/* Agent Office proposal — DESIGN.md D1-D6. Letterpress-on-parchment,
   ink-only palette, one section per screen, no shadow/gradient/emoji. */
:root {
  --ink: #1B365D;
  --ink-light: #2a4d7f;
  --parchment: #f5f4ed;
  --ivory: #faf9f5;
  --border: #e8e6dc;
  --stone: #7a766b;
  --text: #3d3a32;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--parchment);
  color: var(--text);
  font-family: "Noto Sans JP", sans-serif;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

/* nav */
#nav-bar {
  position: sticky; top: 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 24px;
  background: rgba(245,244,237,0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(4px);
}
#nav-bar .brand { font-weight: 700; color: var(--ink); font-size: 15px; }
#nav-bar .meta { font-size: 12px; color: var(--stone); letter-spacing: 0.08em; }

/* deck / sections */
.section {
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center;
  max-width: 960px; margin: 0 auto; padding: 96px 24px;
  border-bottom: 1px solid var(--border);
}
.section .num {
  font-size: 13px; letter-spacing: 0.3em; color: var(--stone);
  font-variant-numeric: tabular-nums; margin-bottom: 16px;
}
.section h1 { font-size: 44px; font-weight: 700; color: var(--ink); line-height: 1.35; }
.section h2 {
  font-size: 30px; font-weight: 700; color: var(--ink); line-height: 1.4;
  border-left: 6px solid var(--ink); padding-left: 16px;
}
.section .subtitle { font-size: 20px; color: var(--text); margin-top: 20px; }
.section ul { list-style: none; margin-top: 28px; }
.section li {
  position: relative; padding-left: 22px; margin-bottom: 14px; font-size: 17px;
}
.section li::before {
  content: ""; position: absolute; left: 0; top: 14px;
  width: 8px; height: 1px; background: var(--ink);
}

/* kind: cover (centered) */
.section.cover { text-align: center; align-items: center; background: var(--ivory); }
.section.cover .subtitle { font-size: 24px; color: var(--ink-light); }
.section.cover ul { list-style: none; margin-top: 40px; }
.section.cover li { padding-left: 0; text-align: center; color: var(--stone); }
.section.cover li::before { display: none; }

/* kind: cta (centered, ink inverted) */
.section.cta { text-align: center; align-items: center; background: var(--ink); color: #fff; }
.section.cta h2 { color: #fff; border-left: none; padding-left: 0; }
.section.cta li { color: rgba(255,255,255,0.85); }
.section.cta li::before { background: rgba(255,255,255,0.6); }

footer {
  text-align: center; padding: 40px 24px; font-size: 13px; color: var(--stone);
}

@media (max-width: 640px) {
  .section h1 { font-size: 32px; }
  .section h2 { font-size: 24px; }
  .section { padding: 72px 20px; }
}