/* ============================================================
   PureMind 菩而曼 · V5 样式
   设计基调：东方静奢 / 大气留白 / 克制品牌蓝
   字体：严格使用 思源宋体 CN（标题）/ 思源黑体 CN（正文）
   ============================================================ */

/* 自托管字体：思源宋体 CN（衬线）/ 思源黑体 CN（无衬线，Noto Sans SC 开源等价） */
@font-face{font-family:"Source Han Serif CN";font-style:normal;font-weight:400;font-display:swap;src:url('../assets/fonts/source-han-serif-400.woff2') format('woff2');}
@font-face{font-family:"Source Han Serif CN";font-style:normal;font-weight:600;font-display:swap;src:url('../assets/fonts/source-han-serif-600.woff2') format('woff2');}
@font-face{font-family:"Source Han Sans CN";font-style:normal;font-weight:400;font-display:swap;src:url('../assets/fonts/noto-sans-sc-400-latin.woff2') format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}
@font-face{font-family:"Source Han Sans CN";font-style:normal;font-weight:600;font-display:swap;src:url('../assets/fonts/noto-sans-sc-600-latin.woff2') format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}
@font-face{font-family:"Source Han Sans CN";font-style:normal;font-weight:400;font-display:swap;src:url('../assets/fonts/noto-sans-sc-400-cjk.woff2') format('woff2');unicode-range:U+3000-30FF,U+3400-4DBF,U+4E00-9FFF,U+F900-FAFF,U+FE30-FE4F,U+FF00-FFEF,U+20000-2A6DF,U+2A700-2B73F,U+2B740-2B81F,U+2B820-2CEAF,U+2CEB0-2EBEF,U+2F800-2FA1F;}
@font-face{font-family:"Source Han Sans CN";font-style:normal;font-weight:600;font-display:swap;src:url('../assets/fonts/noto-sans-sc-600-cjk.woff2') format('woff2');unicode-range:U+3000-30FF,U+3400-4DBF,U+4E00-9FFF,U+F900-FAFF,U+FE30-FE4F,U+FF00-FFEF,U+20000-2A6DF,U+2A700-2B73F,U+2B740-2B81F,U+2B820-2CEAF,U+2CEB0-2EBEF,U+2F800-2FA1F;}

:root {
  --ink:        #1c1813;
  --ink-soft:   #3a342c;
  --paper:      #f6f2ea;
  --paper-2:    #efe8dc;
  --paper-3:    #e7ded0;
  --muted:      #8b8175;
  --line:       rgba(28, 24, 19, 0.12);
  --brand:      #002FA7;   /* 菩蓝 · 仅关键点缀，总面积 ≤5% */
  --brand-ink:  #00237a;
  --serif: "Source Han Serif CN", serif;
  --sans:  "Source Han Sans CN", sans-serif;
  --maxw: 1180px;
  --gap:  clamp(76px, 10vw, 132px);
}

/* ---------- 语言切换 ---------- */
html.lang-zh .en { display: none; }
html.lang-en .zh { display: none; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ---------- 排版基底 ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 32px; }

.eyebrow {
  font-size: 13px; letter-spacing: 0.32em; text-transform: uppercase;
  color: var(--muted); display: flex; align-items: center; gap: 12px;
  margin: 0 0 22px; font-family: var(--sans);
}
.eyebrow .tick { width: 22px; height: 2px; background: var(--brand); display: inline-block; }

.h-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(28px, 4.4vw, 50px);
  line-height: 1.22;
  letter-spacing: 0.01em;
  margin: 0 0 26px;
  max-width: 18em;
}
.lead {
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.95;
  color: var(--ink-soft);
  text-wrap: pretty;
  max-width: 46em;
  margin: 0 0 8px;
}

/* ============================================================
   导航
   ============================================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  color: var(--paper);
  transition: background .5s ease, color .5s ease, box-shadow .5s ease;
}
.nav.scrolled {
  background: rgba(246, 242, 234, 0.88);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  color: var(--ink);
  box-shadow: 0 1px 0 var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 18px 32px;
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 11px; }
.brand .mark { width: 34px; height: auto; color: currentColor; flex: none; }
.brand-name { font-family: var(--serif); font-weight: 600; font-size: 19px; letter-spacing: 0.04em; }
.brand-name .en { font-family: var(--sans); font-size: 13px; letter-spacing: 0.18em; opacity: 0.8; margin-left: 4px; }

.nav-links { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 28px; }
.nav-center { display: flex; gap: 30px; justify-content: center; }
.nav-links a {
  position: relative; font-size: 15px; letter-spacing: 0.06em; padding: 4px 0;
  transition: color .25s ease;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 1.5px;
  background: var(--brand); transform: scaleX(0); transform-origin: left;
  transition: transform .3s ease;
}
.nav-links a:hover { color: var(--brand); }
.nav-links a:hover::after { transform: scaleX(1); }

.nav-links a.btn-nav {
  font-family: var(--sans); font-size: 14px; letter-spacing: 0.04em;
  color: var(--paper); background: transparent;
  border: 1.5px solid var(--paper); padding: 5px 15px;
  border-radius: 999px; line-height: 1.45; text-decoration: none;
  transition: background .35s ease, color .35s ease, border-color .35s ease;
}
.nav.scrolled .nav-links a.btn-nav { color: var(--brand); border-color: var(--brand); }
.nav-links a.btn-nav::after { display: none; }
.nav-links a.btn-nav:hover { color: #fff; background: var(--brand); border-color: var(--brand); }
.nav-links a.btn-nav .en { font-family: var(--sans); font-size: 11px; letter-spacing: 0.1em; opacity: .85; margin-left: 5px; }

.lang-toggle { display: flex; gap: 2px; border: 1px solid currentColor; border-radius: 999px; overflow: hidden; opacity: 0.85; }
.lang-toggle button {
  background: transparent; border: 0; color: inherit; cursor: pointer;
  font-family: var(--sans); font-size: 12px; letter-spacing: 0.14em;
  padding: 6px 12px; transition: background .25s ease, color .25s ease;
}
.lang-toggle button.active { background: var(--brand); color: #fff; }

.burger { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 6px; }
.burger span { width: 24px; height: 2px; background: currentColor; }

/* ============================================================
   首屏 Hero
   ============================================================ */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center; justify-content: center;
  text-align: center; color: var(--paper); overflow: hidden;
}
.hero-bg {
  position: absolute; top: -6%; left: 0; width: 100%; height: 112%;
  background-size: cover; background-position: center; will-change: transform;
  filter: brightness(.9) saturate(.92);
}
.hero-mask {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(18,14,10,.62) 0%, rgba(18,14,10,.42) 46%, rgba(18,14,10,.72) 100%);
}
.hero-inner { position: relative; z-index: 2; padding: 0 28px; max-width: 920px; }
.hero-eyebrow {
  font-size: 14px; letter-spacing: 0.42em; text-transform: uppercase;
  color: rgba(246,242,234,.82); margin: 0 0 30px;
}
.hero-slogan {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(2.5rem, 8.4vw, 6rem); line-height: 1.05;
  letter-spacing: 0.06em; margin: 0 0 28px; white-space: nowrap;
}
.hero-sub {
  font-size: clamp(16px, 2vw, 21px); line-height: 1.8;
  color: rgba(246,242,234,.92); margin: 0 auto 18px; max-width: 30em;
}
.hero .btn-cta { margin: 0 auto; }

.scroll-hint {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  z-index: 2; font-size: 12px; letter-spacing: 0.3em; color: rgba(246,242,234,.6);
}

/* ============================================================
   胶囊 CTA（品牌蓝）
   ============================================================ */
.btn-cta {
  display: inline-block; background: var(--brand); color: #fff;
  font-family: var(--sans); font-size: 16px; letter-spacing: 0.12em;
  padding: 16px 40px; border-radius: 999px; border: 1px solid var(--brand);
  transition: background .3s ease, transform .3s ease, box-shadow .3s ease;
  box-shadow: 0 10px 30px rgba(0,47,167,.22);
}
.btn-cta:hover { background: var(--brand-ink); transform: translateY(-2px); box-shadow: 0 16px 38px rgba(0,47,167,.3); }
.btn-cta-center { display: block; width: max-content; margin: 56px auto 0; }

/* ============================================================
   品牌溯源
   ============================================================ */
.philosophy { position: relative; padding: var(--gap) 0; overflow: hidden; }
.philosophy::before {
  content: ""; position: absolute; inset: 0;
  background: url('../assets/images/brand-wall.jpg') center/cover no-repeat;
  opacity: 0.10;
}
.philosophy::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, var(--paper) 0%, rgba(246,242,234,.86) 50%, var(--paper) 100%);
}
.philosophy .wrap { position: relative; z-index: 2; }

.triad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 64px; }
.triad-item { padding: 36px 30px; border: 1px solid var(--line); background: rgba(246,242,234,.5); }
.triad-char { font-family: var(--serif); font-weight: 600; font-size: 52px; line-height: 1; display: block; margin-bottom: 18px; color: var(--ink); }
.triad-item h3 { font-family: var(--serif); font-weight: 600; font-size: 21px; margin: 0 0 12px; letter-spacing: 0.04em; }
.triad-item p { margin: 0; color: var(--ink-soft); font-size: 15.5px; line-height: 1.85; }

.quote {
  font-family: var(--serif); font-size: clamp(20px, 2.6vw, 30px); line-height: 1.7;
  text-align: center; margin: 80px auto 0; max-width: 22em; color: var(--ink);
  text-wrap: pretty;
}
.quote .en { font-style: italic; }

/* ============================================================
   器物与境 · 三大系列（CSS 氛围，无产品图）
   ============================================================ */
.collections { padding: var(--gap) 0 0; }
.collections .wrap { padding-bottom: 40px; }

.scene {
  min-height: 80vh; display: flex; align-items: center;
  padding: 80px 32px; position: relative; overflow: hidden;
}
.scene-text { max-width: 560px; position: relative; z-index: 2; }
.scene-index { font-family: var(--serif); font-size: 15px; letter-spacing: 0.3em; opacity: 0.7; margin: 0 0 18px; }
.scene-name { font-family: var(--serif); font-weight: 600; font-size: clamp(34px, 5vw, 60px); line-height: 1.1; margin: 0 0 18px; letter-spacing: 0.04em; }
.scene-line { font-size: clamp(17px, 2vw, 22px); margin: 0 0 16px; letter-spacing: 0.03em; }
.scene-desc { font-size: 16px; line-height: 1.9; margin: 0 0 26px; max-width: 30em; }
.scene-items { list-style: none; margin: 0; padding: 0; border-top: 1px solid currentColor; }
.scene-items li { padding: 13px 0; border-bottom: 1px solid currentColor; font-size: 15.5px; letter-spacing: 0.02em; opacity: 0.92; }

.scene-warm { background: linear-gradient(155deg, #f4e8d3 0%, #ecd9bb 55%, #e2cda6 100%); color: #4a3c28; }
.scene-warm .scene-items { border-color: rgba(74,60,40,.22); }
.scene-mist { background: linear-gradient(155deg, #e6eaec 0%, #d4dde1 55%, #c3ced3 100%); color: #3c464a; }
.scene-mist .scene-items { border-color: rgba(60,70,74,.2); }
.scene-ink  { background: linear-gradient(155deg, #2c2823 0%, #1d1a15 55%, #13110d 100%); color: #ece6da; }
.scene-ink .scene-desc, .scene-ink .scene-line { color: rgba(236,230,218,.86); }
.scene-ink .scene-items { border-color: rgba(236,230,218,.22); }

.scene-glyph {
  position: absolute; right: 4%; top: 50%; transform: translateY(-50%);
  font-family: var(--serif); font-weight: 600; line-height: 1;
  font-size: clamp(180px, 28vw, 440px); white-space: nowrap;
  color: currentColor; opacity: 0.07; z-index: 1;
  pointer-events: none; user-select: none;
}

/* ============================================================
   Craft interlude（多扣全幅）
   ============================================================ */
.craft-band {
  position: relative; min-height: 58vh; display: flex; align-items: center; justify-content: center;
  text-align: center; color: var(--paper); overflow: hidden;
}
.craft-band-bg { position: absolute; inset: 0; background-size: cover; background-position: center; }
.craft-band-mask { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(18,14,10,.55), rgba(18,14,10,.62)); }
.craft-band-text { position: relative; z-index: 2; padding: 0 28px; }
.craft-band-kicker { font-size: 13px; letter-spacing: 0.4em; text-transform: uppercase; color: rgba(246,242,234,.78); margin: 0 0 16px; }
.craft-band-line { font-family: var(--serif); font-weight: 600; font-size: clamp(26px, 4vw, 46px); line-height: 1.2; margin: 0; letter-spacing: 0.04em; }

/* ============================================================
   匠心造物
   ============================================================ */
.craft { padding: var(--gap) 0; }
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin: 56px 0 60px; }
.principle { padding: 0 4px; }
.p-icon { width: 40px; height: 40px; color: var(--brand); margin-bottom: 18px; }
.principle h3 { font-family: var(--serif); font-weight: 600; font-size: 20px; margin: 0 0 10px; letter-spacing: 0.04em; }
.principle p { margin: 0; color: var(--ink-soft); font-size: 15px; line-height: 1.8; }

.bento { display: grid; grid-template-columns: repeat(4, 1fr); grid-template-rows: repeat(2, 250px); gap: 14px; }
.bento-tile { position: relative; margin: 0; overflow: hidden; background: var(--paper-3); }
.bento-tile img { width: 100%; height: 100%; object-fit: cover; transition: transform .9s ease; }
.bento-tile:hover img { transform: scale(1.04); }
.bento-a { grid-column: 1 / 3; grid-row: 1 / 3; }
.bento-b { grid-column: 3 / 5; grid-row: 1; }
.bento-c { grid-column: 3 / 4; grid-row: 2; }
.bento-d { grid-column: 4 / 5; grid-row: 2; }
.bento-tile figcaption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 22px 20px 16px;
  font-size: 14px; line-height: 1.6; color: #fff; letter-spacing: 0.02em;
  background: linear-gradient(180deg, transparent, rgba(18,14,10,.72));
}
.craft-foot { font-family: var(--serif); font-size: clamp(18px, 2.2vw, 24px); line-height: 1.7; text-align: center; margin: 60px auto 0; max-width: 24em; color: var(--ink); text-wrap: pretty; }

/* ============================================================
   体验空间（无实拍 · CSS/SVG 氛围）
   ============================================================ */
.experience { position: relative; padding: var(--gap) 0; overflow: hidden; }
.exp-aura {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(58% 48% at 18% 24%, rgba(0,47,167,.11), transparent 62%),
    radial-gradient(52% 46% at 84% 34%, rgba(0,47,167,.07), transparent 62%),
    radial-gradient(72% 62% at 50% 98%, rgba(28,24,19,.08), transparent 64%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 52%, var(--paper) 100%);
}
.exp-aura::after {
  content: ""; position: absolute; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
  opacity: 0.035; mix-blend-mode: multiply; pointer-events: none;
}
.exp-deco {
  position: absolute; z-index: 1; right: -60px; bottom: -40px;
  width: min(640px, 70vw); height: auto; color: var(--brand);
  opacity: 0.05; pointer-events: none;
}
.experience .wrap { position: relative; z-index: 2; }
.exp-note {
  display: inline-block; margin: 28px 0 0; padding: 14px 22px;
  border-left: 2px solid var(--brand); background: rgba(0,47,167,.04);
  font-size: 15.5px; line-height: 1.8; color: var(--ink-soft); max-width: 40em;
  text-wrap: pretty;
}
.exp-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 56px; border-top: 1px solid var(--line); padding-top: 56px; }
.exp-card { padding: 38px 34px; border: 1px solid var(--line); background: rgba(246,242,234,.6); }
.exp-card h3 { font-family: var(--serif); font-weight: 600; font-size: 24px; margin: 0 0 10px; letter-spacing: 0.04em; }
.exp-meta { font-size: 13.5px; letter-spacing: 0.08em; color: var(--brand); margin: 0 0 16px; }
.exp-card p:last-child { margin: 0; color: var(--ink-soft); font-size: 15.5px; line-height: 1.9; }

/* ============================================================
   知音常问
   ============================================================ */
.faq { padding: var(--gap) 0; background: var(--paper-2); }
.faq-list { margin-top: 48px; max-width: 880px; }
.faq-item { border-top: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-q {
  width: 100%; background: none; border: 0; cursor: pointer; text-align: left;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 26px 4px; font-family: var(--serif); font-weight: 600;
  font-size: clamp(17px, 2vw, 21px); color: var(--ink); line-height: 1.5;
}
.faq-plus { flex: none; font-family: var(--sans); font-size: 24px; color: var(--brand); transition: transform .3s ease; line-height: 1; }
.faq-item.open .faq-plus { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .45s ease; }
.faq-a p { margin: 0; padding: 0 4px 28px; color: var(--ink-soft); font-size: 16px; line-height: 1.95; max-width: 60em; }

/* ============================================================
   预约体验
   ============================================================ */
.contact { padding: var(--gap) 0; }
.privacy {
  max-width: 720px; margin: 0 0 64px; padding: 34px 36px;
  border: 1px solid var(--line); background: rgba(0,47,167,.03);
}
.privacy-line { font-family: var(--serif); font-weight: 600; font-size: clamp(20px, 2.4vw, 26px); margin: 0 0 14px; letter-spacing: 0.03em; }
.privacy-text { margin: 0; color: var(--ink-soft); font-size: 15.5px; line-height: 1.9; text-wrap: pretty; }

.codes { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 44px; }
.code-card { padding: 36px 34px; border: 1px solid var(--line); background: rgba(246,242,234,.6); text-align: center; }
.code-img { width: 200px; height: 200px; object-fit: contain; margin: 0 auto 22px; background: #fff; padding: 12px; border: 1px solid var(--line); }
.code-card h3 { font-family: var(--serif); font-weight: 600; font-size: 21px; margin: 0 0 10px; letter-spacing: 0.04em; }
.code-card p { margin: 0; color: var(--ink-soft); font-size: 15px; line-height: 1.8; }
.code-placeholder {
  width: 200px; height: 200px; margin: 0 auto 22px; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 14px;
  border: 1.5px dashed var(--brand); color: var(--brand); background: rgba(0,47,167,.04);
}
.code-placeholder .mark-lg { width: 56px; height: auto; }
.code-placeholder span:last-of-type { font-size: 14px; letter-spacing: 0.14em; }

/* ============================================================
   页脚
   ============================================================ */
.footer { position: relative; background: var(--ink); color: var(--paper); padding: 90px 0 56px; overflow: hidden; }
.mark-watermark { position: absolute; right: -28px; bottom: -28px; width: 360px; height: auto; color: rgba(246,242,234,.05); }
.foot-inner { position: relative; z-index: 2; max-width: var(--maxw); margin: 0 auto; padding: 0 32px; text-align: center; }
.foot-brand { display: inline-flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.foot-brand .mark { width: 40px; height: auto; color: var(--paper); }
.foot-name { font-family: var(--serif); font-weight: 600; font-size: 22px; letter-spacing: 0.05em; }
.foot-tag { font-size: 15px; letter-spacing: 0.08em; color: rgba(246,242,234,.82); margin: 0 0 14px; }
.foot-copy { font-size: 12.5px; letter-spacing: 0.06em; color: rgba(246,242,234,.5); margin: 0; }

/* ============================================================
   滚动揭示
   ============================================================ */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s ease, transform .8s ease; }
.js .reveal.in-view { opacity: 1; transform: none; }

/* 吸顶导航锚点补偿：跳转落点不被固定导航盖住 */
section[id], article[id], .scene { scroll-margin-top: 88px; }

:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 900px) {
  .triad, .principles { grid-template-columns: 1fr; }
  .bento { grid-template-columns: repeat(2, 1fr); grid-template-rows: repeat(3, 220px); }
  .bento-a { grid-column: 1 / 3; grid-row: 1; }
  .bento-b { grid-column: 1 / 3; grid-row: 2; }
  .bento-c { grid-column: 1 / 2; grid-row: 3; }
  .bento-d { grid-column: 2 / 3; grid-row: 3; }
  .exp-cards, .codes { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  body { font-size: 16px; }
  .nav-links { display: none; }
  .burger { display: flex; justify-self: end; }
  .lang-toggle { justify-self: end; }
  .nav-center { display: flex; flex-direction: column; gap: 16px; align-items: flex-start; }
  .nav-links a { color: var(--ink); }
  .nav-links a.btn-nav { color: var(--brand); border-color: var(--brand); }
  .wrap { padding: 0 22px; }
  .hero-slogan { white-space: normal; font-size: clamp(2.2rem, 11vw, 3.4rem); }
  .scene { min-height: 70vh; padding: 64px 22px; }
  .scene-glyph { display: none; }
  .bento { grid-template-columns: 1fr; grid-template-rows: repeat(4, 240px); }
  .bento-a, .bento-b, .bento-c, .bento-d { grid-column: 1; }
  .bento-a { grid-row: 1; } .bento-b { grid-row: 2; } .bento-c { grid-row: 3; } .bento-d { grid-row: 4; }
  .triad-item, .exp-card, .code-card { padding: 28px 24px; }
}

/* ============================================================
   无障碍：尊重系统「减少动态」偏好
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1 !important; transform: none !important; }
  html { scroll-behavior: auto; }
}