/* ==========================================================
   大江体育 · 数据竞技展览馆 共享样式
   文件位置：/assets/site.css
   ========================================================== */

/* ---------- 1. 设计变量与基础重置 ---------- */
:root {
  --color-bg: #0A1128;
  --color-panel: #121A33;
  --color-deep: #070D1F;
  --color-accent: #FF6B2C;
  --color-lime: #B6FF3A;
  --color-alert: #FF3860;
  --color-text: #F4F6FF;
  --color-muted: #8A93B5;
  --color-gold: #F5C46B;
  --scanline: rgba(182, 255, 58, 0.15);
  --font-heading: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "Roboto Mono", "SF Mono", "Cascadia Mono", Consolas, monospace;
  --container-w: 1280px;
  --header-h: 76px;
  --space-section: clamp(4rem, 9vw, 7.5rem);
  --skew: -6deg;
  --ease-cubic: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

body {
  margin: 0;
  overflow-x: hidden;
  background-color: var(--color-bg);
  background-image:
    linear-gradient(to right, rgba(182, 255, 58, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(182, 255, 58, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.8em;
  color: var(--color-text);
  font-family: var(--font-heading);
  font-weight: 900;
  font-style: oblique;
  line-height: 1.2;
}

h1, h2 {
  transform: skew(var(--skew));
}

p {
  margin: 0 0 1.2em;
}

ul, ol {
  margin: 0 0 1.2em;
  padding-left: 1.4em;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

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

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

svg {
  display: block;
}

address {
  font-style: normal;
}

button {
  font: inherit;
}

blockquote {
  margin: 0;
  padding: 0.2rem 0 0.2rem 1.25rem;
  border-left: 3px solid var(--color-gold);
  color: var(--color-muted);
}

hr {
  border: 0;
  height: 1px;
  background: rgba(138, 147, 181, 0.3);
  margin: 2.5rem 0;
}

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

::-webkit-scrollbar {
  width: 12px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: #1D2A4D;
  border: 3px solid var(--color-bg);
  border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}

body.has-nav-open {
  overflow: hidden;
}

/* ---------- 2. 通用容器与栅格 ---------- */
.container {
  width: min(100% - 3rem, var(--container-w));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-section);
  position: relative;
}

.section-head {
  max-width: 46rem;
  margin-bottom: 2.5rem;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  margin-bottom: 0.4em;
}

.section-title::after {
  content: "";
  display: inline-block;
  width: 0.42em;
  height: 0.16em;
  background: var(--color-accent);
  margin-left: 0.25em;
  vertical-align: 0.14em;
}

.section-lead {
  max-width: 44em;
  color: var(--color-muted);
  font-size: 1.02rem;
  line-height: 1.9;
  margin-bottom: 0;
}

.page-hero {
  min-height: 34vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-top: calc(var(--header-h) + 3.5rem);
  padding-bottom: 2.5rem;
  position: relative;
  border-bottom: 1px solid rgba(244, 246, 255, 0.08);
}

.page-title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  margin-bottom: 0.35rem;
}

.page-lead {
  max-width: 42ch;
  color: var(--color-muted);
  margin-bottom: 0;
}

.hero-bleed {
  margin-top: calc(-1 * var(--header-h));
}

.grid {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

@media (min-width: 1081px) {
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .grid-asym {
    grid-template-columns: 1.6fr 1fr;
  }
}

/* ---------- 3. 展览组件 ---------- */
.chapter-index {
  display: inline-flex;
  align-items: baseline;
  gap: 0.65rem;
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid rgba(245, 196, 107, 0.3);
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  color: var(--color-gold);
  text-transform: uppercase;
}

.chapter-num {
  color: var(--color-accent);
  font-weight: 700;
}

.exhibit-label {
  display: inline-block;
  background: var(--color-panel);
  border-left: 2px solid var(--color-gold);
  padding: 0.45rem 0.85rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  text-transform: uppercase;
  line-height: 1.6;
}

.exhibit-tag {
  display: inline-block;
  border: 1px solid rgba(138, 147, 181, 0.45);
  border-radius: 999px;
  padding: 0.22rem 0.85rem;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--color-muted);
  white-space: nowrap;
  line-height: 1.6;
}

.exhibit-tag.is-hot {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.exhibit-tag.is-live {
  color: var(--color-lime);
  border-color: var(--color-lime);
}

.exhibition-plate {
  display: inline-flex;
  flex-direction: column;
  gap: 0.12rem;
  max-width: 30rem;
  padding: 0.55rem 0.85rem;
  border-top: 1px solid rgba(245, 196, 107, 0.3);
  border-bottom: 1px solid rgba(245, 196, 107, 0.3);
  background: rgba(18, 26, 51, 0.9);
  font-family: var(--font-data);
  font-size: 0.74rem;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--color-muted);
}

.exhibition-plate strong {
  font-family: var(--font-heading);
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--color-text);
}

.tilt-ribbon {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  padding: 0.35rem 1.1rem;
  transform: skew(var(--skew));
  clip-path: polygon(4px 0, 100% 0, calc(100% - 4px) 100%, 0 100%);
  box-shadow: 0 6px 20px rgba(255, 107, 44, 0.28);
}

.data-card {
  position: relative;
  overflow: hidden;
  background: var(--color-panel);
  border: 1px solid rgba(244, 246, 255, 0.09);
  border-radius: 2px;
  padding: 1.4rem 1.5rem;
}

.data-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-lime));
  transform: scaleX(0.25);
  transform-origin: left;
  transition: transform 0.45s var(--ease-cubic);
}

.data-card:hover::before {
  transform: scaleX(1);
}

.card-kicker {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--color-muted);
  text-transform: uppercase;
}

.metric-value {
  display: block;
  margin: 0.4rem 0 0.2rem;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  font-size: 2rem;
  line-height: 1.15;
  color: var(--color-lime);
}

.card-caption {
  color: var(--color-muted);
  font-size: 0.84rem;
  line-height: 1.6;
  margin-bottom: 0;
}

.announce-strip {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.7rem 1.1rem;
  background: linear-gradient(90deg, rgba(255, 56, 96, 0.14), rgba(255, 107, 44, 0.08));
  border-left: 3px solid var(--color-alert);
  font-size: 0.88rem;
}

.announce-time {
  flex-shrink: 0;
  font-family: var(--font-data);
  font-size: 0.74rem;
  color: var(--color-alert);
  white-space: nowrap;
}

.announce-text {
  color: var(--color-text);
}

.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background-color: var(--color-panel);
  background-image:
    linear-gradient(to right, rgba(182, 255, 58, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(182, 255, 58, 0.06) 1px, transparent 1px);
  background-size: 32px 32px;
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0.7rem;
  border: 1px solid rgba(245, 196, 107, 0.45);
  pointer-events: none;
  transition: inset 0.35s ease;
}

.image-frame:hover::after {
  inset: 0.35rem;
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.image-frame.is-wide {
  aspect-ratio: 21 / 9;
}

.image-frame.is-portrait {
  aspect-ratio: 3 / 4;
}

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.68rem 1.4rem;
  border: 0;
  cursor: pointer;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.88rem;
  line-height: 1;
  text-decoration: none;
  color: var(--color-bg);
  background: var(--color-accent);
  transform: skew(var(--skew));
  transition: background 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn > span {
  display: inline-block;
  transform: skew(calc(-1 * var(--skew)));
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn-accent:hover {
  background: #ff8350;
  color: var(--color-bg);
  box-shadow: 0 8px 28px rgba(255, 107, 44, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid rgba(244, 246, 255, 0.32);
}

.btn-outline > span {
  color: var(--color-text);
}

.btn-outline:hover {
  background: rgba(255, 107, 44, 0.08);
  border-color: var(--color-accent);
  color: var(--color-text);
  box-shadow: none;
}

/* ---------- 5. 面包屑与表单 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  margin: 0 0 2rem;
  padding: 0;
  list-style: none;
  font-family: var(--font-data);
  font-size: 0.78rem;
  color: var(--color-muted);
}

.breadcrumbs li + li::before {
  content: "/";
  margin: 0 0.55rem;
  color: var(--color-muted);
  opacity: 0.5;
}

.breadcrumbs a {
  color: var(--color-muted);
  text-decoration: none;
}

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

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

.form-field {
  margin-bottom: 1.4rem;
}

.form-label {
  display: block;
  margin-bottom: 0.45rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.86rem;
  color: var(--color-text);
}

.form-control {
  width: 100%;
  padding: 0.7rem 0.9rem;
  background: var(--color-panel);
  border: 1px solid rgba(138, 147, 181, 0.4);
  border-radius: 2px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255, 107, 44, 0.2);
}

/* ---------- 6. 顶部跳过与滚动进度 ---------- */
.site-skip {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 500;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
  padding: 0.5rem 1rem;
  border-radius: 2px;
  text-decoration: none;
  transform: translateY(-220%);
  transition: transform 0.2s ease;
}

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

.page-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 400;
  height: 3px;
  pointer-events: none;
}

.page-progress span {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-lime));
}

/* ---------- 7. 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: linear-gradient(to bottom, rgba(10, 17, 40, 0.72), rgba(10, 17, 40, 0));
  border-bottom: 1px solid transparent;
  transition: background 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(245, 196, 107, 0.6), transparent);
}

.site-header.is-scrolled {
  background: rgba(10, 17, 40, 0.96);
  border-bottom-color: rgba(245, 196, 107, 0.25);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  height: var(--header-h);
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 0;
  color: var(--color-text);
  text-decoration: none;
  position: relative;
  z-index: 310;
}

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

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex-shrink: 0;
}

.brand-mark svg {
  width: 100%;
  height: 100%;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.22rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.brand-tagline {
  font-family: var(--font-data);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--color-muted);
  white-space: nowrap;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  flex-shrink: 0;
}

.live-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0.28rem 0.8rem;
  border: 1px solid rgba(182, 255, 58, 0.28);
  border-radius: 999px;
  background: rgba(182, 255, 58, 0.07);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  white-space: nowrap;
}

.live-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-lime);
  animation: live-pulse 2s ease-in-out infinite;
}

.live-text {
  color: var(--color-text);
}

.live-count {
  color: var(--color-lime);
}

@keyframes live-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(182, 255, 58, 0.6);
  }
  50% {
    box-shadow: 0 0 0 5px rgba(182, 255, 58, 0);
  }
}

.site-nav {
  z-index: 250;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  display: block;
  position: relative;
  padding: 0.5rem 0.8rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0.8rem;
  right: 0.8rem;
  bottom: 0.15rem;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease-cubic);
}

.nav-link:hover {
  color: var(--color-accent);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--color-accent);
}

.header-cta {
  position: relative;
  z-index: 260;
  padding: 0.6rem 1.1rem;
}

.nav-mobile-cta {
  display: none;
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: 310;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 8px;
  border: 1px solid rgba(244, 246, 255, 0.25);
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.3s var(--ease-cubic), opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: 0;
  background: linear-gradient(180deg, var(--color-deep), var(--color-bg));
  border-top: 1px solid rgba(245, 196, 107, 0.28);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-gold) 18%, var(--color-accent) 50%, var(--color-lime) 82%, transparent);
  opacity: 0.6;
}

.site-footer::after {
  content: "";
  position: absolute;
  right: -6rem;
  bottom: -6rem;
  width: 18rem;
  height: 18rem;
  border: 1px solid rgba(182, 255, 58, 0.12);
  transform: rotate(45deg);
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.3fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  padding-block: clamp(3.5rem, 7vw, 5.5rem) clamp(2.5rem, 5vw, 4rem);
}

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

.footer-brand .brand-lockup {
  margin-bottom: 1.4rem;
}

.footer-brand .brand-name {
  font-size: 1.35rem;
}

.footer-about {
  max-width: 34ch;
  margin: 0 0 1.4rem;
  color: var(--color-text);
  font-size: 0.95rem;
}

.footer-trust {
  margin: 1.6rem 0 0;
  padding: 0.85rem 1rem;
  background: rgba(182, 255, 58, 0.07);
  border-left: 2px solid var(--color-lime);
  color: var(--color-muted);
  font-size: 0.82rem;
  line-height: 1.7;
}

.trust-kicker {
  display: inline-block;
  margin-right: 0.6em;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--color-lime);
  text-transform: uppercase;
}

.footer-heading {
  margin: 0 0 1.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(245, 196, 107, 0.25);
  font-family: var(--font-heading);
  font-weight: 900;
  font-style: oblique;
  font-size: 0.95rem;
  letter-spacing: 0.18em;
  color: var(--color-gold);
  text-transform: uppercase;
  transform: none;
}

.footer-list {
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-list a {
  color: var(--color-muted);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-list a:hover {
  color: var(--color-lime);
  padding-left: 0.4rem;
}

.footer-address {
  display: grid;
  gap: 0.5rem;
}

.contact-line {
  display: flex;
  gap: 0.55rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px dashed rgba(138, 147, 181, 0.18);
  font-size: 0.86rem;
  color: var(--color-muted);
  overflow-wrap: anywhere;
}

.contact-label {
  flex-shrink: 0;
  padding-top: 0.15rem;
  font-family: var(--font-data);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  text-transform: uppercase;
}

.contact-note {
  margin: 0.6rem 0 0;
  color: var(--color-muted);
  font-size: 0.8rem;
  line-height: 1.7;
}

.footer-bottom {
  position: relative;
  background: rgba(0, 0, 0, 0.25);
  border-top: 1px solid rgba(138, 147, 181, 0.16);
  padding: 1.1rem 0;
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
}

.footer-copyright,
.footer-icp {
  margin: 0;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--color-muted);
}

/* ---------- 9. 响应式：中屏 1180px ---------- */
@media (max-width: 1180px) {
  .live-status {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1.2fr 1fr 1fr;
  }

  .footer-contact {
    grid-column: 1 / -1;
  }
}

/* ---------- 10. 响应式：平板与移动导航 1080px ---------- */
@media (max-width: 1080px) {
  :root {
    --header-h: 68px;
  }

  .container {
    width: min(100% - 2rem, var(--container-w));
  }

  .header-cta {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: min(84vw, 340px);
    height: 100dvh;
    z-index: 250;
    padding: calc(var(--header-h) + 2.2rem) 1.6rem 2rem;
    background: rgba(10, 17, 40, 0.88);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-left: 1px solid rgba(245, 196, 107, 0.28);
    transform: translateX(100%);
    visibility: hidden;
    overflow-y: auto;
    transition: transform 0.4s var(--ease-cubic), visibility 0s linear 0.4s;
  }

  .site-nav::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    background: rgba(7, 13, 31, 0.5);
    opacity: 0;
    transition: opacity 0.3s ease;
  }

  .site-nav[data-open="true"] {
    transform: translateX(0);
    visibility: visible;
    transition: transform 0.4s var(--ease-cubic), visibility 0s linear 0s;
  }

  .site-nav[data-open="true"]::before {
    opacity: 1;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
  }

  .nav-list li {
    width: 100%;
  }

  .nav-link {
    width: 100%;
    padding: 0.8rem 0.5rem;
    font-size: 1.05rem;
    border-bottom: 1px dashed rgba(138, 147, 181, 0.25);
  }

  .nav-link::after {
    left: 0.5rem;
    right: 60%;
    bottom: 0.3rem;
  }

  .nav-mobile-cta {
    display: inline-flex;
    width: 100%;
    margin-top: 1.6rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.4rem;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-contact {
    grid-column: 1 / -1;
  }
}

/* ---------- 11. 响应式：小屏 640px ---------- */
@media (max-width: 640px) {
  :root {
    --header-h: 60px;
  }

  .container {
    width: min(100% - 1.5rem, var(--container-w));
  }

  .header-inner {
    gap: 0.75rem;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .brand-name {
    font-size: 1.1rem;
  }

  .brand-tagline {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-brand,
  .footer-contact {
    grid-column: auto;
  }

  .footer-bottom-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- 12. 减弱动态偏好 ---------- */
@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;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }
}