:root{
  --blue:#229ed9;--blue2:#167fb4;--ink:#142033;--muted:#68798b;
  --line:#d8e1e9;--paper:#fff;--bg:#efeae3;--soft:#f4f7fa;
  --danger:#b42318;--ok:#14804a;--gold:#b98627;--violet:#7457c8;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;font-family:Inter,system-ui,-apple-system,Segoe UI,Arial,sans-serif;color:var(--ink);background:var(--bg)}
button,input,textarea,select{font:inherit}
a{text-decoration:none;color:inherit}
.hidden{display:none!important}
.site-head{max-width:1240px;margin:auto;padding:26px 22px 16px;display:flex;justify-content:space-between;gap:18px;align-items:center}
.brand small{display:block;text-transform:uppercase;letter-spacing:.09em;font-weight:800;color:var(--blue2)}
.brand h1{margin:3px 0;font-size:clamp(27px,4vw,44px)}
.brand p{margin:0;color:var(--muted)}
.top-actions{display:flex;gap:9px;flex-wrap:wrap}
.btn,.ghost,.primary,.secondary{border-radius:12px;padding:11px 15px;font-weight:800;cursor:pointer;border:0;display:inline-flex;align-items:center;justify-content:center;gap:7px}
.primary{background:var(--blue2);color:#fff}
.secondary,.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.danger{background:#fff0f0;color:var(--danger);border:1px solid #efb7b7}
.home{max-width:1180px;margin:auto;padding:18px 22px 50px}
.hero-card{background:linear-gradient(135deg,#11304a,#1b7ba7);color:#fff;border-radius:28px;padding:30px;box-shadow:0 20px 50px rgba(17,48,74,.2);margin-bottom:22px}
.hero-card h2{font-size:clamp(27px,4vw,46px);margin:0 0 8px}.hero-card p{max-width:760px;opacity:.9;line-height:1.55;margin:0}
.template-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px}
.template-card{background:#fff;border-radius:20px;padding:18px;border:1px solid rgba(216,225,233,.9);box-shadow:0 11px 30px rgba(20,32,51,.08);transition:.18s;min-height:210px;display:flex;flex-direction:column}
.template-card:hover{transform:translateY(-3px);box-shadow:0 16px 36px rgba(20,32,51,.12)}
.template-icon{width:56px;height:56px;border-radius:17px;display:grid;place-items:center;font-size:28px;background:#eaf6fc;margin-bottom:12px}
.template-card h3{margin:0 0 7px}.template-card p{color:var(--muted);line-height:1.45;margin:0 0 15px;flex:1}.template-card .primary{width:100%}
.builder{max-width:1240px;margin:auto;padding:12px 22px 45px;display:grid;grid-template-columns:440px minmax(0,1fr);gap:26px;align-items:start}
.preview-shell{position:sticky;top:14px}
.preview-card{width:440px;max-width:100%;height:760px;border-radius:32px;overflow:hidden;background:#111;box-shadow:0 22px 58px rgba(0,0,0,.2)}
.editor{display:grid;gap:15px}
.panel,.publish-panel{background:#fff;border-radius:21px;padding:20px;box-shadow:0 13px 36px rgba(20,32,51,.09)}
.panel h2{margin:0 0 8px}.panel h3{margin:18px 0 5px}.hint{font-size:13px;color:var(--muted);line-height:1.45}
.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
label{display:block;font-weight:780;margin-top:13px}
input,textarea,select{width:100%;margin-top:6px;border:1px solid var(--line);border-radius:12px;padding:11px 12px;background:#fff;color:var(--ink)}
textarea{min-height:85px;resize:vertical}
.actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:12px}
.status{margin-top:12px;padding:12px 13px;border-radius:12px;background:#eef7fd;color:#31546d;line-height:1.45}
.status.error{background:#fff0f0;color:#8e1b1b;border:1px solid #efb7b7}
.result{margin-top:13px}
.version{display:inline-block;background:#0c8955;color:#fff;border-radius:999px;padding:4px 9px;font-size:12px;vertical-align:middle}
.ai-panel{border:1px solid #cfe7f4;background:linear-gradient(180deg,#fff,#f7fcff)}
.prompt-box{min-height:170px;font-size:13px}
.student-page{min-height:100vh;display:grid;place-items:center;padding:18px}
.student-stage{width:min(1100px,100%);text-align:center}
.student-hint{color:var(--muted);max-width:760px;margin:12px auto}
.response-bar{max-width:800px;margin:14px auto 0;background:#fff;padding:10px;border-radius:17px;display:flex;gap:8px;align-items:center;box-shadow:0 10px 30px rgba(20,32,51,.12)}
.response-bar input{margin:0}.response-bar .name{max-width:180px}.response-bar .answer{flex:1}.round{width:44px;height:44px;border:0;border-radius:50%;background:var(--blue);color:#fff;cursor:pointer;flex:none}
.toast{position:fixed;left:50%;bottom:20px;transform:translateX(-50%);background:#132238;color:#fff;padding:11px 15px;border-radius:11px;z-index:99;max-width:92%}
.library{max-width:1050px;margin:auto;padding:20px}
.cards{display:grid;gap:12px}
.exercise-card{background:#fff;border-radius:17px;padding:17px;display:flex;justify-content:space-between;gap:15px;align-items:center;box-shadow:0 9px 25px rgba(20,32,51,.07)}
.exercise-card h2{margin:0;font-size:20px}.exercise-card p{margin:4px 0 0;color:var(--muted)}
.responses{max-width:1000px;margin:auto;padding:20px}.response-card{background:#fff;border-radius:16px;padding:16px;margin-bottom:10px}.response-card small{color:var(--muted)}audio{width:100%;margin-top:9px}
@media(max-width:1050px){.template-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:900px){.builder{grid-template-columns:1fr}.preview-shell{position:static;justify-self:center}.preview-card{width:min(440px,100%)}}
@media(max-width:680px){.template-grid{grid-template-columns:1fr 1fr}.two{grid-template-columns:1fr}.site-head{align-items:flex-start;flex-direction:column}.response-bar{flex-wrap:wrap}.response-bar .name{max-width:none}}
@media(max-width:440px){.template-grid{grid-template-columns:1fr}.home,.builder,.site-head{padding-left:10px;padding-right:10px}.preview-card{height:720px}}