/* ============================================
   小鸟体育综合 / Site CSS
   挂载路径：/assets/site.css
   职责：reset、变量、排版、头部、页脚、
   通用按钮、面包屑、容器、网格、基础组件
   ============================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  background: var(--light);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.7;
  letter-spacing: 0.02em;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

img {
  height: auto;
}

ul,
ol {
  list-style: none;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

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

:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
  border-radius: 3px;
  box-shadow: 0 0 0 6px rgba(0, 230, 118, 0.2);
}

/* ---------- 2. Variables ---------- */
:root {
  --green: #00E676;
  --yellow: #FFD600;
  --ink: #1A1A1A;
  --gray-dark: #333333;
  --light: #F5F5F5;
  --green-dark: #006B3F;
  --mint: #B3E5D4;
  --line: #E0E0E0;
  --white: #FFFFFF;

  --font-display: "Bebas Neue", "DIN Condensed", "Arial Narrow", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "思源黑体", -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "DIN Condensed", "Bebas Neue", "Arial Narrow", -apple-system, sans-serif;

  --text-display: clamp(2.5rem, 6vw, 5.5rem);
  --text-h1: clamp(1.8rem, 4vw, 3.2rem);
  --text-h2: clamp(1.4rem, 3vw, 2.2rem);
  --text-h3: 1.25rem;
  --text-body: 1rem;
  --text-small: 0.875rem;

  --container-w: 1280px;
  --container-pad: clamp(1rem, 4vw, 2.5rem);
  --radius: 6px;
  --radius-lg: 12px;
  --ticker-h: 36px;
  --nav-h: 52px;

  --transition: 180ms cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础排版 ---------- */
h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.02em;
}

h1 { font-size: var(--text-h1); }
h2 { font-size: var(--text-h2); }
h3 { font-size: var(--text-h3); }

p {
  overflow-wrap: break-word;
}

main {
  scroll-margin-top: calc(var(--ticker-h) + var(--nav-h) + 1rem);
}

#main-content {
  scroll-margin-top: calc(var(--ticker-h) + var(--nav-h) + 1rem);
}

/* ---------- 4. 容器与布局 ---------- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding: clamp(3rem, 7vw, 6rem) 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
  gap: 1.5rem;
}

.grid--wide {
  gap: clamp(1.5rem, 4vw, 3rem);
}

/* ---------- 5. 背景工具 ---------- */
.bg-ink {
  background: var(--ink);
  color: var(--light);
}

.bg-light {
  background: var(--light);
  color: var(--ink);
}

.bg-mint {
  background: var(--mint);
  color: var(--ink);
}

.bg-white {
  background: var(--white);
  color: var(--ink);
}

.diag-texture {
  position: relative;
}

.diag-texture::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(-45deg, transparent 0 14px, rgba(26, 26, 26, 0.04) 14px 15px);
}

.bg-ink.diag-texture::before {
  background-image: repeating-linear-gradient(-45deg, transparent 0 14px, rgba(0, 230, 118, 0.05) 14px 15px);
}

/* ---------- 6. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.75rem 1.4rem;
  font-weight: 800;
  font-size: 0.9375rem;
  letter-spacing: 0.05em;
  text-align: center;
  border: 2px solid transparent;
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform 120ms ease;
}

.btn:active {
  transform: translateY(1px);
}

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

.btn--primary:hover {
  background: #00c96b;
}

.btn--outline {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}

.btn--outline:hover {
  background: var(--ink);
  color: var(--light);
}

.btn--light-outline {
  background: transparent;
  color: var(--light);
  border-color: rgba(255, 255, 255, 0.6);
}

.btn--light-outline:hover {
  background: var(--light);
  color: var(--ink);
}

/* ---------- 7. 角标 ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  white-space: nowrap;
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  background: var(--gray-dark);
  color: var(--light);
}

.badge--new {
  background: var(--yellow);
  color: var(--ink);
}

.badge--live {
  background: var(--green);
  color: var(--ink);
}

.badge--live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink);
  animation: badge-pulse 1.6s ease-in-out infinite;
}

@keyframes badge-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.7); }
}

/* ---------- 8. 区块标题 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  margin-bottom: 2.25rem;
}

.section-head__eyebrow {
  display: block;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--green-dark);
  margin-bottom: 0.45rem;
}

.bg-ink .section-head__eyebrow {
  color: var(--green);
}

.section-head__aside {
  color: var(--gray-dark);
  font-size: var(--text-small);
  max-width: 36ch;
}

.bg-ink .section-head__aside {
  color: rgba(245, 245, 245, 0.6);
}

/* ---------- 9. 玻璃卡片 ---------- */
.glass-card {
  background: rgba(255, 255, 255, 0.55);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: calc(var(--radius) * 2);
  padding: 1.5rem;
  box-shadow: 0 8px 32px rgba(26, 26, 26, 0.08);
}

/* ---------- 10. 数据字体 ---------- */
.data-figure {
  font-family: var(--font-data);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.data-figure--green {
  color: var(--green-dark);
}

/* ---------- 11. 坐标标签 ---------- */
.coord-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-dark);
}

.coord-label::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--green);
}

.coord-label--vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.4em;
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  padding: 1rem 0;
  color: var(--gray-dark);
}

.breadcrumb__sep {
  color: var(--green-dark);
  font-weight: 700;
}

.breadcrumb a:hover {
  color: var(--green-dark);
}

.breadcrumb__current {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 13. 图片占位容器 ---------- */
.img-holder {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, #d9d9d9, #f2f2f2);
  border-radius: var(--radius);
  overflow: hidden;
}

.img-holder--tall {
  aspect-ratio: 3 / 4;
}

.img-holder--wide {
  aspect-ratio: 21 / 9;
}

.img-holder[data-caption]::after {
  content: attr(data-caption);
  position: absolute;
  right: 0.75rem;
  bottom: 0.75rem;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(26, 26, 26, 0.7);
  background: rgba(255, 255, 255, 0.6);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
}

/* ---------- 14. 图例 ---------- */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  font-size: 0.8125rem;
  color: var(--gray-dark);
}

.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.legend__swatch {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* ============================================
   15. 头部
   ============================================ */

/* skip link */
.skip-link {
  position: fixed;
  top: 0;
  left: 1rem;
  transform: translateY(-170%);
  background: var(--green);
  color: var(--ink);
  font-weight: 800;
  font-size: 0.9375rem;
  padding: 0.7rem 1.2rem;
  border-radius: 0 0 var(--radius) var(--radius);
  z-index: 1300;
  transition: transform 180ms ease;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* 阅读进度条 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--yellow);
  transform: scaleX(0);
  transform-origin: left top;
  z-index: 1200;
  pointer-events: none;
}

/* 顶部翠绿同步条 */
.header-ticker {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1100;
  background: var(--green);
  color: var(--ink);
  border-bottom: 1px solid rgba(26, 26, 26, 0.25);
}

.header-ticker__inner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: var(--ticker-h);
}

.header-ticker__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink);
  flex-shrink: 0;
}

.header-ticker__text {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.header-ticker__link {
  margin-left: auto;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  background: var(--ink);
  color: var(--green);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  transition: background 160ms ease;
}

.header-ticker__link:hover {
  background: var(--gray-dark);
}

/* 头部整体 */
.site-header {
  position: relative;
  background: var(--ink);
  color: var(--light);
  padding-top: calc(var(--ticker-h) + var(--nav-h));
  border-bottom: 4px solid var(--green);
}

/* 刊头 */
.site-header__masthead {
  position: relative;
  padding: clamp(1.25rem, 3vw, 2rem) 0 1.15rem;
  overflow: hidden;
}

.site-header__masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(-45deg, transparent 0 14px, rgba(0, 230, 118, 0.045) 14px 15px);
}

.masthead__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 2rem;
}

.masthead__coords {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(245, 245, 245, 0.55);
}

.masthead__coord-sep {
  color: var(--green);
  font-weight: 700;
}

.masthead__center {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.masthead__eyebrow {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.5em;
  text-indent: 0.5em;
  color: var(--green);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.masthead__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
}

.masthead__bird {
  width: clamp(46px, 6vw, 68px);
  height: auto;
}

.masthead__bird-wing {
  stroke: var(--green);
}

.masthead__bird-tail {
  stroke: rgba(245, 245, 245, 0.75);
}

.masthead__title {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1;
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  letter-spacing: 0.06em;
  color: var(--white);
  transition: color var(--transition);
}

.masthead__brand:hover .masthead__title {
  color: var(--green);
}

.masthead__alias {
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.42em;
  text-indent: 0.42em;
  color: rgba(245, 245, 245, 0.42);
  text-transform: uppercase;
  margin-top: 0.3rem;
}

.masthead__actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.75rem;
}

.masthead__search {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--light);
  padding: 0.5rem 0.9rem;
  border: 1px solid rgba(245, 245, 245, 0.28);
  border-radius: 999px;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.masthead__search svg {
  width: 14px;
  height: 14px;
}

.masthead__search:hover {
  border-color: var(--green);
  color: var(--green);
  background: rgba(0, 230, 118, 0.08);
}

.masthead__round {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-data);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: var(--green);
  color: var(--ink);
  padding: 0.3rem 0.55rem;
  border-radius: 4px;
}

/* 导航 */
.site-nav {
  position: fixed;
  top: var(--ticker-h);
  left: 0;
  right: 0;
  z-index: 1090;
  background: rgba(18, 18, 18, 0.92);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(245, 245, 245, 0.14);
}

.site-nav__inner {
  display: flex;
  align-items: center;
  min-height: var(--nav-h);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.15rem 1.6rem;
  flex: 1;
  counter-reset: navIndex;
}

.site-nav__item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  counter-increment: navIndex;
}

.site-nav__item::before {
  content: counter(navIndex, decimal-leading-zero);
  font-family: var(--font-data);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: rgba(0, 230, 118, 0.65);
}

.site-nav__link {
  display: block;
  position: relative;
  padding: 0.75rem 0.1rem;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: rgba(245, 245, 245, 0.78);
  transition: color var(--transition);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 4px;
  left: 0;
  height: 3px;
  background: var(--yellow);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--green);
}

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

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

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

/* 移动端菜单按钮（桌面隐藏） */
.nav-toggle {
  display: none;
}

/* ============================================
   16. 页脚
   ============================================ */
.site-footer {
  position: relative;
  background: var(--ink);
  color: var(--light);
  border-top: 4px solid var(--green);
  padding: clamp(2.5rem, 5vw, 4.5rem) 0 0;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -4px;
  right: 0;
  width: 140px;
  height: 4px;
  background: var(--yellow);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
  padding-bottom: 2.5rem;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.site-footer__bird {
  width: 58px;
  height: auto;
  margin-bottom: 0.35rem;
}

.site-footer__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3vw, 2rem);
  line-height: 1.15;
  letter-spacing: 0.08em;
  color: var(--white);
}

.site-footer__title-en {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.32em;
  text-indent: 0.32em;
  color: var(--green);
  text-transform: uppercase;
  margin-top: 0.25rem;
}

.site-footer__slogan {
  margin-top: 0.9rem;
  color: rgba(245, 245, 245, 0.62);
  font-size: 0.9375rem;
  letter-spacing: 0.03em;
}

.site-footer__trust {
  margin-top: 1.1rem;
  max-width: 38em;
  padding: 0.8rem 1rem;
  border-left: 3px solid var(--green);
  background: rgba(0, 230, 118, 0.07);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: rgba(245, 245, 245, 0.7);
}

.site-footer__columns {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.site-footer__col {
  min-width: 0;
}

.site-footer__heading {
  font-family: var(--font-data);
  font-size: 0.875rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(245, 245, 245, 0.14);
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.site-footer__links a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: rgba(245, 245, 245, 0.7);
  font-size: 0.9375rem;
  padding: 0.25rem 0;
  transition: color var(--transition);
}

.site-footer__links a::before {
  content: "→";
  font-size: 0.7rem;
  line-height: 1;
  color: var(--green);
  transition: transform 160ms ease;
}

.site-footer__links a:hover {
  color: var(--green);
}

.site-footer__links a:hover::before {
  transform: translateX(3px);
}

.site-footer__contact {
  border-top: 1px solid rgba(245, 245, 245, 0.12);
  padding: 1.4rem 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.6rem 2rem;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: rgba(245, 245, 245, 0.6);
}

.site-footer__contact-line {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  min-width: 0;
}

.site-footer__contact-label {
  flex-shrink: 0;
  color: var(--green);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.site-footer__contact-label::after {
  content: "：";
  color: var(--green);
}

.site-footer__contact a {
  color: rgba(245, 245, 245, 0.75);
  text-decoration: underline;
  text-decoration-color: rgba(0, 230, 118, 0.4);
  text-underline-offset: 3px;
  transition: color var(--transition);
}

.site-footer__contact a:hover {
  color: var(--green);
}

.site-footer__bottom {
  border-top: 1px solid rgba(245, 245, 245, 0.12);
  padding: 1.1rem 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  font-size: 0.8125rem;
  color: rgba(245, 245, 245, 0.5);
}

.site-footer__copyright {
  letter-spacing: 0.02em;
}

.site-footer__icp {
  color: rgba(245, 245, 245, 0.5);
  transition: color var(--transition);
}

.site-footer__icp:hover {
  color: var(--green);
}

/* ============================================
   17. 滚动显现
   ============================================ */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 480ms ease, transform 480ms var(--ease-out);
}

.js [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   18. 响应式
   ============================================ */
@media (max-width: 1024px) {
  .masthead__grid {
    grid-template-columns: 1fr auto;
  }

  .masthead__coords {
    display: none;
  }

  .masthead__center {
    justify-self: start;
    text-align: left;
    align-items: flex-start;
  }

  .masthead__actions {
    align-self: center;
  }
}

@media (max-width: 820px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

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

@media (max-width: 768px) {
  :root {
    --nav-h: 48px;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.75rem 0;
    color: var(--light);
  }

  .nav-toggle__label {
    font-size: 0.875rem;
    font-weight: 800;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--green);
  }

  .nav-toggle__icon {
    position: relative;
    width: 28px;
    height: 18px;
  }

  .nav-toggle__bar {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    border-radius: 2px;
    background: var(--green);
    transition: transform 220ms var(--ease-out), opacity 160ms ease;
  }

  .nav-toggle__bar:nth-child(1) { top: 1px; }
  .nav-toggle__bar:nth-child(2) { top: 8px; }
  .nav-toggle__bar:nth-child(3) { top: 15px; }

  .site-nav[data-open] .nav-toggle__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .site-nav[data-open] .nav-toggle__bar:nth-child(2) {
    opacity: 0;
  }

  .site-nav[data-open] .nav-toggle__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .site-nav[data-open] {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
    border-bottom-color: rgba(0, 230, 118, 0.5);
  }

  .site-nav__list {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 0;
    padding: 0 0 0.9rem;
    background: #121212;
  }

  .site-nav[data-open] .site-nav__list {
    display: flex;
  }

  .site-nav__item {
    display: flex;
    align-items: baseline;
    gap: 0.55rem;
    padding: 0 0.25rem;
  }

  .site-nav__item::before {
    font-size: 0.75rem;
  }

  .site-nav__link {
    flex: 1;
    padding: 0.7rem 0;
    font-size: 1rem;
    letter-spacing: 0.12em;
    border-bottom: 1px solid rgba(245, 245, 245, 0.08);
  }
}

@media (max-width: 640px) {
  .masthead__grid {
    gap: 0.75rem;
  }

  .masthead__round {
    display: none;
  }

  .masthead__search span {
    display: none;
  }

  .masthead__search {
    padding: 0.55rem;
    border-radius: 50%;
  }
}

@media (max-width: 480px) {
  .site-footer__columns {
    gap: 1.5rem;
  }

  .site-footer__contact {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   19. 减少动态偏好
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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

  .badge--live::before {
    animation: none;
  }
}