*{box-sizing:border-box}
:root{--bg:#080d18;--panel:#11182b;--panel2:#151e34;--line:#27324d;--text:#edf2ff;--muted:#94a3b8;--accent:#7c3aed;--accent2:#4f46e5;--brand-blue:#5267ff;--green:#22c55e;--red:#ef4444;--code:#080d18}
body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:radial-gradient(circle at 80% -10%,#312e8133,transparent 32%),#080d18;color:var(--text);min-height:100vh}
a{text-decoration:none;color:inherit}
button,input,textarea{font:inherit}
button{cursor:pointer}
.brand{display:flex;align-items:center;gap:11px}.brand div{display:flex;flex-direction:column}.brand b{letter-spacing:-.02em}.brand small,.toolbar small{color:var(--muted);margin-top:2px}.logo-mark{position:relative;display:block;width:42px;height:42px;flex:0 0 42px;border-radius:13px;background:linear-gradient(145deg,#ffffff,#e9edff);border:1px solid #dbe2f3;box-shadow:0 7px 18px #0003}.logo-mark::before{content:"";position:absolute;left:11px;top:8px;width:19px;height:24px;border:6px solid #6636d8;border-left-width:7px;border-radius:8px 13px 13px 8px;transform:skewY(29deg) rotate(-1deg)}.logo-mark::after{content:"";position:absolute;left:18px;top:14px;width:0;height:0;border-top:9px solid transparent;border-bottom:9px solid transparent;border-left:14px solid #6875ff;filter:drop-shadow(-5px 4px 0 #7b35d8)}.brand-hero .logo-mark{width:88px;height:88px;flex-basis:88px;border-radius:27px}.brand-hero .logo-mark::before{left:24px;top:17px;transform:scale(1.7) skewY(29deg)}.brand-hero .logo-mark::after{left:38px;top:30px;transform:scale(1.7)}
.eyebrow{font-size:11px;letter-spacing:.15em;color:#a5b4fc;font-weight:800}
.landing{background:radial-gradient(circle at 20% 20%,#5267ff40,transparent 35%),radial-gradient(circle at 85% 65%,#7c3aed2e,transparent 30%),#080d18}
.landing-wrap{min-height:100vh;display:grid;place-items:center;padding:35px}.hero{width:min(1050px,100%);padding:44px;border:1px solid var(--line);border-radius:28px;background:#0d1424dd;box-shadow:0 30px 80px #0006}.hero>.eyebrow{display:inline-block;margin-top:55px}.hero h1{font-size:clamp(42px,7vw,78px);line-height:.98;margin:14px 0 20px;letter-spacing:-.05em}.hero>p{max-width:720px;color:#b6c2d6;font-size:18px;line-height:1.65}
.role-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:36px}.role{border:1px solid var(--line);border-radius:22px;padding:25px;background:#11192c;transition:.2s}.role:hover{transform:translateY(-4px);border-color:#6d5ce7}.role h2{margin:12px 0 8px}.role p{color:var(--muted);min-height:48px}.role b{color:#c4b5fd}.big-icon{font-size:34px}
.topbar{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 20px;border-bottom:1px solid var(--line);background:#0d1424;position:sticky;top:0;z-index:5}.room-box{display:flex;align-items:center;gap:9px;background:#151e34;border:1px solid var(--line);padding:8px 13px;border-radius:12px}.room-box span{font-size:10px;color:var(--muted);letter-spacing:.12em}.room-box b{letter-spacing:.18em;color:#c4b5fd}.header-right{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:14px}
.badge{padding:6px 9px;border-radius:999px;font-size:12px;font-weight:700}.badge.online{color:#86efac;background:#14532d55;border:1px solid #166534}.badge.offline{color:#fca5a5;background:#7f1d1d55;border:1px solid #991b1b}
.btn{border:1px solid var(--line);border-radius:10px;padding:9px 13px;color:var(--text);background:#151e34}.btn.primary{background:linear-gradient(135deg,var(--accent),var(--accent2));border:0}.btn.secondary{background:#24304c}.btn.ghost{background:transparent}.full{width:100%;padding:12px}.icon-btn{border:0;background:transparent;color:#c4b5fd;font-size:18px}
.teacher-layout{display:grid;grid-template-columns:240px minmax(0,1fr);height:calc(100vh - 72px)}.sidebar{border-right:1px solid var(--line);background:#0c1322;padding:18px;overflow:auto}.side-title{display:flex;align-items:center;justify-content:space-between}.side-title h3{margin:4px 0}.count{background:#252f49;padding:4px 8px;border-radius:999px;font-size:12px}.students{margin-top:18px}.student-item{width:100%;display:flex;align-items:center;gap:10px;text-align:left;padding:11px;border-radius:12px;border:1px solid transparent;background:transparent;color:var(--text);margin-bottom:7px}.student-item:hover,.student-item.active{background:#18223a;border-color:#384561}.avatar{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:#312e81;font-weight:800}.student-meta{min-width:0}.student-meta b{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.student-meta small{color:#86efac}
.main,.student-main{min-width:0;padding:16px}.student-main{max-width:1500px;margin:auto}.view-tabs,.code-tabs{display:flex;gap:5px}.view-tabs{margin-bottom:12px}.view-tab,.code-tab{border:0;color:var(--muted);background:transparent;padding:10px 14px;border-radius:9px}.view-tab.active,.code-tab.active{color:white;background:#202a44}.view{display:none}.view.active{display:block}.toolbar{min-height:56px;display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--panel);border:1px solid var(--line);border-radius:14px 14px 0 0;padding:10px 14px}.toolbar>div:first-child{display:flex;flex-direction:column}.actions{display:flex!important;flex-direction:row!important;align-items:center;gap:9px}.check{font-size:13px;color:var(--muted)}
.code-workspace{display:grid;grid-template-columns:1fr 1fr;min-height:calc(100vh - 180px);border:1px solid var(--line);border-top:0;border-radius:0 0 14px 14px;overflow:hidden}.editor-card,.preview-card{min-width:0;background:var(--panel)}.editor-card{border-right:1px solid var(--line)}.code-tabs{height:45px;padding:5px 7px;background:#0f1729;border-bottom:1px solid var(--line)}.editor{display:none;width:100%;height:calc(100% - 45px);min-height:520px;resize:none;border:0;outline:0;padding:18px;background:var(--code);color:#dbeafe;font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;font-size:14px;line-height:1.6;tab-size:2}.editor.active{display:block}.student-editor,.watch-editor{color:#cbd5e1;background:#0b1120}
.panel-head{height:45px;display:flex;align-items:center;justify-content:space-between;padding:0 13px;border-bottom:1px solid var(--line);background:#0f1729;font-size:13px}.live{color:#86efac;font-size:11px}iframe{width:100%;height:calc(100% - 45px);min-height:520px;border:0;background:white}
.empty{color:var(--muted);text-align:center;padding:22px 8px}.empty.big{display:grid;place-items:center;min-height:60vh;font-size:28px}.empty.big h2{font-size:24px;margin:5px}.empty.big p{font-size:14px}.hidden{display:none!important}
.modal{position:fixed;inset:0;z-index:20;background:#050914e8;display:grid;place-items:center;padding:20px}.dialog{width:min(430px,100%);border:1px solid var(--line);border-radius:22px;background:#10182a;padding:28px;box-shadow:0 30px 80px #0009}.dialog h1{margin:28px 0 8px}.dialog>p{color:var(--muted);line-height:1.5}.dialog label{display:block;color:#cbd5e1;font-size:13px;margin:16px 0}.dialog input{width:100%;margin-top:7px;border:1px solid #34405d;background:#09101e;color:white;border-radius:10px;padding:12px;outline:none}.dialog input:focus{border-color:#8b5cf6}.room-input{text-transform:uppercase;letter-spacing:.25em;font-weight:800}.text-link{display:block;text-align:center;color:#a5b4fc;margin-top:16px;font-size:13px}.error{color:#fca5a5;font-size:13px;margin-top:10px}.toast{position:fixed;right:20px;bottom:20px;background:#172036;border:1px solid #394765;color:white;padding:11px 14px;border-radius:11px;opacity:0;pointer-events:none;transform:translateY(8px);transition:.2s;z-index:30}.toast.show{opacity:1;transform:none}
@media(max-width:900px){.role-grid,.code-workspace{grid-template-columns:1fr}.teacher-layout{grid-template-columns:1fr}.sidebar{display:none}.editor-card{border-right:0;border-bottom:1px solid var(--line)}.topbar .brand small,.header-right>span:not(.badge){display:none}.hero{padding:26px}.hero>.eyebrow{margin-top:35px}.toolbar{align-items:flex-start;flex-direction:column}.editor,iframe{min-height:420px}.code-workspace{min-height:auto}}
@media(max-width:640px){
  body{overflow-x:hidden}
  .topbar{height:auto;min-height:64px;padding:10px 12px;gap:10px;flex-wrap:wrap;position:relative}
  .topbar .brand .logo-mark{width:34px;height:34px;flex-basis:34px;border-radius:9px}
  .topbar .brand .logo-mark::before{left:9px;top:7px;transform:scale(.8) skewY(29deg)}
  .topbar .brand .logo-mark::after{left:15px;top:11px;transform:scale(.8)}
  .topbar .brand b{font-size:14px}
  .room-box{margin-left:auto;padding:6px 9px}
  .header-right{width:100%;overflow-x:auto;justify-content:flex-start;gap:7px;padding-bottom:2px;white-space:nowrap}
  .header-right .btn{padding:8px 10px;font-size:12px}
  .student-main,.main{padding:10px}
  .view-tabs{overflow-x:auto;margin-bottom:10px}
  .view-tab{white-space:nowrap;padding:9px 12px}
  .toolbar{padding:11px;border-radius:12px 12px 0 0}
  .toolbar b{font-size:14px}
  .toolbar small{font-size:11px;display:block;max-width:290px}
  .actions{width:100%;display:grid!important;grid-template-columns:1fr 1fr;gap:7px}
  .actions .check{grid-column:1/-1}
  .actions .btn{width:100%;padding:10px 8px;font-size:12px}
  .code-workspace{border-radius:0 0 12px 12px}
  .code-tabs{height:48px;overflow-x:auto;flex-wrap:nowrap;padding:6px}
  .code-tab{flex:0 0 auto;padding:9px 12px;font-size:13px}
  .editor{height:48vh;min-height:300px;max-height:560px;padding:14px 12px;font-size:13px;line-height:1.55}
  iframe{height:52vh;min-height:300px;max-height:620px}
  .panel-head{height:44px;padding:0 11px}
  .preview-card.console-mode .console{min-height:300px;height:52vh;font-size:13px;padding:14px}
  .console{height:120px}
  .modal{padding:12px}
  .dialog{padding:22px 18px}
}
@media(min-width:901px){.student-main .code-workspace{min-height:calc(100vh - 180px)}}
.search{width:100%;margin-top:14px;padding:10px 11px;border:1px solid var(--line);border-radius:10px;background:#09101e;color:white;outline:0}.search:focus{border-color:#8b5cf6}
.console{height:110px;overflow:auto;padding:9px 12px;background:#090d16;border-top:1px solid var(--line);font:12px/1.5 monospace;color:#cbd5e1}.console:empty{display:none}.console-line{padding:2px 0}.console-line.warn{color:#facc15}.console-line.error{color:#fca5a5}
.console-empty{color:#64748b}.preview-card:not(.console-mode) .console{display:none}.preview-card.console-mode iframe{display:none}.preview-card.console-mode .console{display:block;height:calc(100% - 45px);min-height:520px;border-top:0;font-size:15px;padding:18px}.preview-card.console-mode .panel-head b::after{content:" · JavaScript Console";color:#94a3b8;font-weight:400}
.logo-image{display:block;width:42px;height:42px;flex:0 0 42px;object-fit:cover;border-radius:13px;box-shadow:0 7px 18px #0004}.brand-hero .logo-image{width:96px;height:96px;flex-basis:96px;border-radius:28px;animation:logoFloat 5s ease-in-out infinite}.hero-top{display:flex;align-items:center;justify-content:space-between;gap:20px}.live-pill{display:inline-flex;align-items:center;gap:8px;border:1px solid #315b58;background:#103b3544;color:#86efac;padding:8px 12px;border-radius:999px;font-size:11px;font-weight:800;letter-spacing:.08em}.live-pill i{width:7px;height:7px;border-radius:50%;background:#4ade80;box-shadow:0 0 16px #4ade80;animation:pulse 1.8s infinite}.hero h1 em{font-style:normal;background:linear-gradient(100deg,#c4b5fd,#60a5fa);background-clip:text;color:transparent}.hero-actions{display:flex;gap:12px;margin-top:28px}.hero-btn{font-weight:800;padding:13px 17px;min-width:170px}.hero-btn span{margin-left:8px;color:#c4b5fd}.feature-strip{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px;color:#aebbd1;font-size:12px}.feature-strip span{padding:8px 11px;border:1px solid #2d3a58;border-radius:999px;background:#101a2caa}.ambient{position:fixed;pointer-events:none;border-radius:50%;filter:blur(2px);opacity:.7}.ambient-one{width:220px;height:220px;right:12%;top:8%;background:#6d28d933;animation:drift 8s ease-in-out infinite}.ambient-two{width:160px;height:160px;left:7%;bottom:12%;background:#2563eb2b;animation:drift 10s ease-in-out infinite reverse}@keyframes logoFloat{0%,100%{transform:translateY(0) rotate(-1deg)}50%{transform:translateY(-7px) rotate(2deg)}}@keyframes pulse{50%{opacity:.35;transform:scale(.7)}}@keyframes drift{50%{transform:translate(22px,-18px) scale(1.12)}}
@media(max-width:640px){.brand-hero .logo-image{width:72px;height:72px;flex-basis:72px;border-radius:21px}.hero-top{align-items:flex-start}.hero-top .live-pill{font-size:9px;padding:7px 8px}.hero-actions{display:grid;grid-template-columns:1fr}.hero-btn{width:100%}.feature-strip{gap:6px}.feature-strip span{font-size:10px}.topbar .logo-image{width:34px;height:34px;flex-basis:34px;border-radius:9px}}

.symbol-bar {
  display: flex;
  gap: 6px;
  padding: 8px 10px;
  background: #0b1120;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: none;
}
.symbol-bar::-webkit-scrollbar {
  display: none;
}
.sym-btn {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: #1e293b;
  color: var(--text);
  font-family: monospace;
  font-size: 15px;
  font-weight: bold;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s, border-color 0.15s;
}
.sym-btn:hover {
  background: #334155;
  border-color: #475569;
}
.sym-btn:active {
  background: #475569;
}