/* =========================================================
   四季指南 · 中国站 — 共享样式 /assets/site.css
   1 Reset / 2 变量 / 3 基础排版 / 4 布局 / 5 文本组件
   6 按钮标签卡片 / 7 头部 / 8 页脚 / 9 响应式 / 10 动效
   ========================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, dl, dd, figure, blockquote, fieldset { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; background: none; border: 0; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 3px solid var(--summer-orange); outline-offset: 2px; border-radius: 4px; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-green: #0E3B33;
  --ink-deep: #07231E;
  --paper: #F6F3EA;
  --card: #FFFDF6;
  --ink: #1B2320;
  --muted: #4A5754;
  --spring: #7ED0A6;
  --spring-pink: #F2B6C6;
  --summer: #2F7FA6;
  --summer-orange: #EF8A22;
  --autumn: #C98A1E;
  --autumn-brown: #8A452B;
  --winter: #C9D5DA;
  --winter-ice: #6FB6D6;

  --line: rgba(14, 59, 51, 0.16);
  --line-strong: rgba(14, 59, 51, 0.34);
  --on-dark: rgba(246, 243, 234, 0.84);
  --on-dark-strong: #F6F3EA;
  --on-dark-soft: rgba(246, 243, 234, 0.52);

  --rail-w: 240px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-paper: 0 1px 0 rgba(7, 35, 30, 0.08), 0 14px 30px -22px rgba(7, 35, 30, 0.55);
  --shadow-lift: 0 22px 44px -26px rgba(7, 35, 30, 0.62);

  --font-heading: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Source Han Mono", "Sarasa Mono SC", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(14, 59, 51, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 59, 51, 0.045) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.16;
  color: var(--ink);
}
h1 { font-size: clamp(34px, 5.4vw, 76px); }
h2 { font-size: clamp(26px, 3vw, 40px); }
h3 { font-size: 24px; line-height: 1.3; }
h4 { font-size: 20px; line-height: 1.4; }

::selection { background: var(--spring); color: var(--ink-deep); }

#main-content { display: block; scroll-margin-top: 84px; }

/* ---------- 4. 布局 ---------- */
.wrap {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 56px);
}
.section { padding-block: clamp(34px, 5.5vw, 72px); }
.section--tight { padding-block: clamp(18px, 3vw, 36px); }
.stack { display: flex; flex-direction: column; gap: clamp(14px, 2vw, 22px); }

.grid { display: grid; gap: clamp(16px, 2.2vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--main { grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); align-items: start; }

.rule { height: 1.5px; background: var(--line); border: 0; }
.rule--season {
  height: 3px;
  background: linear-gradient(90deg, var(--spring) 0 25%, var(--summer) 25% 50%, var(--autumn) 50% 75%, var(--winter-ice) 75% 100%);
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0;
}

/* ---------- 5. 文本组件 ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 500;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--summer);
}
.eyebrow::before {
  content: ""; width: 22px; height: 3px; border-radius: 2px;
  background: var(--accent, var(--summer));
}
.lede { font-size: clamp(18px, 1.6vw, 20px); line-height: 1.7; color: #3B4845; }

.note {
  font-size: 15px; line-height: 1.7; color: #42514D;
  padding-left: 14px; border-left: 3px solid var(--accent, var(--summer));
}
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: -0.01em;
}

.prose { max-width: 68ch; }
.prose p { margin-bottom: 1.05em; }
.prose h2 { margin: 1.8em 0 0.6em; }
.prose h3 { margin: 1.5em 0 0.5em; }
.prose ul, .prose ol { margin: 0 0 1.05em; padding-left: 1.2em; list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: 0.4em; }
.prose strong { font-weight: 800; }
.prose a {
  color: var(--summer); text-decoration: underline;
  text-underline-offset: 3px; text-decoration-thickness: 1.5px;
}
.prose a:hover { color: var(--summer-orange); }
.prose code {
  font-family: var(--font-mono); font-size: 0.92em;
  background: rgba(14, 59, 51, 0.07); padding: 0.1em 0.4em; border-radius: 5px;
}
.prose blockquote {
  margin: 1.5em 0; padding: 0.2em 0 0.2em 16px;
  border-left: 3px solid var(--autumn); color: #42514D;
}

.crumb {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.04em;
  color: rgba(27, 35, 32, 0.6);
}
.crumb a:hover { color: var(--summer); }
.crumb__sep { color: var(--line-strong); }

/* ---------- 6. 按钮 / 标签 / 卡片 / 图片容器 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 18px; border-radius: 10px;
  font-family: var(--font-body); font-size: 15px; font-weight: 700; letter-spacing: 0.01em;
  border: 1.5px solid transparent; text-align: center; line-height: 1.3;
  transition: transform 0.16s ease, background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn--primary { background: var(--summer-orange); color: var(--ink); border-color: rgba(7, 35, 30, 0.35); box-shadow: 0 10px 20px -14px rgba(7, 35, 30, 0.9); }
.btn--primary:hover { background: #F79A3A; }
.btn--ghost { background: transparent; color: var(--on-dark-strong); border-color: rgba(246, 243, 234, 0.42); }
.btn--ghost:hover { background: rgba(246, 243, 234, 0.12); border-color: var(--on-dark-strong); }
.btn--outline { background: transparent; color: var(--ink-green); border-color: var(--ink-green); }
.btn--outline:hover { background: var(--ink-green); color: var(--on-dark-strong); }
.btn--block { width: 100%; }

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px; border-radius: 999px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.08em;
  background: rgba(14, 59, 51, 0.06); border: 1px solid var(--line-strong); color: #3B4845;
}
.tag--spring { background: rgba(126, 208, 166, 0.26); border-color: rgba(126, 208, 166, 0.75); color: #14513A; }
.tag--summer { background: rgba(47, 127, 166, 0.16); border-color: rgba(47, 127, 166, 0.5); color: #1E5A78; }
.tag--autumn { background: rgba(201, 138, 30, 0.18); border-color: rgba(201, 138, 30, 0.6); color: #7A5210; }
.tag--winter { background: rgba(111, 182, 214, 0.2); border-color: rgba(111, 182, 214, 0.65); color: #1C5A75; }

.card {
  position: relative;
  display: flex; flex-direction: column; gap: 10px;
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--card);
  border: 1.5px solid var(--line-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-paper);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.card::before {
  content: ""; position: absolute; left: -1.5px; right: -1.5px; top: -1.5px; height: 5px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background: var(--accent, var(--summer));
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lift); }
.card__title { font-family: var(--font-heading); font-size: 20px; font-weight: 800; letter-spacing: -0.01em; line-height: 1.35; }
.card__meta { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.08em; color: rgba(27, 35, 32, 0.55); }
.card--spring { --accent: var(--spring); }
.card--summer { --accent: var(--summer); }
.card--autumn { --accent: var(--autumn); }
.card--winter { --accent: var(--winter-ice); }

.media-frame {
  position: relative; display: block; width: 100%;
  aspect-ratio: 16 / 10; overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--line-strong);
  background: linear-gradient(135deg, rgba(14, 59, 51, 0.07), rgba(14, 59, 51, 0.02));
  box-shadow: var(--shadow-paper);
}
.media-frame > img, .media-frame > svg { width: 100%; height: 100%; object-fit: cover; }
.media-frame__ph {
  position: absolute; inset: 0; display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.1em;
  color: rgba(14, 59, 51, 0.5);
  background-image: repeating-linear-gradient(45deg, rgba(14, 59, 51, 0.06) 0 8px, transparent 8px 16px);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--spring { border-top: 6px solid var(--spring); }
.media-frame--summer { border-top: 6px solid var(--summer); }
.media-frame--autumn { border-top: 6px solid var(--autumn); }
.media-frame--winter { border-top: 6px solid var(--winter-ice); }

/* ---------- 7. 头部 ---------- */
.skip-link {
  position: fixed; top: 10px; left: 10px; z-index: 200;
  transform: translateY(-180%);
  padding: 10px 16px; border-radius: 8px;
  background: var(--paper); color: var(--ink-green);
  border: 2px solid var(--ink-green);
  font-size: 15px; font-weight: 700;
  transition: transform 0.18s ease;
}
.skip-link:focus, .skip-link:focus-visible { transform: translateY(0); }

.site-header { position: relative; z-index: 60; }

.progress-track {
  position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 90;
  background: rgba(14, 59, 51, 0.14);
  pointer-events: none;
}
.progress-track__fill {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--spring) 0%, var(--summer) 38%, var(--autumn) 68%, var(--winter-ice) 100%);
  transition: width 0.12s linear;
}

.rail {
  position: fixed; top: 0; left: 0; bottom: 0; width: var(--rail-w); z-index: 70;
  display: flex; flex-direction: column; gap: 16px;
  padding: calc(22px + env(safe-area-inset-top)) 18px 20px;
  background-color: var(--ink-green);
  background-image: linear-gradient(180deg, rgba(7, 35, 30, 0) 0%, rgba(7, 35, 30, 0.62) 100%);
  color: var(--on-dark-strong);
  border-right: 3px solid var(--ink-deep);
  box-shadow: 14px 0 34px -26px rgba(7, 35, 30, 0.95);
}

.brand { display: flex; align-items: center; gap: 11px; padding: 6px; border-radius: 12px; transition: background-color 0.18s ease; }
.brand:hover { background: rgba(246, 243, 234, 0.08); }
.brand__mark {
  flex: none; width: 40px; height: 40px; border-radius: 11px;
  border: 2px solid rgba(246, 243, 234, 0.62);
  background: conic-gradient(from 45deg, var(--spring) 0 25%, var(--summer) 25% 50%, var(--autumn) 50% 75%, var(--winter-ice) 75% 100%);
  box-shadow: inset 0 0 0 3px var(--ink-green);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.2; }
.brand__name { font-family: var(--font-heading); font-weight: 800; font-size: 18px; letter-spacing: -0.01em; }
.brand__suffix { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.16em; color: var(--on-dark-soft); }

.season-track { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; padding: 0 6px; }
.season-track__seg { height: 6px; border-radius: 3px; transition: background-color 0.22s ease, transform 0.22s ease; }
.season-track__seg--spring { background: rgba(126, 208, 166, 0.3); }
.season-track__seg--summer { background: rgba(47, 127, 166, 0.36); }
.season-track__seg--autumn { background: rgba(201, 138, 30, 0.36); }
.season-track__seg--winter { background: rgba(111, 182, 214, 0.34); }
.season-track__seg.is-active { transform: scaleY(1.45); }
.season-track__seg--spring.is-active { background: var(--spring); }
.season-track__seg--summer.is-active { background: var(--summer); }
.season-track__seg--autumn.is-active { background: var(--autumn); }
.season-track__seg--winter.is-active { background: var(--winter-ice); }

.rail-nav {
  flex: 1 1 auto; display: flex; flex-direction: column; gap: 12px;
  overflow-y: auto; overflow-x: hidden; padding: 2px 0 4px;
  scrollbar-width: thin;
}
.rail-nav__head {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--on-dark-soft); padding: 0 8px;
}
.nav-list { display: flex; flex-direction: column; gap: 2px; }
.nav-item { --slot: var(--spring); }
.nav-item:nth-child(1) { --slot: var(--spring); }
.nav-item:nth-child(2) { --slot: var(--spring-pink); }
.nav-item:nth-child(3) { --slot: var(--summer); }
.nav-item:nth-child(4) { --slot: var(--summer-orange); }
.nav-item:nth-child(5) { --slot: var(--autumn); }
.nav-item:nth-child(6) { --slot: var(--winter-ice); }

.nav-link {
  position: relative;
  display: grid; grid-template-columns: 26px minmax(0, 1fr); align-items: center;
  gap: 6px 8px; padding: 9px 10px 9px 13px; border-radius: 9px;
  font-size: 15.5px; font-weight: 600; letter-spacing: 0.01em;
  color: var(--on-dark);
  transition: background-color 0.18s ease, color 0.18s ease;
}
.nav-link::before {
  content: ""; position: absolute; left: 0; top: 8px; bottom: 8px; width: 3px; border-radius: 3px;
  background: var(--slot);
  transform: scaleY(0); transform-origin: 50% 50%;
  transition: transform 0.2s ease;
}
.nav-link:hover, .nav-link:focus-visible { background: rgba(246, 243, 234, 0.09); color: var(--on-dark-strong); }
.nav-link:hover::before, .nav-link:focus-visible::before { transform: scaleY(1); }
.nav-link__index { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.04em; color: var(--on-dark-soft); }
.nav-link__label { min-width: 0; }
.nav-link__hint {
  grid-column: 1 / -1;
  max-height: 0; opacity: 0; overflow: hidden; margin: 0;
  font-size: 12.5px; font-weight: 400; line-height: 1.5; letter-spacing: 0;
  color: var(--on-dark-soft);
  transition: max-height 0.24s ease, opacity 0.24s ease, margin-top 0.24s ease;
}
.nav-link:hover .nav-link__hint,
.nav-link:focus-visible .nav-link__hint { max-height: 46px; opacity: 1; margin-top: 4px; }
.nav-link[aria-current="page"] {
  background: var(--paper); color: var(--ink-green);
  box-shadow: 0 2px 0 rgba(7, 35, 30, 0.55);
}
.nav-link[aria-current="page"]::before { transform: scaleY(1); }
.nav-link[aria-current="page"] .nav-link__index { color: var(--autumn-brown); }
.nav-link[aria-current="page"] .nav-link__hint { max-height: 46px; opacity: 1; margin-top: 4px; color: rgba(27, 35, 32, 0.68); }

.rail-nav__actions {
  display: flex; flex-direction: column; gap: 8px;
  margin-top: auto; padding-top: 14px;
}
.rail-nav__note {
  font-family: var(--font-mono); font-size: 12px; line-height: 1.6;
  color: var(--on-dark-soft); padding: 0 2px;
}
.rail__meta {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid rgba(246, 243, 234, 0.16);
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.1em;
  color: rgba(246, 243, 234, 0.46);
}

.masthead { display: none; }
.nav-toggle__bars {
  width: 16px; height: 11px; flex: none;
  background-image: linear-gradient(currentColor, currentColor),
    linear-gradient(currentColor, currentColor),
    linear-gradient(currentColor, currentColor);
  background-size: 16px 2px, 16px 2px, 11px 2px;
  background-position: 0 0, 0 4.5px, 0 9px;
  background-repeat: no-repeat;
}

.nav-scrim {
  position: fixed; inset: 0; z-index: 95;
  background: rgba(7, 35, 30, 0.58);
  opacity: 0; pointer-events: none;
  transition: opacity 0.26s ease;
}
.site-header[data-drawer="open"] .nav-scrim { opacity: 1; pointer-events: auto; }
html.is-nav-open, html.is-nav-open body { overflow: hidden; }

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: var(--ink-deep);
  color: var(--on-dark);
  padding-bottom: 26px;
}
.site-footer::before {
  content: ""; display: block; height: 6px;
  background: linear-gradient(90deg, var(--spring) 0 25%, var(--summer) 25% 50%, var(--autumn) 50% 75%, var(--winter-ice) 75% 100%);
}
.footer-top { padding-top: clamp(34px, 5vw, 58px); padding-bottom: clamp(22px, 3vw, 36px); }
.footer-grid {
  display: grid; gap: clamp(22px, 3vw, 40px);
  grid-template-columns: minmax(0, 1.6fr) repeat(4, minmax(0, 1fr));
}
.footer-col { min-width: 0; }
.footer-col__title {
  font-family: var(--font-heading); font-size: 15px; font-weight: 800; letter-spacing: 0.02em;
  color: var(--on-dark-strong);
  padding-bottom: 10px; margin-bottom: 12px;
  border-bottom: 1px solid rgba(246, 243, 234, 0.16);
}
.footer-list { display: flex; flex-direction: column; gap: 9px; }
.footer-link {
  display: inline-block; font-size: 15px; color: var(--on-dark);
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.footer-link:hover, .footer-link:focus-visible { color: var(--spring); border-bottom-color: currentColor; }

.footer-brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-heading); font-size: 19px; font-weight: 800;
  color: var(--on-dark-strong);
}
.footer-brand__mark {
  flex: none; width: 32px; height: 32px; border-radius: 9px;
  border: 2px solid rgba(246, 243, 234, 0.5);
  background: conic-gradient(from 45deg, var(--spring) 0 25%, var(--summer) 25% 50%, var(--autumn) 50% 75%, var(--winter-ice) 75% 100%);
  box-shadow: inset 0 0 0 3px var(--ink-deep);
}
.footer-about { margin-top: 14px; font-size: 15px; line-height: 1.7; max-width: 36ch; }
.footer-about--muted { margin-top: 10px; font-size: 14px; color: var(--on-dark-soft); }

.footer-contact { margin-top: 14px; display: flex; flex-direction: column; gap: 9px; }
.contact-line {
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
  font-family: var(--font-mono); font-size: 13.5px;
}
.contact-line__label { font-size: 11.5px; letter-spacing: 0.12em; color: var(--on-dark-soft); }
.contact-line__value { color: var(--on-dark-strong); word-break: break-all; }
.copy-btn {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.08em;
  padding: 2px 9px; border-radius: 999px;
  border: 1px solid rgba(246, 243, 234, 0.35); color: var(--on-dark);
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}
.copy-btn:hover { background: var(--paper); color: var(--ink-green); border-color: var(--paper); }
.copy-btn[data-copied="true"] { background: var(--spring); color: var(--ink-deep); border-color: var(--spring); }

.footer-bottom {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 22px;
  padding-top: 22px;
  border-top: 1px solid rgba(246, 243, 234, 0.14);
  font-family: var(--font-mono); font-size: 13px; line-height: 1.6;
  color: var(--on-dark-soft);
}
.footer-legal { color: var(--on-dark); }
.footer-note { margin-left: auto; }

/* ---------- 9. 响应式 ---------- */
@media (max-width: 1200px) {
  .footer-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .footer-col--brand { grid-column: 1 / -1; }
  .footer-about { max-width: 60ch; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--main { grid-template-columns: minmax(0, 1fr); }
}

@media (min-width: 1025px) {
  #main-content { padding-left: var(--rail-w); }
  .progress-track { left: var(--rail-w); }
}

@media (max-width: 1024px) {
  body { background-size: 24px 24px; }

  .masthead {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    position: sticky; top: 0; z-index: 80;
    padding: 10px 16px;
    background: var(--ink-green);
    color: var(--on-dark-strong);
    border-bottom: 3px solid var(--ink-deep);
  }
  .masthead__brand {
    display: inline-flex; align-items: baseline; gap: 8px;
    font-family: var(--font-heading); font-size: 17px; font-weight: 800; letter-spacing: -0.01em;
  }
  .masthead__suffix { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; color: var(--on-dark-soft); }
  .nav-toggle {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 8px 13px; border-radius: 9px;
    border: 1.5px solid rgba(246, 243, 234, 0.42);
    color: var(--on-dark-strong); font-size: 14px; font-weight: 700;
    transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
  }
  .nav-toggle:hover { background: rgba(246, 243, 234, 0.12); }
  .nav-toggle[aria-expanded="true"] { background: var(--paper); color: var(--ink-green); border-color: var(--paper); }

  .rail { position: static; width: auto; padding: 0; background: none; background-image: none; border: 0; box-shadow: none; display: block; }
  .brand, .season-track, .rail__meta { display: none; }

  .rail-nav {
    position: fixed; top: 0; left: 0; bottom: 0; z-index: 100;
    width: min(88vw, 340px);
    padding: calc(20px + env(safe-area-inset-top)) 16px calc(20px + env(safe-area-inset-bottom));
    background-color: var(--ink-green);
    background-image: linear-gradient(180deg, rgba(7, 35, 30, 0.12) 0%, rgba(7, 35, 30, 0.7) 100%);
    border-right: 3px solid var(--ink-deep);
    transform: translateX(-104%);
    transition: transform 0.26s ease;
    overflow-y: auto;
  }
  .rail-nav[data-open] { transform: translateX(0); }
  .rail-nav__head { padding-top: 4px; }
  .nav-link { font-size: 16.5px; padding: 12px 12px 12px 14px; }
  .nav-link__hint { max-height: 46px; opacity: 1; margin-top: 4px; }
  .rail-nav__actions { margin-top: 16px; padding-top: 14px; border-top: 1px solid rgba(246, 243, 234, 0.16); }
  .rail-nav__note { padding-bottom: 4px; }

  .footer-note { margin-left: 0; }
}

@media (max-width: 768px) {
  body { font-size: 16px; }
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-col--brand { grid-column: 1 / -1; }
  .media-frame { aspect-ratio: 4 / 3; }
  .media-frame--wide { aspect-ratio: 16 / 9; }
}

@media (max-width: 480px) {
  .wrap { padding-inline: 16px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .btn { width: 100%; }
  .footer-brand { font-size: 17px; }
}

/* ---------- 10. 动效偏好 ---------- */
html.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
html.js-reveal [data-reveal].is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  html.js-reveal [data-reveal] { opacity: 1; transform: none; }
}