:root {
  --bg: #0a0a0c;
  --ink: #f3eee6;
  --ink-dim: rgba(243, 238, 230, 0.62);
  --ink-faint: rgba(243, 238, 230, 0.38);
  --glass: rgba(18, 17, 20, 0.62);
  --glass-strong: rgba(16, 15, 18, 0.9);
  --line: rgba(243, 238, 230, 0.14);
  --accent: #f3eee6;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --panel-w: 400px;
  --gutter: 20px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

#scene {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  display: block;
  touch-action: none;
  outline: none;
}
#scene.is-pointer { cursor: pointer; }
#scene.is-grabbing { cursor: grabbing; }

button { font: inherit; color: inherit; }

.dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c, #fff);
  box-shadow: 0 0 10px var(--c, #fff);
  flex: none;
}

/* ---------- brand ---------- */
.brand {
  position: fixed;
  top: calc(var(--gutter) + env(safe-area-inset-top));
  left: calc(var(--gutter) + env(safe-area-inset-left));
  pointer-events: none;
  z-index: 5;
}
.brand h1 {
  margin: 0;
  text-shadow: 0 1px 12px rgba(0,0,0,0.7), 0 0 2px rgba(0,0,0,0.6);
  font-family: var(--serif);
  font-weight: 400;
  font-size: 26px;
  letter-spacing: 0.01em;
  line-height: 1.1;
}
.brand p {
  margin: 6px 0 0;
  text-shadow: 0 1px 8px rgba(0,0,0,0.8);
  font-size: 13px;
  color: var(--ink-dim);
  letter-spacing: 0.02em;
}

/* ---------- pills / buttons ---------- */
.top-actions {
  position: fixed;
  top: calc(var(--gutter) + env(safe-area-inset-top));
  right: calc(var(--gutter) + env(safe-area-inset-right));
  display: flex;
  gap: 8px;
  z-index: 6;
  transition: right 0.45s cubic-bezier(.2,.7,.2,1);
}
body.detail-open .top-actions { right: calc(var(--panel-w) + var(--gutter)); }

/* 返回首页：悬浮在左上角，不与右上角的操作按钮冲突 */
.back-home {
  position: fixed;
  top: calc(var(--gutter) + env(safe-area-inset-top));
  left: calc(var(--gutter) + env(safe-area-inset-left));
  z-index: 6;
  padding: 7px 13px;
  border-radius: 999px;
  background: #1c1b1fcc;
  border: 1px solid #ffffff22;
  color: #f3eee6cc;
  text-decoration: none;
  font-size: 13.5px;
  backdrop-filter: blur(4px);
  transition: color 0.2s, background 0.2s;
}
.back-home:hover { color: #fff; background: #2a2830; }
body.detail-open .back-home { pointer-events: none; opacity: 0; }

.pill {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-radius: 999px;
  padding: 8px 15px;
  font-size: 13px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, opacity 0.2s;
}
.pill:hover { background: rgba(40, 38, 44, 0.8); border-color: rgba(243,238,230,0.3); }
.pill:focus-visible, .chip:focus-visible, .icon-btn:focus-visible, .thumb:focus-visible, a:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}
.pill[disabled] { opacity: 0.35; cursor: default; }

.icon-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--glass);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
}

/* ---------- story chips ---------- */
.chips {
  position: fixed;
  left: 50%;
  bottom: calc(var(--gutter) + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  padding: 6px;
  border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  z-index: 5;
  max-width: calc(100vw - 2 * var(--gutter));
  overflow-x: auto;
  scrollbar-width: none;
  transition: transform 0.45s cubic-bezier(.2,.7,.2,1), left 0.45s cubic-bezier(.2,.7,.2,1);
}
.chips::-webkit-scrollbar { display: none; }
body.detail-open .chips { left: calc((100vw - var(--panel-w)) / 2); max-width: calc(100vw - var(--panel-w) - 2 * var(--gutter)); }

.chip {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  border-radius: 999px;
  padding: 7px 13px 7px 11px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  white-space: nowrap;
  cursor: pointer;
  color: var(--ink-dim);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.chip:hover { color: var(--ink); background: rgba(255,255,255,0.06); }
.chip[aria-pressed="true"] {
  color: var(--ink);
  background: rgba(255,255,255,0.1);
  border-color: color-mix(in srgb, var(--c) 60%, transparent);
}
.chip .count { color: var(--ink-faint); font-variant-numeric: tabular-nums; }

/* ---------- hint ---------- */
.hint {
  position: fixed;
  right: calc(var(--gutter) + env(safe-area-inset-right));
  bottom: calc(var(--gutter) + 72px + env(safe-area-inset-bottom));
  margin: 0;
  font-size: 12px;
  color: var(--ink-faint);
  pointer-events: none;
  z-index: 4;
  transition: opacity 0.6s;
  text-align: right;
}
.hint.is-hidden { opacity: 0; }

/* ---------- story card ---------- */
.story-card {
  position: fixed;
  left: calc(var(--gutter) + env(safe-area-inset-left));
  bottom: calc(var(--gutter) + 70px + env(safe-area-inset-bottom));
  width: min(360px, calc(100vw - 2 * var(--gutter)));
  padding: 14px 14px 12px;
  border-radius: 16px;
  background: var(--glass);
  border: 1px solid var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  z-index: 5;
  animation: rise 0.4s cubic-bezier(.2,.7,.2,1);
}
.story-card[hidden] { display: none; }
.story-card-head { display: flex; gap: 10px; align-items: flex-start; }
.story-card-head .dot { margin-top: 8px; }
.story-card h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 20px;
}
.story-card p { margin: 4px 0 0; font-size: 13px; line-height: 1.45; color: var(--ink-dim); }

.strip {
  display: flex;
  gap: 6px;
  margin-top: 12px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: thin;
}
.thumb {
  appearance: none;
  flex: none;
  width: 58px;
  height: 42px;
  padding: 0;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: #111 center / cover no-repeat;
  cursor: pointer;
  opacity: 0.85;
  transition: opacity 0.2s, transform 0.2s;
}
.thumb:hover, .thumb[aria-current="true"] { opacity: 1; transform: translateY(-2px); border-color: var(--c, #fff); }

/* ---------- tooltip ---------- */
.tooltip {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 8;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 9px 12px 10px;
  max-width: 260px;
  border-radius: 12px;
  background: var(--glass-strong);
  border: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-dim);
  transform: translate(-9999px, -9999px);
}
.tooltip[hidden] { display: none; }
.tooltip .tt-story { display: inline-flex; align-items: center; gap: 6px; font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; }
.tooltip .dot { width: 7px; height: 7px; }
.tooltip strong { color: var(--ink); font-family: var(--serif); font-weight: 400; font-size: 16px; }

/* ---------- detail panel ---------- */
.detail {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: var(--panel-w);
  z-index: 7;
  background: linear-gradient(180deg, rgba(14,13,16,0.94), rgba(10,10,12,0.97));
  border-left: 1px solid var(--line);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  transform: translateX(105%);
  transition: transform 0.5s cubic-bezier(.2,.7,.2,1);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  outline: none;
}
body.detail-open .detail { transform: none; }

.detail .close { position: absolute; top: 14px; right: 14px; z-index: 2; }
.d-figure {
  margin: 0;
  padding: 64px 22px 0;
}
.d-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 52vh;
  object-fit: contain;
  border-radius: 4px;
  background: #151417;
  box-shadow: 0 18px 50px rgba(0,0,0,0.55), 0 0 0 1px rgba(255,255,255,0.06);
}
.d-body { padding: 18px 22px 28px; }
.d-story {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.d-count { margin-left: auto; color: var(--ink-faint); letter-spacing: 0.04em; font-variant-numeric: tabular-nums; }
.d-body h2 {
  margin: 10px 0 4px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 30px;
  line-height: 1.15;
}
.d-meta { margin: 0; color: var(--ink-dim); font-size: 14px; }
.d-links { margin: 14px 0 0; font-size: 13px; }
.d-links a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--ink-faint); padding-bottom: 1px; }
.d-links a:hover { border-color: var(--ink); }
.d-nav { display: flex; gap: 8px; margin-top: 22px; }
.d-nav .pill { flex: 1; }
.d-keys { margin: 14px 0 0; font-size: 12px; color: var(--ink-faint); }
.d-more { margin-top: 24px; }
.d-more-label { margin: 0; font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-faint); }
.d-more .strip { flex-wrap: wrap; overflow: visible; }
.d-more .thumb { width: 64px; height: 44px; }

/* soft scrim so the title stays legible over the bright canopy */
body::before {
  content: "";
  position: fixed;
  left: 0; right: 0; top: 0;
  height: 130px;
  background: linear-gradient(180deg, rgba(6,6,8,0.55), rgba(6,6,8,0));
  pointer-events: none;
  z-index: 4;
}

/* ---------- index ---------- */
.index {
  position: fixed;
  inset: 0;
  z-index: 10;
  background: rgba(8, 8, 10, 0.86);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  overflow-y: auto;
  animation: fade 0.25s ease;
}
.index[hidden] { display: none; }
.index-inner { max-width: 1040px; margin: 0 auto; padding: calc(28px + env(safe-area-inset-top)) var(--gutter) 60px; }
.index-head { display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; }
.index-head h2 { margin: 0; font-family: var(--serif); font-weight: 400; font-size: 28px; }
.index-story { margin-top: 34px; }
.index-story h3 { margin: 0; display: flex; align-items: center; gap: 10px; font-family: var(--serif); font-weight: 400; font-size: 21px; }
.index-story h3 .count { font-family: var(--sans); font-size: 13px; color: var(--ink-faint); }
.index-story > p { margin: 4px 0 14px 19px; color: var(--ink-dim); font-size: 14px; }
.index-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
.index-item {
  appearance: none;
  border: 0;
  padding: 0;
  background: none;
  text-align: left;
  cursor: pointer;
  color: var(--ink);
}
.index-item img { display: block; width: 100%; aspect-ratio: 3 / 2; object-fit: cover; border-radius: 6px; background: #151417; transition: transform 0.25s, filter 0.25s; filter: brightness(0.9); }
.index-item:hover img { transform: translateY(-2px); filter: none; }
.index-item span { display: block; margin-top: 6px; font-size: 13px; color: var(--ink-dim); }

/* ---------- loader ---------- */
.loader {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  background: var(--bg);
  transition: opacity 0.9s ease;
}
.loader.is-done { opacity: 0; pointer-events: none; }
.loader.is-done .loader-umbrella, .is-paused .loader-umbrella { animation-play-state: paused; }
.loader-inner { text-align: center; color: var(--ink-dim); font-size: 13px; letter-spacing: 0.04em; }
.loader-umbrella {
  width: 54px;
  height: 54px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background:
    repeating-conic-gradient(from 0deg, rgba(243,238,230,0.9) 0deg 13deg, rgba(243,238,230,0.55) 13deg 15deg);
  -webkit-mask: radial-gradient(circle, transparent 0 4px, #000 5px);
  mask: radial-gradient(circle, transparent 0 4px, #000 5px);
  animation: spin 6s linear infinite;
  box-shadow: 0 0 40px rgba(243,238,230,0.25);
}

.noscript-msg { position: fixed; inset: 0; display: grid; place-items: center; }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

/* ---------- small screens ---------- */
@media (max-width: 760px) {
  :root { --gutter: 14px; }
  .brand h1 { font-size: 21px; }
  .brand p { font-size: 12px; }
  .pill { padding: 7px 12px; font-size: 12px; }
  .hint { display: none; }
  .chips {
    left: var(--gutter);
    right: var(--gutter);
    transform: none;
    border-radius: 18px;
  }
  body.detail-open .chips { left: var(--gutter); max-width: none; }
  body.detail-open .top-actions { right: calc(var(--gutter) + env(safe-area-inset-right)); }
  .story-card { bottom: calc(var(--gutter) + 64px + env(safe-area-inset-bottom)); left: var(--gutter); right: var(--gutter); width: auto; }

  .detail {
    top: auto;
    left: 0;
    width: 100%;
    height: auto;
    max-height: 62vh;
    max-height: 62dvh;
    border-left: 0;
    border-top: 1px solid var(--line);
    border-radius: 18px 18px 0 0;
    transform: translateY(105%);
  }
  .d-figure { display: none; } /* the hanging photo above the sheet is the picture */
  .detail .close { top: 10px; right: 10px; width: 32px; height: 32px; }
  .d-body { padding: 16px 16px calc(18px + env(safe-area-inset-bottom)); }
  .d-story { padding-right: 44px; }
  .d-more { margin-top: 14px; }
  .d-more-label { display: none; }
  .d-more .strip { flex-wrap: nowrap; overflow-x: auto; }
  .d-more .thumb { width: 54px; height: 38px; }
  .d-body h2 { font-size: 24px; margin-top: 6px; }
  .d-keys { display: none; }
  .d-nav { margin-top: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* Platform edition: let the installation carry the opening view. */
body::before { display: none; }
#tooltip, #story-intro, .index-story > p, .index-item > span,
.d-keys, .d-more-label, #loader-text { display: none !important; }
.top-actions .pill { width: 36px; height: 36px; padding: 0; display: grid; place-items: center; }
.top-actions svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.3; stroke-linecap: round; stroke-linejoin: round; }
#btn-index svg { fill: currentColor; stroke: none; }
.chips { gap: 2px; padding: 4px 8px; }
.chip { width: 30px; height: 30px; padding: 0; justify-content: center; }
.chip .dot { width: 7px; height: 7px; box-shadow: none; }
.story-card { bottom: calc(var(--gutter) + 54px + env(safe-area-inset-bottom)); }
.story-card h2 { font-size: 16px; }
.story-card-head .dot { margin-top: 6px; }
.d-body h2 { font-size: 23px; }
.index-story > h3 .count { display: none; }
.index-grid { margin-top: 16px; }
.loader.is-done { display: none; }
@media (max-width: 760px) {
  .chips, body.detail-open .chips { left: 50%; right: auto; transform: translateX(-50%); border-radius: 999px; }
  .story-card { bottom: calc(var(--gutter) + 54px + env(safe-area-inset-bottom)); }
}