:root {
  --navy: #0f2f58;
  --blue: #1f5d9f;
  --ice: #eef5ff;
  --ink: #17345d;
  --line: #d8e6f8;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', 'Noto Sans TC', 'Segoe UI', Arial, sans-serif;
  color: var(--ink);
  background: #f7faff;
}

a { color: #1d5fa8; text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; }
.section { padding: 4rem 0; }
.light { background: var(--ice); }
.section h2 { margin: 0 0 1rem; color: #103f74; }
.section-head p { margin: 0; color: #3a5f8c; line-height: 1.7; max-width: 82ch; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.topbar-inner {
  min-height: 68px;
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 1rem;
}
.brand { color: #123f74; font-weight: 700; }
.nav { display: flex; gap: 1rem; justify-content: center; }
.menu-btn { display: none; }
.lang-toggle { border: 1px solid #bdd3ed; border-radius: 999px; overflow: hidden; }
.lang-toggle button {
  border: 0;
  background: #f0f6ff;
  color: #1d4f86;
  padding: .35rem .75rem;
  cursor: pointer;
}
.lang-toggle .active { background: #1d4f86; color: #fff; }

.hero {
  position: relative;
  min-height: 76vh;
  display: flex;
  align-items: center;
  background: radial-gradient(circle at 15% 20%, rgba(105, 170, 228, .35), transparent 42%),
    linear-gradient(130deg, #0e2f58 0%, #15497a 48%, #256ca2 100%);
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(130deg, rgba(10,34,67,.62), rgba(20,74,124,.45));
}
.hero-content { position: relative; color: #f1f7ff; padding: 4.8rem 0; }
.eyebrow { font-weight: 600; }
.hero h1 { margin: .4rem 0 1rem; font-size: clamp(1.8rem, 4.2vw, 3rem); max-width: 20ch; }
.subtitle { max-width: 70ch; line-height: 1.7; }
.statement { font-weight: 600; margin-top: 1rem; }
.cta-row { margin-top: 1.4rem; display: flex; flex-wrap: wrap; gap: .7rem; }
.btn {
  border: 1px solid rgba(220,235,255,.65);
  background: rgba(255,255,255,.12);
  color: #f3f8ff;
  padding: .62rem 1rem;
  border-radius: 10px;
}

.grid { display: grid; gap: 1rem; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
  box-shadow: 0 8px 20px rgba(20,62,110,.06);
}
.card h4, .card h3 { margin: .1rem 0 .6rem; color: #113f74; }

.showcase-note { font-weight: 600; color: #1a4f87; }
.tabs { display: flex; flex-wrap: wrap; gap: .7rem; margin: 1rem 0; }
.tabs button {
  border: 1px solid #c0d5ef;
  border-radius: 999px;
  background: #fff;
  color: #1b4f86;
  padding: .45rem .95rem;
  font-weight: 600;
  cursor: pointer;
}
.tabs button.active { background: var(--blue); border-color: var(--blue); color: #fff; }

.modules-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: 1fr 1.15fr 1.35fr;
  gap: 1rem;
  align-items: start;
}
.sample-buttons { display: grid; gap: .55rem; }
.sample-btn {
  text-align: left;
  border: 1px solid #d2e2f6;
  background: #f8fbff;
  border-radius: 12px;
  padding: .68rem;
  cursor: pointer;
  display: grid;
  gap: .25rem;
}
.sample-btn strong { color: #123f73; }
.sample-btn span { color: #436893; font-size: .92rem; }
.sample-btn.active { border-color: #4f83bf; box-shadow: inset 0 0 0 1px #4f83bf; background: #eaf3ff; }

.pipeline-steps { display: grid; gap: .55rem; }
.pipe-step {
  background: #fbfdff;
  border: 1px solid #d8e6f8;
  border-radius: 10px;
  padding: .62rem;
}
.pipe-step b { display: block; color: #123f74; margin-bottom: .2rem; }
.pipe-step p { margin: 0; color: #3b628f; font-size: .92rem; }

.result-block { border-top: 1px solid #e1ecfa; padding-top: .7rem; margin-top: .7rem; }
.result-block:first-child { border-top: 0; margin-top: 0; padding-top: 0; }
.result-block h4 { margin: 0 0 .45rem; color: #133f73; }
.result-block ul { margin: 0; padding-left: 1.1rem; color: #345a87; }
.result-block p { margin: 0; color: #345a87; }
.dl { display: grid; gap: .35rem; }
.dl div { display: grid; grid-template-columns: 140px 1fr; gap: .4rem; }
.dl b { color: #365a83; }
.scbkr-tags { display: flex; flex-wrap: wrap; gap: .35rem; }
.tag { border: 1px solid #c6dbf3; background: #f3f8ff; border-radius: 999px; padding: .2rem .56rem; font-size: .83rem; color: #1e4f86; }
.gate { font-weight: 700; border-radius: 999px; padding: .22rem .75rem; border: 1px solid transparent; }
.gate-ALLOW { color: #0f6a45; background: #e6f7ef; border-color: #95dfbc; }
.gate-WARN { color: #9a6400; background: #fff4df; border-color: #ffd58a; }
.gate-BLOCK { color: #982d37; background: #fdecef; border-color: #f5a9b1; }

.boundary-card p { line-height: 1.7; color: #3a608d; }

.layer-flow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .7rem; }
.layer { text-align: center; border: 1px solid #cfdef3; border-radius: 12px; padding: .8rem; font-weight: 600; background: #f6faff; color: #1b4f85; }

.author-card p { margin: .28rem 0; color: #355b89; }

.footer { background: #0e2d55; color: #deebff; padding: 2.3rem 0; }
.footer a { color: #deebff; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1.1fr; gap: 1rem; }
.footer ul { margin: 0; padding-left: 1.1rem; }
.footer small { opacity: .95; }

@media (max-width: 1100px) {
  .modules-grid { grid-template-columns: 1fr 1fr; }
  .modules-grid > section:last-child { grid-column: 1 / -1; }
  .grid.four, .layer-flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .topbar-inner { grid-template-columns: auto auto 1fr auto; }
  .menu-btn {
    display: inline-block;
    border: 1px solid #bdd3ed;
    border-radius: 8px;
    background: #f3f8ff;
    color: #1b4f84;
    padding: .3rem .55rem;
  }
  .nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid #d9e6f8;
    flex-direction: column;
    gap: 0;
  }
  .nav.open { display: flex; }
  .nav a { padding: .8rem 1rem; border-top: 1px solid #ecf3fc; }
  .modules-grid, .grid.two, .grid.three, .grid.four, .layer-flow, .footer-grid { grid-template-columns: 1fr; }
  .dl div { grid-template-columns: 1fr; }
  .hero { min-height: 82vh; background: radial-gradient(circle at 50% 15%, rgba(129,190,242,.35), transparent 38%), linear-gradient(160deg, #0d2a4f 0%, #194a78 48%, #2a77a8 100%); }
}