/* ============================================================
   陈思远个人主页 · 侦探线索板（v3：单页结构 + 多层案卷面板）
   配色：深棕木板 + 米黄便签 + 红线 #c0392b
   ============================================================ */

:root {
  --red: #c0392b;
  --paper: #f5ead0;
  --paper-warm: #fbf3dd;
  --ink: #2e2620;
  --ink-soft: #5b4f44;
  --bg: #17110c;
  --board-dark: #3a2718;
  --board-light: #4d3520;
  --nav-bg: rgba(23, 17, 12, 0.55);
  --nav-bg-scrolled: rgba(23, 17, 12, 0.88);
  --shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
  --shadow-hover: 0 14px 34px rgba(0, 0, 0, 0.6);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC",
    "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: #e8ddc9;
  line-height: 1.7;
  overflow-x: hidden;
}
body.no-scroll { overflow: hidden; }

section, header, main { scroll-margin-top: 72px; }

/* ---------- Three.js 氛围层 ---------- */
#bg3d {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

#topnav, .hero, .board-wrap, .life, footer { position: relative; z-index: 1; }

/* ---------- 顶部导航条 ---------- */
#topnav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(245, 234, 208, 0.08);
  transition: background 0.35s ease;
}
#topnav.scrolled { background: var(--nav-bg-scrolled); }

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-name {
  color: var(--paper);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}
.nav-name span { color: #8d7f68; font-weight: 400; font-size: 0.85rem; }

.nav-links { display: flex; gap: 26px; list-style: none; }
.nav-links a {
  color: #cdbfa6;
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 0.25s;
}
.nav-links a:hover { color: var(--red); }

/* ---------- Hero 区 ---------- */
.hero {
  min-height: 76vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 60px;
}

.hero-case {
  font-family: "Courier New", monospace;
  color: var(--red);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  margin-bottom: 18px;
}

.hero h1 {
  font-size: clamp(3rem, 8vw, 5.2rem);
  letter-spacing: 0.18em;
  color: var(--paper);
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.7);
}

.hero-sub {
  margin-top: 14px;
  font-size: clamp(1rem, 2.4vw, 1.3rem);
  color: #d8c9a8;
  letter-spacing: 0.12em;
  font-weight: 600;
}

.hero-bio { margin-top: 20px; color: #b8ab92; font-size: 0.98rem; }

.hero-btns { margin-top: 34px; display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; align-items: center; }

.btn {
  display: inline-block;
  padding: 10px 26px;
  border: 1px solid rgba(245, 234, 208, 0.35);
  border-radius: 4px;
  color: var(--paper);
  text-decoration: none;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  transition: all 0.25s ease;
  background: rgba(245, 234, 208, 0.04);
}
.btn:hover {
  border-color: var(--red);
  color: #fff;
  background: rgba(192, 57, 43, 0.18);
  transform: translateY(-2px);
}

/* ---------- 板块标题 ---------- */
.section-title {
  text-align: center;
  font-size: clamp(1.5rem, 3.5vw, 2.1rem);
  color: var(--paper);
  letter-spacing: 0.1em;
}
.section-hint {
  text-align: center;
  color: #8d7f68;
  font-size: 0.88rem;
  margin-top: 8px;
}

/* ---------- 线索板 ---------- */
.board-wrap { padding: 70px 24px 90px; }

.board {
  position: relative;
  max-width: 1200px;
  height: 1440px;
  margin: 40px auto 0;
  border-radius: 10px;
  border: 10px solid #2a1c10;
  box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.55), var(--shadow);
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.06 0'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E"),
    repeating-linear-gradient(90deg,
      rgba(0, 0, 0, 0.08) 0 2px, transparent 2px 90px),
    linear-gradient(135deg, var(--board-light), var(--board-dark) 60%, #33220f);
}

#threads {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: visible;
}

.thread {
  fill: none;
  stroke: var(--red);
  stroke-width: 2;
  opacity: 0.75;
  filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.5));
  transition: opacity 0.25s, stroke-width 0.25s;
}
.thread.active { opacity: 1; stroke-width: 3.5; }
.thread-knot { fill: var(--red); }

/* ---------- 卡片 ---------- */
.card {
  position: absolute;
  background: linear-gradient(160deg, var(--paper-warm), var(--paper));
  color: var(--ink);
  padding: 30px 20px 18px;
  border-radius: 3px;
  box-shadow: var(--shadow);
  transform: rotate(var(--rot, 0deg));
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  cursor: grab;
  user-select: none;
  touch-action: none;
}
.card:hover {
  transform: rotate(0deg) scale(1.04);
  box-shadow: var(--shadow-hover);
  z-index: 20;
}
.card.dragging {
  cursor: grabbing;
  transform: rotate(0deg) scale(1.05);
  box-shadow: var(--shadow-hover);
  z-index: 30;
  transition: none;
}

/* 图钉 */
.pin {
  position: absolute;
  top: -11px;
  left: 50%;
  margin-left: -11px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #e74c3c, var(--red) 55%, #7b1f14);
  box-shadow: 0 3px 5px rgba(0, 0, 0, 0.55);
  transform-origin: 50% 90%;
}
.pin::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 5px;
  height: 5px;
  margin: -2.5px 0 0 -2.5px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
}
.card.dragging .pin { animation: pin-wobble 0.45s ease-in-out infinite; }
@keyframes pin-wobble {
  0%, 100% { transform: rotate(-8deg); }
  50% { transform: rotate(8deg); }
}

/* 旋转手柄 */
.rot-handle {
  position: absolute;
  bottom: -10px;
  left: 50%;
  margin-left: -10px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #8a7a5f, #5b4f44 60%, #33291d);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
  cursor: crosshair;
  opacity: 0;
  transition: opacity 0.2s;
}
.card:hover .rot-handle { opacity: 1; }

.card-tag {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: #fff;
  background: var(--red);
  padding: 2px 8px;
  border-radius: 2px;
  margin-bottom: 8px;
}
.card-intern .card-tag { background: #7d5a2a; }
.card-honor .card-tag { background: #8a6d1f; }
.card-contact .card-tag { background: #444; }

.card h3 { font-size: 1.15rem; margin-bottom: 4px; letter-spacing: 0.03em; }

.card-lede {
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-bottom: 8px;
  font-style: italic;
}

.card ul { list-style: none; font-size: 0.85rem; }
.card ul li { padding: 3px 0 3px 16px; position: relative; }
.card ul li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--red);
  font-weight: 700;
}
.card strong { color: var(--red); }

.card-photo {
  width: 100%;
  border: 5px solid #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  margin: 6px 0 10px;
  transform: rotate(-1deg);
  pointer-events: none;
}

/* 科研卡上的证物缩略图：像钉在板上的照片 */
.card-thumb {
  width: 100%;
  height: 84px;
  object-fit: cover;
  object-position: top center;
  border: 4px solid #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  margin: 6px 0 8px;
  transform: rotate(0.8deg);
  pointer-events: none;
}

.card-more {
  margin-top: 10px;
  font-size: 0.75rem;
  color: var(--red);
  letter-spacing: 0.05em;
  opacity: 0.8;
}

.contact-list a, .card a { color: var(--red); text-decoration: none; }
.card a:hover { text-decoration: underline; }

/* ---------- 生活切片区 ---------- */
.life { padding: 80px 24px 90px; }

.polaroid-grid {
  max-width: 1100px;
  margin: 44px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  justify-content: center;
}

.polaroid {
  width: 190px;
  background: #fdfaf2;
  padding: 12px 12px 14px;
  box-shadow: var(--shadow);
  transform: rotate(var(--rot, 0deg));
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  cursor: pointer;
}
.polaroid:hover {
  animation: polaroid-float 1.6s ease-in-out infinite;
  box-shadow: var(--shadow-hover);
}
@keyframes polaroid-float {
  0%, 100% { transform: rotate(0deg) translateY(0) scale(1.04); }
  50% { transform: rotate(1.2deg) translateY(-6px) scale(1.04); }
}

.polaroid-img {
  height: 150px;
  background: linear-gradient(145deg, #9a9186, #7d746a);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.6rem;
  filter: saturate(0.6);
}
/* 拍立得换上真实照片时 */
.polaroid-photo {
  width: 100%;
  height: 150px;
  object-fit: cover;
  display: block;
}

.polaroid figcaption {
  margin-top: 10px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

/* ---------- 案卷详情面板 ---------- */
#dossier-backdrop {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(10, 7, 5, 0.62);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
#dossier-backdrop.open { opacity: 1; pointer-events: auto; }

#dossier-panel {
  position: relative;
  width: min(640px, 100%);
  max-height: min(80vh, 760px);
  overflow-y: auto;
  background:
    linear-gradient(165deg, var(--paper-warm), var(--paper) 70%, #efe2c2);
  color: var(--ink);
  border-radius: 4px;
  padding: 44px 34px 30px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.7);
  transform: scale(0.92) translateY(14px);
  opacity: 0;
  transition: transform 0.32s cubic-bezier(0.2, 0.9, 0.3, 1.15), opacity 0.28s ease;
}
#dossier-backdrop.open #dossier-panel { transform: none; opacity: 1; }

/* 层级切换淡入 */
#dossier-panel.layer-in .dossier-body,
#dossier-panel.layer-in .dossier-title,
#dossier-panel.layer-in .dossier-chips {
  animation: layer-in 0.28s ease;
}
@keyframes layer-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* 红色「案卷」印戳 */
.dossier-stamp {
  position: absolute;
  top: 16px;
  right: 56px;
  padding: 3px 12px;
  border: 2.5px solid var(--red);
  border-radius: 3px;
  color: var(--red);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.35em;
  text-indent: 0.35em;
  transform: rotate(7deg);
  opacity: 0.75;
  pointer-events: none;
  font-family: "Courier New", monospace;
}

.dossier-crumbs {
  font-family: "Courier New", monospace;
  font-size: 0.78rem;
  color: #8d7f68;
  letter-spacing: 0.05em;
  margin-bottom: 14px;
}
.dossier-crumbs i { font-style: normal; margin: 0 7px; color: var(--red); }
.dossier-crumbs span:last-child { color: var(--ink-soft); }

.dossier-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 34px;
  height: 34px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--ink-soft);
  font-size: 1.4rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.dossier-close:hover { background: rgba(192, 57, 43, 0.12); color: var(--red); }

.dossier-back {
  margin: 0 0 12px;
  padding: 5px 14px;
  border: 1px solid rgba(46, 38, 32, 0.3);
  border-radius: 3px;
  background: transparent;
  color: var(--ink-soft);
  font-size: 0.8rem;
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.dossier-back:hover { border-color: var(--red); color: var(--red); }

.dossier-title { font-size: 1.5rem; letter-spacing: 0.04em; }
.dossier-subtitle {
  font-size: 0.85rem;
  color: var(--red);
  margin: 4px 0 16px;
  letter-spacing: 0.04em;
}

.dossier-body { font-size: 0.94rem; }
.dossier-body p { margin-bottom: 12px; }
.dossier-body ul { list-style: none; margin-bottom: 12px; }
.dossier-body ul li { padding: 4px 0 4px 18px; position: relative; }
.dossier-body ul li::before {
  content: "▸";
  position: absolute;
  left: 2px;
  color: var(--red);
}
.dossier-body strong { color: var(--red); }
.dossier-body a { color: var(--red); }
.dossier-body code {
  background: rgba(46, 38, 32, 0.08);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 0.85em;
}

/* 面板内大图占位 */
.dossier-img-ph {
  height: 220px;
  background: linear-gradient(145deg, #9a9186, #746b60);
  color: #e8ddc9;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 1.1rem;
  letter-spacing: 0.15em;
  border-radius: 3px;
  margin-bottom: 16px;
}

/* 城市案卷的照片占位网格 */
.dossier-img-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 12px 0 16px;
}
.dossier-img-ph.small {
  height: 110px;
  font-size: 0.72rem;
  margin-bottom: 0;
}
/* 网格内的真实照片：统一比例，可点击放大 */
.dossier-img-grid img {
  width: 100%;
  height: 110px;
  object-fit: cover;
  border-radius: 3px;
  cursor: zoom-in;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: block;
}
.dossier-img-grid img:hover {
  transform: scale(1.04);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}
.dossier-img-grid.two { grid-template-columns: 1fr 1fr; }
.dossier-img-grid.two img { height: 220px; }

/* ---------- Lightbox 大图查看 ---------- */
#lightbox {
  position: fixed;
  inset: 0;
  z-index: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 14px;
  background: rgba(8, 5, 3, 0.9);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  cursor: zoom-out;
}
#lightbox.open { opacity: 1; pointer-events: auto; }
#lightbox img {
  max-width: 92vw;
  max-height: 84vh;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7);
  transform: scale(0.96);
  transition: transform 0.25s ease;
}
#lightbox.open img { transform: none; }
.lightbox-hint {
  color: #8d7f68;
  font-size: 0.75rem;
  font-family: "Courier New", monospace;
  letter-spacing: 0.1em;
}

/* ---------- 生活切片：模块布局 ---------- */
.life-modules {
  max-width: 1200px;
  margin: 60px auto 0;
  display: flex;
  gap: 40px;
  align-items: flex-start;
  flex-wrap: wrap;
}
.module-map { flex: 1 1 620px; min-width: 0; }

.module-title {
  font-size: 1.15rem;
  color: var(--paper);
  letter-spacing: 0.12em;
  margin-bottom: 4px;
}
.module-hint { font-size: 0.8rem; color: #8d7f68; margin-bottom: 16px; }

/* 锚点拍立得（旅行/音乐 → 滚动到新模块） */
.polaroid-link {
  display: block;
  text-decoration: none;
}
.polaroid-link figcaption { color: var(--red); }

/* ---------- 旅行线索地图 ---------- */
.map-frame {
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E"),
    radial-gradient(ellipse at 45% 40%, #3b2c1c, #241a10 75%);
  border: 8px solid #2a1c10;
  border-radius: 8px;
  box-shadow: var(--shadow), inset 0 0 50px rgba(0, 0, 0, 0.5);
  padding: 10px;
}
.map-scroll { overflow-x: auto; }

.clue-map { display: block; width: 100%; height: auto; min-width: 560px; }

.map-province {
  fill: rgba(245, 234, 208, 0.055);
  stroke: rgba(245, 234, 208, 0.28);
  stroke-width: 0.7;
}
.map-province:hover { fill: rgba(245, 234, 208, 0.09); }

.route-line {
  fill: none;
  stroke: var(--red);
  stroke-width: 2;
  stroke-dasharray: 7 6;
  opacity: 0.85;
  animation: route-flow 1.1s linear infinite;
}
@keyframes route-flow { to { stroke-dashoffset: -13; } }

.map-pin { cursor: pointer; outline: none; }
.map-pin .pin-needle { fill: #7b1f14; }
.map-pin .pin-head {
  fill: var(--red);
  stroke: rgba(0, 0, 0, 0.4);
  stroke-width: 1;
  filter: drop-shadow(0 2px 2px rgba(0, 0, 0, 0.6));
  transition: r 0.2s;
}
.map-pin:hover .pin-head, .map-pin:focus-visible .pin-head { r: 9.5; }
.map-pin .pin-dot { fill: rgba(255, 255, 255, 0.55); pointer-events: none; }
.pin-label {
  fill: #e8ddc9;
  font-size: 14px;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  paint-order: stroke;
  stroke: rgba(20, 12, 6, 0.85);
  stroke-width: 3px;
  pointer-events: none;
}

.map-fallback { color: #8d7f68; text-align: center; padding: 40px 0; }

/* 黑胶旋转动画（背景音乐按钮的迷你黑胶图标使用） */
@keyframes vinyl-spin { to { transform: rotate(360deg); } }

/* ---------- 移动端补充 ---------- */
@media (max-width: 767px) {
  .life-modules { flex-direction: column; }
  .module-map { flex: 1 1 auto; width: 100%; min-width: 0; }
  .dossier-img-grid { grid-template-columns: 1fr 1fr; }
}

/* 面板内图片（框架图 / 证物照片） */
.dossier-fig {
  width: 100%;
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(46, 38, 32, 0.12);
  margin: 6px 0 2px;
  display: block;
}
.fig-cap {
  font-size: 0.75rem;
  color: #8d7f68;
  font-family: "Courier New", monospace;
  margin: 4px 0 14px;
  letter-spacing: 0.04em;
}

/* Research Questions 区块：档案笔录 styling */
.rq-block {
  background: rgba(192, 57, 43, 0.05);
  border: 1px dashed rgba(192, 57, 43, 0.5);
  border-radius: 4px;
  padding: 14px 16px 10px;
  margin: 14px 0 16px;
}
.rq-title {
  font-family: "Courier New", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--red);
  font-weight: 700;
  margin-bottom: 8px;
}
.rq-block ol { list-style: none; }
.rq-block ol li {
  padding: 5px 0 5px 0;
  font-size: 0.88rem;
  border-top: 1px dotted rgba(46, 38, 32, 0.15);
}
.rq-block ol li:first-child { border-top: none; }
.rq-block ol li strong {
  font-family: "Courier New", monospace;
  margin-right: 8px;
}

/* 深入线索 chips */
.dossier-chips { margin-top: 20px; }
.chips-hint {
  font-size: 0.78rem;
  color: #8d7f68;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.chip {
  display: inline-block;
  margin: 0 8px 8px 0;
  padding: 7px 16px;
  border: 1.5px solid var(--red);
  border-radius: 3px;
  background: transparent;
  color: var(--red);
  font-size: 0.85rem;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.2s;
}
.chip:hover {
  background: var(--red);
  color: #fff;
  transform: translateY(-2px);
}

/* ---------- 背景音乐开关（右下角浮动） ---------- */
#bgm-toggle {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 150;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px 9px 10px;
  border: 1px solid rgba(245, 234, 208, 0.18);
  border-radius: 999px;
  background:
    linear-gradient(160deg, rgba(58, 44, 26, 0.92), rgba(36, 23, 8, 0.92));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #cdbfa6;
  font-size: 0.82rem;
  font-family: inherit;
  letter-spacing: 0.08em;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.5);
  transition: border-color 0.25s, color 0.25s;
}
#bgm-toggle:hover { border-color: var(--red); color: var(--paper); }

/* 迷你黑胶图标 */
.bgm-disc {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: repeating-radial-gradient(circle, #14100c 0 2px, #241b12 2px 4px);
  border: 2px solid #0d0a07;
  color: var(--red);
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
#bgm-toggle.on .bgm-disc { animation: vinyl-spin 2.8s linear infinite; }

/* 播放中：脉动光圈 */
#bgm-toggle.on {
  border-color: var(--red);
  color: var(--paper);
  animation: bgm-pulse 2.4s ease-in-out infinite;
}
@keyframes bgm-pulse {
  0%, 100% { box-shadow: 0 4px 14px rgba(0, 0, 0, 0.5), 0 0 0 0 rgba(192, 57, 43, 0.35); }
  50% { box-shadow: 0 4px 14px rgba(0, 0, 0, 0.5), 0 0 0 9px rgba(192, 57, 43, 0); }
}

/* ---------- 页脚 ---------- */
footer {
  text-align: center;
  padding: 34px 20px 40px;
  color: #776a56;
  font-size: 0.85rem;
  border-top: 1px solid rgba(245, 234, 208, 0.07);
}

/* ---------- 移动端：纵向流式 ---------- */
@media (max-width: 767px) {
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 0.85rem; }
  .br-wide { display: none; }

  .board {
    height: auto;
    border-width: 6px;
    padding: 26px 16px;
    display: flex;
    flex-direction: column;
    gap: 26px;
    align-items: center;
  }

  #threads, .rot-handle { display: none; }

  .card {
    position: static;
    width: 100% !important;
    max-width: 420px;
    cursor: pointer;
    user-select: auto;
    touch-action: auto;
  }
  .card:hover {
    transform: rotate(var(--rot, 0deg));
    box-shadow: var(--shadow);
  }

  /* 面板占满屏 */
  #dossier-backdrop { padding: 0; }
  #dossier-panel {
    width: 100%;
    max-height: 100vh;
    height: 100vh;
    border-radius: 0;
    padding: 40px 22px 26px;
  }
}