/* Thohat Ventures — Brand Bible 2026
   Deep Basalt · Eternal Gold · Alabaster · Playfair Display */

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Montserrat:wght@600;700;800&family=Playfair+Display:ital,wght@1,500;1,600&display=swap");

:root {
  /* Brand Bible 2026 Palette */
  --color-gold: #d4af37;
  --color-gold-hover: #c5a028;
  --color-gold-subtle: rgba(212, 175, 55, 0.1);
  --color-basalt: #2c3e50;
  --color-basalt-deep: #1e2b37;
  --color-sunset: #e67e22;
  --color-alabaster: #fdfdfd;
  --color-alabaster-card: #ffffff;
  --color-alabaster-subtle: #f7f5f2;

  /* Warm Architectural Borders & Dividers */
  --border-stone: #e8e3dc;
  --border-stone-light: #f0ece6;

  /* Text Inks */
  --text-primary: #2c3e50;
  --text-secondary: #5a6b7c;
  --text-muted: #8492a0;

  /* Font Families */
  --font-heading: "Montserrat", -apple-system, sans-serif;
  --font-serif: "Playfair Display", Georgia, serif;
  --font-body: "Inter", -apple-system, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, monospace;

  --max: 1180px;
  --radius: 8px;
  --radius-lg: 12px;
  --nav-bg: rgba(253, 253, 253, 0.94);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-primary);
  background: var(--color-alabaster);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
}

h1,
h2,
h3,
.section-title {
  font-family: var(--font-heading);
}

.container {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

/* —— Navigation —— */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(253, 253, 253, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-stone);
  padding: 20px 48px;
  min-height: 96px;
  display: flex;
  align-items: center;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  width: min(100%, var(--max));
  margin-inline: auto;
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  line-height: 0;
}

.nav-logo img {
  height: 68px;
  width: auto;
  max-height: none;
  display: block;
  object-fit: contain;
  object-position: left center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-links a {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--color-gold-hover);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.55rem 1rem;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-basalt);
  background: transparent;
  border: 1.5px solid var(--color-basalt);
  border-radius: 6px;
  transition: background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.nav-cta:hover {
  background: var(--color-basalt);
  color: #fdfdfd;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--border-stone);
  border-radius: 6px;
  background: var(--color-alabaster-card);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--color-basalt);
  position: relative;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: var(--color-basalt);
}

.nav-toggle span::before {
  top: -5px;
}

.nav-toggle span::after {
  top: 5px;
}

/* —— Hero —— */

.hero {
  padding: 0;
  background: var(--color-alabaster);
}

.hero-editorial {
  max-width: 880px;
  margin: 0 auto;
  padding: 72px 0 64px;
}

.hero-eyebrow {
  display: inline-block;
  margin: 0 0 20px;
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #9a6b1f;
}

.hero h1 {
  margin: 0 0 24px;
  font-family: var(--font-heading);
  font-size: clamp(2.25rem, 4.5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--color-basalt);
}

.hero-tagline {
  display: block;
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 500;
  font-style: italic;
  line-height: 1.45;
  color: var(--color-basalt);
}

.hero-lead {
  margin: 0 0 36px;
  max-width: 720px;
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-secondary);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem 1rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 12px 24px;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #fdfdfd;
  background: var(--color-basalt);
  border: 1.5px solid var(--color-basalt);
  border-radius: 6px;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn-primary:hover {
  background: var(--color-basalt-deep);
  border-color: var(--color-basalt-deep);
  color: #fdfdfd;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 12px 24px;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-basalt);
  background: transparent;
  border: 1px solid var(--border-stone);
  border-radius: 6px;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-secondary:hover {
  background: var(--color-gold-subtle);
  border-color: rgba(212, 175, 55, 0.45);
  color: var(--color-basalt);
}

/* —— Rails bar —— */

.rails-bar {
  border-top: 1px solid var(--border-stone);
  border-bottom: 1px solid var(--border-stone);
  background: var(--color-alabaster-subtle);
  padding: 14px 0;
}

.rails-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.45rem 0.55rem;
}

.rail-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border-stone-light);
  border-radius: 4px;
  white-space: nowrap;
}

.rail-sep {
  color: var(--border-stone);
  font-size: 0.7rem;
  user-select: none;
}

/* —— Pillars —— */

.pillars {
  padding: 4.5rem 0;
  background: var(--color-alabaster);
  border-bottom: 1px solid var(--border-stone);
}

.section-kicker {
  margin: 0 0 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.section-title {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-basalt);
}

.section-lead {
  margin: 0 0 2rem;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 500;
  font-style: italic;
  color: var(--text-primary);
}

.pillar-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.pillar-card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: var(--color-alabaster-card);
  border: 1px solid var(--border-stone);
  border-radius: 12px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.pillar-card:hover {
  border-color: rgba(212, 175, 55, 0.55);
  box-shadow: 0 10px 28px rgba(44, 62, 80, 0.06);
}

.pillar-card h3 {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-basalt);
}

.pillar-sub {
  margin: 0 0 1.25rem;
  padding-bottom: 1rem;
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  font-weight: 500;
  font-style: italic;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-stone);
}

.metric-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex: 1;
}

.metric-tile {
  padding: 0.95rem 1rem;
  background: var(--color-alabaster-subtle);
  border: 1px solid var(--border-stone-light);
  border-radius: 8px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.metric-tile:hover {
  border-color: rgba(212, 175, 55, 0.45);
  transform: translateY(-1px);
}

.metric-tile .metric-id {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-heading);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-basalt);
}

.metric-tile p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

.metric-tile code {
  font-size: 0.85em;
  color: var(--color-basalt);
  background: var(--color-gold-subtle);
  padding: 0.05em 0.3em;
  border-radius: 3px;
  border: 1px solid rgba(212, 175, 55, 0.22);
}

.pillar-actions {
  margin-top: auto;
}

/* —— RFC anatomy —— */

.rfc {
  padding: 4.5rem 0;
  background: var(--color-alabaster-subtle);
  border-bottom: 1px solid var(--border-stone);
}

.rfc-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.15fr);
  gap: 2.5rem;
  align-items: start;
}

.rfc h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--color-basalt);
}

.rfc-copy p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.rfc-copy p:last-of-type {
  margin-bottom: 1.35rem;
}

.pem-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-basalt);
  padding: 0.55rem 0.85rem;
  background: var(--color-alabaster-card);
  border: 1px solid var(--border-stone);
  border-radius: 6px;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.pem-link:hover {
  background: var(--color-gold-subtle);
  border-color: var(--color-gold);
}

.ide-card {
  background: var(--color-basalt-deep);
  color: #f7f5f2;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-basalt);
  box-shadow: 0 14px 40px rgba(30, 43, 55, 0.22);
}

.ide-header {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.7rem 1rem;
  background: #16232e;
  border-bottom: 1px solid rgba(212, 175, 55, 0.22);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 550;
  letter-spacing: 0.04em;
  color: #a8b4c0;
}

.ide-header .live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-gold);
  box-shadow: 0 0 0 3px var(--color-gold-subtle);
  flex-shrink: 0;
}

.ide-body {
  margin: 0;
  padding: 1.1rem 1.15rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  overflow-x: auto;
  color: #c5cdd6;
}

.ide-body .key {
  color: var(--color-gold);
}

.ide-body .str {
  color: #8ecae6;
}

.ide-body .num {
  color: var(--color-sunset);
}

/* —— Specs —— */

.specs {
  padding: 4.5rem 0;
  background: var(--color-alabaster);
  border-bottom: 1px solid var(--border-stone);
}

.specs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.spec-card {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 20px;
  background: #ffffff;
  border: 1px solid var(--border-stone);
  border-radius: var(--radius);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.spec-card:hover {
  border-color: rgba(212, 175, 55, 0.55);
  box-shadow: 0 8px 22px rgba(44, 62, 80, 0.05);
}

.spec-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #8c6d1f;
  background: var(--color-gold-subtle);
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: 4px;
}

.badge-zenodo,
.badge-ssrn,
.badge-github {
  color: #8c6d1f;
  background: var(--color-gold-subtle);
  border-color: rgba(212, 175, 55, 0.3);
}

.spec-card h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-basalt);
}

.spec-card p {
  margin: 0;
  flex: 1;
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

.spec-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-basalt);
  word-break: break-all;
  text-decoration: none;
  transition: color 0.15s ease;
}

.spec-link:hover {
  color: var(--color-gold);
}

.spec-links {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

/* —— Footer —— */

.site-footer {
  padding: 2rem 0;
  background: var(--color-alabaster-subtle);
  border-top: 1px solid var(--border-stone);
  color: var(--text-secondary);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.25rem;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.footer-company {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-basalt);
}

.footer-inner a {
  color: var(--text-secondary);
  font-weight: 500;
  text-decoration: none;
}

.footer-inner a:hover {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-center {
  text-align: center;
}

.footer-right {
  text-align: right;
}

/* —— Responsive —— */

@media (max-width: 980px) {
  .pillar-grid,
  .rfc-grid,
  .specs-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 0.55rem;
  }

  .footer-center,
  .footer-right {
    text-align: left;
  }
}

@media (max-width: 760px) {
  .site-nav {
    padding: 16px 20px;
    min-height: 80px;
  }

  .nav-logo img {
    height: 56px;
  }

  .hero-editorial {
    padding: 48px 0 40px;
  }

  .hero h1 {
    font-size: 2.15rem;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-links,
  .nav-cta {
    display: none;
  }

  .site-nav.is-open .nav-panel {
    display: flex;
  }

  .nav-panel {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    gap: 0;
    padding: 0.75rem 1.25rem 1.25rem;
    background: var(--color-alabaster-card);
    border-bottom: 1px solid var(--border-stone);
  }

  .nav-panel .nav-links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    width: 100%;
  }

  .nav-panel .nav-links a {
    display: block;
    width: 100%;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-stone-light);
  }

  .nav-panel .nav-cta {
    display: inline-flex;
    margin-top: 1rem;
  }

  .hero {
    padding: 3rem 0 2.5rem;
  }

  .rail-sep {
    display: none;
  }

  .pillars,
  .rfc,
  .specs {
    padding: 3rem 0;
  }
}

@media (min-width: 761px) {
  .nav-panel {
    display: contents;
  }
}