:root {
  --gold: #ffb800;
  --gold-dim: #d4a012;
  --bg: #050507;
  --bg-surface: #0a0a0d;
  --text: #e8e4dc;
  --text-dim: #8a8578;
  --text-bright: #f5f2eb;
  --serif: 'Cormorant Garamond', Georgia, serif;
  --sans: 'Inter', -apple-system, sans-serif;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  font-size: 18px;
  scrollbar-width: none;
}

html::-webkit-scrollbar { display: none; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--gold);
  color: var(--bg);
}

/* ================================================================
   LANGUAGE SWITCHER — vertical, borderless, free-form
   ================================================================ */
.lang-switch {
  position: fixed;
  top: 2rem;
  right: 2rem;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.15rem;
}

.lang-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.35rem 0;
  cursor: pointer;
  transition: color 0.4s ease, opacity 0.4s ease;
  opacity: 0.4;
}

.lang-btn:hover { color: var(--text); opacity: 0.7; }
.lang-btn.active {
  color: var(--gold);
  opacity: 1;
  font-weight: 500;
}

/* ================================================================
   NAVIGATION
   ================================================================ */
nav {
  position: fixed;
  top: 2rem;
  left: 2rem;
  z-index: 100;
}

nav a {
  display: block;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.3rem 0;
  transition: color 0.3s;
}

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

/* ================================================================
   HERO / SEED
   ================================================================ */
.seed {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 4rem 2rem;
  position: relative;
}

.seed::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 500px;
  height: 500px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(255, 184, 0, 0.04) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

/* Q glyph — oocyte + sperm, calm-glow from ThermoThunder */
.seed-glyph {
  margin-bottom: 3rem;
  animation: calm-glow 6s ease-in-out infinite;
}
.seed-glyph svg {
  display: block;
  width: 120px;
  height: 120px;
}

/* Sperm tail undulation */
@keyframes tail-wave {
  0%   { d: path("M 108 80 C 120 74, 128 86, 140 80"); }
  50%  { d: path("M 108 80 C 120 86, 128 74, 140 80"); }
  100% { d: path("M 108 80 C 120 74, 128 86, 140 80"); }
}
@keyframes sperm-approach {
  0%, 100% { transform: translateX(0); }
  50%      { transform: translateX(-1.5px); }
}
.seed-glyph .sperm-group { animation: sperm-approach 6s ease-in-out infinite; }
.seed-glyph .sperm-tail  { animation: tail-wave 2.4s ease-in-out infinite; }

@keyframes calm-glow {
  0%, 100% {
    opacity: 0.7;
    filter: drop-shadow(0 0 6px rgba(255, 184, 0, 0.15));
  }
  50% {
    opacity: 1;
    filter: drop-shadow(0 0 20px rgba(255, 184, 0, 0.35));
  }
}

.seed h1 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(1.5rem, 4vw, 2.8rem);
  color: var(--text-bright);
  letter-spacing: 0.02em;
  line-height: 1.3;
  max-width: 700px;
  margin-bottom: 1.5rem;
}

.equivalence {
  display: grid;
  grid-template-columns: auto auto auto;
  gap: 0.2rem 1.2rem;
  justify-content: center;
  font-family: var(--serif);
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 400;
  font-style: italic;
  color: var(--text);
  text-align: center;
}

.equivalence .eq-item {
  padding: 0.3rem 0;
  white-space: nowrap;
}



/* ================================================================
   SECTION DIVIDER — 4-arm star (ThermThunder lux system)
   with shimmer-travel on the arms
   ================================================================ */
.divider {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  max-width: 720px;
  padding: 0 2rem;
  position: relative;
}

.divider-star {
  display: block;
  width: 48px;
  height: 24px;
  position: relative;
}

/* Horizontal arm */
.divider-star::before {
  content: '';
  position: absolute;
  top: calc(50% - 0.5px);
  left: 0;
  width: 100%;
  height: 1px;
  background-image:
    linear-gradient(90deg, transparent, rgba(255, 184, 0, 0.8) 30%, rgba(255, 184, 0, 1) 50%, rgba(255, 184, 0, 0.8) 70%, transparent);
  box-shadow: 0 0 6px rgba(255, 184, 0, 0.25);
  animation: star-twinkle-a 4s ease-in-out infinite;
}

/* Vertical arm */
.divider-star::after {
  content: '';
  position: absolute;
  left: calc(50% - 0.5px);
  top: 0;
  width: 1px;
  height: 100%;
  background-image:
    linear-gradient(to bottom, transparent, rgba(255, 184, 0, 0.8) 30%, rgba(255, 184, 0, 1) 50%, rgba(255, 184, 0, 0.8) 70%, transparent);
  box-shadow: 0 0 6px rgba(255, 184, 0, 0.25);
  animation: star-twinkle-b 5.3s ease-in-out infinite;
}

@keyframes star-twinkle-a {
  0%, 100% { opacity: 0.50; }
  12%      { opacity: 0.70; }
  28%      { opacity: 0.45; }
  45%      { opacity: 0.80; }
  62%      { opacity: 0.50; }
  78%      { opacity: 0.65; }
}

@keyframes star-twinkle-b {
  0%, 100% { opacity: 0.45; }
  18%      { opacity: 0.65; }
  35%      { opacity: 0.40; }
  52%      { opacity: 0.75; }
  68%      { opacity: 0.45; }
  85%      { opacity: 0.60; }
}


/* ================================================================
   SECTIONS — molten-reveal entrance
   ================================================================ */
section {
  max-width: 720px;
  margin: 0 auto;
  padding: 8rem 2rem;
}

.section-label {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 2rem;
}

h2 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  color: var(--text-bright);
  line-height: 1.25;
  margin-bottom: 2rem;
}

p {
  margin-bottom: 1.4rem;
  color: var(--text);
}

p.dim { color: var(--text-dim); }

/* ================================================================
   MOLTEN-REVEAL — entrance animation (ThermThunder)
   ================================================================ */
.molten-reveal {
  opacity: 0;
  transform: scale(0.97) translateY(12px);
  filter: blur(4px);
  transition: opacity 0.6s ease, transform 0.6s ease, filter 0.6s ease;
}

.molten-reveal.visible {
  opacity: 1;
  transform: scale(1) translateY(0);
  filter: blur(0);
}

/* ================================================================
   PAPER CARD — shadow-cosmic, borderless
   ================================================================ */
.paper-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: transparent;
  border: none;
  padding: 2.5rem;
  margin: 2rem 0;
  transition: box-shadow 0.5s ease;
  box-shadow:
    0 0 20px rgba(255, 184, 0, 0.03),
    inset 0 0 30px rgba(255, 184, 0, 0.02);
  border-radius: 8px;
}

.paper-card:hover {
  box-shadow:
    0 0 30px rgba(255, 184, 0, 0.08),
    0 0 60px rgba(255, 184, 0, 0.04),
    inset 0 0 40px rgba(255, 184, 0, 0.04);
}

.paper-card h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.3rem;
  color: var(--text-bright);
  line-height: 1.35;
  margin-bottom: 1rem;
}

.paper-card .meta {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 1.2rem;
  letter-spacing: 0.03em;
}

.paper-card .meta span {
  display: inline-block;
  margin-right: 1.5rem;
}

.paper-card p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text);
}

.paper-link {
  display: inline-block;
  margin-top: 1.5rem;
  color: var(--gold);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  border-bottom: 1px solid rgba(255, 184, 0, 0.3);
  padding-bottom: 2px;
  transition: border-color 0.3s;
}

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

/* ================================================================
   THREE PILLARS — borderless, lux-row hover
   ================================================================ */
.pillars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin: 3rem 0;
}

.pillar {
  background: transparent;
  border: none;
  padding: 2rem 2.2rem;
  border-radius: 8px;
  transition: background 0.4s ease, box-shadow 0.4s ease, transform 0.3s ease;
}

/* lux-row hover glow — ThermThunder */
.pillar:hover {
  background: rgba(255, 184, 0, 0.03);
  box-shadow: inset 0 0 30px rgba(255, 184, 0, 0.04);
  transform: translateY(-2px);
}

.pillar-icon {
  font-size: 1.4rem;
  margin-bottom: 1rem;
  opacity: 0.8;
}

.pillar h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.2rem;
  color: var(--text-bright);
  margin-bottom: 0.8rem;
}

.pillar p {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 0.8rem;
}

.pillar a {
  color: var(--gold);
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  opacity: 0.8;
  transition: opacity 0.3s;
}

.pillar a:hover { opacity: 1; }

/* ================================================================
   FORMULA
   ================================================================ */
.formula-block {
  text-align: center;
  padding: 3rem 2rem;
  margin: 2rem 0;
}

.formula {
  font-family: var(--serif);
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 300;
  font-style: italic;
  color: var(--gold);
  letter-spacing: 0.04em;
}

.formula-note {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 1rem;
  font-style: italic;
}

/* ================================================================
   BLOG BRIDGE
   ================================================================ */
.bridge {
  text-align: center;
  padding: 6rem 2rem;
}

.bridge a {
  font-family: var(--serif);
  font-size: 1.3rem;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 184, 0, 0.3);
  padding-bottom: 4px;
  transition: color 0.3s, border-color 0.3s;
}

.bridge a:hover { color: var(--gold); border-color: var(--gold); }

.bridge p {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.8rem;
}

/* ================================================================
   FOOTER
   ================================================================ */
footer {
  text-align: center;
  padding: 4rem 2rem;
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

footer .closing {
  font-family: var(--serif);
  font-size: 1rem;
  font-style: italic;
  color: var(--gold);
  opacity: 0.6;
  margin-bottom: 2rem;
}

footer .author-name {
  font-family: var(--serif);
  font-size: 0.85rem;
  color: var(--text-dim);
  opacity: 0.5;
  margin-bottom: 1rem;
  letter-spacing: 0.08em;
}

footer .author-signature {
  margin-bottom: 1.2rem;
}

footer .author-signature img {
  height: 32px;
  opacity: 0.5;
  filter: drop-shadow(0 0 8px rgba(255, 184, 0, 0.12));
  transition: opacity 0.4s ease;
}

footer .author-signature img:hover {
  opacity: 0.7;
}

footer a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  transition: color 0.3s;
}

footer a:hover { color: var(--text); }

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (min-width: 640px) {
  .pillars { grid-template-columns: 1fr 1fr 1fr; }
  .pillar { padding: 2rem 1.6rem; }
}

@media (max-width: 640px) {
  nav { display: none; }
  .lang-switch { top: 1rem; right: 1rem; }
  section { padding: 5rem 1.5rem; }
}

/* ================================================================
   LANGUAGE SYSTEM
   ================================================================ */
[data-lang] { display: none; }
[data-lang].active-lang { display: block; }
.equivalence [data-lang] { display: none; }
.equivalence [data-lang].active-lang { display: contents; }
.seed h1 [data-lang], .bridge [data-lang] { display: none; }
.seed h1 [data-lang].active-lang { display: inline; }
.bridge [data-lang].active-lang { display: block; }
.pillar [data-lang] { display: none; }
.pillar [data-lang].active-lang { display: block; }
.paper-card [data-lang] { display: none; }
.paper-card [data-lang].active-lang { display: block; }
footer [data-lang] { display: none; }
footer [data-lang].active-lang { display: block; }
.formula-block [data-lang] { display: none; }
.formula-block [data-lang].active-lang { display: block; }