/* ===== палитра и базовые токены ===== */
:root {
  --bg:        #0E0F12;
  --bg-soft:   #15171C;
  --bg-card:   #1B1D24;
  --ink:       #EDE6D6;
  --ink-dim:   #B7AE99;
  --ink-mute:  #7A7466;
  --gold:      #C7A050;
  --gold-hi:   #E0BE6A;
  --copper:    #B97A4A;
  --line:      #2A2D36;
  --line-hi:   #3B3F4B;

  --serif: "Cormorant Garamond", "Times New Roman", Georgia, serif;
  --sans:  "Manrope", "Helvetica Neue", Arial, sans-serif;

  --maxw: 1180px;
  --maxw-wide: 1380px;
  --radius: 14px;
  --radius-sm: 8px;

  --glass-bg: rgba(22,24,30,.42);
  --glass-bg-strong: rgba(22,24,30,.62);
  --glass-tint: 165%;
  --glass-rim-hi: rgba(255,255,255,.16);
  --glass-rim-lo: rgba(255,255,255,.03);
  --glass-shadow:
    inset 0 1px 0 rgba(255,255,255,.18),
    inset 0 -1px 0 rgba(0,0,0,.35),
    0 24px 60px -28px rgba(0,0,0,.6),
    0 2px 8px -4px rgba(0,0,0,.4);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
  --ease-out-soft: cubic-bezier(.16,1,.3,1);
  --blur: 28px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); }
body {
  font-family: var(--sans);
  font-weight: 300;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: var(--gold-hi); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color .15s; }
a:hover { border-bottom-color: var(--gold-hi); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.container-wide { max-width: var(--maxw-wide); }

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: .005em;
  margin: 0;
}
.section-h {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  margin: 0 0 14px;
  color: var(--ink);
}
.section-h em {
  font-style: italic;
  font-family: var(--serif);
  color: var(--gold);
  font-size: .8em;
}
.section-sub {
  color: var(--ink-dim);
  max-width: 780px;
  margin: 0 0 36px;
  font-size: 15px;
}

/* ===== nav ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 28px;
  background: rgba(14,15,18, .6);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid rgba(199,160,80,.12);
}
.nav-search {
  background: transparent;
  border: 1px solid var(--line-hi);
  color: var(--ink-dim);
  font: inherit;
  font-size: 12px;
  letter-spacing: .04em;
  text-transform: uppercase;
  padding: 6px 10px 6px 12px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
}
.nav-search:hover { color: var(--ink); border-color: var(--gold); background: rgba(199,160,80,.06); }
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--serif);
  font-size: 17px;
  border-bottom: none;
  color: var(--ink);
}
.brand-mark { color: var(--gold); font-size: 18px; }
.brand-text em { font-style: italic; color: var(--gold); font-size: .85em; margin-left: 6px; }
.nav-links { display: flex; gap: 22px; flex-wrap: wrap; }
.nav-links a {
  color: var(--ink-dim);
  font-size: 13px;
  letter-spacing: .04em;
  text-transform: uppercase;
  border-bottom: none;
}
.nav-links a:hover { color: var(--gold-hi); }

/* ===== hero ===== */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 60px 28px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 15% 30%, rgba(199,160,80,.22), transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 70%, rgba(185,122,74,.18), transparent 70%),
    linear-gradient(180deg, rgba(14,15,18,.78) 0%, rgba(10,11,15,.92) 100%),
    url('../img/hero/mir-pit.webp') center/cover no-repeat;
  z-index: 0;
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(0deg, transparent 49.5%, rgba(199,160,80,.05) 50%, transparent 50.5%),
    linear-gradient(90deg, transparent 49.5%, rgba(199,160,80,.04) 50%, transparent 50.5%);
  background-size: 64px 64px;
  opacity: .5;
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  width: 100%;
}
.kicker {
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(48px, 9vw, 120px);
  line-height: .95;
  letter-spacing: -.01em;
  margin: 0 0 12px;
}
.hero-period {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(28px, 4vw, 44px);
  color: var(--gold);
  margin-bottom: 28px;
}
.hero-lede {
  max-width: 720px;
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-dim);
  margin-bottom: 40px;
}
.hero-lede strong { color: var(--ink); font-weight: 500; }
.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 32px;
  max-width: 760px;
  margin-bottom: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.hero-stats div { display: flex; flex-direction: column; gap: 4px; }
.hero-stats b {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 42px;
  color: var(--gold);
  line-height: 1;
  background: linear-gradient(180deg, var(--gold-hi), var(--gold) 60%, var(--copper));
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  text-shadow: 0 1px 0 rgba(0,0,0,.4);
}
.hero-stats span { font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-mute); }
.cta {
  display: inline-block;
  padding: 14px 28px;
  border: 1px solid var(--gold);
  color: var(--gold-hi);
  font-size: 13px;
  letter-spacing: .18em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--gold);
  transition: background .2s, color .2s;
}
.cta:hover { background: var(--gold); color: var(--bg); border-bottom-color: var(--gold); }

/* ===== prologue ===== */
.prologue {
  padding: 120px 28px;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
}
.prologue-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 60px;
  align-items: start;
}
.prologue-text p {
  margin: 0 0 18px;
  font-size: 17px;
  color: var(--ink);
}
.prologue-text p:first-child::first-letter {
  font-family: var(--serif);
  font-size: 72px;
  float: left;
  line-height: .85;
  padding: 6px 14px 0 0;
  color: var(--gold);
}
.prologue-text em { font-style: italic; color: var(--gold-hi); }
.prologue-fig { margin: 0; }
.prologue-fig img { border: 1px solid var(--line); }
.prologue-fig figcaption {
  margin-top: 14px;
  font-size: 13px;
  color: var(--ink-mute);
  font-style: italic;
}

/* ===== timeline ===== */
.timeline-section {
  padding: 120px 0;
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
}
.timeline-track {
  display: flex;
  gap: 22px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 24px 4px 30px;
  overflow-y: hidden;
  scrollbar-width: auto;
  scrollbar-color: var(--gold) rgba(255,255,255,.05);
}
.timeline-track::-webkit-scrollbar {
  height: 12px;
}
.timeline-track::-webkit-scrollbar-track {
  background: rgba(255,255,255,.05);
  border-radius: 999px;
  margin: 0 20px;
}
.timeline-track::-webkit-scrollbar-thumb {
  background: var(--gold);
  border-radius: 999px;
  min-width: 100px;
  transition: background .25s var(--ease-out-soft);
}
.timeline-track::-webkit-scrollbar-thumb:hover {
  background: var(--gold-hi);
}
.timeline-track::-webkit-scrollbar-thumb:active {
  background: var(--gold-hi);
}
.timeline-card {
  flex: 0 0 360px;
  scroll-snap-align: start;
  position: relative;
  isolation: isolate;
  padding: 26px 24px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  background:
    var(--glass-bg) padding-box,
    linear-gradient(135deg, var(--glass-rim-hi), var(--glass-rim-lo) 50%, var(--glass-rim-hi)) border-box;
  backdrop-filter: blur(var(--blur)) saturate(var(--glass-tint));
  -webkit-backdrop-filter: blur(var(--blur)) saturate(var(--glass-tint));
  box-shadow: var(--glass-shadow);
  transition: transform .45s var(--ease-spring), box-shadow .35s, opacity .3s;
  overflow: hidden;
}
.timeline-card::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(120% 60% at 30% 0%, rgba(255,255,255,.09), transparent 55%),
    linear-gradient(180deg, rgba(255,255,255,.06), transparent 28%);
  pointer-events: none;
  z-index: -1;
}
.timeline-card::after {
  content: '';
  position: absolute; inset: 0;
  border-radius: inherit;
  background: radial-gradient(80% 60% at 50% 110%, rgba(199,160,80,.22), transparent 60%);
  opacity: 0;
  transition: opacity .5s var(--ease-out-soft);
  pointer-events: none;
  z-index: -1;
}
.timeline-card:hover {
  transform: translateY(-6px) scale(1.015);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.22),
    inset 0 -1px 0 rgba(0,0,0,.35),
    0 18px 50px -20px rgba(199,160,80,.4),
    0 2px 8px -4px rgba(0,0,0,.4);
}
.timeline-card:hover::after { opacity: 1; }
.timeline-card.is-related {
  border-color: var(--gold);
  box-shadow: 0 0 0 1px rgba(224,190,106,.3), 0 12px 40px -16px rgba(199,160,80,.45);
}
.timeline-card.is-dimmed { opacity: .35; }
.timeline-year.is-clickable {
  cursor: pointer;
  transition: color .2s, text-shadow .2s;
}
.timeline-year.is-clickable:hover {
  color: var(--gold-hi);
  text-shadow: 0 0 12px rgba(224,190,106,.35);
}
.timeline-year {
  font-family: var(--serif);
  font-size: 44px;
  font-weight: 500;
  color: var(--gold);
  line-height: 1;
}
.timeline-tag {
  display: inline-block;
  margin-top: 12px;
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--copper);
  border: 1px solid var(--copper);
  padding: 3px 10px;
  border-radius: 12px;
}
.timeline-title {
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.25;
  margin: 14px 0 10px;
  color: var(--ink);
}
.timeline-text {
  font-size: 14px;
  color: var(--ink-dim);
  line-height: 1.55;
  margin: 0 0 14px;
}
.timeline-src {
  font-size: 12px;
  color: var(--ink-mute);
}
.timeline-src a { font-size: 12px; }
.timeline-hint {
  text-align: center;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-top: 12px;
}

/* ===== map ===== */
.map-section {
  padding: 120px 0;
  background: var(--bg);
  border-top: 1px solid var(--line);
}
.mine-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
}
.mine-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-mute);
  font: inherit;
  font-size: 12px;
  letter-spacing: .04em;
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s, opacity .15s;
  opacity: .55;
}
.mine-chip:hover { color: var(--ink); border-color: var(--line-hi); }
.mine-chip.is-active { color: var(--ink); border-color: var(--gold); opacity: 1; background: rgba(199,160,80,.08); }
.mine-chip--all.is-active { border-color: var(--ink); background: rgba(237,230,214,.06); }
.chip-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  display: inline-block;
  flex: 0 0 9px;
}
.map-wrap {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 24px;
}
#leaflet-map {
  height: 560px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #0a0c10;
}
.mine-card {
  position: relative;
  isolation: isolate;
  border-radius: var(--radius);
  border: 1px solid transparent;
  background:
    var(--glass-bg-strong) padding-box,
    linear-gradient(135deg, var(--glass-rim-hi), var(--glass-rim-lo) 50%, var(--glass-rim-hi)) border-box;
  backdrop-filter: blur(32px) saturate(var(--glass-tint));
  -webkit-backdrop-filter: blur(32px) saturate(var(--glass-tint));
  box-shadow: var(--glass-shadow);
  padding: 28px;
  min-height: 560px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.mine-card::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(120% 60% at 30% 0%, rgba(255,255,255,.09), transparent 55%),
    linear-gradient(180deg, rgba(255,255,255,.06), transparent 28%);
  pointer-events: none;
  z-index: -1;
}
.mine-pin svg { transition: transform .35s var(--ease-spring), filter .35s; transform-origin: 11px 28px; }
.mine-pin.is-flash svg {
  transform: scale(1.35);
  filter: drop-shadow(0 0 8px rgba(224,190,106,.8));
}
.mine-card-placeholder {
  margin: auto;
  color: var(--ink-mute);
  font-size: 14px;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.mine-card h3 {
  font-size: 26px;
  color: var(--ink);
  margin: 0 0 4px;
}
.mine-card .mine-company {
  color: var(--gold-hi);
  font-size: 13px;
  letter-spacing: .04em;
  margin-bottom: 18px;
}
.mine-card dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 8px 18px;
  margin: 0 0 18px;
  font-size: 14px;
}
.mine-card dt { color: var(--ink-mute); text-transform: uppercase; letter-spacing: .08em; font-size: 11px; padding-top: 2px; }
.mine-card dd { margin: 0; color: var(--ink); }
.mine-card .mine-facts { color: var(--ink-dim); font-size: 14px; margin: 0 0 18px; line-height: 1.55; }

/* leaflet dark tweaks */
.leaflet-container { background: #0a0c10; font-family: var(--sans) !important; }
.leaflet-tile { filter: grayscale(.6) brightness(.55) contrast(1.1); }
.leaflet-marker-icon { filter: hue-rotate(-20deg) brightness(1.1); }

/* ===== charts ===== */
.charts-section {
  padding: 120px 0;
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
}
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 28px;
}
.chart-card {
  position: relative;
  isolation: isolate;
  border-radius: var(--radius);
  border: 1px solid transparent;
  background:
    var(--glass-bg) padding-box,
    linear-gradient(135deg, var(--glass-rim-hi), var(--glass-rim-lo) 50%, var(--glass-rim-hi)) border-box;
  backdrop-filter: blur(var(--blur)) saturate(var(--glass-tint));
  -webkit-backdrop-filter: blur(var(--blur)) saturate(var(--glass-tint));
  box-shadow: var(--glass-shadow);
  padding: 24px;
  overflow: hidden;
}
.chart-card::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(120% 60% at 30% 0%, rgba(255,255,255,.09), transparent 55%),
    linear-gradient(180deg, rgba(255,255,255,.06), transparent 28%);
  pointer-events: none;
  z-index: -1;
}
.chart-card h3 {
  font-size: 18px;
  color: var(--gold-hi);
  margin: 0 0 18px;
  font-family: var(--sans);
  font-weight: 500;
  letter-spacing: .02em;
}
.chart-card canvas { max-width: 100%; }
.chart-source {
  margin: 14px 0 0;
  font-size: 12px;
  color: var(--ink-mute);
}

/* ===== halls ===== */
.halls-section {
  position: relative;
  padding: 120px 0;
  background:
    linear-gradient(180deg, rgba(14,15,18,.92) 0%, rgba(14,15,18,.52) 18%, rgba(14,15,18,.52) 82%, rgba(14,15,18,.92) 100%),
    url('../img/mirny_halls.webp');
  background-attachment: fixed, fixed;
  background-size: cover, cover;
  background-position: center center, center center;
  border-top: 1px solid var(--line);
  overflow: hidden;
}
.halls-section .container { position: relative; z-index: 1; }

.hall {
  position: relative;
  background:
    radial-gradient(40% 70% at 0% 30%, var(--hall-accent-soft, transparent), transparent 70%),
    radial-gradient(ellipse 70% 60% at 30% 50%, rgba(14,15,18,.85) 0%, rgba(14,15,18,.5) 70%, transparent 100%);
  padding: 40px 24px;
  border-radius: var(--radius);
  margin: 0 -24px;
}
.halls-list { display: flex; flex-direction: column; gap: 80px; }
.hall {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
}
.hall-marker { position: sticky; top: 90px; }
.hall-roman {
  font-family: var(--serif);
  font-style: italic;
  font-size: 120px;
  line-height: .8;
  color: var(--hall-accent, var(--gold));
  opacity: .65;
  text-shadow: 0 0 32px var(--hall-accent-glow, rgba(199,160,80,.4));
}
.hall-years {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--hall-accent, var(--copper));
  margin-top: 14px;
  opacity: .9;
}
.hall h3 {
  font-family: var(--serif);
  font-size: 38px;
  margin: 0 0 18px;
  line-height: 1.1;
}
.hall-lede {
  font-size: 17px;
  color: var(--ink-dim);
  margin: 0 0 32px;
  max-width: 720px;
  line-height: 1.55;
}
.hall-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}
.hall-card {
  position: relative;
  isolation: isolate;
  padding: 22px 22px 18px;
  border-radius: 0 var(--radius) var(--radius) 0;
  border: 1px solid transparent;
  border-left: 3px solid var(--hall-accent, var(--gold));
  background:
    var(--glass-bg) padding-box,
    linear-gradient(135deg, var(--glass-rim-hi), var(--glass-rim-lo) 50%, var(--glass-rim-hi)) border-box;
  backdrop-filter: blur(var(--blur)) saturate(var(--glass-tint));
  -webkit-backdrop-filter: blur(var(--blur)) saturate(var(--glass-tint));
  box-shadow: var(--glass-shadow);
  transition: border-left-color .2s, transform .35s var(--ease-spring), box-shadow .35s;
  overflow: hidden;
}
.hall-card::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(120% 60% at 30% 0%, rgba(255,255,255,.09), transparent 55%),
    linear-gradient(180deg, rgba(255,255,255,.06), transparent 28%);
  pointer-events: none;
  z-index: -1;
}
.hall-card::after {
  content: '';
  position: absolute; inset: 0;
  border-radius: inherit;
  background: radial-gradient(80% 60% at 50% 110%, var(--hall-accent-glow, rgba(199,160,80,.22)), transparent 60%);
  opacity: 0;
  transition: opacity .5s var(--ease-out-soft);
  pointer-events: none;
  z-index: -1;
}
.hall-card:hover {
  transform: translateY(-3px);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.22),
    inset 0 -1px 0 rgba(0,0,0,.35),
    0 14px 38px -18px var(--hall-accent-glow, rgba(199,160,80,.4));
}
.hall-card:hover::after { opacity: 1; }
.hall-card:hover { border-left-color: var(--copper); }
.hall-card.flash-highlight,
.timeline-card.flash-highlight,
.mine-card.flash-highlight { animation: flashGold 1.2s ease-out; }
@keyframes flashGold {
  0%   { box-shadow: 0 0 0 0 rgba(224,190,106,.55); }
  40%  { box-shadow: 0 0 0 6px rgba(224,190,106,.18); }
  100% { box-shadow: 0 0 0 0 rgba(224,190,106,0); }
}
.hall-card-fig {
  margin: -22px -22px 14px -19px;
  padding: 0;
  overflow: hidden;
  border-radius: 0 var(--radius) 0 0;
  position: relative;
}
.hall-card-fig img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  display: block;
  filter: saturate(.85) brightness(.92);
}
.hall-card-fig figcaption {
  position: absolute;
  left: 10px; bottom: 8px;
  font-size: 10px;
  letter-spacing: .06em;
  color: rgba(237,230,214,.7);
  background: rgba(14,15,18,.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 2px 6px;
  border-radius: 3px;
}
.hall-card h4 {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--gold-hi);
  margin: 0 0 12px;
  text-transform: uppercase;
}
.hall-card p { margin: 0 0 12px; font-size: 14px; color: var(--ink); line-height: 1.55; }
.hall-card .src-link { font-size: 12px; }

/* ===== bond ===== */
.bond-section {
  padding: 120px 0;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
  border-top: 1px solid var(--line);
}
.bond-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: start;
}
.bond-grid .bond-calc { position: sticky; top: 90px; }
.bond-text p { margin: 0 0 16px; font-size: 16px; color: var(--ink); line-height: 1.65; }
.bond-text p.bond-lede { font-size: 17px; }
.bond-text strong { color: var(--gold-hi); font-weight: 500; }
.bond-text em { font-style: italic; color: var(--ink); }
.bond-subh {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 28px 0 10px;
}
.bond-source { font-size: 13px; color: var(--ink-mute); margin-top: 22px; }
.bond-source a { font-size: 13px; }
.bond-calc {
  position: relative;
  isolation: isolate;
  border-radius: var(--radius);
  border: 1px solid transparent;
  background:
    linear-gradient(160deg, rgba(199,160,80,.1), rgba(22,24,30,.62)) padding-box,
    linear-gradient(135deg, rgba(224,190,106,.55), rgba(199,160,80,.18) 50%, rgba(224,190,106,.55)) border-box;
  backdrop-filter: blur(28px) saturate(var(--glass-tint));
  -webkit-backdrop-filter: blur(28px) saturate(var(--glass-tint));
  padding: 32px;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.22),
    inset 0 -1px 0 rgba(0,0,0,.35),
    0 28px 70px -28px rgba(199,160,80,.45),
    0 2px 8px -4px rgba(0,0,0,.5);
  overflow: hidden;
}
.bond-calc::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(120% 60% at 30% 0%, rgba(255,255,255,.1), transparent 55%),
    linear-gradient(180deg, rgba(255,255,255,.05), transparent 30%);
  pointer-events: none;
  z-index: -1;
}
.bond-calc h3 {
  font-family: var(--sans);
  color: var(--gold-hi);
  margin: 0 0 24px;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.bond-calc label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}
.bond-calc label span {
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink);
  opacity: .82;
}
.bond-calc input {
  background: rgba(10,11,15,.92);
  border: 1px solid rgba(199,160,80,.28);
  color: var(--ink);
  padding: 11px 14px;
  font-family: var(--sans);
  font-size: 16px;
  border-radius: 4px;
}
.bond-calc input:focus { outline: none; border-color: var(--gold); }
.bond-out {
  margin: 24px 0 12px;
  padding: 18px;
  background: rgba(10,11,15,.78);
  border: 1px solid rgba(199,160,80,.18);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.bond-out div { display: flex; justify-content: space-between; align-items: baseline; }
.bond-out span { color: var(--ink); opacity: .72; font-size: 13px; }
.bond-out b { font-family: var(--serif); font-size: 22px; color: var(--ink); font-weight: 500; }
.bond-total { padding-top: 10px; border-top: 1px solid var(--line); }
.bond-total b { color: var(--gold); font-size: 28px; }
.bond-disclaimer { font-size: 11px; color: var(--ink-mute); margin: 6px 0 0; line-height: 1.5; }

/* ===== gallery ===== */
.gallery-section {
  padding: 120px 0;
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
}
.gallery-grid {
  columns: 4 280px;
  column-gap: 14px;
}
.gallery-item {
  break-inside: avoid;
  margin: 0 0 14px;
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: border-color .2s;
}
.gallery-item:hover { border-color: var(--gold); }
.gallery-item img { width: 100%; height: auto; display: block; }
.gallery-item figcaption {
  padding: 12px 14px;
  font-size: 12px;
  color: var(--ink-dim);
  line-height: 1.45;
  font-style: italic;
}

/* ===== sources ===== */
.sources-section {
  padding: 120px 0;
  background: var(--bg);
  border-top: 1px solid var(--line);
}
.sources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 40px;
}
.sources-grid h3 {
  font-size: 14px;
  font-family: var(--sans);
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 16px;
}
.sources-grid ul { list-style: none; padding: 0; margin: 0; }
.sources-grid li { margin-bottom: 12px; font-size: 14px; color: var(--ink-dim); line-height: 1.5; }
.sources-grid a { font-size: 14px; }

/* ===== footer ===== */
.footer {
  padding: 50px 0;
  background: #08090C;
  border-top: 1px solid var(--line);
  text-align: center;
}
.footer p { margin: 6px 0; font-size: 13px; color: var(--ink-mute); }

/* ===== reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition:
    opacity .9s var(--ease-out-soft),
    transform .9s var(--ease-out-soft);
}
.reveal.in { opacity: 1; transform: none; }

/* ===== scroll progress (top bar) ===== */
.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--gold-hi));
  transform-origin: 0 50%;
  transform: scaleX(0);
  z-index: 1001;
  pointer-events: none;
}
@supports (animation-timeline: scroll()) {
  .scroll-progress {
    animation: scroll-prog linear;
    animation-timeline: scroll(root);
  }
  @keyframes scroll-prog { to { transform: scaleX(1); } }
}

/* ===== right side nav: liquid-glass panel with dotted chapter list ===== */
.side-nav {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 900;
  padding: 22px 24px;
  border-radius: 24px;
  border: 1px solid transparent;
  background:
    rgba(22,24,30,.55) padding-box,
    linear-gradient(160deg, rgba(255,255,255,.18), rgba(255,255,255,.02) 50%, rgba(255,255,255,.14)) border-box;
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.12),
    inset 0 -1px 0 rgba(0,0,0,.3),
    0 16px 40px -18px rgba(0,0,0,.6);
}
.side-nav-list {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.side-nav-list li {
  display: block;
}
.side-nav-list a {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--ink-mute);
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  white-space: nowrap;
  text-decoration: none;
  transition: color .25s var(--ease-out-soft), transform .35s var(--ease-out-soft);
}
.side-nav-list .dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1.5px solid rgba(199,160,80,.4);
  background: transparent;
  transition: background .3s var(--ease-out-soft),
              border-color .3s var(--ease-out-soft),
              box-shadow .3s var(--ease-out-soft),
              transform .3s var(--ease-out-soft);
}
.side-nav-list .label {
  display: inline-block;
}
.side-nav-list a:hover {
  color: var(--ink);
  transform: translateX(-2px);
}
.side-nav-list a:hover .dot {
  border-color: rgba(224,190,106,.75);
}
.side-nav-list li.is-passed a {
  color: var(--gold);
}
.side-nav-list li.is-passed .dot {
  background: var(--gold);
  border-color: var(--gold);
}
.side-nav-list li.is-current a {
  color: var(--gold-hi);
}
.side-nav-list li.is-current .dot {
  background: var(--gold-hi);
  border-color: var(--gold-hi);
  transform: scale(1.35);
  box-shadow: 0 0 12px rgba(224,190,106,.65), 0 0 22px rgba(224,190,106,.35);
}
@media (max-width: 959px) {
  .side-nav { display: none; }
}

/* ===== search modal ===== */
.search-modal {
  border: 1px solid var(--glass-border);
  background: rgba(14,15,18,.78);
  backdrop-filter: blur(30px) saturate(140%);
  -webkit-backdrop-filter: blur(30px) saturate(140%);
  color: var(--ink);
  padding: 0;
  border-radius: 10px;
  width: min(640px, 92vw);
  max-height: 70vh;
  overflow: hidden;
  box-shadow: 0 40px 100px -30px rgba(0,0,0,.7);
}
.search-modal::backdrop {
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(4px);
}
.search-modal[open] {
  display: flex;
  flex-direction: column;
}
.search-input {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--glass-border);
  color: var(--ink);
  font: inherit;
  font-family: var(--serif);
  font-size: 22px;
  padding: 18px 22px;
  outline: none;
  width: 100%;
}
.search-input::placeholder { color: var(--ink-mute); font-style: italic; }
.search-results {
  list-style: none;
  margin: 0; padding: 8px 0;
  overflow-y: auto;
  max-height: calc(70vh - 70px);
}
.search-results li {
  padding: 10px 22px;
  cursor: pointer;
  border-left: 2px solid transparent;
  transition: background .15s, border-color .15s;
}
.search-results li:hover,
.search-results li.is-focus {
  background: rgba(199,160,80,.07);
  border-left-color: var(--gold);
}
.search-results .sr-section {
  font-size: 10px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 4px;
}
.search-results .sr-title {
  font-family: var(--serif);
  font-size: 17px;
  color: var(--ink);
  margin-bottom: 2px;
}
.search-results .sr-snippet {
  font-size: 13px;
  color: var(--ink-dim);
  line-height: 1.45;
}
.search-empty {
  padding: 24px 22px;
  color: var(--ink-mute);
  font-style: italic;
  text-align: center;
}

/* ===== motion preferences ===== */
@media (prefers-reduced-motion: reduce) {
  .reveal { transition: none; transform: none; opacity: 1; }
  .timeline-card,
  .hall-card,
  .mine-card,
  .chart-card { transition: none; }
  .timeline-card:hover { transform: none; }
  .mine-pin svg { transition: none; }
  .scroll-progress { display: none; }
  .hero-bg { transform: none !important; }
}

/* ===== responsive ===== */
@media (max-width: 960px) {
  .prologue-grid,
  .map-wrap,
  .bond-grid,
  .hall { grid-template-columns: 1fr; gap: 32px; }
  .hall-marker { position: static; }
  .hall-roman { font-size: 80px; }
  .nav { padding: 12px 18px; }
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 11px; }
  .brand-text em { display: none; }
  .container, .container-wide { padding: 0 18px; }
  .hero { padding: 40px 18px; min-height: 80vh; }
  .timeline-card { flex-basis: 78vw; }
  #leaflet-map { height: 380px; }
  .mine-card { min-height: auto; }
}