/* ===== KHO SKILL VINATAT — style.css ===== */
:root{
  --bg:#0b1020; --bg2:#0f1630; --panel:#131c3a; --panel2:#182247;
  --line:#26315c; --text:#eaf0ff; --muted:#9aa8d0; --muted2:#6b78a3;
  /* Bảng màu theo LOGO VINATAT: xanh dương chủ đạo + 5 màu ngôi sao */
  --gold:#3a86df; --gold2:#2e6db4; --brand:#2e6db4;
  --red:#e5342b; --orange:#f39b1e; --green:#2e9e4c; --blue:#2e6db4; --purple:#a34e9c;
  --c1:#e5342b; --c2:#f39b1e; --c3:#2e9e4c; --c4:#2e6db4; --c5:#a34e9c;
  --radius:16px; --radius-sm:10px;
  --shadow:0 10px 40px rgba(0,0,0,.45);
  --maxw:1180px;
  --font:'Segoe UI',system-ui,-apple-system,Roboto,Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:var(--font);color:var(--text);
  background:radial-gradient(1200px 600px at 80% -10%,rgba(59,130,246,.18),transparent 60%),
             radial-gradient(900px 500px at -5% 10%,rgba(168,85,247,.14),transparent 55%),
             var(--bg);
  min-height:100vh;line-height:1.55;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* Header */
.site-header{position:sticky;top:0;z-index:40;backdrop-filter:blur(10px);
  background:rgba(11,16,32,.72);border-bottom:1px solid var(--line)}
.hbar{display:flex;align-items:center;gap:18px;height:66px}
.logo{display:flex;align-items:center;gap:11px;font-weight:800;letter-spacing:.3px}
.logo .star{height:38px;width:auto;flex:0 0 auto}
.logo b{font-size:18px}
.logo span{color:var(--gold);font-size:11px;display:block;font-weight:700;letter-spacing:2px;margin-top:-2px}
.hnav{margin-left:auto;display:flex;gap:6px;flex-wrap:wrap}
.hnav a{padding:8px 14px;border-radius:999px;color:var(--muted);font-weight:600;font-size:14px}
.hnav a:hover{color:var(--text);background:var(--panel)}

/* Hero */
.hero{padding:64px 0 34px;text-align:center}
.badge{display:inline-flex;align-items:center;gap:8px;padding:7px 15px;border:1px solid var(--line);
  border-radius:999px;background:var(--panel);color:var(--gold);font-weight:700;font-size:12.5px;letter-spacing:1px}
.hero h1{font-size:clamp(30px,5vw,52px);line-height:1.08;margin:22px 0 14px;font-weight:900;letter-spacing:-.5px}
.hero h1 em{font-style:normal;background:linear-gradient(120deg,var(--gold),#ffe08a);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{max-width:640px;margin:0 auto;color:var(--muted);font-size:17px}
.hero .cta{margin-top:26px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 22px;border-radius:12px;font-weight:800;
  cursor:pointer;border:1px solid transparent;font-size:15px;transition:.15s}
.btn-gold{background:linear-gradient(120deg,var(--gold),var(--gold2));color:#fff}
.btn-gold:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn-ghost{background:var(--panel);border-color:var(--line);color:var(--text)}
.btn-ghost:hover{background:var(--panel2)}
.stats{display:flex;gap:34px;justify-content:center;margin-top:34px;flex-wrap:wrap}
.stat b{display:block;font-size:26px;font-weight:900;color:var(--gold)}
.stat span{color:var(--muted2);font-size:12.5px;letter-spacing:1px;text-transform:uppercase}

/* Toolbar */
.toolbar{display:flex;gap:12px;align-items:center;margin:30px 0 8px;flex-wrap:wrap}
.search{flex:1;min-width:240px;display:flex;align-items:center;gap:10px;background:var(--panel);
  border:1px solid var(--line);border-radius:12px;padding:11px 15px}
.search input{flex:1;background:none;border:none;outline:none;color:var(--text);font-size:15px}
.search input::placeholder{color:var(--muted2)}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 26px}
.chip{padding:8px 15px;border-radius:999px;border:1px solid var(--line);background:var(--panel);
  color:var(--muted);font-weight:700;font-size:13.5px;cursor:pointer;transition:.13s;white-space:nowrap}
.chip:hover{color:var(--text)}
.chip.active{background:linear-gradient(120deg,var(--gold),var(--gold2));color:#fff;border-color:transparent}
.chip .n{opacity:.6;margin-left:5px;font-size:12px}

/* Grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px;padding-bottom:60px}
.card{background:linear-gradient(180deg,var(--panel),var(--bg2));border:1px solid var(--line);
  border-radius:var(--radius);padding:20px;display:flex;flex-direction:column;gap:12px;transition:.16s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-3px);border-color:#3a4a86;box-shadow:var(--shadow)}
.card .cat{font-size:11px;font-weight:800;letter-spacing:1px;text-transform:uppercase;padding:4px 10px;
  border-radius:999px;align-self:flex-start;color:#fff}
.card h3{margin:0;font-size:18.5px;font-weight:800;line-height:1.25}
.card .desc{color:var(--muted);font-size:14px;margin:0;flex:1}
.card .foot{display:flex;align-items:center;justify-content:space-between;margin-top:4px}
.card .src{font-size:12px;color:var(--muted2);display:flex;align-items:center;gap:6px}
.card .arrow{color:var(--gold);font-weight:800;font-size:14px}
.card .ribbon{position:absolute;top:14px;right:-30px;transform:rotate(45deg);background:var(--c3);
  color:#04240f;font-size:10px;font-weight:900;letter-spacing:1px;padding:4px 36px}

.empty{grid-column:1/-1;text-align:center;color:var(--muted);padding:60px 0}

/* Footer */
.site-footer{border-top:1px solid var(--line);padding:34px 0;color:var(--muted2);font-size:13.5px}
.site-footer .row{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center}
.site-footer a{color:var(--muted)}
.site-footer a:hover{color:var(--gold)}

/* ===== Skill detail page ===== */
.detail{padding:34px 0 70px}
.back{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-weight:700;font-size:14px;margin-bottom:22px}
.back:hover{color:var(--gold)}
.dhead{display:flex;gap:18px;align-items:flex-start;flex-wrap:wrap;border-bottom:1px solid var(--line);padding-bottom:24px;margin-bottom:26px}
.dhead .cat{font-size:11px;font-weight:800;letter-spacing:1px;text-transform:uppercase;padding:5px 12px;border-radius:999px;color:#fff}
.dhead h1{font-size:clamp(26px,4vw,38px);margin:12px 0 8px;font-weight:900}
.dhead p{color:var(--muted);font-size:16px;margin:0;max-width:720px}
.dactions{display:flex;gap:10px;margin-left:auto;flex-wrap:wrap}
.layout{display:grid;grid-template-columns:1fr 300px;gap:34px}
@media(max-width:900px){.layout{grid-template-columns:1fr}}
.content{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:30px 34px;min-width:0}
.content h1,.content h2,.content h3{color:var(--text);margin-top:1.6em}
.content h1{font-size:26px;border-bottom:1px solid var(--line);padding-bottom:.3em}
.content h2{font-size:21px}
.content h3{font-size:17px}
.content p,.content li{color:#d3ddf7;font-size:15px}
.content code{background:#0a0f22;border:1px solid var(--line);border-radius:6px;padding:2px 6px;font-size:13.5px;color:var(--gold)}
.content pre{background:#0a0f22;border:1px solid var(--line);border-radius:10px;padding:16px;overflow:auto}
.content pre code{border:none;background:none;color:#cfe0ff}
.content blockquote{border-left:3px solid var(--gold);margin:1em 0;padding:.4em 1em;color:var(--muted);background:var(--bg2);border-radius:0 8px 8px 0}
.content table{border-collapse:collapse;width:100%;margin:1em 0;font-size:14px}
.content th,.content td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.content th{background:var(--panel2)}
.content a{color:var(--gold);text-decoration:underline}
.aside{align-self:start;position:sticky;top:86px;display:flex;flex-direction:column;gap:16px}
.box{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.box h4{margin:0 0 12px;font-size:13px;letter-spacing:1px;text-transform:uppercase;color:var(--gold)}
.box .kv{display:flex;justify-content:space-between;gap:10px;font-size:14px;padding:6px 0;border-bottom:1px dashed var(--line)}
.box .kv:last-child{border:none}
.box .kv span{color:var(--muted2)}
.upgrade li{color:#d3ddf7;font-size:14px;margin-bottom:8px}
.upgrade{padding-left:18px;margin:0}
.howto{background:#0a0f22;border-radius:8px;padding:12px 14px;font-size:13px;color:var(--muted);font-family:ui-monospace,Consolas,monospace;overflow:auto;border:1px solid var(--line)}
.toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%) translateY(20px);opacity:0;
  background:var(--c3);color:#04240f;font-weight:800;padding:12px 22px;border-radius:12px;transition:.25s;z-index:60}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}