:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --ink: #0f172a;
  --muted: #5b6475;
  --line: #e2e7f0;
  --ptt: #1d4ed8;
  --bcp: #15803d;
  --up: #b91c1c;
  --down: #15803d;
  --hero: #0f172a;
  font-family: "IBM Plex Sans Thai", system-ui, sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --card: #121a2e;
    --ink: #e8edf7;
    --muted: #9aa5ba;
    --line: #233049;
    --ptt: #7aa2ff;
    --bcp: #4ade80;
    --up: #f87171;
    --down: #4ade80;
    --hero: #060a16;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--ink); font-size: 16px; line-height: 1.6; }
a { color: var(--ptt); }
button { font: inherit; cursor: pointer; }
code { font: 13px "JetBrains Mono", monospace; background: var(--line); padding: 1px 5px; border-radius: 4px; word-break: break-all; }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
b.ptt, th.ptt, .legend .ptt { color: var(--ptt); }
b.bcp, th.bcp, .legend .bcp { color: var(--bcp); }

.hero { background: var(--hero); color: #fff; padding: 36px 0 30px; }
.hero h1 { font-size: clamp(34px, 6vw, 52px); line-height: 1.15; margin: 6px 0 4px; }
.hero .sub { margin: 0; color: #c7d0e0; min-height: 1.6em; }
.hero b.ptt { color: #9db8ff; }
.hero b.bcp { color: #7ee2a0; }
.kicker { margin: 0; display: flex; align-items: center; gap: 8px; color: #c7d0e0; font-size: 14px; }
.live { width: 9px; height: 9px; border-radius: 50%; background: #22c55e; box-shadow: 0 0 0 4px #22c55e33; }

main.wrap { padding-top: 20px; }
section { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px 20px; margin-bottom: 18px; }
h2 { font-size: 20px; margin: 0 0 10px; }

.alert { background: #fff7ed; color: #9a3412; border: 1px solid #fed7aa; border-radius: 12px; padding: 12px 16px; margin-top: 12px; font-weight: 600; }
@media (prefers-color-scheme: dark) { .alert { background: #2a1a0c; color: #fdba74; border-color: #7c2d12; } }
.alert ul { margin: 6px 0 0; padding-left: 1.2em; font-weight: 500; }

.prices { width: 100%; border-collapse: collapse; }
.prices th { font-size: 14px; font-weight: 600; text-align: right; padding: 6px 8px; border-bottom: 2px solid var(--line); }
.prices th:first-child { text-align: left; color: var(--muted); }
/* Fixed row height: Thai fonts have tall metrics, so when the web font replaces the fallback
   the line boxes change size; a fixed height keeps the table (and everything below) still. */
.prices th { height: 40px; }
.prices td { height: 58px; padding: 4px 8px; border-bottom: 1px solid var(--line); text-align: right; vertical-align: middle; line-height: 1.35; }
.prices td:first-child { text-align: left; font-weight: 500; }
.prices .num { font: 700 22px/1.2 "JetBrains Mono", monospace; letter-spacing: -.5px; }
.prices .cheap { display: inline-block; font: 600 11px "IBM Plex Sans Thai", sans-serif; color: var(--down); border: 1px solid currentColor; border-radius: 99px; padding: 0 6px; margin-right: 6px; vertical-align: 3px; }
.prices .na { color: var(--muted); font-size: 14px; }
.prices .ph { color: var(--line); }
.prices .diff { font: 500 14px "JetBrains Mono", monospace; color: var(--muted); }
.prices .tm { display: block; font: 600 12px "IBM Plex Sans Thai", sans-serif; }
.tm.up { color: var(--up); }
.tm.down { color: var(--down); }
.note { margin: 10px 0 0; font-size: 13px; color: var(--muted); }
@media (max-width: 560px) {
  section { padding: 14px 12px; }
  .prices .num { font-size: 18px; }
  .prices td, .prices th { padding-left: 4px; padding-right: 4px; }
  .prices td:first-child { font-size: 14px; }
  .prices .diff { display: none; }  /* the "ถูกกว่า" badge already says which brand is cheaper */
}

.chart-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.seg button { background: none; border: 0; color: var(--muted); padding: 5px 12px; font-size: 14px; }
.seg button.on { background: var(--ink); color: var(--card); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0 6px; }
.chips button { background: none; color: var(--ink); border: 1px solid var(--line); border-radius: 99px; padding: 4px 12px; font-size: 14px; }
.chips button.on { background: var(--ink); color: var(--card); border-color: var(--ink); }
.chart { position: relative; height: 300px; }
.chart svg { display: block; width: 100%; height: 100%; overflow: visible; }
.chart .grid line { stroke: var(--line); }
.chart .axis text { fill: var(--muted); font: 12px "JetBrains Mono", monospace; }
.chart .s-ptt { stroke: var(--ptt); }
.chart .s-bcp { stroke: var(--bcp); }
.chart path { fill: none; stroke-width: 2.4; stroke-linejoin: round; }
.chart .cursor { stroke: var(--muted); stroke-dasharray: 3 3; }
.tip { position: absolute; pointer-events: none; background: var(--ink); color: var(--card); font-size: 13px; padding: 6px 9px; border-radius: 8px; white-space: nowrap; transform: translate(-50%, -110%); }
.legend { margin: 8px 0 0; font-size: 14px; display: flex; gap: 14px; flex-wrap: wrap; }

.dl { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.btn { display: inline-block; text-decoration: none; color: var(--ink); border: 1px solid var(--line); border-radius: 10px; padding: 8px 14px; font-weight: 600; }
.btn.primary { background: var(--bcp); border-color: var(--bcp); color: #fff; }
@media (prefers-color-scheme: dark) { .btn.primary { color: #052e16; } }

.flow { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; counter-reset: s; }
.flow li { border: 1px solid var(--line); border-radius: 12px; padding: 12px; counter-increment: s; }
.flow li::before { content: counter(s); display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--ink); color: var(--card); font-weight: 700; font-size: 13px; margin-bottom: 6px; }
.flow b { display: block; }
.flow span { font-size: 14px; color: var(--muted); }
@media (max-width: 760px) { .flow { grid-template-columns: 1fr 1fr; } }
@media (max-width: 460px) { .flow { grid-template-columns: 1fr; } }

.foot { padding-top: 6px; padding-bottom: 36px; font-size: 14px; }
.foot p { margin: 4px 0; }