/* ==========================================================================
   Research-paper theme layer
   Loaded after the base styles. Mutes the startup-deck palette into a
   restrained academic style: warm paper, ink, one navy accent, serif heads,
   flat surfaces, square corners.
   ========================================================================== */

:root {
  --font-display: "Source Serif 4", "Iowan Old Style", "Palatino Linotype",
    Palatino, Georgia, "Times New Roman", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;

  --accent: #1f3a5f;
  --accent-strong: #14273f;
  --accent-soft: rgba(31, 58, 95, 0.06);
  --accent-ring: rgba(31, 58, 95, 0.22);
  --accent-2: #5b6b7c;
  --accent-2-soft: rgba(91, 107, 124, 0.09);
  --accent-3: #8a6d3b;

  --gradient: var(--accent);
  --gradient-soft: rgba(31, 58, 95, 0.06);

  --bg: #fcfbf8;
  --bg-soft: #f6f4ef;
  --bg-deep: #eeece6;
  --bg-elev: #ffffff;
  --bg-glass: rgba(252, 251, 248, 0.96);
  --bg-code: #1c1f24;

  --ink: #1b1b1a;
  --ink-soft: #33322f;
  --muted: #5d5b56;
  --muted-2: #77746d;

  --border: #ddd9d0;
  --border-strong: #c7c2b6;

  --good: #2f6b4f;
  --good-bg: rgba(47, 107, 79, 0.08);
  --warn: #8a6a1f;
  --warn-bg: rgba(138, 106, 31, 0.09);
  --bad: #9b2c2c;
  --bad-bg: rgba(155, 44, 44, 0.08);

  --radius-xs: 2px;
  --radius-sm: 3px;
  --radius: 5px;
  --radius-lg: 6px;
  --radius-full: 999px;

  --shadow-xs: 0 1px 1px rgba(20, 20, 18, 0.03);
  --shadow-sm: 0 1px 2px rgba(20, 20, 18, 0.04);
  --shadow-md: 0 2px 6px rgba(20, 20, 18, 0.05);
  --shadow-lg: 0 3px 10px rgba(20, 20, 18, 0.06);
  --shadow-glow: 0 0 0 transparent;
}

[data-theme="dark"] {
  --accent: #9db8d6;
  --accent-strong: #c3d6ea;
  --accent-soft: rgba(157, 184, 214, 0.09);
  --accent-ring: rgba(157, 184, 214, 0.22);
  --accent-2: #a8a396;
  --accent-2-soft: rgba(168, 163, 150, 0.1);
  --accent-3: #c2a878;

  --bg: #141413;
  --bg-soft: #1a1a19;
  --bg-deep: #222221;
  --bg-elev: #1b1b1a;
  --bg-glass: rgba(20, 20, 19, 0.96);
  --bg-code: #0f0f0e;

  --ink: #e9e7e1;
  --ink-soft: #d2cfc8;
  --muted: #a5a29a;
  --muted-2: #8b8880;

  --border: #30302e;
  --border-strong: #424240;

  --good: #86b39a;
  --good-bg: rgba(134, 179, 154, 0.1);
  --warn: #c9ab72;
  --warn-bg: rgba(201, 171, 114, 0.1);
  --bad: #cf9191;
  --bad-bg: rgba(207, 145, 145, 0.1);
}

/* Typography ------------------------------------------------------------- */

h1,
h2,
h3,
h4,
h5,
h6,
.hero h1,
.section-title,
.snapshot-title,
.family-toolbar-title,
.podium-model,
.model-name,
.brand {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.005em;
}

.hero h1 {
  letter-spacing: -0.01em;
}

.text-gradient,
.finding-value.text-gradient {
  background: none !important;
  -webkit-text-fill-color: currentColor;
  background-clip: border-box;
  color: var(--accent);
}

/* Flat page grounds ------------------------------------------------------ */

body {
  background: var(--bg);
}

.site-header {
  background: var(--bg-glass);
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

.scroll-progress {
  height: 2px;
  background: var(--accent);
  box-shadow: none;
}

.hero::before,
.hero::after,
.page-hero::after,
.viz-hero::after,
.snapshot::before,
.citation-card::before,
.feature-card::after {
  display: none !important;
}

.page-hero,
.viz-page {
  background: var(--bg);
}

.snapshot {
  box-shadow: var(--shadow-sm);
}

/* Controls --------------------------------------------------------------- */

.btn {
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.btn-primary,
.btn-gradient {
  background: var(--accent) !important;
  border: 1px solid var(--accent);
  box-shadow: none !important;
  color: #ffffff;
}

.btn-primary:hover,
.btn-gradient:hover {
  background: var(--accent-strong) !important;
  border-color: var(--accent-strong);
  filter: none;
  transform: none;
}

.btn-ghost,
.btn-soft {
  border-radius: var(--radius-sm);
}

.brand-mark {
  background: var(--accent) !important;
  border-radius: var(--radius-sm);
  box-shadow: none;
}

.hero-badge,
.badge,
.snapshot-live {
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--muted);
  box-shadow: none;
}

.hero-badge {
  background: var(--accent-soft);
  border-color: transparent;
  color: var(--accent);
}

.snapshot-live::before {
  animation: none;
  opacity: 0.7;
}

/* Data marks ------------------------------------------------------------- */

.metric-fill,
.metric-fill.is-alt,
.metric-fill.is-warm,
.bar-fill {
  background: var(--accent) !important;
}

.metric-fill.is-alt {
  background: var(--accent-2) !important;
}

.metric-fill.is-warm {
  background: var(--accent-3) !important;
}

.rank-medal,
.top-model .top-rank,
.showcase-table thead th .rank-medal,
.top-model:nth-child(2) .top-rank,
.top-model:nth-child(3) .top-rank,
.top-model:nth-child(4) .top-rank {
  background: var(--bg-deep) !important;
  color: var(--ink-soft) !important;
  border: 1px solid var(--border);
  box-shadow: none;
}

.phase-card:nth-child(1) {
  --phase-color: #1f3a5f;
}

.phase-card:nth-child(2) {
  --phase-color: #4a5d73;
}

.phase-card:nth-child(3) {
  --phase-color: #8a6d3b;
}

.phase-card:nth-child(4) {
  --phase-color: #55603f;
}

.family-chip[data-phase="1"] {
  --chip-color: #1f3a5f;
}

.family-chip[data-phase="2"] {
  --chip-color: #4a5d73;
}

.family-chip[data-phase="3"] {
  --chip-color: #8a6d3b;
}

.family-chip[data-phase="4"] {
  --chip-color: #55603f;
}

.podium-card[data-rank="1"] {
  --podium-color: #1f3a5f;
  border-color: var(--border);
  background: var(--bg-elev);
}

.podium-card[data-rank="2"] {
  --podium-color: #5b6b7c;
}

.podium-card[data-rank="3"] {
  --podium-color: #8a6d3b;
}

.podium-card[data-rank="1"] .podium-rank {
  background: var(--bg-soft);
  color: var(--accent);
}

[data-theme="dark"] .podium-card[data-rank="1"] .podium-rank {
  color: var(--accent);
}

.feature-icon,
.feature-icon.is-teal,
.feature-icon.is-amber {
  background: var(--accent-soft) !important;
  color: var(--accent) !important;
}

/* Cards: flat, square, no lift ------------------------------------------- */

.card,
.feature-card,
.phase-card,
.finding-card,
.family-explorer,
.snapshot,
.scoreboard-card,
.podium-card,
.citation-card,
.showcase-shell,
.family-explorer {
  border-radius: var(--radius);
  box-shadow: none;
}

.phase-card:hover,
.feature-card:hover,
.card-hover:hover,
.family-chip:hover {
  transform: none;
  box-shadow: none;
}

.citation-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--ink-soft);
}

.citation-head h3 {
  color: var(--ink);
}

.citation-card pre {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--ink-soft);
}

/* Section labels: smaller caps, less tracking ---------------------------- */

.phase-label,
.hero-badge,
.snapshot-top-title,
.section-kicker {
  letter-spacing: 0.08em;
}


/* Density and navigation refinements ------------------------------------- */

.hero {
  padding: calc(var(--nav-h) + 56px) 0 64px;
}

.hero h1 {
  font-size: clamp(2.2rem, 4vw, 3.25rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
}

.hero-grid {
  gap: 48px;
}

.nav-link {
  border-radius: 0;
  padding: 8px 2px;
  margin: 0 10px;
}

.nav-link:hover {
  background: transparent;
}

.nav-link.is-active {
  background: transparent;
  box-shadow: inset 0 -2px 0 var(--accent);
}

.model-chip {
  border-radius: var(--radius-sm);
}

.model-chip.is-active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: none;
}

.model-chip.is-active .provider-dot {
  box-shadow: none;
}

.provider-dot,
.model-chip .chip-dot,
.family-dot {
  filter: saturate(0.55) brightness(0.92);
}

.kpi,
.summary-card,
.podium-card {
  box-shadow: none;
}