@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Source+Serif+4:opsz,wght@8..60,600;8..60,700&display=swap');

:root {
  color-scheme: light;
  --ink: #17202f;
  --muted: #687284;
  --paper: #ffffff;
  --canvas: #f4f7fa;
  --line: #dce3e9;
  --navy: #112a46;
  --blue: #176b87;
  --blue-soft: #e9f4f6;
  --gold: #c7922f;
  --gold-soft: #fff7e5;
  --shadow: 0 16px 42px rgba(25, 45, 66, 0.08);
  font-family: "DM Sans", Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body { margin: 0; background: var(--canvas); color: var(--ink); }

a { color: var(--blue); }

.skip-link {
  position: fixed; z-index: 20; top: 12px; left: 12px;
  padding: 9px 14px; border-radius: 6px; background: var(--paper);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

/* Hero */
.hero {
  position: relative; overflow: hidden;
  padding: 84px 24px 70px; color: #f8fbff;
  background:
    radial-gradient(circle at 88% 14%, rgba(48, 164, 174, 0.34), transparent 31%),
    radial-gradient(circle at 8% 92%, rgba(199, 146, 47, 0.18), transparent 26%),
    linear-gradient(132deg, #0b1c31, #123d59 70%, #145c70);
}
.hero::after {
  content: ""; position: absolute; right: -70px; bottom: -150px;
  width: 430px; height: 430px;
  border: 1px solid rgba(255, 255, 255, 0.12); border-radius: 50%;
  box-shadow: 0 0 0 54px rgba(255, 255, 255, 0.025), 0 0 0 108px rgba(255, 255, 255, 0.018);
}
.hero__inner, main, footer p { width: min(100%, 1440px); margin-inline: auto; }
.hero__inner { position: relative; z-index: 1; }

.eyebrow, .section-number, .figure-label {
  margin: 0 0 10px; color: #80d2d7;
  font-size: 0.76rem; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase;
}
h1, h2 {
  font-family: "Source Serif 4", Georgia, serif;
  line-height: 1.12; letter-spacing: -0.025em;
}
h1 { max-width: 920px; margin: 0; font-size: clamp(2.5rem, 6vw, 5.25rem); }
.hero__summary { max-width: 850px; margin: 24px 0 0; color: #d9e7ef; font-size: clamp(1rem, 1.5vw, 1.16rem); }
.facts {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: 920px; margin: 42px 0 0; border-top: 1px solid rgba(255, 255, 255, 0.19);
}
.facts div { padding: 18px 20px 0 0; }
.facts dt { color: #93b1c1; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.facts dd { margin: 3px 0 0; color: #fff; font-weight: 600; }

/* Main */
main { padding: 54px 24px 80px; }

.intro {
  display: grid; grid-template-columns: 0.8fr 1.2fr;
  gap: 52px; align-items: end; margin-bottom: 28px; padding: 0 4px;
}
.section-number, .figure-label { color: var(--blue); }
.intro h2, .example h2 { margin: 0; font-size: clamp(1.75rem, 3vw, 2.45rem); color: var(--blue); }
.intro > p { max-width: 700px; margin: 0; color: var(--muted); }

/* Example card */
.example {
  margin-top: 28px; padding: 30px;
  border: 1px solid var(--line); border-radius: 18px;
  background: var(--paper); box-shadow: var(--shadow);
}
.example__heading {
  margin-bottom: 26px;
}
.example__heading code {
  max-width: 100%; padding: 7px 11px;
  border: 1px solid var(--line); border-radius: 7px;
  color: #5c6677; background: #f7f9fb; font-size: 0.76rem; overflow-wrap: anywhere;
}
.layout-desc {
  margin: 6px 0 0; color: var(--muted); font-size: 0.82rem; font-style: italic;
}

/* ===== Shared stage grid base ===== */
.stage-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
}
.stage-card {
  position: relative; min-width: 0; padding: 16px 10px 14px;
  text-align: center; background: linear-gradient(180deg, #fff, #fbfcfd);
}
.stage-card + .stage-card { border-left: 1px solid var(--line); }
.stage-card__label {
  margin: 0 0 10px; font-size: 0.95rem; font-weight: 700; color: var(--ink);
}
.stage-card__spec {
  display: block; width: 100%; height: auto;
  margin: 0 0 10px; border-radius: 6px; border: 1px solid var(--line);
}
.stage-card--reference {
  background: linear-gradient(150deg, var(--gold-soft), #fffdf8);
}
.stage-card--reference .stage-card__label { color: #815a10; }
audio { display: block; width: 100%; min-width: 0; height: 38px; }

/* ===== Speaker group (two speaker rows) ===== */
.speaker-group {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.speaker-row {
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
}
.speaker-row__label {
  margin: 0;
  padding: 8px 14px;
  background: #f7f9fb;
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--blue);
}
.speaker-row .stage-grid {
  border: 0;
  border-radius: 0;
}

/* ===== 2×3 grid layout ===== */
.stage-grid--2x3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.stage-grid--2x3 .stage-card__spec {
  height: 90px;
  object-fit: cover;
}

/* ===== Footer ===== */
footer {
  padding: 24px; border-top: 1px solid var(--line);
  color: var(--muted); background: #edf1f4; font-size: 0.78rem;
}
footer p { margin-block: 0; }

/* ===== Responsive ===== */
@media (max-width: 1080px) {
  .stage-grid, .stage-grid--2x3 { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; border: 0; background: var(--line); }
  .stage-card, .stage-card + .stage-card { border: 0; }
}

@media (max-width: 720px) {
  .hero { padding: 62px 20px 54px; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  main { padding: 38px 14px 58px; }
  .intro { grid-template-columns: 1fr; gap: 14px; }
  .example { padding: 20px 14px; border-radius: 13px; }
  .example__heading { align-items: flex-start; flex-direction: column; gap: 12px; }
  .stage-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}