/* =========================================================
   /assets/site.css — 四季主页 共享样式
   纸米白 · 浅沙 · 墨黑 + 春夏秋冬四色刻度
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

html.is-nav-open { overflow: hidden; }

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, pre { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

img, svg, video { display: block; max-width: 100%; }

button, input, select, textarea { font: inherit; color: inherit; }

button { background: none; border: 0; padding: 0; cursor: pointer; }

a { color: inherit; text-decoration: none; }

::selection { background: #8FBF7A; color: #1C1B17; }

/* ---------- 2. Tokens ---------- */
:root {
  /* 纸与墨 */
  --paper: #F8F4EA;
  --sand: #E8E0D0;
  --ink: #1C1B17;
  --ink-2: #2B2924;
  --focus: #11100E;

  /* 四季 */
  --spring: #8FBF7A;
  --spring-deep: #3F6B3B;
  --summer: #F26A4B;
  --summer-deep: #B43B25;
  --autumn: #D99A2B;
  --autumn-deep: #805510;
  --winter: #8FB3C2;
  --winter-deep: #355A6B;

  /* 线条与透明层 */
  --line: rgba(28, 27, 23, 0.16);
  --line-soft: rgba(28, 27, 23, 0.08);
  --line-light: rgba(248, 244, 234, 0.16);
  --ink-70: rgba(28, 27, 23, 0.7);
  --ink-55: rgba(28, 27, 23, 0.55);
  --paper-80: rgba(248, 244, 234, 0.8);

  /* 字体 */
  --font-display: "Source Han Serif SC", "Noto Serif SC", "Songti SC", Georgia, serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  /* 度量 */
  --wrap: 1280px;
  --gutter: clamp(18px, 4vw, 48px);
  --sp: clamp(48px, 6vw, 96px);
  --t: 180ms;
  --radius-cut: 20px;
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.05vw, 17.5px);
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--ink);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(32px, 5vw, 64px); font-weight: 900; }
h2 { font-size: clamp(24px, 3vw, 38px); }
h3 { font-size: clamp(19px, 1.7vw, 24px); }

p, li { text-wrap: pretty; }

strong, b { font-weight: 700; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 1px;
}

/* ---------- 4. 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

#main-content { display: block; }

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 10px 20px;
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  letter-spacing: 0.08em;
  border: 1px solid var(--ink);
  transform: translateY(-200%);
  transition: transform var(--t) ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 3px solid var(--summer);
  outline-offset: 2px;
}

/* ---------- 6. 按钮 ---------- */
.btn {
  --btn-bg: var(--paper);
  --btn-fg: var(--ink);
  --btn-bd: var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.2;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 11px), calc(100% - 11px) 100%, 0 100%);
  transition: background-color var(--t) ease, color var(--t) ease,
              border-color var(--t) ease, transform var(--t) ease;
}

.btn:hover {
  --btn-bg: var(--ink);
  --btn-fg: var(--paper);
  --btn-bd: var(--ink);
  transform: translateY(-1px);
}

.btn:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 3px var(--focus);
}

.btn--season {
  --btn-bg: var(--summer);
  --btn-fg: #1C1B17;
  --btn-bd: var(--summer);
  font-weight: 700;
}

.btn--season:hover {
  --btn-bg: var(--ink);
  --btn-fg: var(--paper);
  --btn-bd: var(--ink);
}

.btn--season:focus-visible {
  box-shadow: inset 0 0 0 3px var(--focus), inset 0 0 0 5px var(--paper);
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  --btn-bd: var(--ink);
}

/* ---------- 7. 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  color: var(--ink);
  background: linear-gradient(
    180deg,
    rgba(248, 244, 234, 0.94) 0%,
    rgba(248, 244, 234, 0.62) 62%,
    rgba(248, 244, 234, 0) 100%
  );
  border-bottom: 1px solid transparent;
  transition: background-color var(--t) ease, border-color var(--t) ease,
              box-shadow var(--t) ease;
}

.site-header.is-stuck {
  background: rgba(248, 244, 234, 0.98);
  border-bottom-color: var(--line);
  box-shadow: 0 10px 26px -24px rgba(17, 16, 14, 0.75);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 26px);
  max-width: var(--wrap);
  min-height: 76px;
  margin-inline: auto;
  padding: 12px var(--gutter);
}

/* 品牌署名 */
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--ink);
  text-decoration: none;
}

.brand__mark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.1vw, 26px);
  letter-spacing: 0.16em;
  line-height: 1;
}

.brand__latin {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.34em;
  color: var(--ink);
  opacity: 0.6;
}

.brand:hover .brand__latin { opacity: 1; color: var(--summer-deep); }

.site-header__rule {
  width: 1px;
  height: 22px;
  background: var(--line);
  flex: 0 0 auto;
}

.site-header__tagline {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--ink-70);
  white-space: nowrap;
}

.site-header__actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* 索引（移动端）按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  font-size: 13px;
  letter-spacing: 0.14em;
  line-height: 1;
  transition: background-color var(--t) ease, color var(--t) ease;
}

.nav-toggle:hover { background: var(--ink); color: var(--paper); }

.nav-toggle:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 3px var(--focus);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background-color var(--t) ease;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--t) ease;
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.nav-toggle__text {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
}

/* ---------- 8. 导航：桌面端右缘纵向季节刻度 ---------- */
.site-nav {
  position: fixed;
  right: clamp(10px, 1.2vw, 22px);
  top: 50%;
  transform: translateY(-50%);
  z-index: 88;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  padding: 8px 0;
}

.site-nav__heading {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.34em;
  color: var(--ink);
  opacity: 0.42;
  padding-right: 10px;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
}

.site-nav__item { display: block; }

.site-nav__link {
  --season: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 10px;
  background: rgba(248, 244, 234, 0.92);
  border: 1px solid var(--line-soft);
  color: var(--ink);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  line-height: 1.35;
  transition: transform var(--t) ease, background-color var(--t) ease,
              color var(--t) ease, border-color var(--t) ease;
}

.site-nav__link::before {
  content: "";
  width: 3px;
  height: 14px;
  background: var(--season);
  flex: 0 0 auto;
}

.site-nav__link[data-season="spring"] { --season: var(--spring-deep); }
.site-nav__link[data-season="summer"] { --season: var(--summer-deep); }
.site-nav__link[data-season="autumn"] { --season: var(--autumn-deep); }
.site-nav__link[data-season="winter"] { --season: var(--winter-deep); }

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  opacity: 0.55;
}

.site-nav__label { white-space: nowrap; }

.site-nav__link:hover,
.site-nav__link:focus-visible {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
  transform: translateX(-4px);
}

.site-nav__link:hover .site-nav__num,
.site-nav__link:focus-visible .site-nav__num { opacity: 0.85; }

.site-nav__link[aria-current="page"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.site-nav__link[aria-current="page"]::before { background: var(--season); }
.site-nav__link[aria-current="page"] .site-nav__num { opacity: 1; }

/* ---------- 9. 阅读进度条 ---------- */
.progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: transparent;
  pointer-events: none;
}

.progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--spring) 0%,
    var(--summer) 38%,
    var(--autumn) 68%,
    var(--winter) 100%
  );
  transition: width 90ms linear;
}

/* ---------- 10. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: var(--sp);
  background: var(--ink);
  color: var(--paper);
}

.site-footer::before {
  content: "";
  display: block;
  height: 5px;
  background: linear-gradient(
    90deg,
    var(--spring) 0 25%,
    var(--summer) 25% 50%,
    var(--autumn) 50% 75%,
    var(--winter) 75% 100%
  );
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.55fr 0.8fr 0.8fr 1.3fr;
  gap: clamp(24px, 4vw, 56px);
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 80px) var(--gutter) clamp(30px, 4vw, 52px);
}

.site-footer__mark {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 24px;
  letter-spacing: 0.16em;
  color: var(--paper);
}

.site-footer__mark:hover { color: var(--spring); }

.site-footer__mark-latin {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.32em;
  color: var(--spring);
}

.site-footer__tagline {
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: rgba(248, 244, 234, 0.6);
}

.site-footer__summary {
  margin-top: 16px;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(248, 244, 234, 0.78);
}

.season-scale {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.season-scale__item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(248, 244, 234, 0.82);
  border: 1px solid rgba(248, 244, 234, 0.22);
}

.season-scale__num {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  opacity: 0.6;
}

.season-scale__item:nth-child(1) { border-color: rgba(143, 191, 122, 0.6); }
.season-scale__item:nth-child(2) { border-color: rgba(242, 106, 75, 0.6); }
.season-scale__item:nth-child(3) { border-color: rgba(217, 154, 43, 0.6); }
.season-scale__item:nth-child(4) { border-color: rgba(143, 179, 194, 0.6); }

.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.28em;
  color: rgba(248, 244, 234, 0.5);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 11px;
}

.footer-col__link {
  display: inline-block;
  font-size: 15px;
  color: rgba(248, 244, 234, 0.86);
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--t) ease, border-color var(--t) ease;
}

.footer-col__link:hover,
.footer-col__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--autumn);
}

.footer-col__link:focus-visible { outline: 3px solid var(--paper); outline-offset: 3px; }

.footer-contact__list {
  display: grid;
  gap: 12px;
}

.footer-contact__row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 14px;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: rgba(248, 244, 234, 0.45);
}

.footer-contact__value {
  color: rgba(248, 244, 234, 0.92);
  word-break: break-word;
}

.footer-contact__note {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 2px solid var(--winter);
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(248, 244, 234, 0.55);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 18px var(--gutter) 30px;
  border-top: 1px solid var(--line-light);
  font-size: 12.5px;
  color: rgba(248, 244, 234, 0.6);
}

.footer-legal__copy { margin: 0; letter-spacing: 0.06em; }

.footer-legal__icp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: rgba(248, 244, 234, 0.5);
}

.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-left: auto;
}

.footer-legal__link {
  color: rgba(248, 244, 234, 0.74);
  border-bottom: 1px solid rgba(248, 244, 234, 0.3);
  padding-bottom: 1px;
  transition: color var(--t) ease, border-color var(--t) ease;
}

.footer-legal__link:hover,
.footer-legal__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--spring);
}

.footer-legal__link:focus-visible { outline: 3px solid var(--paper); outline-offset: 3px; }

/* ---------- 11. 通用章节与栅格 ---------- */
.section { padding-block: var(--sp); }
.section--sand { background: var(--sand); }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  margin-bottom: clamp(22px, 3vw, 36px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.28em;
  color: var(--ink);
  opacity: 0.55;
}

.grid {
  display: grid;
  gap: clamp(18px, 2.4vw, 32px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.grid--split {
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  align-items: start;
}

/* ---------- 12. 季节标签 ---------- */
.season-tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  border: 1px solid currentColor;
  color: var(--spring-deep);
  background: rgba(143, 191, 122, 0.16);
}

.season-tag--spring { color: var(--spring-deep); background: rgba(143, 191, 122, 0.16); }
.season-tag--summer { color: var(--summer-deep); background: rgba(242, 106, 75, 0.14); }
.season-tag--autumn { color: var(--autumn-deep); background: rgba(217, 154, 43, 0.16); }
.season-tag--winter { color: var(--winter-deep); background: rgba(143, 179, 194, 0.18); }

/* ---------- 13. 卡片与面板 ---------- */
.card {
  --season: var(--ink);
  position: relative;
  display: block;
  padding: clamp(18px, 2.2vw, 30px);
  background: var(--paper);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--radius-cut)),
    calc(100% - var(--radius-cut)) 100%,
    0 100%
  );
  transition: transform var(--t) ease, box-shadow var(--t) ease;
}

.card:hover,
.card:focus-within {
  transform: translateY(-3px);
  box-shadow: inset 0 0 0 1px var(--season);
}

.card__index {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--ink-55);
}

.card__title {
  font-family: var(--font-display);
  font-size: clamp(18px, 1.6vw, 22px);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.02em;
}

.card__text {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-70);
}

.panel-cut {
  padding: clamp(20px, 3vw, 36px);
  background: var(--paper);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 30px),
    calc(100% - 30px) 100%,
    0 100%
  );
}

/* ---------- 14. 图文容器（供页面放图） ---------- */
.media {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  background: var(--sand);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(28, 27, 23, 0.12);
}

.media__img,
.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }

.media--cut {
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 24px),
    calc(100% - 24px) 100%,
    0 100%
  );
}

.media--plate {
  background:
    radial-gradient(circle at 22% 26%, rgba(248, 244, 234, 0.55) 0 14%, transparent 42%),
    linear-gradient(135deg, var(--spring) 0%, var(--summer) 44%, var(--autumn) 72%, var(--winter) 100%);
}

.media__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--ink-55);
}

/* ---------- 15. 长文 ---------- */
.prose {
  max-width: 720px;
  font-size: 17px;
  line-height: 1.85;
}

.prose > * + * { margin-top: 1.1em; }

.prose h2 {
  margin-top: 2.2em;
  font-size: clamp(22px, 2.2vw, 30px);
}

.prose h3 { margin-top: 1.8em; }

.prose ul,
.prose ol {
  padding-left: 1.4em;
  list-style: disc;
}

.prose ol { list-style: decimal; }

.prose li + li { margin-top: 0.5em; }

.prose a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.prose a:hover { color: var(--summer-deep); }

.prose blockquote {
  padding-left: 18px;
  border-left: 3px solid var(--autumn);
  font-family: var(--font-display);
  color: rgba(28, 27, 23, 0.78);
}

.note {
  padding: 8px 0 8px 16px;
  border-left: 2px solid var(--winter);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(28, 27, 23, 0.72);
}

/* ---------- 16. 面包屑 ---------- */
.crumbs {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-55);
}

.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.crumbs__item + .crumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(28, 27, 23, 0.32);
}

.crumbs__link {
  border-bottom: 1px solid transparent;
  transition: color var(--t) ease, border-color var(--t) ease;
}

.crumbs__link:hover {
  color: var(--ink);
  border-bottom-color: currentColor;
}

.crumbs__current { color: var(--ink); }

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1100px) {
  .site-header__tagline { display: none; }
  .site-header__rule { display: none; }
}

@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    top: 0;
    right: 0;
    bottom: 0;
    width: min(86vw, 340px);
    transform: translateX(101%);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 92px 22px 36px;
    background: var(--paper);
    border-left: 1px solid var(--line);
    box-shadow: -26px 0 52px -34px rgba(17, 16, 14, 0.6);
    overflow-y: auto;
    transition: transform 220ms ease;
  }

  .site-header[data-open] .site-nav { transform: translateX(0); }

  .site-nav__heading {
    padding: 0 4px 14px;
    border-bottom: 1px solid var(--line);
    text-align: left;
  }

  .site-nav__list {
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    width: 100%;
    justify-content: flex-start;
    gap: 12px;
    padding: 15px 4px;
    background: transparent;
    border: 0;
    border-bottom: 1px solid var(--line-soft);
    font-size: 16px;
    letter-spacing: 0.04em;
  }

  .site-nav__link:hover,
  .site-nav__link:focus-visible {
    transform: none;
    background: var(--sand);
    color: var(--ink);
  }

  .site-nav__link[aria-current="page"] {
    background: var(--ink);
    color: var(--paper);
    border-bottom-color: var(--ink);
    padding-inline: 12px;
  }

  .site-nav__link::before { width: 4px; height: 18px; }

  .site-footer__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .grid--2,
  .grid--3,
  .grid--split { grid-template-columns: minmax(0, 1fr); }

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

@media (max-width: 640px) {
  .site-header__inner { min-height: 68px; padding-block: 10px; }

  .site-header__actions .btn--season {
    padding: 9px 13px;
    font-size: 12.5px;
    letter-spacing: 0.04em;
  }

  .nav-toggle { padding: 9px 11px; }

  .site-heading, .section { --sp: 44px; }

  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
  }

  .site-footer__legal { padding-bottom: 34px; }

  .footer-legal__links {
    width: 100%;
    gap: 14px;
  }
}

/* ---------- 18. 减弱动效 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .card:hover,
  .card:focus-within,
  .site-nav__link:hover,
  .site-nav__link:focus-visible,
  .btn:hover {
    transform: none;
  }
}