:root {
  --bg: #eef3f9;
  --panel: rgba(255, 255, 255, 0.9);
  --panel-strong: #ffffff;
  --text: #123055;
  --muted: #4e6888;
  --line: rgba(18, 48, 85, 0.12);
  --primary: #0d5bd7;
  --primary-deep: #0a387f;
  --accent: #c49b44;
  --allow: #1f8b4d;
  --warn: #d88419;
  --void: #cf4040;
  --shadow: 0 22px 55px rgba(13, 38, 76, 0.1);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --max-width: 1220px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', 'Noto Sans TC', sans-serif;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(13, 91, 215, 0.05), rgba(255, 255, 255, 0.9) 18%),
    repeating-linear-gradient(90deg, rgba(13, 91, 215, 0.04) 0, rgba(13, 91, 215, 0.04) 1px, transparent 1px, transparent 90px),
    var(--bg);
}

a { color: var(--primary-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-shell { padding: 24px; }
.panel {
  width: min(100%, var(--max-width));
  margin: 0 auto 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 24px;
  backdrop-filter: blur(18px);
}
.brand { display: grid; font-weight: 800; line-height: 1.15; }
.brand span:last-child { font-size: 0.86rem; color: var(--muted); }
.topnav { display: flex; flex-wrap: wrap; gap: 18px; }
.topnav a { font-size: 0.95rem; font-weight: 600; }

.hero {
  position: relative;
  min-height: 80vh;
  display: grid;
  align-items: center;
  background: linear-gradient(130deg, rgba(7, 33, 70, 0.76), rgba(13, 91, 215, 0.42)), url('../../copyright-hero-desktop.jpg') center/cover no-repeat;
  color: #fff;
}
.hero__backdrop {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(7,33,70,0.26));
}
.hero__content {
  position: relative;
  z-index: 1;
  width: min(100%, 760px);
  padding: 64px 40px;
}
.eyebrow {
  margin: 0 0 12px;
  color: inherit;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.82rem;
  opacity: 0.82;
}
.hero h1, .section h2 { margin: 0; line-height: 1.05; }
.hero h1 { font-size: clamp(2.8rem, 6vw, 5.5rem); }
.hero h1 span, .section h2 span { display: block; font-size: 0.48em; opacity: 0.88; margin-top: 10px; }
.hero__lead {
  margin: 22px 0 30px;
  max-width: 640px;
  color: rgba(255,255,255,0.93);
  font-size: clamp(1.08rem, 2vw, 1.28rem);
  line-height: 1.7;
}
.hero__actions, .control-group--actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  appearance: none;
  border: none;
  border-radius: 999px;
  padding: 14px 20px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.button:hover { transform: translateY(-1px); }
.button--primary { background: var(--primary); color: #fff; box-shadow: 0 12px 24px rgba(13, 91, 215, 0.25); }
.button--secondary { background: rgba(255,255,255,0.15); color: #fff; border: 1px solid rgba(255,255,255,0.28); }
.button--accent { background: var(--accent); color: #132642; }
.button--ghost { background: transparent; border: 1px solid var(--line); color: var(--text); }
.owner-card {
  margin-top: 24px;
  display: inline-grid;
  gap: 6px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: rgba(196, 155, 68, 0.15);
  border: 1px solid rgba(196, 155, 68, 0.4);
}
.owner-card p { margin: 0; }

.section { padding: 36px 30px 34px; }
.section-heading { margin-bottom: 24px; }
.section h2 { font-size: clamp(2rem, 4vw, 3.4rem); }
.overview-grid, .explanation-grid, .model-grid, .state-grid, .licensing-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 18px;
}
.info-card, .model-card, .state-card, .detail-panel, .controls-card, .result-card, .auto-demo-card {
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}
.info-card, .model-card, .state-card { padding: 22px; }
.overview-grid > *, .explanation-grid > *, .licensing-grid > * { grid-column: span 4; }
.model-grid > * { grid-column: span 6; }
.state-grid > * { grid-column: span 4; }
.demo-layout { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 18px; align-items: start; }
.controls-card, .result-card, .auto-demo-card { padding: 22px; }
.control-group + .control-group { margin-top: 18px; }
.chip-group { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  border: 1px solid var(--line);
  background: #f7faff;
  color: var(--text);
  padding: 12px 14px;
  border-radius: 16px;
  min-width: 190px;
  text-align: left;
  transition: all 0.25s ease;
}
.chip.is-active {
  background: rgba(13, 91, 215, 0.1);
  border-color: rgba(13, 91, 215, 0.35);
  box-shadow: inset 0 0 0 1px rgba(13, 91, 215, 0.2);
}
.chip strong, .chip span { display: block; }
.chip span { font-size: 0.85rem; color: var(--muted); margin-top: 4px; }
.selection-summary {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  color: var(--muted);
}
.selection-summary p { margin: 8px 0; }
.result-card { position: relative; }
.result-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
.result-card__headline { margin-bottom: 20px; }
.decision-state {
  font-size: clamp(3rem, 7vw, 5.3rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: 0.03em;
  margin: 12px 0 14px;
  transition: color 0.25s ease, transform 0.3s ease, opacity 0.25s ease;
}
.decision-state.is-animating { opacity: 0.45; transform: translateY(4px); }
.decision-state--idle { color: var(--primary-deep); }
.decision-state--allow { color: var(--allow); }
.decision-state--warn, .state-card--warn h3 { color: var(--warn); }
.decision-state--non-closable { color: var(--warn); }
.decision-state--void, .decision-state--overrun, .state-card--void h3 { color: var(--void); }
.decision-summary { margin: 0; color: var(--muted); line-height: 1.6; }
.result-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.detail-panel { padding: 18px; }
.detail-panel--hash { grid-column: 1 / -1; background: linear-gradient(180deg, rgba(196,155,68,0.08), rgba(255,255,255,1)); }
.metric-list { display: grid; gap: 10px; margin: 0; }
.metric-list div { display: grid; gap: 4px; padding-bottom: 10px; border-bottom: 1px dashed var(--line); }
.metric-list dt { font-weight: 700; }
.metric-list dd { margin: 0; color: var(--muted); }
.detail-copy p { margin: 0 0 10px; line-height: 1.65; }
.detail-list { margin: 0; padding-left: 18px; color: var(--muted); display: grid; gap: 8px; }
.hash-display {
  display: block;
  background: #10213c;
  color: #d8e7ff;
  border-radius: 14px;
  padding: 16px;
  min-height: 74px;
  word-break: break-all;
  font-size: 0.95rem;
  box-shadow: inset 0 0 0 1px rgba(216, 231, 255, 0.08);
}
.hash-display.is-generating { animation: pulse 0.7s linear infinite; }
.timestamp { margin-top: 12px; color: var(--muted); }
.licensing-callout {
  margin-top: 18px;
  padding: 18px;
  border-radius: 16px;
  background: rgba(13, 91, 215, 0.05);
  border: 1px solid rgba(13, 91, 215, 0.14);
}
.licensing-callout p { margin: 6px 0; }
.timeline { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 12px; }
.timeline li {
  position: relative;
  padding: 16px 18px 16px 54px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}
.timeline li::before {
  content: attr(data-step);
  position: absolute;
  left: 16px; top: 15px;
  width: 24px; height: 24px;
  border-radius: 50%;
  display: grid; place-items: center;
  background: rgba(13, 91, 215, 0.12);
  color: var(--primary-deep);
  font-size: 0.85rem; font-weight: 800;
}
.timeline li.is-active {
  background: rgba(13, 91, 215, 0.08);
  border-color: rgba(13, 91, 215, 0.28);
  transform: translateX(4px);
  color: var(--text);
}
.timeline li.is-complete { border-color: rgba(31, 139, 77, 0.25); }
.state-card { border-top: 4px solid transparent; }
.state-card--allow { border-top-color: var(--allow); }
.state-card--warn { border-top-color: var(--warn); }
.state-card--void { border-top-color: var(--void); }
.footer {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  padding: 24px;
}
.footer p { margin: 0 0 8px; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@keyframes pulse {
  0% { box-shadow: inset 0 0 0 1px rgba(216, 231, 255, 0.08), 0 0 0 rgba(13, 91, 215, 0.1); }
  50% { box-shadow: inset 0 0 0 1px rgba(216, 231, 255, 0.12), 0 0 0 6px rgba(13, 91, 215, 0.08); }
  100% { box-shadow: inset 0 0 0 1px rgba(216, 231, 255, 0.08), 0 0 0 rgba(13, 91, 215, 0.1); }
}

@media (max-width: 960px) {
  .site-shell { padding: 16px; }
  .topbar, .demo-layout, .footer { grid-template-columns: 1fr; display: grid; }
  .topbar { position: static; }
  .overview-grid > *, .explanation-grid > *, .licensing-grid > *, .model-grid > *, .state-grid > * { grid-column: span 12; }
  .result-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .hero {
    min-height: 88vh;
    background: linear-gradient(150deg, rgba(7, 33, 70, 0.68), rgba(13, 91, 215, 0.36)), url('../../copyright-hero-mobile.jpg') center/cover no-repeat;
  }
  .hero__content, .section, .footer { padding: 24px 18px; }
  .topbar { padding: 16px 18px; }
  .decision-state { font-size: clamp(2.5rem, 12vw, 4rem); }
  .chip { min-width: 100%; }
}