:root{
  /* Màu thương hiệu – khớp landing page ducit.vn/ai-agent */
  --green:#017114;       /* màu chính */
  --green-600:#015c10; --green-900:#00300a; --green-950:#001d06; --green-soft:#e8f5ea;
  --orange:#F77E2D;      /* Cosmic Orange – màu phụ */
  --orange-600:#c55a14; --orange-soft:#fff1e7;
  --burgundy:#6B1E2E;    /* Đỏ Burgundy – màu phụ (chỉnh lại nếu có mã chính thức) */
  --burgundy-soft:#f8e9ec;

  --navy:var(--green); --navy-2:var(--green-600); --navy-soft:var(--green-soft);
  --gold:var(--orange); --gold-600:var(--orange-600); --gold-soft:var(--orange-soft);
  --bg:#f4f7f4; --card:#fff; --ink:#0f1a12; --muted:#4a5a4e; --line:#e1e9e3;
  --ok:var(--green); --ok-soft:var(--green-soft); --warn:#b34f0c; --warn-soft:var(--orange-soft); --bad:var(--burgundy); --bad-soft:var(--burgundy-soft);
  --radius:16px; --shadow:0 1px 2px rgba(0,48,10,.05),0 6px 20px rgba(0,48,10,.06);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{font-family:"Be Vietnam Pro",system-ui,sans-serif;background:var(--bg);color:var(--ink);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--navy-2);text-decoration:none}
a:hover{text-decoration:underline}
button,input,textarea,select{font:inherit;color:inherit}
button{cursor:pointer}
.boot{display:grid;place-items:center;min-height:100vh;color:var(--muted)}

/* ---------- Khung ---------- */
.shell{display:grid;grid-template-columns:260px minmax(0,1fr) 300px;gap:24px;max-width:1380px;margin:0 auto;padding:20px}
.side{position:sticky;top:20px;align-self:start;background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 12px;height:calc(100vh - 40px);display:flex;flex-direction:column}
.brand{display:flex;align-items:center;gap:10px;padding:4px 8px 14px;border-bottom:1px solid var(--line);margin-bottom:10px}
.brand img{width:38px;height:38px}
.brand b{font-size:15px;line-height:1.2;display:block}
.brand small{color:var(--muted);font-size:12px}
.bell{margin-left:auto;position:relative;width:36px;height:36px;border-radius:10px;border:1px solid var(--line);background:#fff;display:grid;place-items:center}
.bell svg{width:18px;height:18px}
.bell .dot{position:absolute;top:-6px;right:-6px;min-width:20px;height:20px;padding:0 5px;border-radius:10px;background:var(--orange);color:#fff;font-size:11px;font-weight:800;display:grid;place-items:center;border:2px solid #fff}
.nav{flex:1;overflow-y:auto}
.nav h6{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);padding:12px 10px 4px;font-weight:700}
.nav a{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:10px;color:var(--ink);font-weight:500;text-decoration:none}
.nav a:hover{background:var(--bg)}
.nav a.on{background:var(--navy);color:#fff}
.nav a .ic{width:20px;text-align:center}
.nav a .pill{margin-left:auto;background:var(--orange);color:#fff;font-size:11px;font-weight:800;border-radius:999px;padding:1px 8px}
.me{display:flex;align-items:center;gap:10px;border-top:1px solid var(--line);padding:12px 8px 0}
.me .who{min-width:0}
.me b{display:block;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.me small{color:var(--muted);font-size:12px}
.me a{margin-left:auto;font-size:13px;color:var(--muted)}

.avatar{flex:0 0 auto;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font-weight:800;font-size:14px;color:#fff;background:var(--navy-2)}
.avatar.admin{background:linear-gradient(135deg,var(--orange),var(--orange-600));color:#fff}
.avatar.sm{width:28px;height:28px;font-size:12px}

.main{min-width:0}
.rail{position:sticky;top:20px;align-self:start;display:grid;gap:16px}
.topbar{display:none}

/* ---------- Thẻ & chữ ---------- */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}
.card+.card{margin-top:14px}
.page-h{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin:4px 0 16px;flex-wrap:wrap}
.page-h h1{font-family:"Oswald","Be Vietnam Pro",sans-serif;text-transform:uppercase;letter-spacing:.01em;font-size:28px;line-height:1.2}
.page-h p{color:var(--muted)}
h2.sec{font-size:17px;margin:24px 0 10px}
.muted{color:var(--muted)}
.small{font-size:13px}
.tag{display:inline-flex;align-items:center;gap:4px;font-size:12px;font-weight:700;border-radius:999px;padding:3px 10px;background:var(--navy-soft);color:var(--navy-2)}
.tag.gold{background:var(--orange-soft);color:#b34f0c}
.tag.ok{background:var(--ok-soft);color:var(--ok)}
.tag.warn{background:var(--warn-soft);color:var(--warn)}
.tag.bad{background:var(--bad-soft);color:var(--bad)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:10px 18px;font-weight:700;background:var(--navy);color:#fff;text-decoration:none;transition:filter .15s}
.btn:hover{filter:brightness(1.15);text-decoration:none}
.btn.gold{background:var(--orange);color:#fff;box-shadow:0 4px 0 var(--orange-600)}
.btn.gold:hover{filter:brightness(1.05)}
.btn.ghost{background:#fff;color:var(--navy);border:1px solid var(--line)}
.btn.ok{background:var(--ok)}
.btn.warn{background:#fff;color:var(--burgundy);border:1px solid #e6c3cb}
.btn.sm{padding:6px 12px;font-size:13px;border-radius:10px}
.btn:disabled{opacity:.55;cursor:not-allowed}

.field{display:block;margin-bottom:12px}
.field span{display:block;font-weight:600;font-size:14px;margin-bottom:5px}
.field span i{color:var(--bad);font-style:normal}
input[type=text],input[type=url],input[type=password],textarea,select{width:100%;border:1.5px solid var(--line);border-radius:12px;padding:10px 12px;background:#fff;outline:none}
input:focus,textarea:focus,select:focus{border-color:var(--navy-2)}
textarea{min-height:90px;resize:vertical}
.hint{font-size:13px;color:var(--muted);margin-top:4px}
.err{background:var(--bad-soft);color:var(--bad);border-radius:10px;padding:9px 12px;font-size:14px;margin-bottom:10px}

.chips{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 14px;font-weight:600;font-size:14px;text-decoration:none;color:var(--ink)}
.chip:hover{text-decoration:none;border-color:var(--navy-2)}
.chip.on{background:var(--navy);color:#fff;border-color:var(--navy)}
.chip b{margin-left:4px;background:rgba(255,255,255,.2);border-radius:999px;padding:0 7px;font-size:12px}
.chip:not(.on) b{background:var(--bg)}

/* ---------- Bài viết ---------- */
.composer{display:flex;gap:12px;align-items:flex-start}
.composer .box{flex:1}
.composer .open{width:100%;text-align:left;border:1.5px solid var(--line);background:var(--bg);border-radius:12px;padding:11px 14px;color:var(--muted)}
.composer .row{display:flex;gap:8px;align-items:center;margin-top:8px;flex-wrap:wrap}
.composer select{width:auto}
.post{display:block;color:inherit}
.post:hover{text-decoration:none}
.post-h{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.post-h b{font-size:14px}
.post-h small{display:block;color:var(--muted);font-size:12px}
.post-h .acts{margin-left:auto;display:flex;gap:6px;align-items:center}
.post h3{font-size:17px;line-height:1.35;margin-bottom:6px}
.post .body{white-space:pre-line;word-wrap:break-word}
.post .body.clip{display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}
.post-f{display:flex;gap:16px;align-items:center;margin-top:12px;color:var(--muted);font-size:14px}
.post-f button{background:none;border:0;display:inline-flex;align-items:center;gap:6px;color:var(--muted);font-weight:600}
.post-f button.on{color:#d6336c}
.pinned-label{font-size:12px;font-weight:700;color:#b34f0c;display:flex;align-items:center;gap:6px;margin-bottom:8px}
.solved{border:2px solid var(--ok)}
.comment{display:flex;gap:10px;padding:14px 0;border-top:1px solid var(--line)}
.comment:first-child{border-top:0}
.comment .c{flex:1;min-width:0}
.comment .c b{font-size:14px}
.comment .c small{color:var(--muted);font-size:12px;margin-left:6px}
.comment .c p{white-space:pre-line;word-wrap:break-word;margin-top:2px}
.comment .c .ca{display:flex;gap:12px;margin-top:4px;font-size:13px}
.comment .c .ca button{background:none;border:0;color:var(--muted);font-weight:600}
.comment.best{background:var(--ok-soft);border-radius:12px;padding:14px;border-top:0;margin:6px 0}
.linkish{color:var(--navy-2);text-decoration:underline;word-break:break-all}
.empty{text-align:center;color:var(--muted);padding:34px 10px}

/* ---------- Lộ trình ---------- */
.hero{display:grid;grid-template-columns:auto 1fr;gap:22px;align-items:center;background:radial-gradient(700px 320px at 0% 0%,#0a8a22 0%,var(--green-900) 55%,var(--green-950) 100%);color:#fff;border-radius:var(--radius);padding:24px}
.hero .badge{width:120px;height:120px;border-radius:24px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);display:grid;place-items:center;text-align:center}
.hero .badge b{font-size:40px;line-height:1;color:var(--gold);display:block}
.hero .badge small{font-size:12px;opacity:.8}
.hero h1{font-family:"Oswald","Be Vietnam Pro",sans-serif;text-transform:uppercase;letter-spacing:.01em;font-size:26px;line-height:1.2}
.hero .meta{opacity:.8;font-size:14px;margin:2px 0 12px}
.bar{height:10px;background:rgba(255,255,255,.15);border-radius:999px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--gold);border-radius:999px;transition:width .4s}
.card .bar{background:var(--navy-soft)}
.hero .next{margin:10px 0 14px;font-size:14px;opacity:.9}
.hero .row{display:flex;gap:10px;flex-wrap:wrap}
.rules{border:1px solid #fbd3b5;background:var(--orange-soft);border-radius:var(--radius);padding:16px 18px;margin-top:16px}
.rules summary{cursor:pointer;font-weight:800;color:#b34f0c;list-style:none;display:flex;align-items:center;gap:8px}
.rules summary::-webkit-details-marker{display:none}
.rules summary::after{content:"Xem đầy đủ ▾";margin-left:auto;font-size:13px;font-weight:600}
.rules[open] summary::after{content:"Thu gọn ▴"}
.rules ul{margin:10px 0 0 18px;display:grid;gap:6px}
.phase-h{display:flex;align-items:center;gap:10px;margin:26px 0 10px}
.phase-h b{font-size:16px}
.step{display:flex;align-items:center;gap:14px;background:var(--card);border-radius:14px;box-shadow:var(--shadow);padding:14px 16px;color:inherit;margin-bottom:10px;border:1.5px solid transparent}
.step:hover{text-decoration:none;border-color:var(--navy-soft)}
.step .st{flex:0 0 auto;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-weight:800;font-size:14px}
.step.approved .st{background:var(--ok);color:#fff}
.step.pending .st{background:var(--warn-soft);color:var(--warn)}
.step.revise .st{background:var(--bad-soft);color:var(--bad)}
.step.open .st{background:var(--orange);color:#fff}
.step.open{border-color:var(--gold)}
.step.locked{opacity:.6;cursor:default;box-shadow:none;background:#f8f9fc}
.step.locked .st{background:var(--line);color:var(--muted)}
.step.gift{background:var(--orange-soft);border-color:var(--gold);margin-left:22px}
.step.gift .st{background:#fff;font-size:18px}
.step.gift.locked{background:var(--orange-soft);opacity:.75}
.step .t{flex:1;min-width:0}
.step .t .no{font-size:12px;font-weight:700;color:var(--muted);background:var(--bg);border-radius:6px;padding:1px 7px;margin-right:6px}
.step .t b{font-weight:700}
.step .t small{display:block;color:var(--muted);font-size:13px;margin-top:2px}
.step .r{font-size:12px;white-space:nowrap}

.lesson h2{font-size:18px;margin:22px 0 8px}
.lesson p{margin:10px 0}
.lesson ul,.lesson ol{margin:8px 0 8px 22px;display:grid;gap:5px}
.lesson code{background:var(--navy-soft);border-radius:6px;padding:1px 6px;font-size:.92em}
.lesson h3{font-size:16px;margin:18px 0 6px;color:var(--green-900)}
.codeblock{margin:12px 0;border:1px solid #cfe0d3;border-radius:12px;overflow:hidden;background:#0f1a12}
.codeblock .cb-bar{display:flex;align-items:center;justify-content:space-between;gap:8px;background:var(--green-900);color:#cfe8d4;font-size:12px;font-weight:700;padding:6px 10px 6px 14px}
.copy-btn{border:0;border-radius:8px;background:var(--orange);color:#fff;font-weight:700;font-size:12px;padding:5px 12px}
.codeblock pre{margin:0;padding:12px 14px;color:#e8f5ea;font-family:ui-monospace,Consolas,monospace;font-size:13.5px;line-height:1.55;white-space:pre-wrap;word-break:break-word;max-height:420px;overflow:auto}
.callout{margin:12px 0;border-left:4px solid var(--green);background:var(--green-soft);border-radius:0 12px 12px 0;padding:10px 14px;font-size:14.5px}
.callout.warn{border-left-color:var(--burgundy);background:var(--burgundy-soft)}
.goal{background:var(--navy-soft);border-radius:12px;padding:14px 16px;margin:14px 0}
.goal b{color:var(--navy-2)}
.checklist label{display:flex;gap:10px;align-items:flex-start;padding:8px 0;border-bottom:1px dashed var(--line);cursor:pointer}
.checklist label:last-child{border-bottom:0}
.checklist input{margin-top:5px;width:18px;height:18px;accent-color:var(--ok)}
.status-box{border-radius:12px;padding:14px 16px;margin-bottom:14px}
.status-box.ok{background:var(--green-soft);color:var(--green-900)}
.status-box.warn{background:var(--orange-soft);color:#8a3d06}
.status-box.bad{background:var(--burgundy-soft);color:var(--burgundy)}
.sub-item{border-top:1px solid var(--line);padding:12px 0}
.sub-item dl{display:grid;gap:6px;margin-top:6px}
.sub-item dt{font-size:13px;color:var(--muted)}
.sub-item dd{white-space:pre-line;word-wrap:break-word}
.stepnav{display:flex;justify-content:space-between;gap:10px;margin-top:16px}

/* ---------- Cột phải ---------- */
.rail .card{padding:18px}
.cc h3{font-size:17px;display:flex;align-items:center;gap:6px}
.cc p{color:var(--muted);font-size:14px;margin:4px 0 14px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);text-align:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:12px 0;margin-bottom:12px}
.stats.two{grid-template-columns:repeat(2,1fr);margin-bottom:0}
.stats b{display:block;font-size:20px}
.stats span{font-size:12px;color:var(--muted)}
.faces{display:flex;align-items:center}
.faces .avatar{margin-left:-8px;border:2px solid #fff}
.faces .avatar:first-child{margin-left:0}
.support-card{background:linear-gradient(160deg,var(--burgundy),#4a1420);color:#fff}
.support-card p{color:rgba(255,255,255,.8);font-size:14px;margin:6px 0 12px}

/* ---------- Thông báo ---------- */
.notif{position:fixed;z-index:80;top:70px;left:20px;width:340px;max-height:70vh;overflow:auto;background:#fff;border-radius:14px;box-shadow:0 20px 60px rgba(0,29,6,.25);padding:8px}
.notif a{display:block;padding:10px 12px;border-radius:10px;color:var(--ink);font-size:14px}
.notif a:hover{background:var(--bg);text-decoration:none}
.notif a.new{background:var(--gold-soft)}
.notif small{display:block;color:var(--muted);font-size:12px}
#toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(20px);background:var(--green-900);color:#fff;border-radius:12px;padding:10px 18px;font-weight:600;opacity:0;pointer-events:none;transition:.25s;z-index:100;max-width:90vw}
#toast.show{opacity:1;transform:translateX(-50%)}

/* ---------- Đăng nhập ---------- */
.login{min-height:100vh;display:grid;place-items:center;padding:20px;background:radial-gradient(1000px 520px at 50% -10%,#0a8a22 0%,var(--green-900) 50%,var(--green-950) 100%)}
.login .card{width:100%;max-width:400px;padding:30px}
.login .brand{border:0;justify-content:center;flex-direction:column;text-align:center;padding-bottom:6px}
.login .brand img{width:56px;height:56px}
.login .brand b{font-size:19px}

/* ---------- Quản trị ---------- */
.table{width:100%;border-collapse:collapse;font-size:14px}
.table th{text-align:left;font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);padding:8px;border-bottom:1px solid var(--line)}
.table td{padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:middle}
.table-wrap{overflow-x:auto}
.cred{background:var(--ok-soft);border-radius:12px;padding:14px;margin-top:12px}
.cred pre{white-space:pre-wrap;font-family:inherit;background:#fff;border-radius:8px;padding:10px;margin:8px 0}

/* ---------- Tải ảnh khi nộp bài ---------- */
.uploader{border:2px dashed #cfe0d3;border-radius:14px;padding:12px;background:#fbfdfb;transition:.15s}
.uploader.over{border-color:var(--orange);background:var(--orange-soft)}
.uploader .drop{width:100%;border:0;background:transparent;padding:14px 8px;color:var(--ink);font-size:14px;line-height:1.5;text-align:center}
.uploader .drop b{color:var(--green)}
.uploader .drop small{display:block;color:var(--muted);font-size:12px;margin-top:2px}
.thumbs{display:flex;flex-wrap:wrap;gap:10px}
.uploader .thumbs:not(:empty){margin-bottom:6px}
.thumb{position:relative;width:96px;height:96px;border-radius:12px;overflow:hidden;background:var(--green-soft);border:1px solid var(--line)}
.thumb img{width:100%;height:100%;object-fit:cover}
.thumb button{position:absolute;top:4px;right:4px;width:24px;height:24px;border-radius:50%;border:0;background:rgba(0,29,6,.75);color:#fff;font-size:16px;line-height:1}
.thumb.loading{display:grid;place-items:center;font-size:12px;color:var(--muted);animation:pulse 1.2s infinite}
@keyframes pulse{50%{opacity:.5}}
dd .thumbs a{display:block;width:120px;height:120px;border-radius:12px;overflow:hidden;border:1px solid var(--line)}
dd .thumbs img{width:100%;height:100%;object-fit:cover;transition:transform .2s}
dd .thumbs a:hover img{transform:scale(1.04)}

/* ---------- Điện thoại ---------- */
@media (max-width:1180px){
  .shell{grid-template-columns:240px minmax(0,1fr)}
  .rail{display:none}
}
@media (max-width:820px){
  .shell{display:block;padding:12px}
  .topbar{display:flex;align-items:center;gap:10px;position:sticky;top:0;z-index:40;background:rgba(244,247,244,.92);backdrop-filter:blur(8px);padding:10px 12px;margin:-12px -12px 12px;border-bottom:1px solid var(--line)}
  .topbar img{width:30px;height:30px}
  .topbar b{font-size:15px}
  .topbar .menu{width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:#fff;font-size:18px}
  .topbar .bell{margin-left:auto}
  .side{position:fixed;z-index:60;top:0;left:0;bottom:0;height:auto;width:280px;border-radius:0 16px 16px 0;transform:translateX(-105%);transition:transform .25s}
  .side.open{transform:none}
  .scrim{position:fixed;inset:0;background:rgba(0,29,6,.45);z-index:55}
  .side .bell{display:none}
  .hero{grid-template-columns:1fr}
  .hero .badge{width:auto;height:auto;padding:12px;display:flex;gap:10px;align-items:baseline;justify-content:flex-start}
  .card{padding:16px}
  .notif{left:12px;right:12px;width:auto;top:60px}
  .page-h h1{font-size:21px}
}

.faq-item{border-top:1px solid var(--line);padding:8px 0}
.faq-item summary{cursor:pointer;font-weight:600}