:root{--bg:#f0f9ff;--surface:#fff;--card:#e0f2fe;--fg:#0c4a6e;--muted:#0369a1;--border:#bae6fd;--accent:#0891b2;--accent-2:#06b6d4;--accent-hover:#0e7490;--ai-primary:#0ea5e9;--ai-secondary:#06b6d4;--ai-dark:#0c4a6e;--ai-light:#e0f2fe;--ai-glow:rgba(14,165,233,.3);--vyskus-bg:#0a2540;--vyskus-bg-light:#0c3554;--vyskus-orange:#ff6b35;--vyskus-orange-light:#ff8c5f;--vyskus-blue:#4a9fd8;--vyskus-blue-light:#6bb3e0;--vyskus-text:#fff;--vyskus-text-muted:#d0e5f2;--vyskus-border:#1a4d6d;--vyskus-glow-blue:rgba(74,159,216,.3);--vyskus-glow-orange:rgba(255,107,53,.3);--container-max:1200px;--topbar-h:64px}*{box-sizing:border-box}body,html{height:100%}body{margin:0;background:var(--bg);color:var(--fg);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,Apple Color Emoji,Segoe UI Emoji;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;display:flex;min-height:100vh;flex-direction:column;padding-top:calc(var(--topbar-h) + env(safe-area-inset-top))}.topbar{position:fixed;top:0;left:0;right:0;z-index:1000;backdrop-filter:saturate(180%) blur(8px);-webkit-backdrop-filter:saturate(180%) blur(8px);background:hsla(0,0%,100%,.95);border-bottom:1px solid var(--ai-primary);box-shadow:0 2px 8px var(--ai-glow);transform:translateZ(0)}.topbar__inner{width:100%;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:0 24px;min-height:var(--topbar-h)}.brand{display:inline-flex;align-items:center;gap:.6rem;font-weight:700;letter-spacing:.2px;text-decoration:none;color:inherit}.brand__dot{width:10px;height:10px;border-radius:999px;background:radial-gradient(circle at 30% 30%,#a78bfa,#7c3aed);box-shadow:0 0 14px rgba(124,58,237,.4)}.nav a{color:var(--muted);font-size:.95rem;text-decoration:none}.nav a:hover{color:var(--fg)}.nav{display:flex;gap:1rem;align-items:center}@media (max-width:768px){.nav{flex-wrap:wrap;gap:8px}.topbar__inner{padding:0 12px;gap:8px}}.container{width:100%;max-width:var(--container-max);margin:0 auto;padding:1.5rem;background:#fff;flex-direction:column;min-height:0;overflow:visible}.container,.section{display:flex;flex:1 1 auto}.section{flex-direction:column}.hero{min-height:calc(100vh - 120px);display:grid;place-items:center;text-align:center}.hero h1{font-size:clamp(2rem,5vw,3rem);margin:0 0 1rem}.hero p{color:var(--muted);margin:0 0 1.5rem;font-size:1.1rem}.hero__image{max-width:min(720px,90vw);width:100%;height:auto;border-radius:12px;border:1px solid var(--border);margin:0 auto 1.25rem;display:block}.btns{display:flex;gap:.75rem;justify-content:center;flex-wrap:wrap}.btn{border:1px solid var(--border);background:#fff;color:var(--fg);padding:.6rem 1rem;border-radius:10px;text-decoration:none;display:inline-flex;align-items:center;gap:.5rem;transition:all .2s ease;cursor:pointer;font-size:.95rem}.btn:hover{box-shadow:0 2px 8px var(--ai-glow);transform:translateY(-1px)}.btn--primary,.btn:hover{border-color:var(--ai-primary)}.btn--primary{background:linear-gradient(135deg,var(--ai-primary),var(--ai-secondary));color:#fff}.btn--primary:hover{background:linear-gradient(135deg,var(--accent-hover),var(--ai-primary));box-shadow:0 4px 12px var(--ai-glow)}.btn--secondary{border-color:var(--ai-secondary);background:var(--ai-light);color:var(--ai-dark)}.grid-classroom{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,1fr);grid-template-rows:minmax(360px,1fr) auto auto;grid-gap:1rem;gap:1rem;flex:1 1 auto;min-height:0;grid-auto-rows:auto;position:relative;isolation:isolate}@media (max-width:960px){.grid-classroom{grid-template-columns:1fr;grid-template-rows:auto;grid-auto-rows:auto}}.stage-panel{grid-row:span 3;display:flex;flex-direction:column;min-height:0;overflow:hidden}.stage,.stage-panel{position:relative;z-index:0;min-width:0}.panel{background:linear-gradient(135deg,#e0f2fe,#f0f9ff);border:1px solid var(--ai-primary);border-radius:14px;padding:1rem;box-shadow:0 2px 6px var(--ai-glow)}.panel h3{margin:0 0 .5rem;font-size:1rem;color:var(--muted)}.stage{background:linear-gradient(135deg,#082f49,#0c4a6e);border:2px solid var(--ai-primary);border-radius:14px;display:flex;flex-direction:column;align-items:stretch;justify-content:stretch;padding:.5rem;overflow:hidden;box-shadow:0 4px 12px rgba(8,47,73,.4),inset 0 2px 8px var(--ai-glow)}.stage,.stage .chat__log{color:#fff;min-height:0;flex:1 1 auto}.stage .chat__log{height:auto;background:#000;border:1px solid #1f2937;overflow:auto;word-break:break-word;overflow-wrap:anywhere;white-space:pre-wrap;max-width:100%}.chat{display:flex;flex-direction:column;gap:.5rem}.chat__log{height:220px;overflow:auto;background:#f8fafc;border:1px solid var(--border);border-radius:10px;padding:.5rem}.chat__input{display:flex;gap:.5rem}.chat__input input{flex:1 1;padding:.6rem .75rem}.chat__input button,.chat__input input{border-radius:10px;border:1px solid var(--border);background:#fff;color:var(--fg)}.chat__input button{padding:.6rem .9rem}.roster ul{margin:0;padding-left:1.1rem}.footer{color:var(--muted);border-top:1px solid var(--border);padding:0;text-align:left;margin-top:2rem;position:relative;z-index:0;background:#fff;margin-bottom:env(safe-area-inset-bottom)}.grid-featured{display:grid;grid-gap:20px;gap:20px;grid-template-columns:1fr;width:100%;align-items:stretch;justify-items:stretch}@media (min-width:640px){.grid-featured{grid-template-columns:repeat(2,minmax(300px,1fr))}}@media (min-width:1024px){.grid-featured{grid-template-columns:repeat(3,minmax(320px,1fr))}}.page-vcenter{flex:1 1 auto;min-height:0;display:flex;flex-direction:column;margin-top:0;margin-bottom:0;width:100%;min-width:0}@media (max-width:900px){.header-about-link{display:none!important}}@media (max-width:768px){.header-greeting{display:none!important}}.vyskus-theme{background:var(--vyskus-bg);color:var(--vyskus-text);position:relative;overflow:hidden}.vyskus-theme:before{top:0;left:0;right:0;bottom:0;background-image:linear-gradient(90deg,var(--vyskus-blue) 1px,transparent 1px),linear-gradient(90deg,var(--vyskus-border) 1px,transparent 1px),linear-gradient(0deg,var(--vyskus-blue) 1px,transparent 1px),linear-gradient(0deg,var(--vyskus-border) 1px,transparent 1px),linear-gradient(135deg,transparent 48%,var(--vyskus-orange) 48%,var(--vyskus-orange) 52%,transparent 52%),linear-gradient(45deg,transparent 48%,var(--vyskus-blue) 48%,var(--vyskus-blue) 52%,transparent 52%);background-size:200px 200px,50px 50px,200px 200px,50px 50px,400px 400px,600px 600px;background-position:0 0,0 0,0 0,0 0,100px 100px,200px 200px;opacity:.15}.vyskus-theme:after,.vyskus-theme:before{content:"";position:absolute;pointer-events:none;z-index:0}.vyskus-theme:after{width:100%;height:100%;background-image:radial-gradient(circle at 20% 30%,var(--vyskus-orange) 2px,transparent 2px),radial-gradient(circle at 80% 20%,var(--vyskus-blue) 3px,transparent 3px),radial-gradient(circle at 60% 70%,var(--vyskus-blue) 2px,transparent 2px),radial-gradient(circle at 30% 80%,var(--vyskus-orange) 2px,transparent 2px),radial-gradient(circle at 90% 60%,var(--vyskus-blue) 2px,transparent 2px);background-size:100% 100%;background-repeat:no-repeat;opacity:.4}.vyskus-theme>*{position:relative;z-index:1}.vyskus-theme .panel{background:linear-gradient(135deg,var(--vyskus-bg-light) 0,rgba(12,53,84,.95) 100%);border:1px solid var(--vyskus-border);box-shadow:0 4px 12px rgba(0,0,0,.4),inset 0 1px 2px var(--vyskus-glow-blue)}.vyskus-theme .panel h3{color:var(--vyskus-orange);font-weight:600;text-shadow:0 0 8px var(--vyskus-glow-orange)}.vyskus-theme .stage{background:linear-gradient(135deg,#051f33 0,var(--vyskus-bg) 100%);border:2px solid var(--vyskus-blue);box-shadow:0 4px 16px rgba(0,0,0,.6),inset 0 2px 8px var(--vyskus-glow-blue),0 0 20px var(--vyskus-glow-blue)}.vyskus-theme .stage .chat__log{background:rgba(5,15,25,.9);border:1px solid var(--vyskus-border);color:var(--vyskus-text)}.vyskus-theme .chat__input input{background:var(--vyskus-bg-light);border:1px solid var(--vyskus-border);color:var(--vyskus-text)}.vyskus-theme .chat__input input::placeholder{color:var(--vyskus-text-muted)}.vyskus-theme .chat__input input:focus{outline:none;border-color:var(--vyskus-blue);box-shadow:0 0 0 2px var(--vyskus-glow-blue)}.vyskus-theme .essential-phrases-panel,.vyskus-theme .essential-phrases-panel *{color:#111827!important}.vyskus-theme .essential-phrases-panel h3{color:#000!important;text-shadow:none!important}.vyskus-theme .btn{background:var(--vyskus-bg-light);border:1px solid var(--vyskus-blue);color:var(--vyskus-text)}.vyskus-theme .btn:hover{border-color:var(--vyskus-orange);box-shadow:0 2px 12px var(--vyskus-glow-orange);background:var(--vyskus-bg)}.vyskus-theme .btn--primary{background:linear-gradient(135deg,var(--vyskus-orange) 0,#d95828 100%);border-color:var(--vyskus-orange);color:#fff;font-weight:600}.vyskus-theme .btn--primary:hover{background:linear-gradient(135deg,var(--vyskus-orange-light) 0,var(--vyskus-orange) 100%);box-shadow:0 4px 16px var(--vyskus-glow-orange)}.vyskus-theme .btn--secondary{background:transparent;border:1px solid var(--vyskus-blue);color:var(--vyskus-blue)}.vyskus-theme .btn--secondary:hover{background:var(--vyskus-bg-light);border-color:var(--vyskus-blue-light);color:var(--vyskus-blue-light)}.vyskus-theme .card,.vyskus-theme .course-card{background:linear-gradient(135deg,var(--vyskus-bg-light) 0,rgba(10,37,64,.95) 100%);border:1px solid var(--vyskus-border);box-shadow:0 2px 8px rgba(0,0,0,.3)}.vyskus-theme .card:hover,.vyskus-theme .course-card:hover{border-color:var(--vyskus-orange);box-shadow:0 4px 16px var(--vyskus-glow-orange);transform:translateY(-2px)}.vyskus-theme h1,.vyskus-theme h2,.vyskus-theme h3,.vyskus-theme h4{color:var(--vyskus-text)}.vyskus-theme p,.vyskus-theme span{color:var(--vyskus-text-muted)}.vyskus-theme .accent-text{color:var(--vyskus-orange);font-weight:600}.vyskus-theme .progress-bar{background:var(--vyskus-bg-light);border:1px solid var(--vyskus-border)}.vyskus-theme .progress-bar-fill{background:linear-gradient(90deg,var(--vyskus-orange) 0,var(--vyskus-orange-light) 100%);box-shadow:0 0 8px var(--vyskus-glow-orange)}.vyskus-theme .dialog,.vyskus-theme .modal{background:var(--vyskus-bg);border:2px solid var(--vyskus-blue);box-shadow:0 8px 32px rgba(0,0,0,.6),0 0 20px var(--vyskus-glow-blue)}.tour-button:hover{background:linear-gradient(135deg,#2563eb,#1e40af)!important;box-shadow:0 4px 8px rgba(59,130,246,.3)!important;transform:translateY(-1px)!important}.tour-button:active{transform:translateY(0)!important;box-shadow:0 2px 4px rgba(59,130,246,.2)!important}[data-tour=take-tour-button]:hover{border-color:#cbd5e1!important}[data-tour=take-tour-button]:active{border-color:#9ca3af!important}