/* ==========================================================================
   The 78 Atomic Structure — main stylesheet
   Recreated from the Claude Design handoff. Tokens mirror the prototype exactly.
   ========================================================================== */

:root {
  --bg:        #12121a;   /* page */
  --bg-alt:    #0a0a0f;   /* alternating sections + body */
  --card:      #22222e;
  --panel:     #1a1a24;
  --line:      #2a2a38;
  --line-hi:   #3a3a48;
  --gold:      #c9a84c;
  --gold-hi:   #e6c656;
  --gold-dim:  #8b7019;
  --ink:       #e8e6e3;
  --muted:     #a8a5a0;
  --faint:     #6b6860;
  --ease:      cubic-bezier(0.22, 0.61, 0.36, 1);
  --display:   'Cinzel', serif;
  --body:      'Cormorant Garamond', serif;
}

html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg-alt); color: var(--ink); }

a { color: var(--gold); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--gold-hi); }

* { box-sizing: border-box; }

/* --- Root canvas ---------------------------------------------------------- */
.uas {
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 18px;
  line-height: 1.6;
  overflow-x: hidden;
}

/* --- Starfield ------------------------------------------------------------ */
@keyframes twinkleA { 0%,100% { opacity: .25 } 50% { opacity: .7 } }
@keyframes twinkleB { 0%,100% { opacity: .55 } 50% { opacity: .15 } }

.starfield {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
}
.starfield--a {
  background-image:
    radial-gradient(1px 1px at 42px 67px, rgba(232,230,227,.8), transparent 55%),
    radial-gradient(1px 1px at 165px 24px, rgba(232,230,227,.6), transparent 55%),
    radial-gradient(1.4px 1.4px at 220px 150px, rgba(201,168,76,.55), transparent 55%),
    radial-gradient(1px 1px at 95px 205px, rgba(232,230,227,.7), transparent 55%);
  background-size: 280px 260px;
  animation: twinkleA 9s ease-in-out infinite;
}
.starfield--b {
  background-image:
    radial-gradient(1px 1px at 30px 140px, rgba(232,230,227,.65), transparent 55%),
    radial-gradient(1.6px 1.6px at 180px 80px, rgba(232,230,227,.5), transparent 55%),
    radial-gradient(1px 1px at 120px 30px, rgba(184,198,219,.5), transparent 55%);
  background-size: 340px 320px;
  animation: twinkleB 13s ease-in-out infinite;
}
@media (prefers-reduced-motion: reduce) {
  .starfield { animation: none; }
}

/* --- Navigation ----------------------------------------------------------- */
.uas-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10,10,15,0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.uas-nav__inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.uas-nav__brand {
  font-family: var(--display); font-weight: 600; font-size: 14px; letter-spacing: .12em;
  color: var(--ink); display: flex; align-items: center; gap: 10px;
}
.uas-nav__brand:hover { color: var(--ink); }
.uas-nav__brand span { color: var(--gold); }
.uas-nav__links {
  display: flex; gap: 28px; font-family: var(--display); font-size: 12px; letter-spacing: .12em;
}
.uas-nav__link { color: var(--muted); }
.uas-nav__link:hover,
.uas-nav__link.is-active { color: var(--gold-hi); }

/* --- Shared typographic pieces ------------------------------------------- */
.uas-section { position: relative; z-index: 1; }
.uas-section--alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.uas-eyebrow {
  font-family: var(--display); font-size: 13px; letter-spacing: .15em; color: var(--gold-dim);
}
.uas-h1 {
  font-family: var(--display); font-weight: 500; font-size: 44px; line-height: 1.15;
  letter-spacing: .05em; margin: 0 auto 24px; max-width: 820px;
}
.uas-h1--home { font-size: 52px; }
.uas-h2 {
  font-family: var(--display); font-weight: 500; font-size: 32px; letter-spacing: .05em; margin: 0 0 24px;
}
.uas-h2--sm { font-size: 28px; }
.uas-lead {
  font-size: 21px; line-height: 1.7; color: var(--muted); max-width: 680px; margin: 0 auto;
  text-wrap: pretty;
}
.uas-prose p { text-wrap: pretty; }
.uas-prose em { font-style: italic; }

/* --- Glyph rendering ------------------------------------------------------ */
.uas-glyph {
  filter: invert(1) sepia(0.35) saturate(1.3) brightness(0.95);
  mix-blend-mode: screen;
}
.uas-glyph-bg {
  width: 100%; aspect-ratio: 1 / 1;
  background-size: contain; background-repeat: no-repeat; background-position: center;
  filter: invert(1) sepia(0.35) saturate(1.3) brightness(0.95);
  mix-blend-mode: screen; opacity: 0.9;
}

/* --- Buttons -------------------------------------------------------------- */
.uas-btn {
  display: inline-block; font-family: var(--display); font-size: 13px; letter-spacing: .1em;
  border-radius: 4px; padding: 14px 28px; transition: all .2s var(--ease); cursor: pointer;
}
.uas-btn--gold { color: var(--gold); border: 1px solid var(--gold); background: transparent; }
.uas-btn--gold:hover {
  background: var(--gold); color: var(--bg-alt); box-shadow: 0 0 16px rgba(201,168,76,0.3);
}
.uas-btn--ghost { color: var(--muted); border: 1px solid var(--line-hi); background: transparent; }
.uas-btn--ghost:hover { border-color: var(--gold); color: var(--gold-hi); }
.uas-btn-row { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* --- Divider -------------------------------------------------------------- */
.uas-divider {
  position: relative; z-index: 1; display: flex; align-items: center; gap: 16px;
  max-width: 520px; margin: 0 auto;
}
.uas-divider__rule { flex: 1; height: 1px; }
.uas-divider__rule--l { background: linear-gradient(to right, transparent, var(--gold-dim)); }
.uas-divider__rule--r { background: linear-gradient(to left, transparent, var(--gold-dim)); }
.uas-divider__star { color: var(--gold); font-size: 14px; }

/* --- Footer --------------------------------------------------------------- */
.uas-footer {
  position: relative; z-index: 1; border-top: 1px solid var(--line);
  padding: 48px 24px; text-align: center; color: var(--faint); font-size: 16px;
}
.uas-footer__links {
  display: flex; justify-content: center; gap: 24px; font-family: var(--display);
  font-size: 12px; letter-spacing: .12em; margin-bottom: 20px;
}
.uas-footer__links a { color: var(--muted); }
.uas-footer__links a:hover { color: var(--gold-hi); }

/* --- Generic containers --------------------------------------------------- */
.uas-wrap { position: relative; z-index: 1; margin: 0 auto; }
.hero { position: relative; z-index: 1; padding: 150px 24px 64px; text-align: center; }
.hero--home { padding: 170px 24px 90px; }
.hero__glyph { width: 280px; height: 280px; opacity: .92; margin-bottom: 28px; }
.hero .uas-eyebrow { display: block; margin-bottom: 20px; }

/* ==========================================================================
   ATOMS page
   ========================================================================== */
.atoms-legend {
  position: relative; z-index: 1; max-width: 900px; margin: 0 auto 64px; padding: 0 24px;
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; text-align: center;
  font-size: 17px; color: var(--muted);
}
.atoms-legend__item { padding-top: 12px; }
.atoms-legend__item--heavy { border-top: 1px solid var(--gold); }
.atoms-legend__item--medium { border-top: 1px solid var(--gold-dim); }
.atoms-legend__item--hair { border-top: 1px solid var(--line-hi); }
.atoms-legend__item span {
  font-family: var(--display); font-size: 13px; letter-spacing: .1em; color: var(--gold-hi);
}
.atom-grid {
  position: relative; z-index: 1; max-width: 1200px; margin: 0 auto; padding: 0 24px 80px;
}
.atom-grid__inner { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.atom-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 14px;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  transition: border-color .2s var(--ease);
}
.atom-card:hover { border-color: var(--line-hi); }
.atom-card__label {
  font-family: var(--display); font-size: 12px; letter-spacing: .08em; color: var(--ink); text-align: center;
}
.atom-card__regs { font-size: 14px; color: var(--faint); text-align: center; }

/* ==========================================================================
   WORDS page
   ========================================================================== */
.words-stats {
  position: relative; z-index: 1; max-width: 900px; margin: 0 auto 80px; padding: 0 24px;
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; text-align: center;
}
.stat-card { border: 1px solid var(--line); border-radius: 8px; background: var(--panel); padding: 24px; }
.stat-card__num { font-family: var(--display); font-size: 30px; color: var(--gold-hi); }
.stat-card__cap { color: var(--muted); font-size: 17px; }
.word-section {
  position: relative; z-index: 1; max-width: 1200px; margin: 0 auto; padding: 0 24px 80px;
  scroll-margin-top: 84px;
}
.word-head {
  display: flex; align-items: baseline; gap: 16px;
  border-bottom: 1px solid var(--line); padding-bottom: 12px; margin-bottom: 24px;
}
.word-head h2 {
  font-family: var(--display); font-weight: 500; font-size: 26px; letter-spacing: .05em; margin: 0;
}
.word-head span { color: var(--faint); font-size: 17px; }
.word-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.word-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 16px;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  transition: border-color .2s var(--ease); color: var(--ink);
}
.word-card:hover { border-color: var(--line-hi); }
.word-card__name {
  font-family: var(--display); font-size: 13px; letter-spacing: .08em; text-align: center;
}
.word-card__card { font-size: 14px; color: var(--faint); font-style: italic; text-align: center; }

/* ==========================================================================
   LATTICE page
   ========================================================================== */
.lat-formula { position: relative; z-index: 1; max-width: 900px; margin: 0 auto 80px; padding: 0 24px; }
.lat-formula__box {
  border: 1px solid var(--gold); border-radius: 8px; background: var(--panel);
  box-shadow: 0 0 12px rgba(201,162,39,0.2); padding: 32px; text-align: center;
}
.lat-formula__box p {
  font-size: 22px; line-height: 1.7; color: var(--ink); margin: 0; font-style: italic; text-wrap: pretty;
}
.lat-cols {
  position: relative; z-index: 1; max-width: 1100px; margin: 0 auto 80px; padding: 0 24px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start;
}
.lat-cols h2 {
  font-family: var(--display); font-weight: 500; font-size: 24px; letter-spacing: .05em; margin: 0 0 12px;
}
.lat-cols p { color: var(--muted); font-size: 17px; margin: 0 0 20px; text-wrap: pretty; }
.lat-table { border: 1px solid var(--line); border-radius: 8px; background: var(--panel); overflow: hidden; font-size: 16px; }
.lat-table__row { display: grid; padding: 8px 16px; border-bottom: 1px solid var(--line); color: var(--muted); }
.lat-table__row:last-child { border-bottom: none; }
.lat-table__row--head {
  padding: 10px 16px; font-family: var(--display); font-size: 12px; letter-spacing: .1em; color: var(--gold-dim);
}
.lat-table--seats .lat-table__row { grid-template-columns: 1fr 1fr 1fr; }
.lat-table--travel .lat-table__row { grid-template-columns: 1.2fr .6fr .7fr .6fr 1.4fr; }

.lat-play { padding: 80px 24px; }
.lat-play__head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 24px;
  flex-wrap: wrap; margin-bottom: 8px;
}
.lat-play__head h2 {
  font-family: var(--display); font-weight: 500; font-size: 28px; letter-spacing: .05em; margin: 0;
}
.lat-play__intro { color: var(--muted); font-size: 17px; margin: 0 0 24px; max-width: 720px; text-wrap: pretty; }
.reg-switch { display: flex; gap: 8px; }
.reg-btn {
  font-family: var(--display); font-size: 12px; letter-spacing: .08em; padding: 8px 14px;
  border-radius: 4px; cursor: pointer; transition: all .2s;
  background: transparent; color: var(--muted); border: 1px solid var(--line-hi);
}
.reg-btn.is-active { background: var(--gold); color: var(--bg-alt); border: 1px solid var(--gold); }
.play-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.play-row {
  display: flex; align-items: center; gap: 12px; background: var(--card);
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; cursor: pointer;
  transition: border-color .2s var(--ease);
}
.play-row:hover { border-color: var(--line-hi); }
.play-mark {
  width: 30px; height: 30px; flex: none; border: 1px solid var(--gold); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; color: var(--gold); font-size: 10px;
}
.play-row__label { flex: 1; font-family: var(--display); font-size: 13px; letter-spacing: .06em; }
.play-row__info { color: var(--faint); font-size: 15px; }

.still-open { max-width: 760px; margin: 0 auto; }
.still-open__list { display: flex; flex-direction: column; gap: 20px; font-size: 19px; color: var(--muted); }
.still-open__item { border-left: 2px solid var(--gold-dim); padding-left: 20px; }
.still-open__item span {
  font-family: var(--display); font-size: 13px; letter-spacing: .1em; color: var(--gold-hi);
}

/* ==========================================================================
   PROVENANCE page
   ========================================================================== */
.prov-meta { color: var(--faint); font-size: 16px; font-family: var(--display); letter-spacing: .08em; }
.prov-article { position: relative; z-index: 1; max-width: 800px; margin: 0 auto; padding: 0 24px 80px; }
.prov-sec { padding: 48px 0; border-top: 1px solid var(--line); }
.prov-sec h2 {
  font-family: var(--display); font-weight: 500; font-size: 28px; letter-spacing: .05em; margin: 0 0 24px;
}
.prov-sec p { text-wrap: pretty; }
.prov-defs { display: flex; flex-direction: column; gap: 24px; font-size: 18px; }
.prov-def__term {
  font-family: var(--display); font-size: 14px; letter-spacing: .1em; color: var(--gold-hi); margin-bottom: 6px;
}
.prov-def p { margin: 0; color: var(--muted); line-height: 1.7; }
.prov-lineage { display: flex; flex-direction: column; gap: 20px; font-size: 18px; }
.prov-lineage__item { border-left: 2px solid var(--line-hi); padding-left: 20px; }
.prov-lineage__item .who { color: var(--ink); }
.prov-lineage__item .date { color: var(--faint); }
.prov-lineage__item p { margin: 4px 0 0; color: var(--muted); line-height: 1.7; }
.prov-list {
  margin: 0; padding-left: 24px; display: flex; flex-direction: column; gap: 14px;
  font-size: 19px; line-height: 1.7; color: var(--muted);
}
.prov-sources {
  margin: 0; padding-left: 24px; display: flex; flex-direction: column; gap: 10px;
  font-size: 18px; line-height: 1.7; color: var(--muted);
}

/* ==========================================================================
   FULL INDEX page
   ========================================================================== */
.index-sec { position: relative; z-index: 1; max-width: 1200px; margin: 0 auto; padding: 0 24px 80px; }
.index-sec__head { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.index-sec__head h2 {
  font-family: var(--display); font-weight: 500; font-size: 26px; letter-spacing: .05em; margin: 0; white-space: nowrap;
}
.index-sec__rule { flex: 1; height: 1px; background: linear-gradient(to right, var(--gold-dim), transparent); }
.index-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; }
.index-card { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.index-card .uas-glyph-bg { opacity: .85; }
.index-card__label {
  font-family: var(--display); font-size: 11px; letter-spacing: .08em; color: var(--muted); text-align: center;
}
.index-card__card { font-size: 13px; color: var(--faint); font-style: italic; text-align: center; }

/* ==========================================================================
   HOMEPAGE
   ========================================================================== */
.home-anatomy { max-width: 1100px; margin: 0 auto; }
.home-anatomy__head { text-align: center; margin-bottom: 64px; }
.home-anatomy__head .uas-eyebrow { display: block; margin-bottom: 16px; }
.home-anatomy__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.home-anatomy__notes { display: flex; flex-direction: column; gap: 32px; }
.home-note { padding-left: 24px; }
.home-note--gold { border-left: 2px solid var(--gold); }
.home-note--dim { border-left: 2px solid var(--gold-dim); }
.home-note--line { border-left: 2px solid var(--line-hi); }
.home-note__term {
  font-family: var(--display); font-size: 14px; letter-spacing: .1em; color: var(--gold-hi); margin-bottom: 8px;
}
.home-note p { margin: 0; color: var(--muted); font-size: 19px; line-height: 1.7; text-wrap: pretty; }

.kamea-legend {
  margin-top: 64px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel);
  padding: 24px; display: flex; justify-content: center; flex-wrap: wrap;
}
.kamea-legend__cell {
  display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 0 28px;
  border-right: 1px solid var(--line);
}
.kamea-legend__cell:last-child { border-right: none; }
.kamea-legend__glyph { font-size: 26px; color: var(--gold); }
.kamea-legend__num { font-family: var(--display); font-size: 20px; }
.kamea-legend__name { font-size: 14px; color: var(--faint); }
.kamea-caption { text-align: center; color: var(--faint); font-size: 16px; font-style: italic; margin: 16px 0 0; }

.families-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.family-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 28px;
  display: flex; flex-direction: column; gap: 16px; color: var(--ink);
  transition: border-color .2s var(--ease);
}
.family-card:hover { border-color: var(--gold); }
.family-card__name {
  font-family: var(--display); font-size: 16px; letter-spacing: .08em; margin-bottom: 6px;
}
.family-card__desc { color: var(--muted); font-size: 17px; line-height: 1.5; }
.families-total {
  text-align: center; margin-top: 48px; font-family: var(--display); font-size: 15px;
  letter-spacing: .1em; color: var(--muted);
}
.families-total span { color: var(--gold-hi); }

.twins { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.twins__list { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 32px; font-size: 17px; color: var(--muted); }
.twins__pair { display: flex; align-items: center; gap: 16px; }
.twins__fig { flex: 1; text-align: center; }
.twins__fig .caption {
  font-family: var(--display); font-size: 13px; letter-spacing: .1em; color: var(--muted); margin-top: 8px;
}
.twins__star { color: var(--gold); font-size: 20px; }

.acoustic { max-width: 1100px; margin: 0 auto; }
.acoustic__head { text-align: center; margin-bottom: 56px; }
.acoustic__head .uas-eyebrow { display: block; margin-bottom: 16px; }
.acoustic__grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.acoustic-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 16px;
  display: flex; flex-direction: column; align-items: center; gap: 10px; cursor: pointer;
  transition: border-color .2s var(--ease);
}
.acoustic-card:hover { border-color: var(--line-hi); }
.acoustic-card__label {
  font-family: var(--display); font-size: 12px; letter-spacing: .08em; color: var(--muted); text-align: center;
}
.index-preview { display: grid; grid-template-columns: repeat(12, 1fr); gap: 12px; margin-bottom: 48px; }
.index-preview .uas-glyph { width: 100%; opacity: .75; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .uas-nav__inner { gap: 12px; }
  .uas-nav__links { gap: 16px; flex-wrap: wrap; justify-content: flex-end; }
  .uas-h1 { font-size: 34px; }
  .uas-h1--home { font-size: 38px; }
  .uas-h2 { font-size: 26px; }
  .hero { padding: 132px 20px 48px; }
  .hero--home { padding: 140px 20px 64px; }
  .atom-grid__inner { grid-template-columns: repeat(3, 1fr); }
  .acoustic__grid { grid-template-columns: repeat(3, 1fr); }
  .index-grid { grid-template-columns: repeat(4, 1fr); }
  .word-grid { grid-template-columns: repeat(2, 1fr); }
  .families-grid { grid-template-columns: 1fr; }
  .lat-cols { grid-template-columns: 1fr; gap: 32px; }
  .home-anatomy__grid { grid-template-columns: 1fr; gap: 40px; }
  .twins { grid-template-columns: 1fr; gap: 40px; }
  .play-grid { grid-template-columns: 1fr; }
  .kamea-legend__cell { padding: 8px 18px; }
}
@media (max-width: 560px) {
  .atoms-legend { grid-template-columns: 1fr; }
  .words-stats { grid-template-columns: 1fr; }
  .atom-grid__inner { grid-template-columns: repeat(2, 1fr); }
  .index-grid { grid-template-columns: repeat(3, 1fr); }
  .word-grid { grid-template-columns: 1fr; }
  .index-preview { grid-template-columns: repeat(6, 1fr); }
  .twins__list { grid-template-columns: 1fr; }
  .uas-nav__brand span + * { display: none; }
}