:root {
  --bg: #0e1116;
  --bg-soft: #161b22;
  --card: #1c232d;
  --text: #e8ecf1;
  --muted: #9aa6b2;
  --line: #2a323d;
  --accent: #6c8cff;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

h1,
h2,
h3,
h4 {
  font-family: "Fraunces", Georgia, serif;
  font-weight: 600;
  line-height: 1.15;
  margin: 0;
}

a {
  color: inherit;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color: #fff;
  background: #1a1510 url("rock_background.jpg") center / cover no-repeat;
  overflow: hidden;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(14, 17, 22, 0.35) 0%, rgba(14, 17, 22, 0.78) 100%),
    linear-gradient(90deg, rgba(14, 17, 22, 0.55) 0%, rgba(14, 17, 22, 0.2) 55%, rgba(14, 17, 22, 0.45) 100%);
  pointer-events: none;
}

.nav {
  position: relative;
  z-index: 2;
  max-width: var(--max);
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  font-family: "Fraunces", serif;
  font-size: 1.2rem;
  font-weight: 600;
}

.nav__links {
  display: flex;
  gap: 1.6rem;
  font-size: 0.95rem;
}

.nav__links a {
  text-decoration: none;
  opacity: 0.85;
  transition: opacity 0.2s;
}

.nav__links a:hover {
  opacity: 1;
}

.lang-toggle {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #fff;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.lang-toggle:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.45);
}

.hero__content {
  position: relative;
  z-index: 2;
  margin: auto;
  max-width: var(--max);
  width: 100%;
  padding: 2rem 1.5rem 6rem;
}

.hero__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.8rem;
  color: #b9c6ff;
  margin: 0 0 1rem;
}

.hero__title {
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  margin: 0 0 1.2rem;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.55);
}

.hero__lede {
  max-width: 38rem;
  font-size: 1.12rem;
  color: rgba(255, 255, 255, 0.92);
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.5);
}

.hero__cta {
  display: inline-block;
  margin-top: 1.8rem;
  padding: 0.85rem 1.6rem;
  background: #fff;
  color: #102a43;
  font-weight: 600;
  text-decoration: none;
  border-radius: 999px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.hero__cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

/* ---------- Sections ---------- */
main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-head {
  text-align: center;
  margin: 4.5rem auto 2rem;
  max-width: 40rem;
}

.section-head h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.section-head p {
  color: var(--muted);
  margin: 0.5rem 0 0;
}

/* ---------- Map ---------- */
.map-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 1.5rem;
  align-items: stretch;
}

.map {
  min-height: 560px;
  height: 100%;
  border-radius: 18px;
  border: 1px solid var(--line);
  overflow: hidden;
  z-index: 0;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.6rem;
  max-height: 560px;
  overflow-y: auto;
  border-top: 4px solid var(--accent);
}

.panel--empty {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.panel__placeholder-icon {
  font-size: 2.4rem;
  display: block;
  margin-bottom: 0.6rem;
}

.panel__placeholder p {
  color: var(--muted);
}

.quicklist {
  list-style: none;
  padding: 0;
  margin: 1.4rem 0 0;
  display: grid;
  gap: 0.5rem;
  text-align: left;
}

.quicklist button {
  width: 100%;
  text-align: left;
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem 0.8rem;
  font: inherit;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.15s;
}

.quicklist button:hover {
  border-color: var(--accent);
  transform: translateX(3px);
}

.panel__cover {
  width: 100%;
  height: auto;
  max-height: min(420px, 55vh);
  object-fit: contain;
  border-radius: 12px;
  margin-bottom: 1rem;
  display: block;
  border: 1px solid var(--line);
  background: #121820;
  padding: 0.5rem;
  box-sizing: border-box;
}

.panel__cover--fallback {
  height: 220px;
  border-radius: 12px;
  margin-bottom: 1rem;
}

.panel__photos {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.65rem;
  margin-bottom: 0.5rem;
}

.panel__photo {
  margin: 0;
  background: #121820;
  border-radius: 10px;
  border: 1px solid var(--line);
  padding: 0.35rem;
}

.panel__photo img {
  width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: 8px;
  display: block;
}

.panel__badge {
  display: inline-block;
  background: var(--accent);
  color: #0e1116;
  font-weight: 600;
  font-size: 0.8rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
}

.panel__header h3 {
  font-size: 1.7rem;
  margin: 0.6rem 0 0.2rem;
}

.panel__sub {
  color: var(--muted);
  margin: 0;
  font-size: 0.95rem;
}

.panel__region {
  margin: 0.4rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.panel__story {
  margin: 1.2rem 0;
  color: #d4dbe3;
}

.panel__detail {
  margin: 0 0 1rem;
  font-size: 0.92rem;
  color: #b8c4d0;
  line-height: 1.65;
  white-space: pre-line;
}

.panel__rocks-title {
  font-size: 1.1rem;
  margin: 1.2rem 0 0.6rem;
}

/* ---------- Rocks ---------- */
.rock-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.9rem;
}

.rock {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.8rem;
}

.rock__stone {
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  border-radius: 46% 54% 58% 42% / 52% 44% 56% 48%;
  box-shadow: inset 0 -4px 8px rgba(0, 0, 0, 0.35),
    0 3px 6px rgba(0, 0, 0, 0.3);
}

.rock__name {
  margin: 0;
  font-weight: 600;
}

.rock__type {
  margin: 0.05rem 0;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.rock__note {
  margin: 0.2rem 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

/* ---------- Collection ---------- */
.specimen-section {
  margin-bottom: 1rem;
}

.specimen-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 1.5rem;
  align-items: stretch;
}

.specimen-viewer-wrap {
  position: relative;
  min-height: 480px;
  height: 480px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: #0e1116;
  overflow: hidden;
}

.specimen-viewer-wrap.is-ready .specimen-status {
  opacity: 0;
  visibility: hidden;
}

.specimen-canvas-host {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.specimen-canvas-host canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.specimen-status {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  background: rgba(14, 17, 22, 0.85);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
  z-index: 2;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  pointer-events: none;
}

.specimen-status.hidden {
  display: none;
}

.specimen-poster {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 2rem;
  opacity: 1;
  transition: opacity 0.4s ease, visibility 0.4s ease;
  pointer-events: none;
  z-index: 0;
}

.specimen-canvas-host {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.specimen-canvas-host canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.specimen-status {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  background: rgba(14, 17, 22, 0.85);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
  z-index: 2;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.specimen-fallback {
  display: none;
}

.specimen-controls-hint {
  position: absolute;
  bottom: 0.85rem;
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  background: rgba(14, 17, 22, 0.85);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
  z-index: 3;
  pointer-events: none;
}

.specimen-link--ar {
  margin-top: 0.35rem;
}

.specimen-meta {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.specimen-reference-photo {
  width: 100%;
  height: auto;
  max-height: min(360px, 45vh);
  object-fit: contain;
  border-radius: 12px;
  margin-bottom: 1.2rem;
  border: 1px solid var(--line);
  background: #121820;
  padding: 0.5rem;
  box-sizing: border-box;
}

.specimen-meta h3 {
  font-size: 1.4rem;
  margin-bottom: 0.6rem;
}

.specimen-meta p {
  color: #d4dbe3;
  margin: 0 0 0.8rem;
}

.specimen-hint {
  font-size: 0.9rem;
  color: var(--muted);
}

.specimen-hint code {
  background: var(--bg-soft);
  padding: 0.15rem 0.45rem;
  border-radius: 6px;
  font-size: 0.85rem;
}

.specimen-link {
  display: inline-block;
  margin-top: 0.6rem;
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.specimen-link:hover {
  text-decoration: underline;
}

.collection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.4rem;
  margin-bottom: 1rem;
}

.collection-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 4px solid var(--accent);
  border-radius: 16px;
  padding: 0 0 1.4rem;
  overflow: hidden;
}

.collection-card__media {
  margin-bottom: 1rem;
}

.collection-card__tabs {
  display: flex;
  gap: 0.35rem;
  padding: 0.75rem 0.85rem 0;
}

.collection-card__tab {
  flex: 1;
  border: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--muted);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.4rem 0.65rem;
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.collection-card__tab.is-active {
  color: var(--text);
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.06);
}

.collection-card__tab.is-disabled,
.collection-card__tab:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.collection-card__photo-view .collection-card__photo,
.collection-card__photo-view .collection-card__photo--fallback {
  margin-bottom: 0;
}

.collection-card__3d-frame {
  position: relative;
  min-height: 280px;
  height: 280px;
  background: #c5cdd6;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.collection-card__3d-host {
  position: absolute;
  inset: 0;
  touch-action: none;
}

.collection-card__3d-host canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.collection-card.is-3d-ready .collection-card__3d-status {
  opacity: 0;
  visibility: hidden;
}

.collection-card__3d-status {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid #9ca8b4;
  color: #374151;
  font-size: 0.82rem;
  z-index: 2;
  pointer-events: none;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.collection-card__3d-status.hidden {
  display: none;
}

.collection-card__3d-hint {
  position: absolute;
  bottom: 0.65rem;
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #d1d5db;
  color: #4b5563;
  font-size: 0.75rem;
  z-index: 2;
  pointer-events: none;
}

.collection-card__3d-link,
.collection-card__3d-missing {
  display: block;
  margin: 0.75rem 1.4rem 0;
  font-size: 0.85rem;
}

.collection-card__3d-link {
  color: var(--accent);
  text-decoration: none;
}

.collection-card__3d-link:hover {
  text-decoration: underline;
}

.collection-card__3d-missing {
  color: var(--muted);
  line-height: 1.5;
}

.panel__3d-btn {
  display: inline-flex;
  margin: 0 0 1rem;
  background: var(--bg-soft);
  border: 1px solid var(--accent);
  color: var(--text);
  font: inherit;
  font-size: 0.88rem;
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}

.panel__3d-btn:hover {
  background: rgba(255, 255, 255, 0.06);
}

.collection-card__photo--empty,
.panel__cover--empty {
  min-height: 140px;
  background: #121820;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
}

.collection-card__photo--empty span,
.panel__cover--empty span {
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.collection-card__photo {
  width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
  margin-bottom: 1rem;
  background: #121820;
  padding: 0.75rem 0.85rem;
  box-sizing: border-box;
}

.collection-card__photo--fallback {
  height: 190px;
  margin-bottom: 1rem;
  padding: 0;
}

.collection-card h3,
.collection-card__sub,
.collection-card__summary,
.collection-card__btn {
  margin-left: 1.4rem;
  margin-right: 1.4rem;
}

.collection-card h3 {
  font-size: 1.25rem;
}

.collection-card__sub {
  color: var(--muted);
  margin: 0.1rem 0 0.8rem;
  font-size: 0.9rem;
}

.collection-card__summary {
  color: #c5cdd6;
  font-size: 0.9rem;
  line-height: 1.55;
  margin: 0 0 1rem;
}

.collection-card__btn {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  color: var(--text);
  font: inherit;
  font-size: 0.88rem;
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.collection-card__btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- About ---------- */
.about-section {
  margin: 1rem 0 3rem;
}

.about-card {
  background: linear-gradient(135deg, #16202e, #15281f);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 2.4rem;
  max-width: 48rem;
  margin: 0 auto;
}

.about-card h2 {
  margin-bottom: 0.8rem;
}

.about-card p {
  color: #d4dbe3;
}

.about-stats {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  margin-top: 1.4rem;
}

.about-stats span {
  color: var(--muted);
}

.about-stats strong {
  display: block;
  font-family: "Fraunces", serif;
  font-size: 1.8rem;
  color: var(--text);
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  text-align: center;
  padding: 2rem 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---------- Map markers ---------- */
.peak-marker {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none !important;
  border: none !important;
}

.peak-marker__pin {
  font-size: 1.5rem;
  color: var(--accent);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
  transition: transform 0.2s;
}

.peak-marker__label {
  background: rgba(14, 17, 22, 0.85);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 999px;
  white-space: nowrap;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.peak-marker--active .peak-marker__pin {
  transform: scale(1.5) translateY(-2px);
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .map-layout,
  .specimen-layout {
    grid-template-columns: 1fr;
  }
  .map {
    min-height: 420px;
  }
  .panel {
    max-height: none;
  }
  .nav__links {
    gap: 0.9rem;
    font-size: 0.85rem;
  }
  .nav__links a:nth-child(n+3):not(:last-child) {
    display: none;
  }
}