@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=Noto+Sans+Thai:wght@400;500;600;700&family=Noto+Serif+Thai:wght@500;600;700&display=swap");

:root {
  --navy: #06111f;
  --navy-soft: #10253c;
  --paper: #f2f0ea;
  --paper-deep: #e8e5dc;
  --white: #fffefa;
  --ink: #14202c;
  --muted: #5d6973;
  --line: #d3d0c6;
  --copper: #a85f29;
  --teal: #5ec9bc;
  --container: 1240px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Noto Sans Thai", system-ui, sans-serif; line-height: 1.72; }
a { color: #70401e; text-decoration-thickness: 1px; text-underline-offset: 3px; }
img { display: block; max-width: 100%; height: auto !important; margin: 30px auto; }
table { display: block; max-width: 100%; overflow-x: auto; border-collapse: collapse; font-size: 14px; }
th, td { padding: 10px 12px; border: 1px solid var(--line); vertical-align: top; }

header.site { position: sticky; top: 0; z-index: 100; min-height: 70px; padding: 14px max(24px, calc((100% - var(--container))/2)); display: flex; align-items: center; justify-content: space-between; gap: 30px; border-bottom: 1px solid rgba(255,255,255,.1); color: white; background: rgba(6,17,31,.97); }
header.site .brand { color: white; font-weight: 700; text-decoration: none; }
.topnav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 18px; font-size: 13px; }
.topnav a { color: #c8d2dc; text-decoration: none; }
.topnav a:hover { color: white; }

.layout { width: min(var(--container), calc(100% - 48px)); margin: 0 auto; display: grid; grid-template-columns: 270px minmax(0,1fr); gap: 56px; align-items: start; }
.sidebar { position: sticky; top: 96px; max-height: calc(100vh - 118px); padding: 48px 0; overflow-y: auto; font-size: 13px; }
.sidebar h4 { margin: 22px 0 8px; color: #6a736f; font: 500 11px "IBM Plex Mono", monospace; letter-spacing: .08em; text-transform: uppercase; }
.sidebar ul { margin: 0; padding: 0; list-style: none; }
.sidebar li { margin: 5px 0; }
.sidebar a { display: block; padding: 5px 8px; border-left: 2px solid transparent; color: var(--muted); text-decoration: none; }
.sidebar a:hover, .sidebar a.active { border-color: var(--copper); color: var(--ink); }

.content { min-width: 0; max-width: 900px !important; padding: 70px 0 100px; }
.content > .hero { margin: -70px 0 64px; padding: 72px 0 64px; }
.kicker, .meta { color: #6a736f; font: 500 11px "IBM Plex Mono", monospace; letter-spacing: .08em; text-transform: uppercase; }
.title, .content h1, .content h2 { font-family: "Noto Serif Thai", Georgia, serif; letter-spacing: -.025em; }
.title { margin: 0 0 24px; font-size: clamp(40px,6vw,67px); line-height: 1.1; }
.content h1:not(.title) { margin: 70px 0 20px; font-size: 38px; line-height: 1.2; }
.content h2 { margin: 54px 0 18px; font-size: 30px; line-height: 1.25; }
.content h3 { margin: 38px 0 14px; font-size: 21px; }
.content p { max-width: 76ch; }
.content li { margin: 7px 0; }
.notice { margin: 30px 0; padding: 22px 24px; border-left: 4px solid var(--copper); background: var(--paper-deep); }

.card-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 1px; margin: 28px 0 64px; padding: 1px; background: var(--line); }
.card { min-height: 210px; padding: 28px; color: var(--ink); background: var(--white); text-decoration: none; transition: background .18s ease, transform .18s ease; }
.card:hover { position: relative; z-index: 1; background: #faf5eb; transform: translateY(-2px); }
.card .k { color: #727c78; font: 500 11px "IBM Plex Mono", monospace; letter-spacing: .06em; text-transform: uppercase; }
.card h3 { margin: 44px 0 8px; font: 600 20px/1.35 "Noto Serif Thai", Georgia, serif; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.pager { display: flex; justify-content: space-between; gap: 24px; margin-top: 70px; padding-top: 24px; border-top: 1px solid var(--line); }

footer.site { padding: 28px 24px; border-top: 1px solid rgba(255,255,255,.1); color: #9eabb7; background: var(--navy); text-align: center; font-size: 12px; }

@media (max-width: 900px) {
  header.site { position: relative; align-items: flex-start; flex-direction: column; gap: 10px; }
  .topnav { justify-content: flex-start; }
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; max-height: none; padding: 26px 0 0; columns: 2; }
  .sidebar h4 { break-after: avoid; }
  .sidebar ul { break-inside: avoid; margin-bottom: 18px; }
  .content { padding-top: 40px; }
  .content > .hero { margin-top: -40px; }
}

@media (max-width: 620px) {
  header.site { padding: 16px 14px; }
  .topnav { gap: 10px 15px; }
  .layout { width: min(100% - 28px, var(--container)); }
  .sidebar { columns: 1; }
  .card-grid { grid-template-columns: 1fr; }
  .title { font-size: 40px; }
  .content h1:not(.title) { font-size: 32px; }
  .content h2 { font-size: 26px; }
  .pager { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}


/* Shared COIN identity across the archived thesis pages. */
body::before{content:"";position:fixed;z-index:1000;top:10px;right:14px;width:86px;height:30px;border:1px solid #ded7ca;border-radius:999px;background:#fff url('../coin-logo.jpeg') center/72px auto no-repeat;box-shadow:0 4px 15px rgba(23,34,29,.08);pointer-events:none}