/* ============================================
   BOB半岛(CHINA)官方网站 — Site Kit
   /assets/site.css
   半岛赛程中心 · BOB体育比赛视频集锦 · 简体版直播首页导航
   ============================================ */

/* ---------- 设计变量 ---------- */
:root {
  --color-night: #071512;
  --color-ink: #0B3D2E;
  --color-silver: #C7D0CC;
  --color-orange: #FF6B2B;
  --color-purple: #B44AFF;
  --color-moon: #F2F5F3;
  --color-lead: #343A37;
  --color-lime: #C6F43A;

  --font-display: "Rajdhani", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Consolas", monospace;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 160ms;
  --duration-base: 300ms;
  --duration-slow: 400ms;

  --header-height: 4.5rem;
  --container-width: 1440px;
  --container-pad: clamp(1rem, 3vw, 2.5rem);
  --radius-sm: 4px;
  --radius-md: 8px;

  --shadow-panel: 0 12px 32px rgba(0, 0, 0, 0.35), 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-raise: 0 4px 16px rgba(0, 0, 0, 0.25);
}

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

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

body {
  min-height: 100vh;
  background-color: var(--color-night);
  color: var(--color-moon);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

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

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-moon);
}

strong {
  font-weight: 600;
}

::selection {
  background: var(--color-orange);
  color: var(--color-night);
}

/* ---------- 中文排版 ---------- */
:lang(zh-CN),
[lang="zh-CN"] {
  letter-spacing: 0.02em;
}

p {
  text-wrap: pretty;
}

.caption,
.site-footer__contact-note,
.site-footer__about,
.breadcrumbs {
  font-size: 0.875rem;
  color: var(--color-silver);
}

/* ---------- 焦点可见性 ---------- */
:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

.section {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

.grid {
  display: grid;
  gap: clamp(1rem, 2vw, 1.75rem);
}

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

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

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 屏幕阅读器 ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 1rem;
  z-index: 300;
  background: var(--color-orange);
  color: var(--color-night);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transform: translateY(-110%);
  transition: transform var(--duration-base) var(--ease-out);
}

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

/* ---------- 阅读进度条 ---------- */
.site-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 250;
  height: 3px;
  background: transparent;
  pointer-events: none;
}

.site-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--color-orange) 0%, var(--color-purple) 50%, var(--color-lime) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.1s linear;
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

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

.btn:active {
  transform: translateY(0);
}

.btn--hot {
  background: var(--color-orange);
  color: var(--color-night);
}

.btn--hot:hover {
  background: #ff7d45;
  box-shadow: 0 6px 20px rgba(255, 107, 43, 0.3);
}

.btn--neon {
  background: var(--color-purple);
  color: var(--color-night);
}

.btn--neon:hover {
  background: #c35dff;
  box-shadow: 0 6px 20px rgba(180, 74, 255, 0.3);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-lead);
  color: var(--color-silver);
}

.btn--ghost:hover {
  border-color: var(--color-silver);
  color: var(--color-moon);
  background: rgba(199, 208, 204, 0.05);
}

.btn--small {
  padding: 0.375rem 0.875rem;
  font-size: 0.8125rem;
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--color-lead);
  border-radius: var(--radius-sm);
  color: var(--color-silver);
  background: rgba(7, 21, 18, 0.6);
}

.tag--hot {
  color: var(--color-orange);
  border-color: rgba(255, 107, 43, 0.4);
}

.tag--neon {
  color: var(--color-purple);
  border-color: rgba(180, 74, 255, 0.4);
}

.tag--lime {
  color: var(--color-lime);
  border-color: rgba(198, 244, 58, 0.35);
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-mono);
  padding-block: 0.75rem;
}

.breadcrumbs a {
  color: var(--color-silver);
  transition: color var(--duration-fast) var(--ease-out);
}

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

.breadcrumbs__sep {
  color: var(--color-lead);
}

.breadcrumbs__current {
  color: var(--color-orange);
  font-weight: 600;
}

/* ---------- 页面标题 ---------- */
.page-title {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
  padding-block: clamp(1.5rem, 4vw, 3rem) 1rem;
}

.page-title__index {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-orange);
  letter-spacing: 0.1em;
}

.page-title h1 {
  font-size: clamp(2.2rem, 5vw, 4.2rem);
  font-weight: 800;
  letter-spacing: 0.02em;
}

.page-title__desc {
  width: 100%;
  color: var(--color-silver);
  max-width: 60ch;
  font-size: 1rem;
  margin-top: 0.5rem;
}

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(135deg, rgba(7, 21, 18, 0.95) 0%, rgba(11, 61, 46, 0.92) 100%);
  border-bottom: 1px solid rgba(52, 58, 55, 0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  min-height: var(--header-height);
}

.site-header__start {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-shrink: 0;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.site-header__mark {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  transition: transform var(--duration-base) var(--ease-out);
}

.site-header__brand:hover .site-header__mark {
  transform: rotate(-6deg) scale(1.04);
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.site-header__brand-name {
  font-family: var(--font-display);
  font-size: 1.1875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-moon);
  line-height: 1.2;
  white-space: nowrap;
}

.site-header__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--color-purple);
  border: 1px solid rgba(180, 74, 255, 0.35);
  background: rgba(180, 74, 255, 0.07);
  padding: 0.125rem 0.4375rem;
  border-radius: 2px;
  white-space: nowrap;
  align-self: flex-start;
}

/* 快捷入口 */
.site-header__quick {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-header__quick-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 0.3125rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  white-space: nowrap;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.site-header__quick-link--score {
  color: var(--color-orange);
  border-color: rgba(255, 107, 43, 0.45);
  background: rgba(255, 107, 43, 0.08);
}

.site-header__quick-link--score:hover {
  background: var(--color-orange);
  color: var(--color-night);
}

.site-header__quick-link--video {
  color: var(--color-purple);
  border-color: rgba(180, 74, 255, 0.45);
  background: rgba(180, 74, 255, 0.08);
}

.site-header__quick-link--video:hover {
  background: var(--color-purple);
  color: var(--color-night);
}

.site-header__quick-index {
  font-size: 0.75rem;
  font-weight: 700;
  opacity: 0.85;
}

/* 右侧导航区 */
.site-header__end {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-shrink: 0;
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: 0.125rem;
}

.site-header__nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-silver);
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  position: relative;
  white-space: nowrap;
  transition:
    color var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out);
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0.875rem;
  right: 0.875rem;
  bottom: 0.125rem;
  height: 2px;
  background: linear-gradient(90deg, var(--color-orange), var(--color-purple));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--duration-base) var(--ease-out);
}

.site-header__nav-link:hover {
  color: var(--color-moon);
  background: rgba(199, 208, 204, 0.05);
}

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

.site-header__nav-link[aria-current="page"] {
  color: var(--color-orange);
  font-weight: 600;
}

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

.site-header__nav-index {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 400;
  color: var(--color-lead);
  letter-spacing: 0.05em;
  transition: color var(--duration-fast) var(--ease-out);
}

.site-header__nav-link:hover .site-header__nav-index,
.site-header__nav-link[aria-current="page"] .site-header__nav-index {
  color: var(--color-purple);
}

/* 汉堡按钮 */
.site-header__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-lead);
  background: rgba(11, 61, 46, 0.4);
  transition:
    background-color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
}

.site-header__toggle:hover {
  background: rgba(11, 61, 46, 0.8);
  border-color: var(--color-silver);
}

.site-header__toggle-box {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 20px;
}

.site-header__toggle-line {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-silver);
  border-radius: 2px;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    transform var(--duration-base) var(--ease-out);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--color-orange);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--color-orange);
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  background:
    linear-gradient(115deg, rgba(199, 208, 204, 0.03) 25%, transparent 25%),
    linear-gradient(115deg, transparent 75%, rgba(199, 208, 204, 0.02) 75%),
    var(--color-ink);
  border-top: 1px solid var(--color-lead);
  margin-top: clamp(3rem, 6vw, 5rem);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-orange) 0%, var(--color-orange) 25%, var(--color-silver) 25%, var(--color-silver) 30%, transparent 30%);
  pointer-events: none;
}

.site-footer__inner {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(260px, 1.4fr) repeat(2, minmax(160px, 0.8fr)) minmax(240px, 1.2fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-block: clamp(2.5rem, 5vw, 4rem) 2rem;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.875rem;
}

.site-footer__mark {
  width: 52px;
  height: 52px;
}

.site-footer__brand-copy {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.site-footer__brand-name {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--color-moon);
}

.site-footer__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--color-purple);
  border: 1px solid rgba(180, 74, 255, 0.35);
  background: rgba(180, 74, 255, 0.06);
  padding: 0.1875rem 0.5rem;
  border-radius: 2px;
  align-self: flex-start;
}

.site-footer__about {
  font-size: 0.8125rem;
  color: var(--color-silver);
  line-height: 1.6;
  max-width: 28ch;
}

.site-footer__col {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.site-footer__col-title {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-silver);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed rgba(199, 208, 204, 0.2);
}

.site-footer__link {
  font-size: 0.875rem;
  color: var(--color-silver);
  padding: 0.1875rem 0;
  transition:
    color var(--duration-fast) var(--ease-out),
    padding-left var(--duration-fast) var(--ease-out);
}

.site-footer__link:hover {
  color: var(--color-orange);
  padding-left: 0.375rem;
}

.site-footer__contact {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

.site-footer__contact-item {
  display: flex;
  flex-direction: column;
  font-size: 0.875rem;
  color: var(--color-moon);
  line-height: 1.4;
}

.site-footer__contact-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: 0.125rem;
}

.site-footer__contact-note {
  font-size: 0.75rem;
  color: var(--color-lead);
  line-height: 1.5;
  margin-top: 0.5rem;
}

.site-footer__bottom {
  border-top: 1px solid rgba(52, 58, 55, 0.7);
  padding-block: 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.site-footer__trust {
  font-size: 0.75rem;
  color: var(--color-lead);
  line-height: 1.7;
  max-width: 80ch;
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-lead);
}

.site-footer__copyright {
  color: var(--color-silver);
}

.site-footer__icp {
  color: var(--color-lead);
  letter-spacing: 0.06em;
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 120;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(11, 61, 46, 0.9);
  color: var(--color-silver);
  border: 1px solid var(--color-lead);
  border-radius: 50%;
  box-shadow: var(--shadow-raise);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity var(--duration-base) var(--ease-out),
    transform var(--duration-base) var(--ease-out),
    visibility var(--duration-base) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
}

.back-to-top svg {
  width: 22px;
  height: 22px;
}

.back-to-top:hover {
  background: var(--color-orange);
  color: var(--color-night);
  border-color: var(--color-orange);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 媒体图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(180, 74, 255, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 80%, rgba(255, 107, 43, 0.06) 0%, transparent 50%),
    var(--color-ink);
  border: 1px solid var(--color-lead);
  border-radius: var(--radius-md);
  aspect-ratio: 16 / 9;
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(199, 208, 204, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(199, 208, 204, 0.06) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
  z-index: 1;
}

.media-frame::after {
  content: "";
  position: absolute;
  top: -60%;
  left: -15%;
  width: 40%;
  height: 220%;
  background: linear-gradient(90deg, transparent, rgba(255, 107, 43, 0.08), transparent);
  transform: rotate(18deg);
  pointer-events: none;
  z-index: 2;
}

.media-frame--16x9 {
  aspect-ratio: 16 / 9;
}

.media-frame--4x3 {
  aspect-ratio: 4 / 3;
}

.media-frame--1x1 {
  aspect-ratio: 1 / 1;
}

.media-frame--21x9 {
  aspect-ratio: 21 / 9;
}

.media-frame--tall {
  aspect-ratio: 3 / 4;
}

.media-frame__index {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 3;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--color-silver);
  background: rgba(7, 21, 18, 0.78);
  border: 1px solid rgba(199, 208, 204, 0.15);
  padding: 0.1875rem 0.5rem;
  border-radius: 2px;
}

.media-frame__placeholder {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: var(--color-silver);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-align: center;
  padding: 1rem;
}

.media-frame__placeholder svg {
  width: 40px;
  height: 40px;
  opacity: 0.55;
}

/* ---------- 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

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

/* ---------- 章节锚点高亮 ---------- */
[data-section-spy].is-active {
  color: var(--color-orange);
  font-weight: 600;
  border-left: 2px solid var(--color-orange);
  padding-left: 0.625rem;
}

/* ---------- 背景图案工具 ---------- */
.pattern-grid {
  position: relative;
  background-image:
    linear-gradient(to right, rgba(199, 208, 204, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(199, 208, 204, 0.04) 1px, transparent 1px);
  background-size: 32px 32px;
}

.clip-angle {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2rem), 0 100%);
}

.clip-angle--flip {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 2rem));
}

/* ---------- 响应式 ---------- */
@media (max-width: 1280px) {
  .site-header__start {
    gap: 1.25rem;
  }

  .site-header__quick {
    display: none;
  }
}

@media (max-width: 960px) {
  :root {
    --header-height: 4rem;
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 99;
    flex-direction: column;
    align-items: stretch;
    gap: 0.125rem;
    background: rgba(7, 21, 18, 0.97);
    border-top: 1px solid rgba(255, 107, 43, 0.4);
    border-bottom: 1px solid var(--color-lead);
    box-shadow: 0 24px 40px rgba(0, 0, 0, 0.35);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition:
      max-height var(--duration-slow) var(--ease-out),
      opacity var(--duration-base) var(--ease-out),
      transform var(--duration-slow) var(--ease-out);
    padding-inline: var(--container-pad);
  }

  .site-header__nav[data-open] {
    max-height: 28rem;
    opacity: 1;
    transform: translateY(0);
    padding-block: 0.75rem 1.25rem;
  }

  .site-header__nav-link {
    width: 100%;
    padding: 0.75rem 0.875rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
  }

  .site-header__nav-link::after {
    left: 0.875rem;
    right: auto;
    width: 2.5rem;
  }

  .site-header__brand-name {
    font-size: 1rem;
  }

  .site-header__badge {
    display: none;
  }

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

@media (max-width: 768px) {
  .site-header__quick {
    display: none;
  }

  .site-header__mark {
    width: 38px;
    height: 38px;
  }

  .site-header__brand-name {
    font-size: 0.9375rem;
    white-space: normal;
  }

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

  .back-to-top {
    right: 1rem;
    bottom: 1rem;
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 480px) {
  .site-header__inner {
    padding-inline: 1rem;
    gap: 1rem;
  }

  .site-header__nav-link {
    font-size: 0.9375rem;
  }

  .site-footer__legal {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
}

/* ---------- 动效偏好 ---------- */
@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;
  }

  .site-header__nav,
  .back-to-top,
  [data-reveal] {
    transition: none;
  }

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