@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap";:root{--primary: #005D68;--primary-dark: #00424A;--primary-light: #00818F;--primary-50: #E0F2F4;--primary-100: #B2DFE5;--primary-200: #80CBD4;--primary-300: #4DB6C2;--accent: #FFB800;--accent-dark: #E6A500;--success: #0F7B4E;--warning: #C27800;--danger: #D32F2F;--info: #005D68;--bg: #F5F7F8;--bg-card: #FFFFFF;--text: #111111;--text-secondary: #555555;--text-muted: #888888;--border: #E0E0E0;--border-light: #F0F0F0;--radius-sm: 8px;--radius: 12px;--radius-lg: 16px;--radius-xl: 24px;--shadow-sm: 0 1px 3px rgba(0,0,0,.06);--shadow: 0 4px 12px rgba(0,0,0,.06);--shadow-lg: 0 8px 24px rgba(0,0,0,.08);--transition: .2s cubic-bezier(.4, 0, .2, 1);--header-h: 64px;--max-w: 1200px}[data-theme=dark]{--bg: #0A0A0A;--bg-card: #1A1A1A;--text: #F5F5F5;--text-secondary: #AAAAAA;--text-muted: #777777;--border: #2A2A2A;--border-light: #222222;--shadow-sm: 0 1px 3px rgba(0,0,0,.3);--shadow: 0 4px 12px rgba(0,0,0,.3);--shadow-lg: 0 8px 24px rgba(0,0,0,.4);--primary-50: #0A2A2E;--primary-100: #0D353A}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;transition:background var(--transition),color var(--transition)}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;display:block}button{cursor:pointer;border:none;font-family:inherit}input,textarea,select{font-family:inherit;font-size:1rem}.container{width:100%;max-width:var(--max-w);margin:0 auto;padding:0 24px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.25;color:var(--text)}h1{font-size:clamp(2rem,4vw,3rem);letter-spacing:-.02em}h2{font-size:clamp(1.5rem,3vw,2.2rem);letter-spacing:-.01em}h3{font-size:1.2rem}.section-title{font-size:1.8rem;font-weight:800;color:var(--text);margin-bottom:6px}.section-subtitle{color:var(--text-secondary);font-size:1.05rem;margin-bottom:40px}.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;border-radius:var(--radius);font-weight:600;font-size:.95rem;transition:all var(--transition);white-space:nowrap}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 4px 12px #005d684d}.btn-accent{background:var(--accent);color:#111}.btn-accent:hover{background:var(--accent-dark);transform:translateY(-1px)}.btn-outline{border:2px solid var(--border);background:transparent;color:var(--text)}.btn-outline:hover{border-color:var(--primary);color:var(--primary)}.btn-white{border:2px solid rgba(255,255,255,.3);background:transparent;color:#fff}.btn-white:hover{background:#ffffff1a;border-color:#fff}.btn-sm{padding:8px 16px;font-size:.85rem}.card{background:var(--bg-card);border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow);transition:all var(--transition);border:1px solid var(--border-light)}.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}.site-header{position:sticky;top:0;z-index:100;background:#ffffffe6;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid var(--border-light);height:var(--header-h);display:flex;align-items:center}[data-theme=dark] .site-header{background:#0a0a0ae6}.header-inner{display:flex;align-items:center;justify-content:space-between;width:100%;max-width:var(--max-w);margin:0 auto;padding:0 24px}.logo-svg{height:32px;width:auto}.nav-links{display:flex;gap:2px;align-items:center;list-style:none}.nav-links a{padding:8px 14px;border-radius:8px;font-size:.88rem;font-weight:500;color:var(--text-secondary);transition:all var(--transition)}.nav-links a:hover,.nav-links a.active{color:var(--primary);background:var(--primary-50)}.nav-cta{background:var(--primary)!important;color:#fff!important;padding:8px 18px!important}.nav-cta:hover{background:var(--primary-dark)!important;color:#fff!important}.header-actions{display:flex;align-items:center;gap:8px}.theme-btn{width:38px;height:38px;border-radius:10px;background:var(--bg);border:1px solid var(--border);font-size:1rem;color:var(--text);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all var(--transition)}.theme-btn:hover{background:var(--primary);color:#fff;border-color:var(--primary)}.hamburger{display:none;width:38px;height:38px;border-radius:10px;background:transparent;border:1px solid var(--border);font-size:1.1rem;color:var(--text);align-items:center;justify-content:center;cursor:pointer}.mobile-nav{display:none;flex-direction:column;gap:2px;padding:12px 24px 16px;background:#fffffff5;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}[data-theme=dark] .mobile-nav{background:#0a0a0af5}.mobile-nav.open{display:flex}.mobile-nav a{padding:10px 14px;border-radius:8px;font-weight:500;color:var(--text-secondary)}.mobile-nav a:hover{background:var(--primary-50);color:var(--primary)}@media (max-width:900px){.nav-links{display:none}.hamburger{display:flex}.mobile-nav{display:none;position:absolute;top:var(--header-h);left:0;right:0}.mobile-nav.open{display:flex}}.hero{background:var(--primary);color:#fff;padding:80px 0 60px;text-align:center;position:relative;overflow:hidden}.hero:after{content:"";position:absolute;bottom:0;left:0;right:0;height:60px;background:linear-gradient(to bottom,transparent,var(--bg))}.hero h1{color:#fff;position:relative;z-index:1;margin-bottom:16px}.hero p{position:relative;z-index:1;color:#ffffffd9;font-size:1.1rem;max-width:550px;margin:0 auto 24px}.hero .btn-white{margin:0 6px}.section{padding:64px 0}.subject-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow);transition:all var(--transition);border:1px solid var(--border-light);border-top:3px solid var(--primary);cursor:pointer;display:block}.subject-card:hover{border-top-color:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.subject-card h3{font-size:1rem;font-weight:700;margin-bottom:4px;color:var(--text)}.subject-card p{color:var(--text-muted);font-size:.85rem;line-height:1.4}.subject-card .pill{display:inline-block;margin-top:10px;padding:3px 10px;border-radius:20px;font-size:.72rem;font-weight:600;background:var(--primary-50);color:var(--primary)}.main-footer{background:var(--text);color:#fff;padding:56px 0 24px}.main-footer .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px}.main-footer h4{color:#fff;margin-bottom:16px;font-size:.95rem;font-weight:700}.main-footer a{color:#fff9;font-size:.88rem;display:block;padding:4px 0;transition:color .2s}.main-footer a:hover{color:var(--accent)}.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:40px;padding-top:20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;font-size:.82rem;color:#fff6}.footer-brand{display:flex;align-items:center;gap:12px}.pill{display:inline-block;padding:4px 12px;border-radius:20px;font-size:.75rem;font-weight:600}.pill-teal{background:var(--primary-50);color:var(--primary)}.pill-amber{background:#fff8e1;color:var(--warning)}.pill-green{background:#e8f5e9;color:var(--success)}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}@media (max-width:768px){.main-footer .footer-grid{grid-template-columns:1fr 1fr}.card-grid{grid-template-columns:1fr}.hero{padding:48px 0 36px}.section{padding:40px 0}}@media (max-width:480px){.main-footer .footer-grid{grid-template-columns:1fr}.container{padding:0 16px}}.assistant-widget{position:fixed;bottom:24px;right:24px;z-index:9999;font-family:Inter,sans-serif}.assistant-toggle{width:56px;height:56px;border-radius:50%;background:var(--primary,#005D68);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 20px #005d6859;transition:all .3s;position:relative}.assistant-toggle:hover{transform:scale(1.06);box-shadow:0 6px 24px #005d6873}.assistant-toggle.active{background:#111}.assistant-toggle-icon{font-size:24px;transition:transform .3s;color:#fff}.assistant-toggle.active .assistant-toggle-icon{transform:rotate(180deg)}.assistant-pulse{position:absolute;top:-3px;right:-3px;bottom:-3px;left:-3px;border-radius:50%;border:2px solid var(--primary);animation:pulse-ring 2s ease-out infinite;opacity:.5}@keyframes pulse-ring{0%{transform:scale(.9);opacity:.6}to{transform:scale(1.3);opacity:0}}.assistant-panel{position:absolute;bottom:76px;right:0;width:380px;max-height:580px;background:var(--bg-card,#fff);border-radius:var(--radius-lg);box-shadow:0 12px 40px #00000026;display:flex;flex-direction:column;overflow:hidden;transform:translateY(16px) scale(.96);opacity:0;pointer-events:none;transition:all .3s;border:1px solid var(--border)}.assistant-panel.open{transform:translateY(0) scale(1);opacity:1;pointer-events:all}.assistant-header{padding:14px 18px;background:var(--primary,#005D68);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:10px}.assistant-header-left{display:flex;align-items:center;gap:10px}.assistant-header h4{font-size:.9rem;margin:0;color:#fff}.assistant-status{font-size:.68rem;opacity:.8}.assistant-close-btn{width:28px;height:28px;border-radius:50%;border:none;background:#ffffff26;color:#fff;font-size:.85rem;cursor:pointer;display:flex;align-items:center;justify-content:center}.assistant-close-btn:hover{background:#ffffff40}.assistant-subject-select{padding:4px 8px;border-radius:6px;border:none;font-size:.68rem;background:#ffffff1f;color:#fff;cursor:pointer;max-width:110px}.assistant-subject-select option{color:#111;background:#fff}.assistant-messages{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:10px;max-height:330px}.assistant-message{display:flex;animation:msgIn .25s ease}.assistant-message.user{justify-content:flex-end}@keyframes msgIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.assistant-bubble{max-width:85%;padding:10px 14px;border-radius:14px;font-size:.85rem;line-height:1.5}.assistant-message.bot .assistant-bubble{background:var(--bg,#f5f7f8);border-bottom-left-radius:4px}.assistant-message.user .assistant-bubble{background:var(--primary,#005D68);color:#fff;border-bottom-right-radius:4px}.assistant-bubble p{margin-bottom:4px}.assistant-bubble ul{margin:4px 0;padding-left:16px}.assistant-bubble li{margin:2px 0}.assistant-bubble code{background:#0000000f;padding:2px 6px;border-radius:3px;font-size:.8rem}.assistant-typing{display:flex;gap:4px;padding:0 14px 10px}.assistant-typing span{width:7px;height:7px;border-radius:50%;background:var(--text-muted);animation:typingBounce 1.4s ease-in-out infinite}.assistant-typing span:nth-child(2){animation-delay:.2s}.assistant-typing span:nth-child(3){animation-delay:.4s}@keyframes typingBounce{0%,80%,to{transform:scale(.6);opacity:.3}40%{transform:scale(1);opacity:1}}.assistant-input-area{padding:10px 14px;border-top:1px solid var(--border)}.assistant-quick-actions{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:8px}.assistant-quick-btn{padding:4px 10px;border-radius:12px;font-size:.7rem;background:var(--bg);border:1px solid var(--border);cursor:pointer;transition:all .2s;white-space:nowrap}.assistant-quick-btn:hover{background:var(--primary);color:#fff;border-color:var(--primary)}.assistant-input-row{display:flex;gap:6px;align-items:flex-end}.assistant-input{flex:1;padding:9px 12px;border:1.5px solid var(--border);border-radius:10px;resize:none;font-size:.85rem;outline:none;min-height:38px;background:var(--bg-card);color:var(--text)}.assistant-input:focus{border-color:var(--primary)}.assistant-send-btn{width:38px;height:38px;border-radius:50%;background:var(--primary);color:#fff;font-size:.9rem;border:none;cursor:pointer;flex-shrink:0;display:flex;align-items:center;justify-content:center}.assistant-send-btn:hover{background:var(--primary-dark)}.assistant-send-btn:disabled{opacity:.4;cursor:default}.assistant-disclaimer{font-size:.6rem;color:var(--text-muted);text-align:center;margin-top:6px}@media (max-width:480px){.assistant-panel{width:calc(100vw - 32px);right:-4px;max-height:65vh}.assistant-widget{bottom:16px;right:16px}.assistant-toggle{width:48px;height:48px}}.timer-widget{position:fixed;bottom:24px;left:24px;z-index:9998;font-family:Inter,sans-serif}.timer-toggle{width:48px;height:48px;border-radius:50%;background:var(--bg-card,#fff);border:1.5px solid var(--border);cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);transition:all var(--transition);font-size:1.1rem;color:var(--text)}.timer-toggle:hover{border-color:var(--primary);transform:scale(1.06)}.timer-toggle.active{background:var(--primary);color:#fff;border-color:var(--primary)}.timer-panel{position:absolute;bottom:64px;left:0;width:260px;background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:18px;border:1px solid var(--border);transform:translateY(10px) scale(.95);opacity:0;pointer-events:none;transition:all .3s;text-align:center}.timer-panel.open{transform:translateY(0) scale(1);opacity:1;pointer-events:all}.timer-display{font-size:2.8rem;font-weight:800;font-variant-numeric:tabular-nums;color:var(--text);margin:4px 0 12px;letter-spacing:1px}.timer-display.running{color:var(--primary)}.timer-display.warning{color:var(--warning);animation:timerPulse .5s ease-in-out infinite}@keyframes timerPulse{0%,to{opacity:1}50%{opacity:.4}}.timer-label{font-size:.8rem;font-weight:600;color:var(--text-muted);margin-bottom:4px}.timer-presets{display:flex;gap:5px;justify-content:center;margin-bottom:12px}.timer-preset{padding:5px 10px;border-radius:7px;font-size:.72rem;font-weight:600;background:var(--bg);border:1px solid var(--border);cursor:pointer;transition:all .2s}.timer-preset:hover{border-color:var(--primary)}.timer-preset.active{background:var(--primary);color:#fff;border-color:var(--primary)}.timer-progress{width:100%;height:4px;background:var(--bg);border-radius:2px;overflow:hidden;margin-bottom:12px}.timer-progress-fill{height:100%;border-radius:2px;background:var(--primary);transition:width 1s linear}.timer-controls{display:flex;gap:8px;justify-content:center}.timer-btn{width:36px;height:36px;border-radius:50%;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:.85rem;transition:all .2s}.timer-btn-play{background:var(--primary);color:#fff}.timer-btn-play:hover{transform:scale(1.08)}.timer-btn-reset{background:var(--bg);color:var(--text-muted);border:1px solid var(--border)}.timer-btn-reset:hover{background:var(--danger);color:#fff;border-color:var(--danger)}.timer-sessions{display:flex;gap:4px;justify-content:center;margin-top:10px}.timer-session-dot{width:7px;height:7px;border-radius:50%;background:var(--border)}.timer-session-dot.done{background:var(--primary)}.timer-session-dot.current{background:var(--accent);animation:dotPulse .8s ease-in-out infinite}@keyframes dotPulse{0%,to{transform:scale(1)}50%{transform:scale(1.5)}}@media (max-width:480px){.timer-widget{bottom:76px;left:14px}.timer-toggle{width:42px;height:42px;font-size:1rem}}