:root {
  color-scheme: light;
  --bg-1: #fff6ea;
  --bg-2: #f2ebdf;
  --card: rgba(255, 252, 246, 0.82);
  --card-strong: rgba(255, 255, 255, 0.92);
  --ink-950: #182126;
  --ink-850: #2e3c43;
  --ink-700: #5a6a72;
  --ink-500: #87939a;
  --line: rgba(25, 84, 94, 0.12);
  --lagoon: #1e6972;
  --lagoon-deep: #0f4b54;
  --coral: #d96e52;
  --gold: #b88a2e;
  --shadow: 0 28px 66px rgba(42, 52, 60, 0.14);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Gill Sans", "Segoe UI", sans-serif;
  color: var(--ink-950);
  background:
    radial-gradient(circle at top left, rgba(217, 110, 82, 0.18), transparent 24%),
    radial-gradient(circle at top right, rgba(30, 105, 114, 0.16), transparent 26%),
    linear-gradient(180deg, var(--bg-1) 0%, var(--bg-2) 58%, #f6f3ee 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.32) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.22) 1px, transparent 1px);
  background-size: 120px 120px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.24), transparent 84%);
}

a {
  color: inherit;
}

h1,
h2,
h3 {
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  letter-spacing: -0.03em;
}

.viewer-shell {
  width: min(calc(100% - 28px), 1460px);
  margin: 18px auto 42px;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 18px;
}

.viewer-sidebar {
  position: sticky;
  top: 18px;
  align-self: start;
  display: grid;
  gap: 18px;
  padding: 24px;
  border-radius: var(--radius-xl);
  background:
    linear-gradient(160deg, rgba(255, 252, 246, 0.92), rgba(248, 241, 231, 0.92));
  border: 1px solid rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.viewer-brand {
  display: inline-grid;
  gap: 8px;
  text-decoration: none;
}

.viewer-brand strong {
  font-size: 1.2rem;
}

.viewer-brand span {
  color: var(--ink-700);
  line-height: 1.65;
}

.viewer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.viewer-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 11px 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  background: linear-gradient(135deg, var(--lagoon), var(--coral));
  color: white;
  box-shadow: 0 18px 36px rgba(30, 105, 114, 0.18);
}

.viewer-pill.secondary {
  background: rgba(255, 255, 255, 0.76);
  color: var(--ink-950);
  border-color: var(--line);
  box-shadow: none;
}

.viewer-sidebar-block {
  display: grid;
  gap: 12px;
}

.viewer-sidebar-label,
.viewer-eyebrow {
  margin: 0;
  color: var(--ink-500);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.viewer-sidebar-list {
  display: grid;
  gap: 8px;
}

.viewer-sidebar-link {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border-radius: 18px;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.52);
  border: 1px solid transparent;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.viewer-sidebar-link:hover {
  transform: translateY(-1px);
  border-color: var(--line);
}

.viewer-sidebar-link.is-active {
  background: linear-gradient(135deg, rgba(30, 105, 114, 0.12), rgba(217, 110, 82, 0.12));
  border-color: rgba(30, 105, 114, 0.18);
}

.viewer-sidebar-link strong {
  font-size: 0.98rem;
}

.viewer-sidebar-link span {
  color: var(--ink-700);
  font-size: 0.9rem;
}

.viewer-main {
  display: grid;
  gap: 18px;
}

.viewer-hero,
.viewer-frame-card,
.viewer-nav-card {
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at top right, rgba(30, 105, 114, 0.12), transparent 28%),
    radial-gradient(circle at bottom left, rgba(217, 110, 82, 0.12), transparent 30%),
    linear-gradient(140deg, rgba(255, 252, 246, 0.94), rgba(248, 242, 232, 0.94));
  border: 1px solid rgba(255, 255, 255, 0.84);
  box-shadow: var(--shadow);
}

.viewer-hero {
  padding: 34px;
}

.viewer-hero h1 {
  margin: 10px 0 14px;
  font-size: clamp(2.7rem, 4vw, 4.9rem);
  line-height: 0.96;
}

.viewer-lede {
  margin: 0;
  max-width: 68ch;
  color: var(--ink-700);
  line-height: 1.8;
  font-size: 1.04rem;
}

.viewer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 0;
}

.viewer-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  color: var(--ink-850);
  font-weight: 700;
}

.viewer-frame-card {
  overflow: hidden;
}

.viewer-frame-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border-bottom: 1px solid rgba(30, 105, 114, 0.08);
  background: rgba(255, 255, 255, 0.68);
}

.viewer-frame-top-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.viewer-dots {
  display: flex;
  gap: 6px;
}

.viewer-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(30, 105, 114, 0.18);
}

.viewer-dots span:nth-child(1) {
  background: rgba(217, 110, 82, 0.72);
}

.viewer-dots span:nth-child(2) {
  background: rgba(184, 138, 46, 0.76);
}

.viewer-dots span:nth-child(3) {
  background: rgba(30, 105, 114, 0.78);
}

.viewer-frame-caption {
  min-width: 0;
}

.viewer-frame-caption strong,
.viewer-frame-caption span {
  display: block;
}

.viewer-frame-caption span {
  color: var(--ink-700);
  font-size: 0.92rem;
}

.viewer-frame-link {
  color: var(--lagoon-deep);
  text-decoration: none;
  font-weight: 700;
}

.viewer-frame-wrap {
  padding: 18px;
}

.viewer-frame-shell {
  overflow: hidden;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.82);
  box-shadow: inset 0 0 0 1px rgba(30, 105, 114, 0.05);
}

.viewer-frame-shell iframe {
  display: block;
  width: 100%;
  min-height: 1200px;
  border: 0;
  background: white;
}

.viewer-nav-card {
  padding: 18px;
}

.viewer-nav-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.viewer-nav-link {
  display: grid;
  gap: 8px;
  padding: 18px;
  border-radius: 22px;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.84);
}

.viewer-nav-link.is-empty {
  opacity: 0.45;
  pointer-events: none;
}

.viewer-nav-link span {
  color: var(--ink-500);
  font-size: 0.84rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.viewer-nav-link strong {
  font-size: 1.08rem;
}

@media (max-width: 1120px) {
  .viewer-shell {
    grid-template-columns: 1fr;
  }

  .viewer-sidebar {
    position: static;
  }

  .viewer-sidebar-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .viewer-shell {
    width: min(calc(100% - 16px), 1460px);
  }

  .viewer-sidebar,
  .viewer-hero,
  .viewer-nav-card {
    padding: 20px;
  }

  .viewer-frame-top,
  .viewer-frame-wrap {
    padding: 14px;
  }

  .viewer-frame-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .viewer-sidebar-list,
  .viewer-nav-grid {
    grid-template-columns: 1fr;
  }

  .viewer-frame-shell iframe {
    min-height: 900px;
  }
}