/* ============================================================
   F2O — industrial / hazard-yellow design system (dark-first)
   ============================================================ */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root[data-theme="dark"] {
  --bg: #0b0c0e; --panel: #121418; --panel2: #16181d;
  --ink: #eceded; --dim: #969ca6; --line: #23262c; --line2: #2e323a;
  --hz: #f5c518; --hz-ink: #0b0c0e; --hz-dim: rgba(245, 197, 24, .55);
  --no: #e5484d; --code-bg: #0e1013; --code-ink: #d8dbe0;
  --hz-text: #f5c518;
}
:root[data-theme="light"] {
  --bg: #fafafa; --panel: #ffffff; --panel2: #f3f4f6;
  --ink: #17181c; --dim: #5c6470; --line: #e2e4e9; --line2: #cfd3da;
  --hz: #f5c518; --hz-ink: #17181c; --hz-dim: #a1780a;
  --no: #b3261e; --code-bg: #17181c; --code-ink: #e8eaed;
  --hz-text: #8a6400;
}

:root { --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
  "Noto Sans Thai", "Sukhumvit Set", "Thonburi", sans-serif; }

html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg); color: var(--ink);
  line-height: 1.75; font-size: 16px;
  transition: background .2s, color .2s;
}
.wrap { max-width: 920px; margin: 0 auto; padding: 0 22px; }

[data-lang="th"] .lang-en { display: none; }
[data-lang="en"] .lang-th { display: none; }
[data-theme="dark"] .on-light { display: none; }
[data-theme="light"] .on-dark { display: none; }

/* hazard stripe motif — used sparingly */
.hazard { height: 6px;
  background: repeating-linear-gradient(-45deg, var(--hz) 0 10px, transparent 10px 20px);
  opacity: .9; }

/* ---------- header ---------- */
.top { position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; justify-content: space-between; height: 58px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: ui-monospace, Menlo, monospace; }
.brand-badge { background: var(--hz); color: var(--hz-ink); font-weight: 800;
  padding: 2px 9px; border-radius: 6px; letter-spacing: .5px; }
.brand-sub { color: var(--dim); font-size: .85em; letter-spacing: 1px; }
.controls { display: flex; gap: 8px; }
.ctl { font-family: ui-monospace, Menlo, monospace; font-size: .8em;
  color: var(--ink); background: var(--panel); border: 1px solid var(--line2);
  border-radius: 7px; padding: 5px 12px; cursor: pointer; text-decoration: none; line-height: 1.5; }
.ctl:hover { border-color: var(--hz); color: var(--hz-text); }

/* ---------- section scaffolding ---------- */
section { padding: 40px 0 36px; border-top: 1px solid var(--line); }
.kicker { font-family: ui-monospace, Menlo, monospace; font-size: .72rem;
  letter-spacing: 3px; color: var(--hz-text); text-transform: uppercase;
  display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.kicker::after { content: ""; flex: 1; height: 1px; background: var(--line2); }
h2 { font-size: 1.45rem; letter-spacing: -.2px; margin-bottom: 18px; }

/* ---------- hero ---------- */
.hero { padding: 68px 0 46px; border-top: none; }
h1 { font-size: clamp(1.8rem, 4.6vw, 2.9rem); line-height: 1.3; letter-spacing: -.8px; }
h1 em { font-style: normal; color: var(--hz-text); }
.lead { margin-top: 20px; color: var(--dim); max-width: 660px; }
.lead b { color: var(--ink); }
.tagline { margin-top: 16px; font-style: italic; color: var(--dim);
  border-left: 3px solid var(--hz); padding: 2px 0 2px 14px; }
.cta { margin-top: 30px; display: flex; gap: 10px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 10px 20px; border-radius: 8px; text-decoration: none;
  font-family: ui-monospace, Menlo, monospace; font-size: .88em;
  color: var(--ink); border: 1px solid var(--line2); background: var(--panel); }
.btn:hover { border-color: var(--hz); color: var(--hz-text); }
.btn.primary { background: var(--hz); color: var(--hz-ink); border-color: var(--hz); font-weight: 700; }
.btn.primary:hover { filter: brightness(1.06); color: var(--hz-ink); }

/* ---------- install cards ---------- */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 20px 22px; margin-bottom: 14px; }
.card-head { display: flex; gap: 13px; align-items: flex-start; margin-bottom: 12px; }
.badge { flex: 0 0 auto; min-width: 30px; height: 30px; border-radius: 7px;
  background: var(--hz); color: var(--hz-ink); font-weight: 800;
  font-family: ui-monospace, Menlo, monospace;
  display: flex; align-items: center; justify-content: center; padding: 0 8px; }
.rec { font-family: ui-monospace, Menlo, monospace; font-size: .68em; color: var(--hz-text);
  border: 1px solid var(--hz-dim); border-radius: 99px; padding: 2px 10px;
  margin-left: 8px; vertical-align: 2px; letter-spacing: 1px; text-transform: uppercase; }
.small { font-size: .88em; }
.dim { color: var(--dim); }

/* ---------- code + copy ---------- */
.code { position: relative; background: var(--code-bg); color: var(--code-ink);
  border: 1px solid var(--line2); border-left: 3px solid var(--hz);
  border-radius: 8px; padding: 14px 92px 14px 18px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .82em; line-height: 1.75; overflow-x: auto; white-space: pre; margin: 10px 0; }
.copy-btn { position: absolute; top: 9px; right: 9px; font-family: inherit; font-size: .82em;
  background: transparent; color: var(--dim);
  border: 1px solid var(--line2); border-radius: 6px; padding: 3px 11px; cursor: pointer; }
.copy-btn:hover { border-color: var(--hz); color: var(--hz); }
.copy-btn.done { color: var(--hz); border-color: var(--hz); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .85em;
  background: color-mix(in srgb, var(--hz) 13%, transparent);
  color: var(--hz-text); border-radius: 5px; padding: 1px 6px; }
.code code { background: none; color: inherit; padding: 0; }
.note { background: var(--panel2); border: 1px solid var(--line); border-left: 3px solid var(--hz);
  border-radius: 8px; padding: 13px 17px; font-size: .92em; margin-top: 10px; }

/* ---------- layer tiles ---------- */
.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; }
.tile { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; }
.tile-k { font-family: ui-monospace, Menlo, monospace; color: var(--hz-text); font-weight: 700;
  font-size: .72em; letter-spacing: 2.5px; text-transform: uppercase; margin-bottom: 8px; }

/* ---------- comparison table ---------- */
.tbl-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; }
table { width: 100%; border-collapse: collapse; font-size: .9em; min-width: 660px; }
th { text-align: left; background: var(--panel2); padding: 11px 15px;
  border-bottom: 1px solid var(--line2); font-family: ui-monospace, Menlo, monospace;
  font-size: .78em; letter-spacing: 1.5px; text-transform: uppercase; color: var(--dim); }
td { padding: 10px 15px; border-bottom: 1px solid var(--line); vertical-align: top; background: var(--panel); }
tr:last-child td { border-bottom: none; }
td.no::before { content: "✗  "; color: var(--no); font-weight: 700; }
td.ok::before { content: "✓  "; color: var(--hz-text); font-weight: 700; }
td.no { color: var(--dim); }

/* ---------- skill cards: 3 stacked lines ---------- */
.skills { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 12px; }
.sk { border: 1px solid var(--line); border-radius: 12px; padding: 15px 17px;
  background: var(--panel); display: flex; flex-direction: column; gap: 3px; }
.sk-cmd { font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 1.02em; font-weight: 700; color: var(--hz-text); letter-spacing: .3px; }
.sk-full { font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .74em; color: var(--dim); word-break: break-all; }
.sk p { font-size: .86em; color: var(--dim); margin-top: 7px; }

/* ---------- FAQ ---------- */
.faq { border: 1px solid var(--line); border-radius: 10px; background: var(--panel);
  padding: 14px 18px; margin-bottom: 10px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq summary::marker { color: var(--hz-text); }
.faq[open] { border-color: var(--line2); }
.faq p { margin-top: 9px; font-size: .92em; color: var(--dim); }
.faq p b { color: var(--ink); }

/* ---------- nerd zone ---------- */
.nerd-box { border: 1px solid var(--line2); border-radius: 14px; overflow: hidden;
  background: var(--panel); margin-top: 10px; }
.nerd-head { padding: 22px 24px 14px; }
.nerd-head h2 { margin-bottom: 6px; }
.nerd-head .dim { font-size: .92em; }
.nerd-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
@media (max-width: 680px) { .nerd-grid { grid-template-columns: 1fr; } }
.nerd-cell { padding: 20px 24px; border-top: 1px solid var(--line); }
.nerd-cell:nth-child(2n) { border-left: 1px solid var(--line); }
@media (max-width: 680px) { .nerd-cell:nth-child(2n) { border-left: none; } }
.nerd-k { font-family: ui-monospace, Menlo, monospace; font-size: .7em; letter-spacing: 2.5px;
  text-transform: uppercase; color: var(--hz-text); margin-bottom: 8px; }
.nerd-cell ul { list-style: none; }
.nerd-cell li { font-size: .85em; color: var(--dim); padding-left: 16px; position: relative; margin: 5px 0; }
.nerd-cell li::before { content: "▸"; position: absolute; left: 0; color: var(--hz-dim); }
.nerd-cell li b, .nerd-cell li code { color: var(--ink); background: none; padding: 0; }
.nerd-cell a { color: var(--hz-text); text-decoration: none; font-family: ui-monospace, Menlo, monospace; }
.nerd-cell a:hover { text-decoration: underline; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); margin-top: 34px; }
.foot { padding: 28px 22px 44px; display: flex; flex-direction: column; gap: 8px;
  font-size: .84em; color: var(--dim); font-family: ui-monospace, Menlo, monospace; }
.foot a { color: var(--hz-text); text-decoration: none; }

@media (max-width: 560px) {
  .hero { padding: 44px 0 30px; }
  .code { padding-right: 18px; padding-top: 42px; }
  .copy-btn { top: 7px; right: 7px; }
  .brand-sub { display: none; }
}

/* Thai text inside mono/letterspaced labels: mono fonts carry no Thai glyphs,
   so per-glyph fallback + wide tracking breaks the script — give Thai spans the
   proper sans stack and sane spacing (Latin keeps the industrial mono look). */
.nerd-k .lang-th, th .lang-th, .kicker .lang-th, .tile-k .lang-th, .foot .lang-th,
.nerd-head .lang-th, .brand-sub .lang-th {
  font-family: var(--sans); letter-spacing: .4px; font-weight: 700;
}
th .lang-th { font-weight: 600; }
.foot .lang-th { font-weight: 400; }