/* ==========================================================================
   北京 · 千年之约 — 样式
   结构：令牌 → 基础 → 全局组件（加载、颗粒、鼠标、顶栏、目录、印章、标题）
         → 各区块（hero / seasons / history / axis / scenes / day / ending）
         → 响应式 / 减少动效
   ========================================================================== */

/* ---------- 令牌 ---------- */
:root {
  --paper: #f4efe6;
  --paper-2: #ebe3d3;
  --paper-3: #e2d8c3;
  --ink: #1a1a1a;
  --ink-2: #3a3632;
  --ink-3: #6b655c;
  --vermilion: #c8322b;
  --vermilion-2: #a3261f;
  --gold: #c9a227;
  --gold-2: #a8861c;
  --jade: #3d7a6a;
  --night: #0b0f1a;
  --night-2: #131a2b;
  --mist: rgba(244, 239, 230, .6);

  --font-brush: "Ma Shan Zheng", "Kaiti SC", "STKaiti", "KaiTi", "BiauKai", "AR PL UKai CN", serif;
  --font-display: "ZCOOL XiaoWei", "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif;
  --font-body: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-latin: "Cormorant Garamond", "Georgia", "Times New Roman", serif;

  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --ease-in-out: cubic-bezier(.65, 0, .35, 1);
  --gutter: clamp(16px, 5vw, 96px);
}

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: auto; -webkit-text-size-adjust: 100%; }
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-smooth [data-lenis-prevent] { overscroll-behavior: contain; }
.lenis.lenis-stopped { overflow: hidden; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: .02em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
body.has-cursor, body.has-cursor a, body.has-cursor button { cursor: none; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
h1, h2, h3, p { margin: 0; }
[hidden] { display: none !important; }
.vertical { writing-mode: vertical-rl; text-orientation: upright; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* 触屏设备不显示自定义鼠标 */
@media (hover: none) {
  #cursor, #cursor-ring { display: none !important; }
}

/* ---------- 宣纸颗粒 ---------- */
.grain {
  position: fixed; inset: 0;
  pointer-events: none; z-index: 60;
  opacity: .28; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='320' height='320'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 .09 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- 加载遮罩 ---------- */
#loader {
  position: fixed; inset: 0; z-index: 100;
  background: var(--paper);
  display: grid; place-items: center;
  overflow: hidden;
}
#loader .loader-ink {
  position: absolute; width: 60vmin; height: 60vmin; border-radius: 50%;
  background: radial-gradient(circle, rgba(26,26,26,.16) 0%, rgba(26,26,26,.06) 40%, rgba(26,26,26,0) 70%);
  filter: blur(8px);
  transform: scale(.2); opacity: 0;
}
#loader .loader-char {
  position: relative;
  font-family: var(--font-brush);
  font-size: clamp(120px, 30vmin, 260px);
  line-height: 1; color: var(--ink);
  clip-path: inset(0 0 100% 0);
}
#loader .loader-line {
  position: absolute; bottom: 14vh; left: 50%; transform: translateX(-50%);
  width: 160px; height: 1px; background: rgba(26,26,26,.15);
}
#loader .loader-line i { display: block; height: 100%; width: 0; background: var(--vermilion); }
#loader .loader-tip {
  position: absolute; bottom: calc(14vh + 14px); left: 50%; transform: translateX(-50%);
  font-size: 12px; letter-spacing: .4em; color: var(--ink-3);
}

/* ---------- 自定义鼠标 ---------- */
#cursor {
  position: fixed; top: 0; left: 0; z-index: 95;
  width: 8px; height: 8px; margin: -4px 0 0 -4px; border-radius: 50%;
  background: var(--vermilion); pointer-events: none;
  will-change: transform;
}
#cursor-ring {
  position: fixed; top: 0; left: 0; z-index: 94;
  width: 36px; height: 36px; margin: -18px 0 0 -18px; border-radius: 50%;
  border: 1px solid rgba(200, 50, 43, .7); pointer-events: none;
  transition: width .35s var(--ease-out), height .35s var(--ease-out), margin .35s var(--ease-out),
              border-radius .35s var(--ease-out), background-color .35s, border-color .35s, rotate .25s;
  will-change: transform;
}
#cursor-ring.is-seal {
  width: 44px; height: 44px; margin: -22px 0 0 -22px; border-radius: 6px;
  background: rgba(200, 50, 43, .18); border-color: var(--vermilion);
  rotate: -8deg;
}
#cursor-ring.is-seal::after {
  content: "印"; position: absolute; inset: 0; display: grid; place-items: center;
  font-family: var(--font-brush); font-size: 18px; color: var(--vermilion);
}
#cursor-ring.is-drag { width: 64px; height: 64px; margin: -32px 0 0 -32px; background: rgba(200,50,43,.08); }
#cursor-ring.is-drag::after {
  content: "⟵ ⟶"; position: absolute; inset: 0; display: grid; place-items: center;
  font-size: 12px; color: var(--vermilion); letter-spacing: .1em;
}
body.on-dark #cursor-ring { border-color: rgba(244,239,230,.6); }

/* ---------- 粒子 ---------- */
#particles { position: fixed; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 50; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 80;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px var(--gutter);
  pointer-events: none;
  color: #fff; mix-blend-mode: difference;
}
.topbar > * { pointer-events: auto; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-seal {
  display: grid; place-items: center; width: 34px; height: 34px;
  font-family: var(--font-brush); font-size: 22px; line-height: 1;
  border: 1.5px solid currentColor; border-radius: 3px; transform: rotate(-6deg);
}
.brand-text { font-family: var(--font-display); font-size: 15px; letter-spacing: .3em; }
.brand-text em { font-style: normal; opacity: .6; }

#bgm-toggle {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 12px; border: 1px solid currentColor; border-radius: 999px;
  font-size: 12px; letter-spacing: .3em;
}
#bgm-toggle:disabled { opacity: .55; cursor: wait; }
#bgm-audio { display: none; }
.bgm-bars { display: flex; align-items: flex-end; gap: 2px; height: 14px; }
.bgm-bars i { width: 2px; height: 4px; background: currentColor; transition: height .3s; }
#bgm-toggle[aria-pressed="true"] .bgm-bars i { animation: bars .9s ease-in-out infinite; }
#bgm-toggle[aria-pressed="true"] .bgm-bars i:nth-child(2) { animation-delay: .15s; }
#bgm-toggle[aria-pressed="true"] .bgm-bars i:nth-child(3) { animation-delay: .3s; }
#bgm-toggle[aria-pressed="true"] .bgm-bars i:nth-child(4) { animation-delay: .45s; }
@keyframes bars { 0%, 100% { height: 4px; } 50% { height: 14px; } }

/* ---------- 卷轴目录 ---------- */
.scroll-nav {
  position: fixed; right: clamp(12px, 2.4vw, 36px); top: 50%; transform: translateY(-50%);
  z-index: 80; display: flex; flex-direction: column; gap: 18px;
  color: #fff; mix-blend-mode: difference;
}
.scroll-nav a {
  position: relative; display: flex; align-items: center; justify-content: flex-end; gap: 10px;
  font-family: var(--font-display); font-size: 12px; letter-spacing: .25em;
  opacity: .55; transition: opacity .3s;
}
.scroll-nav a span { writing-mode: vertical-rl; text-orientation: upright; letter-spacing: .2em; }
.scroll-nav a::after {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  border: 1px solid currentColor; transition: background-color .3s, transform .3s;
}
.scroll-nav a.active { opacity: 1; }
.scroll-nav a.active::after { background: currentColor; transform: scale(1.3); }

/* ---------- 印章 ---------- */
.seal {
  display: inline-grid; place-items: center;
  background: var(--vermilion); color: var(--paper);
  font-family: var(--font-brush); line-height: 1.05; text-align: center;
  border-radius: 4px; transform: rotate(-6deg);
  box-shadow: inset 0 0 0 2px var(--paper), inset 0 0 0 4px var(--vermilion);
  padding: 8px;
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='r'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.08' numOctaves='2' seed='3'/%3E%3CfeColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 -1.4 1.9'/%3E%3C/filter%3E%3Crect width='200' height='200' fill='%23000' filter='url(%23r)'/%3E%3C/svg%3E");
          mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='r'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.08' numOctaves='2' seed='3'/%3E%3CfeColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 -1.4 1.9'/%3E%3C/filter%3E%3Crect width='200' height='200' fill='%23000' filter='url(%23r)'/%3E%3C/svg%3E");
  -webkit-mask-size: cover; mask-size: cover;
}
.seal span { display: block; }
.seal-sm { width: 44px; height: 44px; font-size: 15px; }
.seal-lg { width: 92px; height: 92px; font-size: 26px; }
.seal-xl { width: 128px; height: 128px; font-size: 32px; }

/* ---------- 区块标题 ---------- */
.sec-head { position: relative; }
.sec-head .sec-en {
  display: block; font-family: var(--font-latin); font-size: 13px; letter-spacing: .45em;
  color: var(--gold-2); margin-bottom: 14px;
}
.sec-head h2 {
  font-family: var(--font-display); font-weight: 400;
  font-size: clamp(34px, 5vw, 64px); line-height: 1.15; letter-spacing: .08em;
}
.sec-head .sec-sub { margin-top: 18px; color: var(--ink-3); font-size: 15px; letter-spacing: .1em; }
.sec-head.center { text-align: center; }
.sec-head.center::before {
  content: ""; display: block; width: 1px; height: 56px; margin: 0 auto 26px;
  background: linear-gradient(to bottom, transparent, var(--vermilion));
}
.sec-head.light { color: var(--paper); }
.sec-head.light .sec-en { color: rgba(244,239,230,.7); }

/* 通用进场动效初始态（JS 添加 .in 后播放） */
.reveal { opacity: 0; transform: translateY(40px); transition: opacity 1s var(--ease-out), transform 1s var(--ease-out); }
.reveal.in { opacity: 1; transform: none; }

/* 图片容器：先 sd 后 hd，淡入 */
.pic { position: relative; overflow: hidden; background: var(--paper-3); }
.pic img { width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity .8s; }
.pic img.loaded { opacity: 1; }
.pic .pic-fallback {
  position: absolute; inset: 0; display: grid; place-items: center;
  background: linear-gradient(135deg, #2a2a2a, #111); color: rgba(244,239,230,.6);
  font-family: var(--font-display); letter-spacing: .3em; font-size: 22px;
  opacity: 0; pointer-events: none;
}
.pic.failed .pic-fallback { opacity: 1; }

/* ==========================================================================
   ① 开场卷轴
   ========================================================================== */
.hero { position: relative; height: 200vh; background: var(--paper); }
.hero-stage { position: sticky; top: 0; height: 100vh; overflow: hidden; }
.hero-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center 40%;
  transform: scale(1.06); will-change: transform;
  background-color: #2a2a2a;
}
.hero-bg.image-failed {
  background-image: linear-gradient(145deg, #5e6565, #2a3437 55%, #101720) !important;
}
.hero-dim {
  position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background: var(--night); opacity: 0;
}
.hero-wash {
  position: absolute; inset: 0; z-index: 2;
  background:
    radial-gradient(120% 80% at 50% 50%, transparent 40%, rgba(244,239,230,.45) 100%),
    linear-gradient(to bottom, rgba(244,239,230,.35), transparent 30%, transparent 70%, rgba(244,239,230,.5));
  mix-blend-mode: normal;
}
.hero-vignette {
  position: absolute; inset: 0; z-index: 2;
  background: radial-gradient(90% 90% at 50% 45%, transparent 55%, rgba(26,26,26,.45) 100%);
}
.mist {
  position: absolute; z-index: 2; width: 90vw; height: 60vh; border-radius: 50%;
  background: radial-gradient(closest-side, rgba(244,239,230,.55), rgba(244,239,230,0));
  filter: blur(18px); opacity: 0; will-change: transform;
}
.mist-1 { left: -20vw; bottom: -20vh; animation: mist1 26s ease-in-out infinite alternate; }
.mist-2 { right: -30vw; top: -10vh; width: 70vw; animation: mist2 32s ease-in-out infinite alternate; }
@keyframes mist1 { from { translate: 0 0; } to { translate: 12vw -6vh; } }
@keyframes mist2 { from { translate: 0 0; } to { translate: -14vw 8vh; } }

.hero-content { position: absolute; inset: 0; z-index: 3; pointer-events: none; }
.hero-title {
  position: absolute; right: clamp(56px, 10vw, 160px); top: 50%; transform: translateY(-52%);
  writing-mode: horizontal-tb; display: flex; flex-direction: column; align-items: center; gap: .04em;
  font-family: var(--font-brush); font-weight: 400;
  font-size: clamp(120px, 22vh, 220px); line-height: 1; 
  color: var(--paper);
  text-shadow: 0 2px 0 rgba(26,26,26,.25), 0 10px 40px rgba(0,0,0,.45);
}
.hero-char { display: block; opacity: 0; transform: translateY(30px); filter: blur(6px); }
.hero-seal {
  position: absolute; right: clamp(40px, 8vw, 130px); bottom: 20vh;
  opacity: 0; transform: rotate(-6deg) scale(1.8);
}
.hero-sub {
  position: absolute; left: clamp(48px, 9vw, 150px); top: 50%; transform: translateY(-50%);
  font-family: var(--font-display); font-size: clamp(16px, 2vh, 22px); letter-spacing: .5em;
  color: var(--paper); text-shadow: 0 2px 20px rgba(0,0,0,.5);
  opacity: 0;
}
.hero-en {
  position: absolute; left: clamp(48px, 9vw, 150px); bottom: 14vh;
  font-family: var(--font-latin); font-size: 12px; letter-spacing: .45em;
  color: rgba(244,239,230,.85); opacity: 0;
}

/* 卷轴：上下锦缎、左右纸盖、轴头 */
.hero-band {
  position: absolute; left: 0; right: 0; height: 22px; z-index: 5;
  background:
    repeating-linear-gradient(90deg, rgba(201,162,39,.35) 0 2px, transparent 2px 14px),
    linear-gradient(to bottom, #7a1f1a, #a3261f 50%, #7a1f1a);
  box-shadow: 0 0 12px rgba(0,0,0,.35);
}
.hero-band.top { top: 0; }
.hero-band.bottom { bottom: 0; }
.hero-cover {
  position: absolute; top: 0; bottom: 0; width: 50%; z-index: 6;
  background:
    linear-gradient(90deg, rgba(0,0,0,.05), transparent 12%, transparent 88%, rgba(0,0,0,.08)),
    var(--paper-2);
}
.hero-cover::after {
  content: ""; position: absolute; inset: 0; opacity: .5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='320' height='320'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.7' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 .12 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.hero-cover.left { left: 0; transform-origin: left center; }
.hero-cover.right { right: 0; transform-origin: right center; }
.hero-roller {
  position: absolute; top: -10px; bottom: -10px; width: 28px; z-index: 7;
  left: 50%; margin-left: -14px;
  background: linear-gradient(90deg, #2b1a12, #6b4a33 35%, #8c6547 50%, #6b4a33 65%, #2b1a12);
  border-radius: 8px;
  box-shadow: 0 0 18px rgba(0,0,0,.5);
}
.hero-roller::before, .hero-roller::after {
  content: ""; position: absolute; left: -6px; right: -6px; height: 26px;
  background: linear-gradient(90deg, #6b5a3a, #c9a227 50%, #6b5a3a); border-radius: 6px;
}
.hero-roller::before { top: 6px; }
.hero-roller::after { bottom: 6px; }

.scroll-hint {
  position: absolute; left: 50%; bottom: 40px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  color: rgba(244,239,230,.85); font-size: 12px; letter-spacing: .3em;
  opacity: 0; z-index: 8;
}
.scroll-hint i { width: 1px; height: 48px; background: rgba(244,239,230,.6); position: relative; overflow: hidden; }
.scroll-hint i::after {
  content: ""; position: absolute; left: 0; top: -100%; width: 100%; height: 100%;
  background: var(--vermilion); animation: hint 1.8s var(--ease-in-out) infinite;
}
@keyframes hint { to { top: 100%; } }

/* ==========================================================================
   ② 四季北京
   ========================================================================== */
.seasons { position: relative; height: 500vh; background: var(--night); }
.seasons-stage { position: sticky; top: 0; height: 100vh; overflow: hidden; }
.seasons-slides { position: absolute; inset: 0; }
.season-slide { position: absolute; inset: 0; will-change: transform; }
.season-img {
  position: absolute; inset: 0; background-size: cover; background-position: center;
  transform: scale(1.12); will-change: transform; background-color: #687879;
}
.season-slide[data-idx="0"] .season-img { background-color: #789488; }
.season-slide[data-idx="1"] .season-img { background-color: #75895a; }
.season-slide[data-idx="2"] .season-img { background-color: #9a7450; }
.season-slide[data-idx="3"] .season-img { background-color: #677786; }
.season-img.image-failed { background-image: linear-gradient(145deg, #778488, #465357 58%, #283238) !important; }
.season-slide[data-idx="0"] .season-img.image-failed { background-image: linear-gradient(145deg, #9db8a1, #5e8174 58%, #344c45) !important; }
.season-slide[data-idx="1"] .season-img.image-failed { background-image: linear-gradient(145deg, #a4b678, #69824f 58%, #34462d) !important; }
.season-slide[data-idx="2"] .season-img.image-failed { background-image: linear-gradient(145deg, #c99b68, #8e633f 58%, #4b3427) !important; }
.season-slide[data-idx="3"] .season-img.image-failed { background-image: linear-gradient(145deg, #b4c4cf, #6c8292 58%, #344553) !important; }
.season-slide::after {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(to top, rgba(11,15,26,.72), rgba(11,15,26,.25) 38%, transparent 60%),
    linear-gradient(to right, rgba(11,15,26,.5), transparent 45%, transparent 60%, rgba(11,15,26,.45));
}
.season-char {
  position: absolute; left: clamp(32px, 8vw, 140px); top: 50%; transform: translateY(-50%);
  font-family: var(--font-brush); font-size: clamp(160px, 38vh, 380px); line-height: 1;
  color: var(--paper); text-shadow: 0 10px 50px rgba(0,0,0,.5); z-index: 2;
  opacity: 0;
}
.season-text {
  position: absolute; right: clamp(48px, 9vw, 160px); bottom: 14vh; max-width: 460px; z-index: 2;
  color: var(--paper); opacity: 0; text-shadow: 0 1px 2px rgba(0,0,0,.5), 0 6px 24px rgba(0,0,0,.45);
}
.season-text .season-en { font-family: var(--font-latin); font-size: 12px; letter-spacing: .45em; color: var(--gold); }
.season-text h3 { font-family: var(--font-display); font-weight: 400; font-size: clamp(24px, 3vw, 36px); margin: 10px 0 14px; letter-spacing: .08em; }
.season-text p { font-size: 15px; line-height: 2; color: rgba(244,239,230,.88); }
.season-text::before {
  content: ""; position: absolute; left: -24px; top: 6px; bottom: 6px; width: 1px;
  background: linear-gradient(to bottom, var(--gold), transparent);
}
.seasons-head { position: absolute; left: clamp(32px, 8vw, 140px); top: 14vh; z-index: 3; }
.seasons-head h2 { font-size: clamp(22px, 2.6vw, 32px); }
.seasons-indicator {
  position: absolute; left: 50%; bottom: 36px; transform: translateX(-50%); z-index: 3;
  display: flex; gap: 26px; font-family: var(--font-display); font-size: 15px; letter-spacing: .2em;
  color: rgba(244,239,230,.6); text-shadow: 0 1px 2px rgba(0,0,0,.5);
}
.seasons-indicator span { position: relative; transition: color .4s; padding-bottom: 8px; }
.seasons-indicator span::after {
  content: ""; position: absolute; left: 50%; bottom: 0; width: 0; height: 1px; background: var(--vermilion);
  transform: translateX(-50%); transition: width .4s;
}
.seasons-indicator span.active { color: var(--paper); }
.seasons-indicator span.active::after { width: 100%; }
.seasons-drag-hint {
  position: absolute; right: clamp(48px, 9vw, 160px); top: 14vh; z-index: 3;
  font-size: 11px; letter-spacing: .3em; color: rgba(244,239,230,.5);
}

/* ==========================================================================
   ③ 八百年建都史（横向长河）
   ========================================================================== */
.history { position: relative; height: 520vh; background: var(--paper); }
.history-stage { position: sticky; top: 0; height: 100vh; overflow: hidden; }
.history-era-bg {
  position: absolute; right: -2vw; bottom: -8vh; z-index: 0;
  font-family: var(--font-brush); font-size: 60vh; line-height: 1; color: rgba(26,26,26,.05);
  pointer-events: none; user-select: none; transition: opacity .6s;
}
.history-head { position: absolute; left: var(--gutter); top: 10vh; z-index: 2; }
.timeline-track {
  position: absolute; left: 0; top: 0; height: 100vh; z-index: 1;
  display: flex; align-items: center; gap: clamp(32px, 4vw, 72px);
  padding: 0 var(--gutter) 0 max(var(--gutter), 34vw);
  will-change: transform;
}
.timeline-line {
  position: absolute; left: 0; right: 0; top: calc(50% - 150px); height: 1px;
  background: rgba(201,162,39,.25);
}
.timeline-line i {
  display: block; height: 100%; width: 100%; background: var(--gold);
  box-shadow: 0 0 8px rgba(201,162,39,.6); transform: scaleX(0); transform-origin: left; will-change: transform;
}
.era-card {
  position: relative; flex: 0 0 auto; width: clamp(300px, 34vw, 480px);
  padding: 34px 34px 30px; margin-top: 60px;
  background: rgba(255,255,255,.82); border: 1px solid rgba(201,162,39,.35);
  box-shadow: 0 20px 50px -30px rgba(26,26,26,.35);
  transition: border-color .5s, box-shadow .5s, transform .6s var(--ease-out);
}
.era-card::before {
  content: ""; position: absolute; left: 50%; top: -60px; width: 1px; height: 60px;
  background: linear-gradient(to bottom, var(--gold), transparent);
  opacity: .5;
}
.era-dot {
  position: absolute; left: 50%; top: -60px; width: 10px; height: 10px; margin: -5px 0 0 -5px;
  border-radius: 50%; border: 1px solid var(--gold); background: var(--paper);
  transition: background-color .4s, box-shadow .4s, transform .4s;
}
.era-card.active { border-color: var(--vermilion); transform: translateY(-8px); }
.era-card.active .era-dot { background: var(--vermilion); border-color: var(--vermilion); box-shadow: 0 0 0 6px rgba(200,50,43,.15); transform: scale(1.2); }
.era-year {
  font-family: var(--font-latin); font-size: clamp(44px, 5vw, 64px); line-height: 1; letter-spacing: .02em;
  color: var(--ink); opacity: .25; transition: opacity .5s, color .5s;
}
.era-card.active .era-year { opacity: 1; color: var(--vermilion); }
.era-tag {
  display: inline-block; margin: 14px 0 12px; padding: 2px 10px;
  border: 1px solid var(--ink); font-family: var(--font-display); font-size: 13px; letter-spacing: .25em;
}
.era-card h3 { font-family: var(--font-display); font-weight: 400; font-size: 24px; letter-spacing: .08em; margin-bottom: 10px; }
.era-card p { font-size: 14.5px; line-height: 1.95; color: var(--ink-2); }
.era-card .era-seal { position: absolute; right: 22px; top: 22px; opacity: 0; transform: rotate(-6deg) scale(1.6); transition: opacity .4s, transform .5s var(--ease-out); }
.era-card.active .era-seal { opacity: 1; transform: rotate(-6deg) scale(1); }
.history-progress {
  position: absolute; left: var(--gutter); right: var(--gutter); bottom: 32px; height: 1px; z-index: 2;
  background: rgba(26,26,26,.12);
}
.history-progress i {
  display: block; height: 100%; width: 100%; background: var(--vermilion);
  transform: scaleX(0); transform-origin: left; will-change: transform;
}

/* ==========================================================================
   ④ 中轴线
   ========================================================================== */
.axis { position: relative; padding: 16vh var(--gutter) 10vh; background: var(--paper); }
.axis-wrap { position: relative; max-width: 1240px; margin: 12vh auto 0; }
.axis-line { position: absolute; left: 50%; top: 0; bottom: 0; width: 1px; background: rgba(201,162,39,.25); }
.axis-line i { display: block; width: 100%; height: 100%; background: var(--gold); transform-origin: top; transform: scaleY(0); box-shadow: 0 0 10px rgba(201,162,39,.6); }
.axis-item {
  position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 6vw, 96px);
  align-items: center; padding: 8vh 0;
}
.axis-item .pic { aspect-ratio: 16 / 10; clip-path: inset(100% 0 0 0); }
.axis-item .pic img { transform: scale(1.18); }
.axis-item.lit .pic { clip-path: inset(0 0 0 0); }
.axis-item.lit .pic img { transform: scale(1); }
.axis-item .pic, .axis-item .pic img { transition: clip-path 1.3s var(--ease-out), transform 1.6s var(--ease-out), opacity .8s; }
.axis-text { opacity: 0; transform: translateX(30px); transition: opacity 1s var(--ease-out) .2s, transform 1s var(--ease-out) .2s; }
.axis-item:nth-child(even) .axis-text { transform: translateX(-30px); }
.axis-item.lit .axis-text { opacity: 1; transform: none; }
.axis-item:nth-child(even) .pic { order: 2; }
.axis-item:nth-child(odd) .axis-text { text-align: left; padding-left: 8px; }
.axis-item:nth-child(even) .axis-text { text-align: right; padding-right: 8px; }
.axis-num { font-family: var(--font-display); font-size: 13px; letter-spacing: .4em; color: var(--gold-2); }
.axis-text h3 { font-family: var(--font-brush); font-weight: 400; font-size: clamp(44px, 5vw, 72px); line-height: 1.1; margin: 8px 0 4px; }
.axis-en { font-family: var(--font-latin); font-size: 12px; letter-spacing: .4em; color: var(--ink-3); }
.axis-note { margin-top: 18px; color: var(--ink-2); font-size: 15px; max-width: 34em; }
.axis-item:nth-child(even) .axis-note { margin-left: auto; }
.axis-dot {
  position: absolute; left: 50%; top: 50%; width: 14px; height: 14px; margin: -7px 0 0 -7px; z-index: 2;
  border-radius: 50%; background: var(--paper); border: 1px solid var(--gold);
  transition: background-color .5s, box-shadow .5s, transform .5s;
}
.axis-item.lit .axis-dot { background: var(--vermilion); border-color: var(--vermilion); box-shadow: 0 0 0 8px rgba(200,50,43,.14), 0 0 24px rgba(200,50,43,.6); transform: scale(1.15); }

/* ==========================================================================
   ⑤ 京城七景
   ========================================================================== */
.scenes { position: relative; padding: 16vh var(--gutter) 14vh; background: var(--paper-2); }
.scene-grid {
  display: flex; flex-wrap: wrap; justify-content: center; gap: clamp(18px, 2.4vw, 32px);
  max-width: 1320px; margin: 10vh auto 0;
}
.card {
  --rx: 0deg; --ry: 0deg; --flip: 0deg;
  position: relative; width: clamp(220px, 20vw, 290px); aspect-ratio: 3 / 4;
  perspective: 1400px; opacity: 0; transform: translateY(60px);
}
.card.in { opacity: 1; transform: none; transition: opacity .9s var(--ease-out), transform .9s var(--ease-out); }
.card-inner {
  position: absolute; inset: 0; transform-style: preserve-3d;
  transform: rotateX(var(--rx)) rotateY(calc(var(--ry) + var(--flip)));
  transition: transform .9s var(--ease-out);
  will-change: transform;
}
.card.is-tilting .card-inner { transition: transform .12s linear; }
.card:hover, .card.flipped { --flip: 180deg; }
.card-face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  overflow: hidden; border-radius: 4px;
  box-shadow: 0 30px 60px -30px rgba(26,26,26,.5);
}
.card-front .pic { position: absolute; inset: 0; }
.card-front::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(11,15,26,.85), rgba(11,15,26,.1) 55%, transparent);
}
.card-front .card-name {
  position: absolute; left: 22px; bottom: 40px; z-index: 2; color: var(--paper);
  font-family: var(--font-brush); font-size: 44px; line-height: 1;
}
.card-front .card-en { position: absolute; left: 24px; bottom: 18px; z-index: 2; font-family: var(--font-latin); font-size: 12px; letter-spacing: .3em; color: rgba(244,239,230,.75); }
.card-front .card-idx {
  position: absolute; right: 16px; top: 16px; z-index: 2; padding: 8px 6px;
  writing-mode: vertical-rl; text-orientation: upright;
  background: var(--vermilion); color: var(--paper); font-family: var(--font-display); font-size: 12px; letter-spacing: .2em;
}
.card-back {
  transform: rotateY(180deg); background: var(--paper);
  padding: 28px 26px; display: flex; flex-direction: column;
  border: 1px solid rgba(201,162,39,.4);
}
.card-back::before {
  content: ""; position: absolute; inset: 8px; border: 1px solid rgba(201,162,39,.35); pointer-events: none;
}
.card-back h3 { font-family: var(--font-display); font-weight: 400; font-size: 28px; letter-spacing: .1em; }
.card-back .card-en { font-family: var(--font-latin); font-size: 12px; letter-spacing: .3em; color: var(--gold-2); margin-bottom: 14px; }
.card-back p { font-size: 14px; line-height: 1.9; color: var(--ink-2); flex: 1; }
.card-meta { display: grid; gap: 6px; margin-top: 12px; font-size: 13px; color: var(--ink-2); }
.card-meta b { font-weight: 400; color: var(--gold-2); margin-right: 10px; letter-spacing: .2em; }
.card-back .seal { position: absolute; right: 22px; bottom: 22px; }

/* ==========================================================================
   ⑥ 老北京的一天
   ========================================================================== */
.day { position: relative; padding: 16vh 0 0; background: #f3e6cf; color: var(--ink); transition: color .8s; }
.day-head { padding: 0 var(--gutter); }
.day-step {
  position: relative; min-height: 100vh; display: grid; grid-template-columns: 1fr 1fr;
  align-items: center; gap: clamp(32px, 6vw, 96px); padding: 10vh var(--gutter);
  max-width: 1400px; margin: 0 auto;
}
.day-step:nth-child(even) .day-pic { order: 2; }
.day-pic { aspect-ratio: 4 / 3; clip-path: inset(6% 0 6% 0 round 4px); box-shadow: 0 40px 80px -40px rgba(0,0,0,.45); }
.day-pic img { transform: scale(1.15); will-change: transform; }
.day-info { position: relative; }
.day-time {
  font-family: var(--font-latin); font-size: clamp(64px, 9vw, 128px); line-height: 1; letter-spacing: .02em;
  font-variant-numeric: tabular-nums; opacity: .9;
}
.day-info h3 { font-family: var(--font-display); font-weight: 400; font-size: clamp(28px, 3.2vw, 44px); letter-spacing: .12em; margin: 14px 0 16px; }
.day-info p { max-width: 30em; font-size: 15.5px; line-height: 2; opacity: .85; }
.day-info::before {
  content: ""; position: absolute; left: -24px; top: 12px; width: 1px; height: 80px;
  background: linear-gradient(to bottom, var(--vermilion), transparent);
}
.day-step:nth-child(even) .day-info { text-align: right; }
.day-step:nth-child(even) .day-info::before { left: auto; right: -24px; }
.day-step:nth-child(even) .day-info p { margin-left: auto; }

/* ==========================================================================
   ⑦ 结尾
   ========================================================================== */
.ending { position: relative; min-height: 100vh; background: var(--night); color: var(--paper); overflow: hidden;
  display: flex; flex-direction: column; justify-content: center; padding: 20vh var(--gutter) 40px; }
.ending-mountains { position: absolute; left: 0; right: 0; bottom: 0; width: 100%; height: 42vh; }
.ending-mountains .m1 { fill: #131a2b; }
.ending-mountains .m2 { fill: #0e1421; }
.ending-content { position: relative; text-align: center; z-index: 1; }
.ending-en { font-family: var(--font-latin); font-size: 13px; letter-spacing: .5em; color: var(--gold); margin-bottom: 26px; }
.ending-title { font-family: var(--font-brush); font-weight: 400; font-size: clamp(40px, 7vw, 104px); line-height: 1.25; letter-spacing: .06em; }
.ending-title span { display: inline-block; opacity: 0; transform: translateY(24px); filter: blur(6px); }
.ending-title .br { display: none; }
.ending-seal { margin: 40px auto 0; opacity: 0; transform: rotate(-6deg) scale(2.2); }
.ending-sub { margin-top: 30px; color: rgba(244,239,230,.7); letter-spacing: .15em; font-size: 15px; opacity: 0; }
.ending-flash { position: absolute; inset: 0; background: var(--vermilion); opacity: 0; pointer-events: none; }
.footer { position: relative; z-index: 1; margin-top: auto; padding-top: 18vh; text-align: center; font-size: 12px; color: rgba(244,239,230,.5); }
.credits-toggle { letter-spacing: .3em; padding: 8px 16px; border: 1px solid rgba(244,239,230,.25); border-radius: 999px; font-size: 12px; color: rgba(244,239,230,.7); }
.credits-list { list-style: none; margin: 18px auto 0; padding: 0; max-width: 900px; text-align: left; columns: 2; column-gap: 32px; }
.credits-list li { break-inside: avoid; padding: 4px 0; line-height: 1.6; }
.credits-list a { color: rgba(244,239,230,.8); border-bottom: 1px dotted rgba(244,239,230,.3); }
.credits-list span { color: rgba(244,239,230,.45); }
.footer-line { margin-top: 24px; letter-spacing: .1em; }


/* ==========================================================================
   ⑥ 京味儿 · 美食
   ========================================================================== */
.food { position: relative; padding: 16vh var(--gutter) 12vh; background: #2a1a12; color: var(--paper); overflow: hidden; }
.food::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .35;
  background: radial-gradient(60% 50% at 20% 0%, rgba(201,162,39,.25), transparent 60%), radial-gradient(50% 40% at 90% 100%, rgba(200,50,43,.25), transparent 60%);
}
.food .sec-head .sec-sub { color: rgba(244,239,230,.65); }
.food-tools { position: relative; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px; max-width: 1240px; margin: 8vh auto 0; }
.food-tabs { display: flex; flex-wrap: wrap; gap: 10px; }
.food-tab {
  padding: 10px 18px; border: 1px solid rgba(201,162,39,.45); border-radius: 3px;
  font-family: var(--font-display); font-size: 15px; letter-spacing: .25em; color: rgba(244,239,230,.7);
  background: linear-gradient(to bottom, rgba(255,255,255,.04), rgba(0,0,0,.15));
  transition: color .3s, border-color .3s, background-color .3s, transform .3s;
}
.food-tab:hover { color: var(--paper); transform: translateY(-2px); }
.food-tab.active { color: #2a1a12; background: var(--gold); border-color: var(--gold); }
.food-order {
  padding: 10px 22px; border: 1px solid var(--vermilion); border-radius: 999px;
  font-family: var(--font-display); font-size: 14px; letter-spacing: .2em; color: var(--paper);
  background: var(--vermilion); transition: transform .3s, box-shadow .3s;
}
.food-order:hover { transform: translateY(-2px); box-shadow: 0 10px 30px -10px rgba(200,50,43,.8); }
.food-menu { position: relative; max-width: 1240px; margin: 28px auto 0; }
.food-menu-paper {
  position: relative; max-width: 520px; margin: 0 auto; padding: 28px 32px 24px;
  background: var(--paper); color: var(--ink); border: 1px solid rgba(201,162,39,.6);
  box-shadow: 0 30px 60px -30px rgba(0,0,0,.8);
  transform: rotate(-1.2deg);
}
.food-menu-paper::before { content: ""; position: absolute; inset: 8px; border: 1px solid rgba(201,162,39,.5); pointer-events: none; }
.food-menu-title { display: block; text-align: center; font-family: var(--font-brush); font-size: 30px; color: var(--vermilion); margin-bottom: 14px; }
.food-menu-list { list-style: none; margin: 0; padding: 0; }
.food-menu-list li { display: flex; align-items: baseline; gap: 14px; padding: 8px 0; border-bottom: 1px dashed rgba(26,26,26,.15); font-size: 15px; }
.food-menu-list li b { font-family: var(--font-display); font-weight: 400; letter-spacing: .3em; color: var(--gold-2); flex: 0 0 3.2em; }
.food-menu-list li span { font-family: var(--font-display); font-size: 18px; }
.food-menu-list li em { font-style: normal; color: var(--ink-3); font-size: 13px; margin-left: auto; }
.food-menu-again { display: block; margin: 16px auto 0; padding: 6px 18px; border: 1px solid var(--vermilion); color: var(--vermilion); border-radius: 999px; font-size: 13px; letter-spacing: .2em; }

.food-grid { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; max-width: 1240px; margin: 36px auto 0; }
.food-card {
  position: relative; border-radius: 4px; overflow: hidden; background: #3a2418;
  border: 1px solid rgba(201,162,39,.25); text-align: left;
  opacity: 0; transform: translateY(40px);
  transition: transform .5s var(--ease-out), box-shadow .5s, border-color .5s, opacity .8s var(--ease-out);
}
.food-card.in { opacity: 1; transform: none; }
.food-card:hover { transform: translateY(-6px); box-shadow: 0 30px 50px -25px rgba(0,0,0,.9); border-color: rgba(201,162,39,.6); }
.food-card.hide { display: none; }
.food-card .pic { aspect-ratio: 4 / 3; }
.food-card .pic img { transition: transform 1.2s var(--ease-out), opacity .8s; }
.food-card:hover .pic img { transform: scale(1.06); }
.food-card-body { padding: 16px 18px 18px; }
.food-card-name { font-family: var(--font-brush); font-size: 30px; line-height: 1; color: var(--paper); }
.food-card-en { display: block; margin-top: 4px; font-family: var(--font-latin); font-size: 11px; letter-spacing: .25em; color: rgba(244,239,230,.55); text-transform: uppercase; }
.food-card-meta { display: flex; align-items: center; justify-content: space-between; margin-top: 12px; font-size: 12px; color: rgba(244,239,230,.7); }
.food-courage { display: inline-flex; align-items: center; gap: 3px; }
.food-courage i { width: 9px; height: 9px; border-radius: 50%; background: rgba(244,239,230,.18); }
.food-courage i.on { background: var(--vermilion); box-shadow: 0 0 6px rgba(200,50,43,.8); }
.food-courage::before { content: "勇气"; margin-right: 6px; letter-spacing: .2em; opacity: .7; }
.food-when { padding: 2px 8px; border: 1px solid rgba(201,162,39,.5); color: var(--gold); letter-spacing: .2em; border-radius: 2px; }
.food-card .food-stamp-mark {
  position: absolute; right: 12px; top: 12px; width: 40px; height: 40px; opacity: 0; transform: scale(2) rotate(-12deg);
  transition: opacity .4s, transform .5s var(--ease-out);
}
.food-card.tasted .food-stamp-mark { opacity: 1; transform: scale(1) rotate(-8deg); }

.food-stamps { position: relative; max-width: 1240px; margin: 10vh auto 0; padding: 32px 36px; border: 1px solid rgba(201,162,39,.35); background: rgba(0,0,0,.2); }
.food-stamps-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 20px; }
.food-stamps-title { font-family: var(--font-display); font-size: 24px; letter-spacing: .2em; }
.food-stamps-count { font-family: var(--font-latin); font-size: 14px; letter-spacing: .2em; color: rgba(244,239,230,.7); }
.food-stamps-count b { font-size: 22px; color: var(--gold); }
.food-stamps-grid { display: grid; grid-template-columns: repeat(13, 1fr); gap: 10px; }
.food-stamp { aspect-ratio: 1; border: 1px dashed rgba(244,239,230,.25); border-radius: 4px; display: grid; place-items: center; }
.food-stamp .seal { width: 78%; height: 78%; font-size: 15px; padding: 2px; opacity: 0; transform: rotate(-6deg) scale(2); transition: opacity .4s, transform .5s var(--ease-out); }
.food-stamp.on .seal { opacity: 1; transform: rotate(-6deg) scale(1); }
.food-master { position: absolute; right: 36px; bottom: 72px; opacity: 0; transform: rotate(-8deg) scale(2.4); pointer-events: none; }
.food-master.on { opacity: 1; transform: rotate(-8deg) scale(1); transition: opacity .3s, transform .5s var(--ease-out); }
.food-stamps-tip { margin-top: 18px; font-size: 13px; color: rgba(244,239,230,.55); letter-spacing: .1em; }

.food-more { max-width: 1240px; margin: 6vh auto 0; }
.food-more-label { display: block; font-family: var(--font-display); font-size: 14px; letter-spacing: .3em; color: var(--gold); margin-bottom: 12px; }
.food-marquee { overflow: hidden; -webkit-mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent); mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent); }
.food-marquee-track { display: flex; gap: 14px; width: max-content; animation: marquee 60s linear infinite; }
.food-marquee:hover .food-marquee-track { animation-play-state: paused; }
.food-marquee-track span { padding: 8px 16px; border: 1px solid rgba(244,239,230,.2); border-radius: 999px; font-family: var(--font-display); font-size: 16px; letter-spacing: .15em; color: rgba(244,239,230,.8); white-space: nowrap; }
@keyframes marquee { to { transform: translateX(-50%); } }

.food-modal { position: fixed; inset: 0; z-index: 90; display: grid; place-items: center; padding: 20px; }
.food-modal-backdrop { position: absolute; inset: 0; background: rgba(11,15,26,.75); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
.food-modal-card {
  position: relative; display: grid; grid-template-columns: 1.15fr 1fr; width: min(960px, 100%); max-height: 90vh; overflow: auto;
  background: var(--paper); color: var(--ink); border: 1px solid rgba(201,162,39,.6); box-shadow: 0 40px 80px -30px rgba(0,0,0,.9);
}
.food-modal-pic { min-height: 340px; height: 100%; }
.food-modal-body { position: relative; padding: 34px 34px 30px; }
.food-modal-close { position: absolute; right: 14px; top: 8px; font-size: 30px; line-height: 1; color: var(--ink-3); z-index: 2; }
.food-modal-cat { font-family: var(--font-display); font-size: 12px; letter-spacing: .4em; color: var(--gold-2); }
.food-modal-name { font-family: var(--font-brush); font-weight: 400; font-size: 46px; line-height: 1.1; margin-top: 6px; }
.food-modal-en { display: block; font-family: var(--font-latin); font-size: 12px; letter-spacing: .3em; color: var(--ink-3); margin-bottom: 14px; }
.food-modal-meta { display: flex; gap: 16px; align-items: center; font-size: 12px; color: var(--ink-2); margin-bottom: 14px; }
.food-modal-meta .food-courage i { background: rgba(26,26,26,.12); }
.food-modal-meta .food-when { color: var(--gold-2); border-color: rgba(201,162,39,.6); }
.food-modal-story { font-size: 15px; line-height: 2; color: var(--ink-2); }
.food-modal-where { margin-top: 12px; font-size: 13px; color: var(--ink-3); }
.food-modal-where::before { content: "推荐 · "; color: var(--gold-2); letter-spacing: .2em; }
.food-taste { margin-top: 20px; padding: 10px 28px; background: var(--vermilion); color: var(--paper); border-radius: 999px; font-family: var(--font-display); font-size: 15px; letter-spacing: .3em; transition: transform .3s; }
.food-taste:hover { transform: translateY(-2px); }
.food-taste[disabled] { background: var(--jade); }
.food-reaction { margin-top: 14px; min-height: 1.8em; font-family: var(--font-display); font-size: 17px; color: var(--vermilion); letter-spacing: .1em; }

/* ==========================================================================
   ⑦ 京剧脸谱
   ========================================================================== */
.opera { position: relative; padding: 16vh var(--gutter) 12vh; background: var(--paper); }
.opera-stage { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 6vw, 96px); align-items: center; max-width: 1200px; margin: 8vh auto 0; }
.opera-mask-wrap { position: relative; width: min(100%, 460px); margin: 0 auto; }
.opera-mask { width: 100%; height: auto; filter: drop-shadow(0 30px 40px rgba(26,26,26,.25)); }
.opera-mask .m-base { fill: var(--m1, #c8322b); transition: fill .8s var(--ease-out); }
.opera-mask .m-accent { fill: var(--m2, #1a1a1a); transition: fill .8s var(--ease-out); }
.opera-mask .m-outline { fill: none; stroke: var(--ink); stroke-width: 3; }
.opera-mask .m-eyeball { fill: var(--paper); }
.opera-mask .m-pupil { fill: var(--ink); }
.opera-mask .m-mouth { fill: #7a1f1a; }
.opera-mask .m-lip { fill: var(--ink); }
.opera-mask .m-emblem { fill: var(--m2, #1a1a1a); opacity: 0; transition: opacity .5s, fill .8s; }
.opera-mask .m-emblem-eye circle { fill: var(--paper); }
.opera-mask .m-beard { fill: var(--m2, #1a1a1a); opacity: 0; transition: opacity .5s, fill .8s; }
.opera-mask.beard .m-beard { opacity: 1; }
.opera-mask.emblem-moon .m-emblem-moon, .opera-mask.emblem-fire .m-emblem-fire, .opera-mask.emblem-eye .m-emblem-eye, .opera-mask.emblem-cloud .m-emblem-cloud { opacity: 1; }
.opera-brush { position: absolute; inset: 0; pointer-events: none; background: var(--paper); opacity: 0; clip-path: inset(0 0 100% 0); }
.opera-swatches { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 30px; }
.opera-swatch {
  display: flex; align-items: center; gap: 10px; padding: 8px 16px 8px 10px;
  border: 1px solid rgba(26,26,26,.15); border-radius: 999px; font-family: var(--font-display); font-size: 15px; letter-spacing: .15em;
  transition: border-color .3s, transform .3s, background-color .3s;
}
.opera-swatch i { width: 26px; height: 26px; border-radius: 50%; border: 2px solid var(--paper); box-shadow: 0 0 0 1px rgba(26,26,26,.2); }
.opera-swatch:hover { transform: translateY(-2px); }
.opera-swatch.active { border-color: var(--ink); background: rgba(26,26,26,.04); }
.opera-color-name { font-family: var(--font-display); font-size: 13px; letter-spacing: .4em; color: var(--gold-2); }
.opera-role { font-family: var(--font-brush); font-weight: 400; font-size: clamp(56px, 6vw, 88px); line-height: 1.1; margin: 6px 0 4px; }
.opera-trait { display: inline-block; padding: 3px 12px; border: 1px solid var(--vermilion); color: var(--vermilion); font-family: var(--font-display); font-size: 13px; letter-spacing: .3em; }
.opera-story { margin-top: 18px; max-width: 32em; font-size: 15.5px; line-height: 2; color: var(--ink-2); }

/* ==========================================================================
   ⑧ 北京话考试
   ========================================================================== */
.dialect { position: relative; padding: 16vh var(--gutter) 12vh; background: var(--paper-2); }
.exam {
  position: relative; max-width: 760px; margin: 8vh auto 0; padding: 36px 40px 40px;
  background: var(--paper); border: 1px solid rgba(200,50,43,.5);
  background-image: repeating-linear-gradient(to bottom, transparent 0 39px, rgba(200,50,43,.12) 39px 40px);
  box-shadow: 0 30px 60px -40px rgba(26,26,26,.4);
}
.exam::before { content: ""; position: absolute; inset: 10px; border: 1px solid rgba(200,50,43,.35); pointer-events: none; }
.exam-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 10px; }
.exam-title { font-family: var(--font-display); font-size: 20px; letter-spacing: .25em; color: var(--vermilion); }
.exam-progress { font-family: var(--font-display); font-size: 13px; letter-spacing: .2em; color: var(--ink-3); }
.exam-progress b { font-size: 18px; color: var(--ink); }
.exam-bar { height: 2px; background: rgba(26,26,26,.1); margin-bottom: 26px; }
.exam-bar i { display: block; height: 100%; width: 0; background: var(--vermilion); transition: width .6s var(--ease-out); }
.exam-start { text-align: center; padding: 20px 0 10px; }
.exam-start p { font-family: var(--font-display); font-size: 18px; letter-spacing: .1em; margin-bottom: 22px; }
.exam-btn { padding: 10px 28px; border: 1px solid var(--ink); border-radius: 999px; font-family: var(--font-display); font-size: 15px; letter-spacing: .3em; background: var(--ink); color: var(--paper); transition: transform .3s, background-color .3s; }
.exam-btn:hover { transform: translateY(-2px); background: var(--vermilion); border-color: var(--vermilion); }
.exam-question { font-family: var(--font-display); font-size: clamp(20px, 2.2vw, 26px); line-height: 1.6; letter-spacing: .05em; margin-bottom: 22px; }
.exam-options { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.exam-opt {
  padding: 14px 18px; text-align: left; border: 1px solid rgba(26,26,26,.2); background: rgba(255,255,255,.5);
  font-size: 15.5px; line-height: 1.6; transition: border-color .3s, background-color .3s, transform .3s;
}
.exam-opt b { font-family: var(--font-display); color: var(--gold-2); margin-right: 10px; }
.exam-opt:hover { border-color: var(--ink); transform: translateY(-2px); }
.exam-opt.right { border-color: var(--jade); background: rgba(61,122,106,.12); }
.exam-opt.wrong { border-color: var(--vermilion); background: rgba(200,50,43,.1); }
.exam-opt[disabled] { cursor: default; }
.exam-explain { margin-top: 18px; padding: 14px 18px; border-left: 3px solid var(--gold); background: rgba(201,162,39,.08); font-size: 14.5px; line-height: 1.9; color: var(--ink-2); }
.exam-next { margin-top: 18px; }
.exam-result { text-align: center; padding: 10px 0; }
.exam-score { font-family: var(--font-latin); font-size: 72px; line-height: 1; color: var(--ink); }
.exam-score span { font-size: 24px; color: var(--ink-3); margin-left: 6px; }
.exam-grade { margin: 22px auto 16px; opacity: 0; transform: rotate(-8deg) scale(2.4); }
.exam-grade.on { opacity: 1; transform: rotate(-6deg) scale(1); transition: opacity .3s, transform .5s var(--ease-out); }
.exam-comment { font-family: var(--font-display); font-size: 17px; letter-spacing: .1em; margin-bottom: 20px; }

/* ==========================================================================
   ⑨ 二十四节气
   ========================================================================== */
.terms { position: relative; padding: 16vh var(--gutter) 12vh; background: #101a33; color: var(--paper); overflow: hidden; }
.terms .sec-head .sec-sub { color: rgba(244,239,230,.6); }
.terms-stage { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 5vw, 80px); align-items: center; max-width: 1200px; margin: 6vh auto 0; }
.terms-wheel-wrap { position: relative; width: min(100%, 560px); aspect-ratio: 1; margin: 0 auto; touch-action: none; }
.terms-wheel { width: 100%; height: 100%; will-change: transform; }
.terms-wheel .ring { fill: none; stroke: rgba(201,162,39,.35); stroke-width: 1; }
.terms-wheel .ring-outer { stroke: rgba(201,162,39,.6); }
.terms-wheel .tick { stroke: rgba(244,239,230,.35); stroke-width: 1; }
.terms-wheel .tick.major { stroke: var(--gold); stroke-width: 2; }
.terms-wheel text { fill: rgba(244,239,230,.75); font-family: var(--font-display); font-size: 17px; letter-spacing: .1em; transition: fill .3s; }
.terms-wheel text.active { fill: var(--gold); font-size: 20px; }
.terms-wheel .season-label { fill: rgba(201,162,39,.5); font-size: 13px; letter-spacing: .4em; }
.terms-pointer { position: absolute; left: 50%; top: -6px; width: 0; height: 0; margin-left: -9px; border-left: 9px solid transparent; border-right: 9px solid transparent; border-top: 16px solid var(--vermilion); z-index: 2; filter: drop-shadow(0 2px 6px rgba(200,50,43,.6)); }
.terms-center { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); text-align: center; pointer-events: none; }
.terms-today { display: block; font-family: var(--font-display); font-size: 12px; letter-spacing: .4em; color: var(--gold); min-height: 1.6em; }
.terms-name { font-family: var(--font-brush); font-size: clamp(64px, 8vw, 110px); line-height: 1.1; color: var(--paper); }
.terms-date { font-family: var(--font-latin); font-size: 13px; letter-spacing: .3em; color: rgba(244,239,230,.6); }
.terms-info { display: grid; grid-template-columns: auto 1fr auto; gap: 18px; align-items: center; }
.terms-custom { font-family: var(--font-display); font-size: clamp(20px, 2.2vw, 28px); line-height: 1.8; letter-spacing: .04em; min-height: 4em; }
.terms-prev, .terms-next { width: 44px; height: 44px; border: 1px solid rgba(244,239,230,.35); border-radius: 50%; color: var(--paper); font-size: 24px; line-height: 1; transition: background-color .3s, border-color .3s; }
.terms-prev:hover, .terms-next:hover { background: rgba(244,239,230,.1); border-color: var(--gold); }

/* ==========================================================================
   ⑪ 行程规划器
   ========================================================================== */
.planner { position: relative; padding: 16vh var(--gutter) 14vh; background: var(--paper); }
.planner-controls { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: center; gap: 28px 40px; max-width: 1100px; margin: 7vh auto 0; }
.planner-group { display: flex; flex-direction: column; gap: 10px; }
.planner-label { font-family: var(--font-display); font-size: 13px; letter-spacing: .4em; color: var(--gold-2); }
.planner-days, .planner-interests { display: flex; flex-wrap: wrap; gap: 10px; }
.planner-day, .planner-interest {
  padding: 10px 18px; border: 1px solid rgba(26,26,26,.2); border-radius: 3px; background: rgba(255,255,255,.4);
  font-family: var(--font-display); font-size: 15px; letter-spacing: .2em; transition: border-color .3s, background-color .3s, color .3s, transform .3s;
}
.planner-day:hover, .planner-interest:hover { transform: translateY(-2px); border-color: var(--ink); }
.planner-day.active, .planner-interest.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.planner-interest i { display: inline-grid; place-items: center; width: 22px; height: 22px; margin-right: 8px; border: 1px solid currentColor; border-radius: 3px; font-family: var(--font-brush); font-size: 14px; font-style: normal; transform: rotate(-6deg); }
.planner-go { padding: 12px 32px; border-radius: 999px; background: var(--vermilion); color: var(--paper); font-family: var(--font-display); font-size: 16px; letter-spacing: .3em; transition: transform .3s, box-shadow .3s; }
.planner-go:hover { transform: translateY(-2px); box-shadow: 0 12px 30px -12px rgba(200,50,43,.8); }
.planner-result { max-width: 1240px; margin: 7vh auto 0; }
.planner-days-out { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.plan-day { position: relative; padding: 26px 26px 22px; background: rgba(255,255,255,.45); border: 1px solid rgba(201,162,39,.45); opacity: 0; transform: translateY(30px); }
.plan-day.in { opacity: 1; transform: none; transition: opacity .8s var(--ease-out), transform .8s var(--ease-out); }
.plan-day::before { content: ""; position: absolute; inset: 8px; border: 1px solid rgba(201,162,39,.3); pointer-events: none; }
.plan-day-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 18px; }
.plan-day-num { font-family: var(--font-brush); font-size: 34px; color: var(--vermilion); line-height: 1; }
.plan-day-name { font-family: var(--font-display); font-size: 18px; letter-spacing: .2em; }
.plan-steps { list-style: none; margin: 0; padding: 0; position: relative; }
.plan-steps::before { content: ""; position: absolute; left: 62px; top: 8px; bottom: 8px; width: 1px; background: rgba(201,162,39,.5); }
.plan-step { position: relative; display: grid; grid-template-columns: 50px 1fr; gap: 24px; padding: 8px 0 14px; }
.plan-step::before { content: ""; position: absolute; left: 58px; top: 15px; width: 9px; height: 9px; border-radius: 50%; background: var(--paper); border: 1px solid var(--gold); }
.plan-step.tag-food::before { background: var(--vermilion); border-color: var(--vermilion); }
.plan-step.tag-art::before { background: var(--jade); border-color: var(--jade); }
.plan-step.tag-nature::before { background: var(--gold); }
.plan-time { font-family: var(--font-latin); font-size: 15px; letter-spacing: .05em; color: var(--ink-3); padding-top: 2px; }
.plan-place { font-family: var(--font-display); font-size: 18px; letter-spacing: .05em; }
.plan-note { font-size: 13.5px; color: var(--ink-3); line-height: 1.7; margin-top: 2px; }
.planner-actions { display: flex; justify-content: center; gap: 14px; margin-top: 30px; }
.planner-shuffle, .planner-copy { padding: 9px 22px; border: 1px solid var(--ink); border-radius: 999px; font-family: var(--font-display); font-size: 14px; letter-spacing: .25em; transition: background-color .3s, color .3s; }
.planner-shuffle:hover, .planner-copy:hover { background: var(--ink); color: var(--paper); }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1024px) {
  .card { width: clamp(220px, 28vw, 280px); }
}
@media (max-width: 768px) {
  body { font-size: 15px; }
  .topbar { padding: 14px 16px; }
  .brand-text { display: none; }
  .bgm-label { display: none; }
  .scroll-nav { right: 10px; gap: 14px; }
  .scroll-nav a span { display: none; }

  .hero { height: 160vh; }
  .hero-title { right: 24px; font-size: clamp(96px, 18vh, 150px); }
  .hero-seal { right: 26px; bottom: 16vh; }
  .hero-sub { left: 24px; font-size: 14px; }
  .hero-en { left: 24px; bottom: 11vh; font-size: 10px; letter-spacing: .3em; }
  .hero-roller { width: 18px; margin-left: -9px; }

  .seasons { height: 420vh; }
  .season-char { left: 20px; top: 26vh; transform: none; font-size: clamp(120px, 22vh, 180px); }
  .season-text { right: 20px; left: 20px; bottom: 12vh; max-width: none; }
  .season-text::before { display: none; }
  .season-slide::after { background: linear-gradient(to bottom, rgba(11,15,26,.45), transparent 35%, transparent 55%, rgba(11,15,26,.8)); }
  .seasons-head { left: 20px; top: 12vh; }
  .seasons-drag-hint { display: none; }

  .history { height: auto; }
  .history-stage { position: relative; height: auto; overflow: visible; padding: 12vh 0 8vh; }
  .history-head { position: relative; left: auto; top: auto; padding: 0 16px; margin-bottom: 40px; }
  .history-era-bg { display: none; }
  .timeline-track { position: relative; height: auto; flex-direction: column; align-items: stretch; gap: 26px; padding: 0 16px; transform: none !important; }
  .timeline-line { display: none; }
  .era-card { width: 100%; margin-top: 0; }
  .era-card::before, .era-dot { display: none; }
  .history-progress { display: none; }

  .axis { padding: 12vh 16px 6vh; overflow-x: clip; }
  .axis-line { left: 8px; }
  .axis-item { grid-template-columns: 1fr; gap: 18px; padding: 6vh 0 6vh 28px; }
  .axis-item:nth-child(even) .pic { order: 0; }
  .axis-item:nth-child(even) .axis-text { text-align: left; }
  .axis-item:nth-child(even) .axis-note { margin-left: 0; }
  .axis-dot { left: 8px; top: 6vh; }
  .axis-text h3 { font-size: 44px; }
  /* 移动端中轴线是竖排单列：入场改为自下浮起，
     否则 .axis-text 的 translateX(±30px) 会在动画期间把页面撑宽 14px，
     手机上滑动时会出现横向晃动（动画结束收敛为 none，所以是瞬时的） */
  .axis-text,
  .axis-item:nth-child(even) .axis-text { transform: translateY(26px); }
  .axis-item.lit .axis-text,
  .axis-item.lit:nth-child(even) .axis-text { transform: none; }

  .scenes { padding: 12vh 16px 10vh; }
  .card { width: min(100%, 320px); }
  .card:hover { --flip: 0deg; }
  .card.flipped { --flip: 180deg; }

  .day-head { padding: 0 16px; }
  .day-step { grid-template-columns: 1fr; min-height: auto; padding: 8vh 16px; gap: 24px; }
  .day-step:nth-child(even) .day-pic { order: 0; }
  .day-step:nth-child(even) .day-info { text-align: left; }
  .day-step:nth-child(even) .day-info::before { left: -16px; right: auto; }
  .day-step:nth-child(even) .day-info p { margin-left: 0; }
  .day-info::before { left: -16px; }
  .day-time { font-size: 56px; }


  .food { padding: 12vh 16px 10vh; }
  .food-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .food-card-name { font-size: 24px; }
  .food-stamps { padding: 20px 16px; }
  .food-stamps-grid { grid-template-columns: repeat(7, 1fr); gap: 6px; }
  .food-master { right: 12px; bottom: 60px; }
  .food-modal-card { grid-template-columns: 1fr; }
  .food-modal-pic { aspect-ratio: 4 / 3; min-height: 0; height: auto; }
  .food-modal-body { padding: 22px 20px 24px; }
  .opera { padding: 12vh 16px 8vh; }
  .opera-stage { grid-template-columns: 1fr; gap: 24px; }
  .opera-mask-wrap { width: min(100%, 300px); }
  .dialect { padding: 12vh 16px 8vh; }
  .exam { padding: 24px 18px 28px; }
  .exam-options { grid-template-columns: 1fr; }
  .terms { padding: 12vh 16px 8vh; }
  .terms-stage { grid-template-columns: 1fr; gap: 20px; }
  .terms-wheel-wrap { width: min(100%, 340px); }
  .terms-wheel text { font-size: 22px; }
  .terms-wheel text.active { font-size: 26px; }
  .terms-name { font-size: 48px; }
  .terms-custom { font-size: 17px; }
  .planner { padding: 12vh 16px 10vh; }
  .planner-controls { gap: 18px; }
  .plan-steps::before { left: 54px; }
  .plan-step { grid-template-columns: 44px 1fr; gap: 18px; }
  .plan-step::before { left: 50px; }
  .ending { padding: 16vh 40px 32px 16px; }
  .ending-title { font-size: 36px; }
  .ending-title .br { display: block; height: 0; }
  .ending-sub { font-size: 13px; }
  .hero-en { right: 24px; letter-spacing: .18em; font-size: 9px; }
  .credits-list { columns: 1; }
}

/* ==========================================================================
   减少动效
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .grain { animation: none; }
  .food-marquee-track { animation: none; }
  .mist { animation: none; }
  #particles { display: none; }
  .reveal, .card, .axis-text, .axis-item .pic, .axis-item .pic img { transition: none; }
}