/* =========================================================
   互博赛场 · 共享样式表  /assets/site.css
   墨绿底 + 暖砂白阅读面 + 铜金锚点 + 信号橙交互
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

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

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

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; }

table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --ink-green: #0F2A22;
  --ink-green-soft: #16352B;
  --charcoal: #101613;
  --copper: #B8863B;
  --copper-light: #D8A65C;
  --signal: #E2662C;
  --sand: #F4EEE4;
  --paper: #FCFAF6;
  --moss: #6C7A72;
  --jade: #DDE7DF;
  --kraft: #E6DAC6;

  --line: rgba(16, 22, 19, 0.14);
  --line-soft: rgba(16, 22, 19, 0.08);
  --line-strong: rgba(16, 22, 19, 0.30);
  --line-dark: rgba(244, 238, 228, 0.18);
  --text-on-dark: rgba(244, 238, 228, 0.78);
  --text-on-dark-dim: rgba(244, 238, 228, 0.58);

  --font-display: "PingFang SC", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Songti SC", "Source Han Serif SC", "Noto Serif SC", "Songti TC", Georgia, serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --gutter: clamp(20px, 4vw, 48px);
  --shell: 1240px;

  --s1: 24px;
  --s2: 40px;
  --s3: 64px;
  --s4: 96px;

  --r-lg: 28px;
  --r-md: 18px;
  --r-sm: 12px;
  --r-pill: 999px;

  --shadow-1: 0 1px 0 rgba(16, 22, 19, 0.04), 0 10px 26px -20px rgba(16, 22, 19, 0.55);
  --shadow-2: 0 20px 44px -28px rgba(16, 22, 19, 0.6);

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 160ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--sand);
  color: var(--charcoal);
  font-family: var(--font-body);
  font-size: clamp(17px, 0.55vw + 15px, 19.5px);
  line-height: 1.9;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  font-stretch: condensed;
  color: var(--ink-green);
  text-wrap: balance;
}

h1 { font-size: clamp(32px, 6vw, 88px); font-weight: 900; }
h2 { font-size: clamp(26px, 3.2vw, 44px); }
h3 { font-size: clamp(20px, 1.6vw, 26px); font-weight: 700; }
h4 { font-size: clamp(17px, 1.1vw, 20px); font-weight: 700; }

p {
  max-width: 34em;
  text-wrap: pretty;
}

p + p { margin-top: 1.2em; }

a {
  color: var(--ink-green);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

a:hover { color: var(--copper); }

strong { font-weight: 700; color: var(--ink-green); }

small { font-size: 0.82em; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: var(--s2) 0;
}

/* 焦点反馈 */
:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 3px;
  border-radius: 6px;
}

.site-header :focus-visible,
.site-footer :focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 2px;
  border-radius: var(--r-pill);
}

/* ---------- 4. 无障碍工具 ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -80px;
  z-index: 200;
  display: inline-block;
  padding: 12px 22px;
  border-radius: 0 0 var(--r-md) var(--r-md);
  background-color: var(--ink-green);
  color: var(--sand);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus {
  top: 0;
  color: var(--paper);
}

/* ---------- 5. 阅读进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 140;
  pointer-events: none;
  background-color: transparent;
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background-color: var(--copper);
  transition: width 80ms linear;
}

/* ---------- 6. 站点头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  isolation: isolate;
}

/* 6.1 品牌层 */
.header-brand {
  background-color: var(--ink-green);
  color: var(--sand);
  border-bottom: 1px solid rgba(184, 134, 59, 0.28);
}

.header-brand__inner {
  width: min(var(--shell), 100% - var(--gutter) * 2);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 36px);
  min-height: 66px;
  padding-block: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: var(--sand);
}

.brand:hover { color: var(--sand); }

.brand__mark {
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: var(--r-sm);
  background-color: var(--copper);
  color: var(--ink-green);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 900;
  line-height: 1;
  transform: rotate(-2deg);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.25;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--copper-light);
}

.header-week {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 15px;
  border: 1px solid rgba(216, 166, 92, 0.36);
  border-radius: var(--r-pill);
  background-color: rgba(184, 134, 59, 0.12);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--copper-light);
  white-space: nowrap;
  max-width: none;
}

.header-week__dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background-color: var(--signal);
}

/* 6.2 移动导航按钮 */
.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 9px;
  padding: 9px 16px;
  border: 1px solid rgba(216, 166, 92, 0.5);
  border-radius: var(--r-pill);
  color: var(--sand);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}

.nav-toggle:hover {
  background-color: rgba(184, 134, 59, 0.24);
  color: var(--paper);
}

.nav-toggle[aria-expanded="true"] {
  background-color: var(--signal);
  border-color: var(--signal);
  color: var(--paper);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
  flex: 0 0 auto;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  transform: translateY(4px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  transform: translateY(-4px) rotate(-45deg);
}

.nav-toggle__label { line-height: 1; }

/* 6.3 栏目层 */
.site-nav {
  background-color: var(--sand);
  border-bottom: 1px solid var(--line);
}

.site-nav__list {
  width: min(var(--shell), 100% - var(--gutter) * 2);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 6px;
  padding-block: 10px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}

.site-nav__list::-webkit-scrollbar { display: none; }

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  color: var(--charcoal);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 5px;
  height: 2px;
  border-radius: 2px;
  background-color: var(--copper);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.site-nav__link:hover {
  background-color: var(--jade);
  color: var(--ink-green);
}

.site-nav__link:hover::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] {
  background-color: var(--paper);
  border-color: rgba(184, 134, 59, 0.55);
  color: var(--ink-green);
}

.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 50%;
  width: 3px;
  height: 16px;
  border-radius: 2px;
  background-color: var(--signal);
  transform: translateY(-50%);
}

.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

/* ---------- 7. 站点页脚 ---------- */
.site-footer {
  position: relative;
  background-color: var(--ink-green);
  color: var(--sand);
}

.site-footer::before {
  content: "";
  display: block;
  height: 6px;
  background-image: linear-gradient(
    90deg,
    var(--copper) 0 34%,
    var(--kraft) 34% 66%,
    var(--signal) 66% 100%
  );
}

.site-footer__inner {
  width: min(var(--shell), 100% - var(--gutter) * 2);
  margin-inline: auto;
  padding-block: var(--s3) var(--s1);
}

.site-footer a { color: var(--sand); }
.site-footer a:hover { color: var(--copper-light); }

.footer-masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 28px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--line-dark);
}

.footer-masthead__name {
  font-family: var(--font-display);
  font-size: clamp(24px, 2.6vw, 34px);
  font-weight: 900;
  letter-spacing: 0.03em;
  color: var(--paper);
  max-width: none;
}

.footer-masthead__meta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--copper-light);
  max-width: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(28px, 4vw, 56px);
  padding-block: var(--s2);
}

.footer-block { min-width: 0; }

.footer-block__title {
  margin-bottom: 18px;
  font-family: var(--font-display);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--copper-light);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  font-family: var(--font-display);
  font-size: 15px;
}

.footer-list--split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px 22px;
}

.footer-list a {
  display: inline-block;
  padding-block: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-list a:hover { border-bottom-color: var(--copper-light); }

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 15px;
}

.footer-contact__row {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-contact__key {
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--text-on-dark-dim);
}

.footer-contact__value {
  margin: 0;
  color: var(--sand);
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.footer-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 15px;
  color: var(--text-on-dark);
}

.footer-meta__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  max-width: none;
}

.footer-meta__key {
  min-width: 6em;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--text-on-dark-dim);
}

.footer-link {
  border-bottom: 1px solid rgba(216, 166, 92, 0.5);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-link:hover { border-bottom-color: var(--paper); }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--text-on-dark-dim);
}

.footer-base p { max-width: none; }

/* ---------- 8. 布局容器与网格 ---------- */
.shell {
  width: min(var(--shell), 100% - var(--gutter) * 2);
  margin-inline: auto;
}

.shell--narrow {
  width: min(820px, 100% - var(--gutter) * 2);
  margin-inline: auto;
}

.section { padding-block: var(--s3); }
.section--tight { padding-block: var(--s2); }
.section--wide { padding-block: var(--s4); }

.grid {
  display: grid;
  gap: var(--s2);
  align-items: start;
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--5-7 { grid-template-columns: 5fr 7fr; }
.grid--7-5 { grid-template-columns: 7fr 5fr; }
.grid--4-8 { grid-template-columns: 4fr 8fr; }

/* ---------- 9. 章节头与注释 ---------- */
.section-head {
  display: grid;
  grid-template-columns: 4fr 8fr;
  gap: clamp(18px, 3vw, 48px);
  align-items: start;
  padding-bottom: var(--s2);
  margin-bottom: var(--s2);
  border-bottom: 1px solid var(--line);
}

.section-head__index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--copper);
  max-width: none;
}

.section-head__title {
  font-size: clamp(26px, 3vw, 40px);
}

.section-head__note {
  margin-top: 12px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--moss);
}

.annotation-vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.24em;
  line-height: 1;
  color: var(--moss);
  white-space: nowrap;
}

.annotation-rotate {
  display: inline-block;
  transform: rotate(-90deg);
  transform-origin: left bottom;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.2em;
  color: var(--moss);
  white-space: nowrap;
}

/* ---------- 10. 面板与卡片 ---------- */
.panel {
  padding: clamp(22px, 3vw, 36px);
  background-color: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
  transition: box-shadow var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.panel:hover {
  border-color: rgba(184, 134, 59, 0.45);
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.panel--flat:hover { transform: none; }

.panel--dark {
  background-color: var(--ink-green);
  border-color: transparent;
  color: var(--sand);
}

.panel--dark h2,
.panel--dark h3,
.panel--dark h4 { color: var(--paper); }

.panel--kraft {
  background-color: var(--kraft);
  border-color: rgba(184, 134, 59, 0.35);
}

/* ---------- 11. 标签与胶囊 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 13px;
  border-radius: var(--r-pill);
  background-color: var(--jade);
  color: var(--ink-green);
  font-family: var(--font-display);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.6;
}

.tag--copper {
  background-color: rgba(184, 134, 59, 0.16);
  color: var(--copper);
}

.tag--signal {
  background-color: rgba(226, 102, 44, 0.14);
  color: var(--signal);
}

.tag--outline {
  background-color: transparent;
  border: 1px solid var(--line-strong);
  color: var(--moss);
}

/* ---------- 12. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  border: 1.5px solid var(--charcoal);
  border-radius: var(--r-pill);
  background-color: transparent;
  color: var(--charcoal);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.4;
  text-decoration: none;
  transition: background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.btn:hover {
  background-color: var(--ink-green);
  border-color: var(--ink-green);
  color: var(--sand);
  transform: translateY(-1px);
}

.btn--primary {
  background-color: var(--ink-green);
  border-color: var(--ink-green);
  color: var(--sand);
}

.btn--primary:hover {
  background-color: var(--signal);
  border-color: var(--signal);
  color: var(--paper);
}

.btn--copper {
  border-color: var(--copper);
  color: var(--copper);
}

.btn--copper:hover {
  background-color: var(--copper);
  border-color: var(--copper);
  color: var(--ink-green);
}

.btn--ghost-on-dark {
  border-color: rgba(244, 238, 228, 0.4);
  color: var(--sand);
}

.btn--ghost-on-dark:hover {
  background-color: var(--sand);
  border-color: var(--sand);
  color: var(--ink-green);
}

.btn--sm {
  padding: 9px 18px;
  font-size: 14px;
}

/* ---------- 13. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--moss);
}

.breadcrumbs a { color: var(--moss); }
.breadcrumbs a:hover { color: var(--copper); }

.breadcrumbs__sep {
  color: var(--copper);
  user-select: none;
}

.breadcrumbs [aria-current="page"] { color: var(--ink-green); }

/* ---------- 14. 索引条 ---------- */
.index-bar {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.index-bar__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 10px;
  border-bottom: 1px solid var(--line);
  color: var(--charcoal);
  transition: background-color var(--dur) var(--ease),
              padding-left var(--dur) var(--ease);
}

.index-bar__item:hover {
  background-color: var(--paper);
  padding-left: 18px;
  color: var(--charcoal);
}

.index-bar__no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--copper);
}

.index-bar__label {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.index-bar__path {
  margin-left: auto;
  max-width: 0;
  overflow: hidden;
  opacity: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--moss);
  white-space: nowrap;
  transition: opacity var(--dur) var(--ease),
              max-width var(--dur) var(--ease),
              color var(--dur) var(--ease);
}

.index-bar__item:hover .index-bar__path,
.index-bar__item:focus-visible .index-bar__path {
  max-width: 24ch;
  opacity: 1;
  color: var(--copper);
}

@media (hover: none) {
  .index-bar__path { max-width: 24ch; opacity: 1; }
}

/* ---------- 15. 横向时间轴 ---------- */
.timeline {
  display: flex;
  gap: 0;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  padding-bottom: 12px;
  scroll-snap-type: x proximity;
}

.timeline__item {
  position: relative;
  flex: 0 0 clamp(220px, 26vw, 300px);
  padding: 30px 24px 0 0;
  scroll-snap-align: start;
}

.timeline__item::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--kraft);
}

/* ---------- 16. 数字与等宽 ---------- */
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13.5px;
  letter-spacing: 0.02em;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--copper);
}

/* ---------- 17. 图片占位容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background-color: var(--jade);
}

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

.media--square { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--paper { background-color: var(--paper); }
.media--kraft { background-color: var(--kraft); }

.media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--moss);
  max-width: none;
}

.media-frame {
  padding: 10px;
  background-color: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
}

.media-frame .media { border: 0; }

/* ---------- 18. 显现动效 ---------- */
.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}

.js-ready [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 19. 响应式 ---------- */
@media (max-width: 1040px) {
  .header-week { display: none; }
}

@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }

  .site-nav { display: none; }

  .site-nav[data-open] {
    display: block;
    border-top: 1px solid var(--line-soft);
  }

  .site-nav[data-open] .site-nav__list {
    flex-wrap: nowrap;
    padding-block: 12px;
  }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section-head { grid-template-columns: minmax(0, 1fr); gap: 14px; }
}

@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--5-7,
  .grid--7-5,
  .grid--4-8 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 680px) {
  :root { --s3: 48px; --s4: 64px; }

  .brand__mark { width: 34px; height: 34px; font-size: 16px; }
  .brand__name { font-size: 17px; }
  .brand__tagline { font-size: 11px; letter-spacing: 0.08em; }

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

  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-list--split { grid-template-columns: minmax(0, 1fr); }
  .footer-base { flex-direction: column; align-items: flex-start; }

  .panel { border-radius: var(--r-md); }
  .media { aspect-ratio: 4 / 3; }
}

/* ---------- 20. 降低动效 ---------- */
@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;
  }

  .js-ready [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .panel:hover,
  .btn:hover { transform: none; }
}