#c9a0a0;--rose-light:#e4c0c0;--nav-bg:#f5f0e8f2;--nav-border:#2c2c2c26;--nav-shadow:0 2px 10px #0000000d;--glass-bg:#fffdf9;--glass-border:#2c2c2c;--glass-blur:blur(0px);--font-display:"Playfair Display", serif;--font-sans:"Inter", sans-serif;--font-handwritten:"Caveat", cursive;--depth-1:2px 2px 0px #2c2c2c;--depth-2:4px 4px 0px #2c2c2c;--depth-3:6px 6px 0px #2c2c2c;--depth-4:8px 8px 0px #2c2c2c;--depth-glow-blue:var(--depth-4);--depth-glow-violet:var(--depth-4);--depth-glow-emerald:var(--depth-4);--depth-glow-rose:var(--depth-4);--depth-glow-amber:var(--depth-4);--depth-glow-cyan:var(--depth-4);--radius-xl:4px;--radius-lg:4px;--radius-md:4px;--radius-full:20px}[data-theme=warm-notebook] body{background-color:var(--color-bg-main);color:var(--color-text-main);font-family:var(--font-sans);background-image:url('data:image/svg+xml,%3Csvg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg"%3E%3Cfilter id="noiseFilter"%3E%3CfeTurbulence type="fractalNoise" baseFrequency="0.65" numOctaves="3" stitchTiles="stitch"/%3E%3C/filter%3E%3Crect width="100%25" height="100%25" filter="url('%23noiseFilter')" opacity="0.04"/%3E%3C/svg%3E')}[data-theme=warm-notebook] h1,[data-theme=warm-notebook] h2,[data-theme=warm-notebook] h3{font-family:var(--font-display)}[data-theme=warm-notebook] .hand-drawn-underline{display:inline-block;position:relative}[data-theme=warm-notebook] .hand-drawn-underline:after{content:"";background-color:var(--color-primary);z-index:-1;opacity:.8;border-radius:50%/60% 60% 40% 40%;width:100%;height:6px;position:absolute;bottom:-4px;left:0;transform:rotate(-1deg)}[data-theme=warm-notebook] .brand{color:var(--color-text-main);-webkit-text-fill-color:var(--color-text-main);background:0 0}@keyframes spotlight{0%{opacity:0;transform:translate(-72%,-62%)scale(.5)}to{opacity:1;transform:translate(-50%,-40%)scale(1)}}.animate-spotlight{animation:2s .75s forwards spotlight}:root{--background:0 0% 100%;--foreground:222.2 84% 4.9%;--card:0 0% 100%;--card-foreground:222.2 84% 4.9%;--muted-foreground:215.4 16.3% 46.9%}.top-nav{background:var(--nav-bg,#ffffffe0);-webkit-backdrop-filter:var(--glass-blur,blur(24px) saturate(190%));border-bottom:1px solid var(--nav-border,#e2e8f0cc);z-index:100;box-sizing:border-box;width:100%;padding:0 1.25rem;transition:all .3s;position:sticky;top:0;box-shadow:0 4px 20px #00000008}.nav-content{justify-content:space-between;align-items:center;gap:12px;width:100%;max-width:100%;height:64px;margin:0;display:flex}.brand{font-family:var(--font-display);letter-spacing:-.02em;cursor:pointer;transition:var(--transition-fast);align-items:center;gap:12px;font-size:1.25rem;font-weight:800;text-decoration:none;display:flex}.brand-text-wrapper{flex-direction:column;line-height:1.15;display:flex}.brand-title{-webkit-text-fill-color:transparent;background:linear-gradient(135deg,#1e40af,#7c3aed,#ec4899) 0 0/200%;-webkit-background-clip:text;background-clip:text;font-size:1.18rem;font-weight:800;animation:4s infinite gradient-shift;display:inline-block}.brand-subtitle-badge{color:#2563eb;background:#2563eb1a;border:1px solid #2563eb33;border-radius:6px;margin-top:2px;padding:1px 8px;font-size:.72rem;font-weight:700;display:inline-block}.nav-center-menu{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#f1f5f9bf;border:1px solid #cbd5e199;border-radius:30px;align-items:center;gap:6px;padding:4px 6px;display:flex;box-shadow:inset 0 1px 3px #0000000a}.nav-pill-btn{cursor:pointer;color:#475569;background:0 0;border:none;border-radius:20px;align-items:center;gap:6px;padding:7px 16px;font-size:.84rem;font-weight:700;transition:all .25s cubic-bezier(.4,0,.2,1);display:inline-flex;position:relative}.nav-pill-btn:hover{color:#1e293b;background:#fff9}.nav-pill-btn.active{color:#fff;background:linear-gradient(135deg,#2563eb,#7c3aed);box-shadow:0 4px 14px #2563eb4d}.nav-right-controls{align-items:center;gap:10px;display:flex}.role-badge-pill{text-transform:uppercase;letter-spacing:.06em;color:#2563eb;background:linear-gradient(135deg,#2563eb1a,#7c3aed1a);border:1px solid #2563eb40;border-radius:20px;align-items:center;gap:4px;padding:4px 12px;font-size:.72rem;font-weight:800;display:inline-flex}.nav-user-pill{background:var(--glass-bg,#ffffffe6);border:1px solid var(--glass-border,#cbd5e1cc);color:#1e293b;border-radius:30px;align-items:center;gap:8px;padding:4px 12px 4px 6px;font-size:.84rem;font-weight:700;transition:all .2s;display:inline-flex;box-shadow:0 2px 6px #0000000a}.nav-user-avatar{color:#fff;background:linear-gradient(135deg,#3b82f6,#8b5cf6);border-radius:50%;justify-content:center;align-items:center;width:28px;height:28px;font-size:.8rem;font-weight:800;display:flex}.nav-logout-icon-btn{color:#ef4444;cursor:pointer;background:#ef44441a;border:none;border-radius:50%;justify-content:center;align-items:center;width:26px;height:26px;margin-left:2px;transition:all .2s;display:flex}.nav-logout-icon-btn:hover{color:#fff;background:#ef4444;transform:scale(1.1)}@media(max-width:900px){.nav-center-menu{display:none}}.main-content{padding-top:2rem;padding-bottom:4rem}.lecture-header{border-bottom:1px solid var(--color-border);margin-bottom:3rem;padding-bottom:2rem;animation:.5s both fadeInUp}.lecture-header h1{background:linear-gradient(135deg,var(--color-primary),var(--violet));-webkit-text-fill-color:transparent;background-size:200%;-webkit-background-clip:text;background-clip:text;margin-bottom:1rem;font-size:2.2rem;animation:4s infinite gradient-shift}.hover-scale{transition:var(--transition-spring)}.hover-scale:hover{transform:scale(1.05)translateY(-2px)}.nav-logo{filter:var(--logo-filter,none);mix-blend-mode:var(--logo-blend,normal)}::-webkit-scrollbar{width:0;height:0;display:none}*{-ms-overflow-style:none;scrollbar-width:none}.nav-sidebar-toggle-btn{background:var(--color-primary-50,#2563eb14);color:var(--color-primary,#2563eb);border:1px solid var(--color-primary-100,#2563eb33);cursor:pointer;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;transition:all .2s;display:inline-flex}.nav-sidebar-toggle-btn:hover{background:var(--color-primary-100,#2563eb26);transform:scale(1.05)}.sidebar-backdrop{-webkit-backdrop-filter:blur(4px);z-index:998;background:#0f172a8c;animation:.2s fadeIn;position:fixed;inset:0}.app-sidebar{background:var(--nav-bg,#fffffff5);width:250px;-webkit-backdrop-filter:var(--glass-blur,blur(24px) saturate(180%));border-right:1px solid var(--nav-border,#e2e8f0cc);z-index:90;flex-direction:column;flex-shrink:0;gap:.75rem;padding:1.25rem 1rem;transition:width .3s cubic-bezier(.4,0,.2,1),transform .3s;display:flex;overflow-y:auto}@media(min-width:769px){.sidebar-backdrop,.sidebar-close-btn{display:none!important}.app-sidebar{height:auto!important;box-shadow:none!important;display:flex!important;position:static!important;transform:none!important}.app-sidebar.sidebar-closed{align-items:center!important;width:72px!important;padding:1.25rem .5rem!important}.app-sidebar.sidebar-closed .sidebar-header-bar,.app-sidebar.sidebar-closed .sidebar-section-controls,.app-sidebar.sidebar-closed .sidebar-divider,.app-sidebar.sidebar-closed .sidebar-nav-btn span{display:none!important}.app-sidebar.sidebar-closed .sidebar-nav-btn{border-radius:12px!important;justify-content:center!important;width:48px!important;height:48px!important;padding:0!important}.app-sidebar.sidebar-closed .sidebar-nav-items{align-items:center!important}}.sidebar-header-bar{border-bottom:1px solid var(--color-border,#e2e8f0);justify-content:space-between;align-items:center;padding-bottom:.75rem;display:flex}.sidebar-title{font-family:var(--font-display);color:var(--color-text-main);letter-spacing:-.01em;font-size:.95rem;font-weight:700}.sidebar-close-btn{color:var(--color-text-muted);cursor:pointer;background:0 0;border:none;border-radius:6px;justify-content:center;align-items:center;padding:4px;transition:color 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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 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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:10px;right:10px;display:flex;align-items:center;gap:4px;z-index:20;background:#0f172a66;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);padding:4px;border-radius:12px;border:1px solid rgba(255,255,255,.1)}.admin-icon-btn{width:30px;height:30px;border-radius:var(--radius-sm);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:var(--depth-1);transition:var(--transition-spring);font-size:.85rem;background:#ffffff1f;color:#fff;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.admin-icon-btn:hover{transform:scale(1.12);box-shadow:var(--depth-3)}.position-btn{width:auto;min-width:28px;padding:0 6px;font-weight:800;font-size:.76rem;background:linear-gradient(135deg,#2563eb,#7c3aed);color:#fff;border:1px solid rgba(255,255,255,.2)}.position-btn:hover{background:linear-gradient(135deg,#1d4ed8,#6d28d9)}.reorder-btn{color:#e2e8f0;background:#ffffff14;border:1px solid rgba(255,255,255,.15)}.reorder-btn:hover{background:#ffffff40;color:#fff}.edit-btn{color:var(--cyan-light);border:1px solid rgba(6,182,212,.2)}.edit-btn:hover{background:#06b6d433}.delete-btn{color:var(--rose-light);border:1px solid rgba(244,63,94,.2)}.delete-btn:hover{background:#f43f5e33}.selection-card.dragging{opacity:.45;border:2px dashed #3b82f6!important;transform:scale(.97)!important;cursor:grabbing!important}.selection-card.drag-over{border:2px solid #3b82f6!important;box-shadow:0 0 25px #3b82f680!important;transform:scale(1.04)!important}.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 both}.lecture-card:nth-child(5n+1){border-bottom:3px solid var(--cyan)}.lecture-card:nth-child(5n+2){border-bottom:3px solid var(--violet)}.lecture-card:nth-child(5n+3){border-bottom:3px solid var(--rose)}.lecture-card:nth-child(5n+4){border-bottom:3px solid var(--emerald)}.lecture-card:nth-child(5n+5){border-bottom:3px solid var(--amber)}.lecture-card:nth-child(1){animation-delay:.05s}.lecture-card:nth-child(2){animation-delay:.1s}.lecture-card:nth-child(3){animation-delay:.15s}.lecture-card:nth-child(4){animation-delay:.2s}.lecture-card:nth-child(5){animation-delay:.25s}.lecture-card:nth-child(5n+1):hover{box-shadow:var(--depth-4),var(--depth-glow-cyan)}.lecture-card:nth-child(5n+2):hover{box-shadow:var(--depth-4),var(--depth-glow-violet)}.lecture-card:nth-child(5n+3):hover{box-shadow:var(--depth-4),var(--depth-glow-rose)}.lecture-card:nth-child(5n+4):hover{box-shadow:var(--depth-4),var(--depth-glow-emerald)}.lecture-card:nth-child(5n+5):hover{box-shadow:var(--depth-4),var(--depth-glow-amber)}.lecture-card:hover{transform:perspective(800px) rotateX(-3deg) rotateY(3deg) translateY(-10px);border-color:#94a3b833}.card-image{height:150px;background-size:cover;background-position:center;background-color:var(--color-bg-light);position:relative;transition:transform .5s ease}.lecture-card:hover .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 #10b98159}.lecture-card:nth-child(5n+5) .card-number{background:linear-gradient(135deg,var(--amber),var(--rose));box-shadow:0 4px 12px #f59e0b59}.lecture-card:hover .card-number{transform:scale(1.1) translateY(-2px)}.card-content{position:relative;z-index:2;display:flex;flex-direction:column;justify-content:flex-end;flex:1}.card-content h3{font-family:var(--font-display);font-size:1.1rem;font-weight:700;margin:0 0 8px;line-height:1.35;color:var(--color-text-main);transition:color .3s}.lecture-card:nth-child(5n+1):hover .card-content h3{color:var(--cyan-light)}.lecture-card:nth-child(5n+2):hover .card-content h3{color:var(--violet-light)}.lecture-card:nth-child(5n+3):hover .card-content h3{color:var(--rose-light)}.lecture-card:nth-child(5n+4):hover .card-content h3{color:var(--emerald-light)}.lecture-card:nth-child(5n+5):hover .card-content h3{color:var(--amber-light)}.card-action{font-size:.8rem;font-weight:700;color:var(--cyan-light);text-transform:uppercase;letter-spacing:.06em;opacity:0;transform:translate(-10px);transition:all .4s cubic-bezier(.34,1.56,.64,1);display:inline-flex;align-items:center;gap:4px}.lecture-card:hover .card-action{opacity:1;transform:translate(0)}.resource-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}.resource-tag{display:inline-flex;align-items:center;gap:4px;padding:4px 12px;border-radius:var(--radius-full);font-size:.7rem;font-weight:600;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.resource-tag-quiz{background:#2563eb1f;color:var(--blue-light)}.resource-tag-ppt{background:#f59e0b1f;color:var(--amber-light)}.resource-tag-pdf{background:#f43f5e1f;color:var(--rose-light)}.objectives{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-lg);padding:1.25rem 1.5rem;margin:1.5rem auto 2rem;max-width:800px;box-shadow:var(--depth-2);position:relative;overflow:hidden;animation:fadeInUp .6s ease both;animation-delay:.2s}.objectives:before{content:"";position:absolute;top:0;left:0;width:4px;height:100%;background:linear-gradient(to bottom,var(--blue),var(--violet),var(--rose))}.objectives h3{color:var(--color-text-main);font-size:1rem;font-weight:700;margin-top:0;margin-bottom:.75rem;display:flex;align-items:center;gap:.5rem}.objectives h3:before{content:""}.objectives ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}.objectives li{display:flex;align-items:flex-start;font-size:.92rem;color:var(--color-text-secondary);line-height:1.5}.objectives li:before{content:"✓";color:var(--emerald);font-weight:700;margin-right:8px;flex-shrink:0}.lecture-header h1{text-align:center;font-size:2rem;font-weight:800;margin-bottom:.75rem;padding:0 1rem}.add-lecture-card{border:2px dashed var(--color-border)!important;background:#1e293b4d!important;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);opacity:.6;transition:var(--transition-spring)}.add-lecture-card:hover{opacity:1!important;border-color:var(--emerald)!important;background:#10b9810f!important;transform:perspective(800px) rotateX(-2deg) translateY(-8px)!important;box-shadow:var(--depth-glow-emerald)!important}@media(max-width:768px){.dashboard-header h1{font-size:1.5rem}.lecture-grid{grid-template-columns:1fr;gap:16px}.card-image{height:120px}}.lecture-page-container{max-width:1650px!important;width:96%!important;margin:0 auto;padding:1.25rem .5rem 4rem}.lecture-layout-wrapper{display:flex;gap:24px;width:100%;max-width:100%;margin:0 auto;align-items:flex-start;position:relative}.lecture-nav-sidebar{width:275px;min-width:260px;max-width:285px;background:var(--glass-bg, rgba(255, 255, 255, .85));backdrop-filter:var(--glass-blur, blur(16px));-webkit-backdrop-filter:var(--glass-blur, blur(16px));border:1px solid var(--glass-border, rgba(226, 232, 240, .8));border-radius:var(--radius-xl, 16px);padding:1.15rem 1rem;position:sticky;top:80px;max-height:calc(100vh - 100px);display:flex;flex-direction:column;box-shadow:0 10px 30px #0000000a;transition:all .3s cubic-bezier(.4,0,.2,1);z-index:10;flex-shrink:0}.lecture-nav-header{margin-bottom:.85rem;padding-bottom:.75rem;border-bottom:1px solid rgba(226,232,240,.8)}.lecture-nav-back-btn{background:#2563eb14;color:var(--color-primary, #2563eb);border:1px solid rgba(37,99,235,.2);border-radius:10px;padding:8px 14px;font-size:.84rem;font-weight:700;cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:all .2s ease;width:100%;justify-content:flex-start;margin-bottom:12px}.lecture-nav-back-btn:hover{background:var(--color-primary, #2563eb);color:#fff;transform:translate(-3px);box-shadow:0 4px 12px #2563eb40}.lecture-nav-course-badge{display:inline-flex;align-items:center;gap:6px;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:#64748b;margin-bottom:4px}.lecture-nav-subject-title{font-family:var(--font-display);font-size:1.15rem;font-weight:800;color:var(--color-text-main, #0f172a);margin:2px 0 6px;line-height:1.3}.lecture-nav-meta{display:flex;align-items:center;justify-content:space-between;font-size:.78rem;color:#64748b;font-weight:600}.lecture-nav-search{width:100%;padding:8px 12px;border-radius:10px;border:1px solid #cbd5e1;background:#fff9;font-size:.82rem;margin-top:10px;outline:none;transition:border-color .2s ease}.lecture-nav-search:focus{border-color:#2563eb;box-shadow:0 0 0 3px #2563eb26}.lecture-nav-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:8px;padding-right:4px;margin-top:6px}.lecture-nav-item{display:flex;align-items:flex-start;gap:12px;padding:10px 12px;border-radius:12px;background:#ffffff80;border:1px solid transparent;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);text-align:left;text-decoration:none;color:inherit}.lecture-nav-item:hover{background:#2563eb0f;border-color:#2563eb26;transform:translate(3px)}.lecture-nav-number{width:28px;height:28px;border-radius:8px;background:#94a3b826;color:#64748b;display:flex;align-items:center;justify-content:center;font-size:.78rem;font-weight:700;flex-shrink:0;transition:all .2s ease}.lecture-nav-info{flex:1;min-width:0}.lecture-nav-title{font-size:.88rem;font-weight:600;color:var(--color-text-secondary, #334155);line-height:1.4;white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.lecture-nav-item.active{background:linear-gradient(135deg,#2563eb1f,#7c3aed1f);border:1px solid rgba(37,99,235,.35);border-left:4px solid #2563eb;box-shadow:0 4px 16px #2563eb1f}.lecture-nav-item.active .lecture-nav-number{background:linear-gradient(135deg,#2563eb,#7c3aed);color:#fff;font-weight:800;box-shadow:0 2px 8px #2563eb4d}.lecture-nav-item.active .lecture-nav-title{color:#1d4ed8;font-weight:800}.lecture-nav-active-tag{display:inline-flex;align-items:center;gap:4px;font-size:.68rem;font-weight:800;text-transform:uppercase;color:#2563eb;background:#2563eb26;padding:2px 6px;border-radius:4px;margin-top:4px}.lecture-nav-active-tag:before{content:"";width:5px;height:5px;border-radius:50%;background:#2563eb;animation:pulse-glow 1.5s infinite}.lecture-main-reader{flex:1;min-width:0;width:100%}.lecture-top-action-bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;padding:10px 16px;background:var(--glass-bg, rgba(255, 255, 255, .7));-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--glass-border, rgba(226, 232, 240, .8));border-radius:14px;flex-wrap:wrap;gap:10px}.lecture-breadcrumb{display:flex;align-items:center;gap:8px;font-size:.85rem;color:#64748b;font-weight:600;flex-wrap:wrap}.lecture-breadcrumb-link{color:#2563eb;cursor:pointer;text-decoration:none;font-weight:700}.lecture-breadcrumb-link:hover{text-decoration:underline}.lecture-sidebar-toggle-btn{background:#ffffffe6;border:1px solid #cbd5e1;border-radius:8px;padding:6px 12px;font-size:.82rem;font-weight:700;color:#334155;cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:all .2s ease}.lecture-sidebar-toggle-btn:hover{background:#f1f5f9;border-color:#94a3b8}.lecture-pager-container{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:3rem;padding-top:2rem;border-top:1px solid rgba(226,232,240,.8)}.lecture-pager-btn{display:flex;flex-direction:column;padding:16px 20px;background:var(--glass-bg, rgba(255, 255, 255, .8));-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--glass-border, rgba(226, 232, 240, .8));border-radius:16px;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);text-align:left;box-shadow:0 4px 12px #00000008}.lecture-pager-btn.next{text-align:right;align-items:flex-end}.lecture-pager-btn:hover{background:linear-gradient(135deg,#2563eb0f,#7c3aed0f);border-color:#2563eb4d;transform:translateY(-3px);box-shadow:0 8px 24px #2563eb1f}.lecture-pager-direction{font-size:.76rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em;color:#2563eb;display:inline-flex;align-items:center;gap:4px;margin-bottom:4px}.lecture-pager-title{font-size:.95rem;font-weight:700;color:var(--color-text-main, #0f172a)}.lecture-mobile-drawer-overlay{position:fixed;inset:0;background:#0f172a99;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:9998}.lecture-mobile-drawer-content{position:fixed;top:0;left:0;bottom:0;width:85%;max-width:320px;background:#fff;z-index:9999;padding:1.25rem;display:flex;flex-direction:column;box-shadow:0 0 40px #0000004d;animation:slideInLeft .3s ease}@media(max-width:960px){.lecture-nav-sidebar{display:none}.lecture-pager-container{grid-template-columns:1fr}.lecture-pager-btn.next{text-align:left;align-items:flex-start}}.teacher-tools-panel{margin-top:1.25rem;padding-top:1rem;border-top:1px dashed var(--color-border)}.teacher-action-bar{display:flex;align-items:center;flex-wrap:wrap;gap:12px}.teacher-badge{font-size:.75rem;font-weight:700;text-transform:uppercase;color:var(--color-text-secondary);background:var(--color-surface-hover, rgba(0,0,0,.05));padding:4px 10px;border-radius:20px;display:flex;align-items:center;gap:6px;border:1px solid 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 infinite;transform-style:preserve-3d;margin:1rem}@keyframes float3D{0%,to{transform:translateY(0) rotateX(2deg) rotateY(-2deg)}50%{transform:translateY(-10px) rotateX(-2deg) rotateY(2deg)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.login-glow-orb{position:absolute;border-radius:50%;filter:blur(60px);z-index:-1;opacity:.6;animation:orbTranslate 8s infinite alternate ease-in-out;transform:translateZ(-50px)}.orb-1{width:220px;height:220px;background:var(--color-primary);top:-60px;left:-60px}.orb-2{width:180px;height:180px;background:var(--violet, #8b5cf6);bottom:-40px;right:-40px;animation-delay:-4s}@keyframes orbTranslate{0%{transform:translateZ(-50px) translate(0) translateY(0) scale(1)}to{transform:translateZ(-50px) translate(30px) translateY(30px) scale(1.2)}}.modal-content.login-modal{background:var(--color-surface, rgba(15, 23, 42, .85));backdrop-filter:blur(24px) saturate(180%);-webkit-backdrop-filter:blur(24px) saturate(180%);padding:3rem 2.5rem;border-radius:var(--radius-xl);width:100%;position:relative;box-shadow:0 25px 50px #00000080,inset 0 1px 1px #ffffff26;border:1px solid var(--color-border);border-top:1px solid rgba(255,255,255,.2);border-left:1px solid rgba(255,255,255,.1);transform:translateZ(20px);overflow:hidden;transform-style:preserve-3d}.modal-content.login-modal:before{content:"";position:absolute;inset:0;background-image:url(/images/card_bg_blue.png);background-size:cover;background-position:center;opacity:.15;pointer-events:none;z-index:0;mix-blend-mode:overlay}.modal-content.login-modal>*{position:relative;z-index:1}.login-modal .close-btn{position:absolute;top:14px;right:14px;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--color-text-muted);width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:var(--transition-spring);z-index:2;transform:translateZ(30px)}.login-modal .close-btn:hover{background:var(--color-primary-50);color:var(--color-primary);transform:translateZ(30px) rotate(90deg) scale(1.1)}.login-modal h2{font-family:var(--font-display);font-size:2.2rem;font-weight:800;margin-bottom:.5rem;background:linear-gradient(135deg,var(--color-primary),var(--violet, #8b5cf6));-webkit-background-clip:text;-webkit-text-fill-color:transparent;text-align:center;text-shadow:0 4px 15px rgba(var(--color-primary-rgb),.3);transform:translateZ(40px)}.subtitle{text-align:center;color:var(--color-text-secondary);margin-bottom:2rem;font-size:.95rem;transform:translateZ(30px);letter-spacing:.02em}.login-modal .form-group{margin-bottom:1.5rem;transform:translateZ(30px)}.login-modal .form-group label{display:block;margin-bottom:8px;color:var(--color-text-main);font-weight:600;font-size:.9rem}.login-modal .form-group input{width:100%;padding:14px 16px;border-radius:var(--radius-md);border:1.5px solid var(--color-border);background:var(--input-bg, rgba(30, 41, 59, .6));color:var(--color-text-main);font-size:1rem;font-family:var(--font-sans);transition:all .3s cubic-bezier(.25,.8,.25,1);box-shadow:inset 0 2px 4px #0000001a}.login-modal .form-group input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 4px var(--color-primary-50),inset 0 2px 4px #0000001a;background:var(--input-bg-focus, rgba(30, 41, 59, .9));transform:translateY(-2px)}.error-msg{color:#ef4444;font-size:.85rem;margin-bottom:1rem;text-align:center;padding:10px 12px;background:#ef44441a;border-radius:var(--radius-sm);border-left:3px solid #ef4444;transform:translateZ(30px);animation:shake .4s cubic-bezier(.36,.07,.19,.97) both}@keyframes shake{10%,90%{transform:translate3d(-1px,0,30px)}20%,80%{transform:translate3d(2px,0,30px)}30%,50%,70%{transform:translate3d(-4px,0,30px)}40%,60%{transform:translate3d(4px,0,30px)}}.full-width.login-btn{width:100%;padding:16px;font-size:1.1rem;font-weight:700;font-family:var(--font-sans);background:linear-gradient(135deg,var(--color-primary),var(--violet, #8b5cf6));color:#fff;border:none;border-radius:var(--radius-md);cursor:pointer;transition:var(--transition-spring);box-shadow:var(--shadow-primary);transform:translateZ(35px);position:relative;overflow:hidden;text-transform:uppercase;letter-spacing:1px}.full-width.login-btn:after{content:"";position:absolute;top:0;left:-100%;width:50%;height:100%;background:linear-gradient(to right,transparent,rgba(255,255,255,.4),transparent);transform:skew(-25deg);animation:shine 4s infinite}@keyframes shine{0%{left:-100%}20%,to{left:200%}}.full-width.login-btn:hover{transform:translateZ(40px) translateY(-3px) scale(1.02);box-shadow:0 15px 30px rgba(var(--color-primary-rgb),.5)}.full-width.login-btn:active{transform:translateZ(20px) translateY(1px)}.password-input-wrapper{position:relative;display:flex;align-items:center;width:100%}.password-toggle-btn{position:absolute;right:12px;background:none;border:none;color:var(--color-text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;padding:4px;transition:color .2s}.password-toggle-btn:hover{color:var(--color-primary)}.creator-modal-overlay{position:fixed;inset:0;background:#0f172acc;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);display:flex;justify-content:center;align-items:center;z-index:99999;padding:1rem}.creator-modal-container{width:96vw;max-width:1650px;height:92vh;background:#fff;border-radius:20px;box-shadow:0 25px 50px -12px #0006;display:flex;flex-direction:column;overflow:hidden;border:1px solid rgba(255,255,255,.2)}.creator-modal-header{height:64px;flex-shrink:0;padding:0 1.5rem;background:#0f172a;color:#fff;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #1e293b}.creator-modal-body{flex:1;display:grid;grid-template-columns:1fr 1fr;overflow:hidden;background:#f8fafc}.creator-left-pane{display:flex;flex-direction:column;border-right:1px solid #e2e8f0;background:#fff;overflow-y:auto;padding:1.25rem;height:100%}.creator-right-pane{display:flex;flex-direction:column;background:#f8fafc;overflow-y:auto;padding:1.25rem;height:100%}.notion-editor-container{display:flex;flex-direction:column;gap:1.25rem;padding:.5rem 0;background:transparent;color:#1f2937;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.notion-section-card{background:#f9fafb;border:1px solid #e5e7eb;border-radius:14px;padding:1rem 1.25rem;transition:border-color .2s ease,box-shadow .2s ease}.notion-section-card:hover{border-color:#cbd5e1}.notion-section-header{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem;padding-bottom:.75rem;border-bottom:1px dashed #e2e8f0}.notion-section-title-input{font-size:1.15rem;font-weight:700;color:#1e293b;border:1px solid transparent;background:transparent;padding:4px 8px;border-radius:6px;flex:1}.notion-section-title-input:hover,.notion-section-title-input:focus{border-color:#cbd5e1;background:#fff;outline:none}.notion-block-card{background:#fff;border:1px solid #e2e8f0;border-radius:10px;padding:.85rem 1rem;margin-bottom:.75rem;transition:all .2s ease;box-shadow:0 2px 4px #00000005}.notion-block-card:hover{border-color:#93c5fd;box-shadow:0 4px 12px #3b82f614}.notion-block-toolbar{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-bottom:.6rem;padding-bottom:.5rem;border-bottom:1px solid #f1f5f9;flex-wrap:wrap}.notion-block-controls{display:flex;align-items:center;gap:.35rem;flex-wrap:wrap}.notion-icon-btn{background:transparent;border:none;color:#64748b;padding:4px 6px;border-radius:4px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:all .15s ease}.notion-icon-btn:hover{background:#f1f5f9;color:#1e293b}.notion-icon-btn-danger:hover{background:#fef2f2;color:#ef4444}.notion-type-select{font-size:.8rem;font-weight:600;color:#3b82f6;background:#eff6ff;border:1px solid #bfdbfe;padding:4px 8px;border-radius:6px;outline:none;cursor:pointer}.notion-ai-btn{font-size:.75rem;font-weight:600;color:#7c3aed;background:#f5f3ff;border:1px solid #ddd6fe;padding:4px 8px;border-radius:6px;cursor:pointer;display:inline-flex;align-items:center;gap:4px;transition:all .2s ease;white-space:nowrap}.notion-ai-btn:hover{background:#ede9fe;border-color:#c4b5fd}.notion-add-bar{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;padding:.6rem .8rem;background:#f8fafc;border:1px dashed #cbd5e1;border-radius:10px;margin-top:.75rem}.notion-add-pill{font-size:.78rem;font-weight:600;color:#475569;background:#fff;border:1px solid #e2e8f0;padding:4px 10px;border-radius:20px;cursor:pointer;display:inline-flex;align-items:center;gap:4px;transition:all .15s ease}.notion-add-pill:hover{border-color:#3b82f6;color:#2563eb;background:#eff6ff;transform:translateY(-1px)}.notion-input{width:100%;padding:.5rem .75rem;border:1px solid #cbd5e1;border-radius:6px;font-size:.9rem;color:#1e293b;background:#fff;margin-bottom:.5rem}.notion-input:focus{outline:none;border-color:#3b82f6;box-shadow:0 0 0 2px #3b82f626}.notion-textarea{width:100%;min-height:80px;padding:.6rem .75rem;border:1px solid #cbd5e1;border-radius:6px;font-size:.9rem;font-family:inherit;color:#1e293b;background:#fff;resize:vertical}.notion-textarea:focus{outline:none;border-color:#3b82f6;box-shadow:0 0 0 2px #3b82f626}@media(max-width:1024px){.creator-modal-body{grid-template-columns:1fr}}.block{margin-bottom:.5rem;padding:.5rem 0;position:relative}.block p{font-size:1rem;line-height:1.65;color:var(--color-text-secondary);margin:0;letter-spacing:.01em;text-align:justify;text-justify:inter-word}.block-text h3{font-family:var(--font-display);font-size:1.25rem;color:var(--color-text-main);font-weight:800;margin-top:.5rem;margin-bottom:.3rem;letter-spacing:-.01em;position:relative;display:inline-block}.block-text h4{font-family:var(--font-display);font-size:1.1rem;color:var(--color-text-secondary);font-weight:700;margin-top:.8rem;margin-bottom:.3rem}.block-text{margin-bottom:.9rem}.block-label{text-transform:uppercase;font-size:.72rem;font-weight:700;letter-spacing:.06em;margin-bottom:.5rem;display:inline-block;padding:4px 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translateY(0)}}.theme-panel-header{display:flex;justify-content:space-between;align-items:center;padding:12px 14px 8px}.theme-panel-header h4{margin:0;font-size:.95rem;font-weight:700;color:var(--color-text-main);font-family:var(--font-display)}.theme-close{background:none;border:none;color:var(--color-text-muted);cursor:pointer;padding:4px;border-radius:50%;display:flex;align-items:center;transition:all .2s}.theme-close:hover{color:var(--rose, #f43f5e);background:#f43f5e14}.theme-options{display:flex;flex-direction:column;gap:4px;padding:4px 0}.theme-option{display:flex;align-items:center;gap:12px;padding:10px 14px;border:2px solid transparent;border-radius:14px;background:var(--theme-option-bg, rgba(241, 245, 249, .5));cursor:pointer;transition:all .25s cubic-bezier(.4,0,.2,1);font-family:var(--font-sans);text-align:left;width:100%}.theme-option:hover{background:var(--theme-option-hover-bg, rgba(37, 99, 235, .06));border-color:var(--theme-option-hover-border, rgba(37, 99, 235, .15));transform:translate(3px)}.theme-option.active{border-color:var(--blue, #2563eb);background:var(--theme-option-active-bg, rgba(37, 99, 235, .08));box-shadow:0 0 0 3px #2563eb1a}.theme-preview-colors{display:flex;gap:3px;flex-shrink:0}.color-dot{width:14px;height:14px;border-radius:50%;border:1.5px solid rgba(255,255,255,.6);box-shadow:0 1px 3px #00000026}.theme-option-info{display:flex;flex-direction:column;gap:2px;min-width:0;flex:1}.theme-option-name{font-size:.88rem;font-weight:700;color:var(--color-text-main)}.theme-option-desc{font-size:.72rem;color:var(--color-text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.theme-check{color:var(--blue, #2563eb);flex-shrink:0;display:flex;align-items:center}[data-theme=dark-galaxy] .theme-panel,[data-theme=ocean-blue] .theme-panel,[data-theme=forest-green] .theme-panel,[data-theme=sunset-warm] .theme-panel{background:#0f172aeb;border-color:#94a3b81f;box-shadow:0 20px 60px #0006}[data-theme=dark-galaxy] .theme-option,[data-theme=ocean-blue] .theme-option,[data-theme=forest-green] .theme-option,[data-theme=sunset-warm] .theme-option{background:#1e293b80}[data-theme=dark-galaxy] .theme-option:hover,[data-theme=ocean-blue] .theme-option:hover,[data-theme=forest-green] .theme-option:hover,[data-theme=sunset-warm] .theme-option:hover{background:#1e293bcc;border-color:#94a3b833}