/* ===== Themes ===== */
:root, [data-theme="light"] {
  --bg:#f6f7fb; --surface:#ffffff; --surface-2:#eceffa; --text:#161a2b; --muted:#646b86; --border:#e1e5f1;
  --accent:#4f46e5; --accent-2:#06b6d4; --on-accent:#fff; --shadow:0 14px 34px -14px rgba(40,50,110,.28);
  --hero:linear-gradient(135deg,#eef0ff 0%,#e2f6ff 100%);
}
[data-theme="dark"] {
  --bg:#0b0f1a; --surface:#131a2b; --surface-2:#1b2438; --text:#e8ecf6; --muted:#97a1ba; --border:#25304a;
  --accent:#7c8cff; --accent-2:#22d3ee; --on-accent:#0b0f1a; --shadow:0 14px 34px -14px rgba(0,0,0,.7);
  --hero:linear-gradient(135deg,#151d3a 0%,#0c2a37 100%);
}
[data-theme="ocean"] {
  --bg:#06202b; --surface:#0b2e3d; --surface-2:#103c4f; --text:#e4f6fb; --muted:#8fb7c4; --border:#1a4a5e;
  --accent:#2dd4bf; --accent-2:#38bdf8; --on-accent:#032027; --shadow:0 14px 34px -14px rgba(0,0,0,.6);
  --hero:linear-gradient(135deg,#0b3a4d 0%,#064e55 100%);
}
[data-theme="sunset"] {
  --bg:#fff4ea; --surface:#ffffff; --surface-2:#ffe6d2; --text:#2b1a14; --muted:#8a6a5c; --border:#f6d6bf;
  --accent:#f2542d; --accent-2:#f6a21e; --on-accent:#fff; --shadow:0 14px 34px -14px rgba(160,70,30,.35);
  --hero:linear-gradient(135deg,#ffe3cc 0%,#ffd1d9 100%);
}
[data-theme="forest"] {
  --bg:#0e1a13; --surface:#14261c; --surface-2:#1c3527; --text:#e6f4ea; --muted:#92b3a0; --border:#27442f;
  --accent:#4ade80; --accent-2:#a3e635; --on-accent:#06210f; --shadow:0 14px 34px -14px rgba(0,0,0,.65);
  --hero:linear-gradient(135deg,#153524 0%,#1d3a1a 100%);
}
[data-theme="rose"] {
  --bg:#fff1f5; --surface:#ffffff; --surface-2:#ffe0ea; --text:#2a1320; --muted:#8c6477; --border:#f7cfdc;
  --accent:#e11d6a; --accent-2:#a855f7; --on-accent:#fff; --shadow:0 14px 34px -14px rgba(180,30,90,.3);
  --hero:linear-gradient(135deg,#ffdce8 0%,#ecdcff 100%);
}

/* ===== Base ===== */
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:400 16px/1.75 'Noto Sans Thai',system-ui,-apple-system,'Segoe UI',sans-serif;
  transition:background .25s,color .25s;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:'Prompt','Noto Sans Thai',sans-serif;line-height:1.3;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,4vw,2.8rem)} h2{font-size:1.5rem} h3{font-size:1.15rem}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
.container{width:min(1120px,92%);margin-inline:auto}
.narrow{width:min(780px,92%)}
.center{text-align:center}
.muted{color:var(--muted)}
main{padding:32px 0 56px;min-height:60vh}
section{margin-block:44px}

/* ===== Header ===== */
header.site{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid var(--border)}
.bar{display:flex;align-items:center;gap:20px;height:64px}
.brand{font:700 1.2rem 'Prompt',sans-serif;color:var(--text);display:flex;align-items:center;gap:8px}
.brand:hover{text-decoration:none}
.logo{display:grid;place-items:center;width:32px;height:32px;border-radius:10px;color:var(--on-accent);
  background:linear-gradient(135deg,var(--accent),var(--accent-2));font-size:1rem}
nav#nav{margin-left:auto}
nav#nav ul{list-style:none;display:flex;gap:4px;margin:0;padding:0}
nav#nav a{display:block;padding:8px 14px;border-radius:999px;color:var(--muted);font-weight:500}
nav#nav a:hover{background:var(--surface-2);color:var(--text);text-decoration:none}
nav#nav a.active{background:var(--accent);color:var(--on-accent)}
.tools{display:flex;gap:8px;align-items:center}
.icon-btn{width:40px;height:40px;border-radius:12px;border:1px solid var(--border);background:var(--surface);color:var(--text);
  font-size:1.1rem;cursor:pointer;transition:.15s}
.icon-btn:hover{border-color:var(--accent);transform:translateY(-1px)}
.burger{display:none}
.theme-wrap{position:relative}
.theme-pop{position:absolute;right:0;top:48px;min-width:190px;background:var(--surface);border:1px solid var(--border);
  border-radius:16px;box-shadow:var(--shadow);padding:8px;display:grid;gap:2px}
.theme-pop[hidden]{display:none}
.theme-pop button{display:flex;align-items:center;gap:10px;border:0;background:none;color:var(--text);font:inherit;
  padding:8px 10px;border-radius:10px;cursor:pointer;text-align:left}
.theme-pop button:hover,.theme-pop button.on{background:var(--surface-2)}
.theme-pop button.on::after{content:'✓';margin-left:auto;color:var(--accent)}
.sw{width:22px;height:22px;border-radius:50%;border:2px solid var(--border);flex:none}

/* ===== Hero ===== */
.hero{background:var(--hero);border-bottom:1px solid var(--border);position:relative;overflow:hidden}
.hero::before,.hero::after{content:'';position:absolute;border-radius:50%;filter:blur(70px);opacity:.45;pointer-events:none}
.hero::before{width:340px;height:340px;background:var(--accent);top:-120px;right:-60px}
.hero::after{width:280px;height:280px;background:var(--accent-2);bottom:-140px;left:8%}
.hero-in{position:relative;padding:84px 0 92px;max-width:760px;margin-left:max(4%,calc((100% - 1120px)/2))}
.pill{display:inline-block;padding:4px 14px;border-radius:999px;background:var(--surface);border:1px solid var(--border);
  font-size:.85rem;color:var(--muted);margin-bottom:18px}
.hero h1{font-size:clamp(2.2rem,6vw,3.8rem);background:linear-gradient(120deg,var(--text) 30%,var(--accent));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:1.15rem;color:var(--muted);max-width:62ch}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:12px;border:1px solid transparent;
  background:var(--accent);color:var(--on-accent);font:500 1rem 'Noto Sans Thai',sans-serif;cursor:pointer;transition:.15s}
.btn:hover{text-decoration:none;transform:translateY(-1px);box-shadow:var(--shadow);filter:brightness(1.05)}
.btn.ghost{background:transparent;color:var(--text);border-color:var(--border)}
.btn.ghost:hover{border-color:var(--accent)}

/* ===== Cards ===== */
.section-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:18px}
.section-head h2{margin:0}
.page-head{margin-bottom:24px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:22px}
.card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--border);border-radius:20px;
  overflow:hidden;color:var(--text);transition:.2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--accent);text-decoration:none}
.card-img{position:relative;aspect-ratio:16/10;background:var(--surface-2);overflow:hidden}
.card-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.card:hover .card-img img{transform:scale(1.05)}
.ph{display:grid;place-items:center;height:100%;font-size:2.6rem;color:var(--on-accent);
  background:linear-gradient(135deg,var(--accent),var(--accent-2))}
.badge{position:absolute;left:12px;top:12px;padding:2px 12px;border-radius:999px;font-size:.78rem;font-weight:600;
  background:var(--surface);color:var(--accent);border:1px solid var(--border)}
.badge.static{position:static;display:inline-block}
.card-body{padding:16px 18px 20px}
.card-body h3{margin-bottom:6px}
.card-body p{margin:0 0 10px;color:var(--muted);font-size:.95rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-body small{color:var(--muted)}

.chips{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:22px}
.chip{padding:6px 16px;border-radius:999px;background:var(--surface);border:1px solid var(--border);color:var(--text);font-size:.92rem}
.chip:hover{border-color:var(--accent);text-decoration:none}
.chip.on{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}
.pager{display:flex;gap:6px;justify-content:center;margin-top:32px}
.pager a{min-width:38px;height:38px;display:grid;place-items:center;border-radius:10px;background:var(--surface);border:1px solid var(--border);color:var(--text)}
.pager a.on{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}

/* ===== Article ===== */
.crumbs{font-size:.9rem;color:var(--muted);margin-bottom:12px}
.meta{color:var(--muted);display:flex;gap:10px;align-items:center;margin:0 0 20px}
.cover{width:100%;border-radius:20px;border:1px solid var(--border);margin:0 0 22px;box-shadow:var(--shadow)}
.prose{font-size:1.05rem}
.prose h2{margin-top:1.8em} .prose h3{margin-top:1.5em}
.prose img{border-radius:14px;margin:1em auto;display:block;border:1px solid var(--border)}
.prose blockquote{margin:1.2em 0;padding:.4em 1.2em;border-left:4px solid var(--accent);background:var(--surface);border-radius:0 12px 12px 0;color:var(--muted)}
.prose code{background:var(--surface-2);padding:.1em .4em;border-radius:6px;font-size:.92em}
.prose pre{background:var(--surface);border:1px solid var(--border);padding:14px 16px;border-radius:14px;overflow:auto}
.prose pre code{background:none;padding:0}
.prose table{border-collapse:collapse;width:100%;margin:1em 0}
.prose th,.prose td{border:1px solid var(--border);padding:8px 12px;text-align:left}
.prose hr{border:0;border-top:1px solid var(--border);margin:2em 0}
.video{position:relative;aspect-ratio:16/9;margin:1.4em 0;border-radius:18px;overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow);background:#000}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.code-block{position:relative}
.code-block pre{margin:0;background:#0d1117;color:#e6edf3;border-radius:16px;padding:18px;overflow:auto;font:14px/1.6 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;border:1px solid var(--border)}
.copy-btn{position:absolute;right:10px;top:10px;z-index:1;border:1px solid #30363d;background:#161b22;color:#c9d1d9;border-radius:8px;padding:4px 12px;cursor:pointer;font:inherit;font-size:.85rem}
.copy-btn:hover{background:#21262d}

/* ===== Footer & misc ===== */
footer.site{border-top:1px solid var(--border);background:var(--surface);padding:32px 0 20px}
.foot{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.foot p{margin:4px 0 0}
.social{display:flex;gap:16px;align-items:center}
.copy{font-size:.85rem;margin-top:20px}
.flash{padding:10px 16px;border-radius:12px;margin:12px 0;border:1px solid var(--border)}
.flash.ok{background:color-mix(in srgb,#22c55e 16%,var(--surface));border-color:#22c55e}
.flash.err{background:color-mix(in srgb,#ef4444 14%,var(--surface));border-color:#ef4444}
.edit-fab{position:fixed;right:18px;bottom:18px;z-index:60;background:var(--accent);color:var(--on-accent);padding:10px 18px;border-radius:999px;box-shadow:var(--shadow);font-weight:500}
.edit-fab:hover{text-decoration:none;filter:brightness(1.08)}

@media (max-width:760px){
  .burger{display:block}
  nav#nav{position:absolute;left:0;right:0;top:64px;background:var(--bg);border-bottom:1px solid var(--border);display:none;padding:10px 4%}
  nav#nav.open{display:block}
  nav#nav ul{flex-direction:column}
  .hero-in{padding:56px 0 64px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}