:root{--cam:#E46125;--cam-dk:#c24e17;--vang:#F9A11B;--xam:#5C5C5C;--ink:#1f1f1f;--muted:#6b6b6b;--line:#ece7e2;--bg:#faf7f4;--card:#fff;--ok:#1f9d55}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:'Be Vietnam Pro',system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px}
a{color:var(--cam-dk)}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
.top{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.top-in{display:flex;align-items:center;justify-content:space-between;min-height:58px;gap:12px}
.brand{text-decoration:none;display:flex;align-items:baseline;gap:4px;font-weight:800;letter-spacing:.5px}
.brand .b1{color:var(--cam);font-size:20px}.brand .b2{color:var(--xam);font-size:20px}
.brand .b3{color:var(--muted);font-weight:500;font-size:13px;margin-left:8px;letter-spacing:0}
nav{display:flex;gap:16px;font-size:14px}nav a{text-decoration:none;color:var(--xam);font-weight:600}
main{padding:28px 16px 48px}
.eyebrow{color:var(--cam);font-weight:700;font-size:12px;text-transform:uppercase;letter-spacing:1.2px;margin:0 0 6px}
h1{font-size:28px;line-height:1.25;margin:0 0 8px}
h2{font-size:19px;margin:28px 0 10px}
.muted{color:var(--muted)}.small{font-size:13px;color:var(--muted);display:block}
.btn{display:inline-block;background:var(--cam);color:#fff;border:0;border-radius:10px;padding:12px 18px;font:inherit;font-weight:700;cursor:pointer;text-decoration:none;text-align:center}
.btn:hover{background:var(--cam-dk)}
.btn.ghost{background:#fff;color:var(--cam-dk);border:1.5px solid var(--cam)}
.btn.done{background:var(--ok)}
.alert{background:#fff4ec;border:1px solid #f6c3a5;color:#8a3510;padding:12px 14px;border-radius:10px;margin:12px 0}
.login{display:flex;justify-content:center;padding:24px 0}
.login-card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:28px;max-width:440px;width:100%;box-shadow:0 10px 30px rgba(0,0,0,.05)}
label{display:block;font-weight:600;font-size:14px;margin:14px 0 0}
input:not([type=checkbox]){display:block;width:100%;margin-top:6px;padding:12px;border:1.5px solid var(--line);border-radius:10px;font:inherit;background:#fff}
input:focus{outline:none;border-color:var(--vang)}
form .btn{margin-top:18px;width:100%}
.help{margin-top:22px;padding-top:16px;border-top:1px dashed var(--line);font-size:14px;color:var(--muted)}
.help-btns{display:flex;gap:10px;margin-top:10px;flex-wrap:wrap}.help-btns .btn{flex:1;padding:10px;font-size:14px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;margin-top:18px}
.course{display:block;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;text-decoration:none;color:inherit;border-top:4px solid var(--cam)}
.course:hover{box-shadow:0 10px 30px rgba(0,0,0,.07)}
.course h2{margin:0 0 6px}
.bar{height:8px;background:#f1ebe5;border-radius:9px;overflow:hidden;margin:12px 0 6px}.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--vang),var(--cam))}
.course-layout{display:grid;grid-template-columns:300px 1fr;gap:24px;align-items:start}
.side{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;position:sticky;top:76px;max-height:calc(100vh - 92px);overflow:auto}
.side-title{font-weight:800;text-decoration:none;color:var(--ink);display:block}
details{border-top:1px solid var(--line);padding:8px 0}
summary{cursor:pointer;font-weight:700;font-size:14px;color:var(--xam)}
details ol{list-style:none;padding:0;margin:6px 0 0}
details li a{display:flex;gap:8px;padding:6px 8px;border-radius:8px;text-decoration:none;color:var(--ink);font-size:14px}
details li a span{flex:0 0 26px;height:22px;border-radius:6px;background:#f1ebe5;color:var(--xam);font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center}
details li.ok a span{background:var(--ok);color:#fff}
details li.cur a{background:#fff4ec}details li.cur a span{background:var(--cam);color:#fff}
.lesson{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:28px;min-width:0}
.lens{display:inline-block;background:#fff4ec;color:var(--cam-dk);font-weight:700;font-size:13px;padding:4px 10px;border-radius:20px;margin:0 0 6px}
.why{background:#faf7f4;border-left:4px solid var(--vang);padding:14px 16px;border-radius:0 10px 10px 0;margin-top:14px}
.steps{padding-left:22px}.steps li{margin:8px 0}
.tip,.pass{padding:12px 14px;border-radius:10px;margin:10px 0}
.tip{background:#fffaf0;border:1px solid #fde3b0}.pass{background:#f0faf4;border:1px solid #bfe6cf}
.media{display:grid;gap:18px}
.media-item{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff}
.video{position:relative;padding-top:56.25%;background:#000}.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.media-text{padding:12px 16px}.media-text a{font-weight:700;text-decoration:none}
.watch{margin:6px 0 0;font-size:14px}
.reads{padding-left:20px}.reads li{margin:6px 0}
.reflect{background:#faf7f4;border-radius:12px;padding:6px 18px}
.nav-days{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:28px;flex-wrap:wrap}
.nav-days form .btn{margin:0;width:auto}
.hello{margin-bottom:8px}
.panel{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;margin-top:18px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}.form-grid .btn,.form-grid fieldset{grid-column:1/-1}
fieldset{border:1px solid var(--line);border-radius:10px;margin-top:14px}
.chk{display:inline-flex;align-items:center;gap:6px;font-weight:500;margin:6px 12px 0 0}
.code-box{background:#fff;border:2px solid var(--cam);border-radius:14px;padding:16px;margin:14px 0}
.code{font-size:28px;font-weight:800;letter-spacing:2px;color:var(--cam-dk);margin:6px 0;font-family:ui-monospace,monospace}
.table .row{display:grid;grid-template-columns:1.3fr 1.5fr auto;gap:12px;padding:14px 0;border-top:1px solid var(--line);align-items:start}
.row .btn{margin:0 0 6px;width:100%;padding:8px 12px;font-size:14px}
.edit input{margin-top:4px}
.foot{border-top:1px solid var(--line);padding:18px 0;color:var(--muted);font-size:13px;background:#fff}
@media (max-width:860px){
 .course-layout{grid-template-columns:1fr}.side{position:static;max-height:none;order:2}.lesson{order:1}
 .lesson{padding:18px}h1{font-size:23px}
 .form-grid{grid-template-columns:1fr}.table .row{grid-template-columns:1fr}
 .brand .b3{display:none}
}
.mission{background:linear-gradient(135deg,#fff4ec,#fffaf0);border:2px solid var(--cam);border-radius:14px;padding:18px 20px;margin:14px 0}
.mission .nv{font-size:20px;font-weight:700;line-height:1.45;margin:4px 0 8px}
.deep{border:1px solid var(--line);border-radius:12px;padding:10px 16px;margin-top:22px}
.deep summary{color:var(--cam-dk)}