/* ==========================================================================
   得乐88投注 · 共享 Site Kit 样式
   路径：/assets/site.css
   负责：reset / 变量 / 中文排版 / 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;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 6rem;
}

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

ul,
ol {
  padding: 0;
}

ul[class],
ol[class] {
  list-style: none;
}

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

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

a {
  color: var(--gold);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 2. Tokens ---------- */
:root {
  --ink-900: #0b1230;
  --ink-800: #111a3e;
  --ink-700: #1b2a5b;

  --gold: #ffb020;
  --cyan: #22d3ee;
  --coral: #ff5a5f;
  --mint: #e8f0ff;
  --mist: #a9b8d8;
  --ok: #34d399;

  --glass: rgba(232, 240, 255, 0.08);
  --line: rgba(232, 240, 255, 0.14);
  --line-strong: rgba(232, 240, 255, 0.28);

  --shell-max: 1180px;
  --shell-edge: 1.25rem;

  --font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "PingFang SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Courier New", monospace;

  --radius-sm: 0.6rem;
  --radius-md: 1.1rem;
  --radius-lg: 1.6rem;
  --radius-pill: 999px;

  --ease: cubic-bezier(0.22, 0.7, 0.3, 1);
}

@media (max-width: 600px) {
  :root {
    --shell-edge: 1rem;
  }
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background: var(--ink-900);
  color: var(--mint);
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.2vw + 0.96rem, 1.08rem);
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(90rem 50rem at 78% -10%, rgba(34, 211, 238, 0.1), transparent 62%),
    radial-gradient(64rem 36rem at 4% 2%, rgba(27, 42, 91, 0.85), transparent 66%),
    radial-gradient(50rem 34rem at 96% 88%, rgba(255, 176, 32, 0.07), transparent 68%),
    linear-gradient(180deg, #0b1230 0%, #0b1230 52%, #0a1029 100%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    linear-gradient(rgba(232, 240, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 240, 255, 0.035) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: radial-gradient(58% 46% at 50% 0%, #000 0%, transparent 88%);
  mask-image: radial-gradient(58% 46% at 50% 0%, #000 0%, transparent 88%);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: 0.03em;
  color: var(--mint);
}

h1 {
  font-size: clamp(2.4rem, 5vw, 4.8rem);
  letter-spacing: 0.02em;
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
}

h3 {
  font-size: clamp(1.24rem, 1.6vw, 1.5rem);
  letter-spacing: 0.015em;
}

h4 {
  font-size: 1.06rem;
  letter-spacing: 0.04em;
}

p {
  margin-bottom: 1.1em;
}

p:last-child {
  margin-bottom: 0;
}

strong,
b {
  color: var(--mint);
  font-weight: 700;
}

small {
  font-size: 0.82rem;
  color: var(--mist);
}

hr {
  border: 0;
  height: 1px;
  background: var(--line);
  margin-block: 2rem;
}

::selection {
  background: rgba(255, 176, 32, 0.28);
  color: #fff;
}

/* ---------- 4. 通用容器与章节 ---------- */
.shell {
  width: min(var(--shell-max), 100% - var(--shell-edge) * 2);
  margin-inline: auto;
}

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

.section--tight {
  padding-block: clamp(1.8rem, 3.6vw, 3rem);
}

.section-head {
  display: grid;
  gap: 0.85rem;
  max-width: 42rem;
  margin-bottom: clamp(1.6rem, 3vw, 2.6rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 1.7rem;
  height: 1px;
  background: var(--gold);
  box-shadow: 0 0 8px rgba(255, 176, 32, 0.7);
}

.display {
  display: block;
  color: var(--mint);
}

.display em {
  font-style: normal;
  color: var(--gold);
}

.lede {
  font-size: clamp(1rem, 1.25vw, 1.16rem);
  line-height: 1.8;
  color: var(--mist);
  max-width: 34em;
}

.prose {
  max-width: 40rem;
}

.prose p,
.prose li {
  max-width: 34em;
  color: var(--mist);
}

.prose h2,
.prose h3 {
  margin-top: 1.8em;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
  margin-block: clamp(1.8rem, 4vw, 3rem);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.3rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--mint);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 0.16s var(--ease),
    box-shadow 0.2s var(--ease),
    background-color 0.2s var(--ease),
    border-color 0.2s var(--ease),
    color 0.2s var(--ease);
}

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

.btn--gold {
  background: linear-gradient(135deg, #ffc94d, var(--gold) 62%, #f0950a);
  color: #0b1230;
  box-shadow: 0 12px 26px -16px rgba(255, 176, 32, 0.95), inset 0 0 0 1px rgba(255, 255, 255, 0.22);
}

.btn--gold:hover,
.btn--gold:focus-visible {
  box-shadow: 0 16px 32px -14px rgba(255, 176, 32, 1), inset 0 0 0 1px rgba(255, 255, 255, 0.4);
}

.btn--ghost {
  border-color: var(--line-strong);
  background: rgba(232, 240, 255, 0.04);
  color: var(--mint);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--cyan);
  background: rgba(34, 211, 238, 0.09);
  color: #ffffff;
}

.btn--cyan {
  border-color: rgba(34, 211, 238, 0.55);
  background: rgba(34, 211, 238, 0.08);
  color: var(--cyan);
}

.btn--cyan:hover,
.btn--cyan:focus-visible {
  background: rgba(34, 211, 238, 0.16);
  color: #ffffff;
  border-color: var(--cyan);
}

.btn--sm {
  padding: 0.48rem 0.95rem;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
}

/* ---------- 6. 标签与状态 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.16rem 0.6rem;
  border: 1px solid currentColor;
  border-radius: var(--radius-pill);
  background: rgba(232, 240, 255, 0.04);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  line-height: 1.6;
  white-space: nowrap;
}

.tag--gold {
  color: var(--gold);
  background: rgba(255, 176, 32, 0.1);
}

.tag--cyan {
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.1);
}

.tag--coral {
  color: var(--coral);
  background: rgba(255, 90, 95, 0.1);
}

.tag--ok {
  color: var(--ok);
  background: rgba(52, 211, 153, 0.1);
}

.tag--muted {
  color: var(--mist);
  border-color: var(--line-strong);
  background: transparent;
}

/* ---------- 7. 卡片 ---------- */
.card {
  padding: clamp(1.2rem, 2.2vw, 1.9rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ink-800);
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.card:hover {
  border-color: rgba(34, 211, 238, 0.42);
}

.card--glass {
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border-color: var(--line-strong);
}

/* ---------- 8. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.crumbs a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.crumbs a:hover,
.crumbs a:focus-visible {
  color: var(--cyan);
}

.crumbs-sep {
  color: rgba(169, 184, 216, 0.45);
}

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

/* ---------- 9. 索引目录 ---------- */
.index-list {
  display: grid;
  gap: 0.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.index-item {
  display: grid;
  grid-template-columns: 3.2rem minmax(0, 1fr) auto;
  gap: 0.9rem;
  align-items: baseline;
  padding: 0.72rem 0.2rem;
  border-bottom: 1px dashed rgba(232, 240, 255, 0.14);
  transition: border-color 0.2s var(--ease);
}

.index-item:hover {
  border-bottom-color: rgba(34, 211, 238, 0.5);
}

.index-num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.index-item a {
  color: var(--mint);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.index-item a:hover,
.index-item a:focus-visible {
  color: var(--cyan);
}

.index-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--mist);
}

/* ---------- 10. 图像容器（页面阶段放置图片占位） ---------- */
.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background:
    radial-gradient(120% 90% at 14% 8%, rgba(34, 211, 238, 0.24), transparent 58%),
    radial-gradient(110% 90% at 92% 96%, rgba(255, 176, 32, 0.18), transparent 62%),
    linear-gradient(158deg, #142049 0%, #111a3e 46%, #0b1230 100%);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(232, 240, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 240, 255, 0.055) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: linear-gradient(160deg, #000 10%, transparent 82%);
  mask-image: linear-gradient(160deg, #000 10%, transparent 82%);
}

.media-frame img {
  position: relative;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.media-frame--tall {
  aspect-ratio: 4 / 5;
}

.media-frame-caption {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--mist);
}

/* ---------- 11. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0.65rem;
  left: 50%;
  z-index: 500;
  transform: translate(-50%, -170%);
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-pill);
  background: var(--gold);
  color: #0b1230;
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  box-shadow: 0 16px 34px -16px rgba(0, 0, 0, 0.95);
  transition: transform 0.22s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
}

/* ---------- 12. 悬浮胶囊头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  padding-block: clamp(0.7rem, 1.4vw, 1.1rem);
  transition: padding-block 0.28s var(--ease);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 18, 48, 0.9), rgba(11, 18, 48, 0.24));
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}

.site-header.is-compact::before {
  opacity: 1;
}

.header-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: min(var(--shell-max), 100% - var(--shell-edge) * 2);
  margin-inline: auto;
  padding: 0.5rem 0.55rem 0.5rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: linear-gradient(120deg, rgba(23, 34, 74, 0.86), rgba(13, 21, 52, 0.78));
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  backdrop-filter: blur(18px) saturate(150%);
  box-shadow:
    0 22px 46px -32px rgba(0, 0, 0, 0.95),
    inset 0 1px 0 rgba(232, 240, 255, 0.07);
  transition:
    padding 0.28s var(--ease),
    box-shadow 0.28s var(--ease),
    background-color 0.28s var(--ease);
}

.site-header.is-compact .header-shell {
  padding-block: 0.32rem;
  box-shadow:
    0 14px 30px -26px rgba(0, 0, 0, 0.95),
    inset 0 1px 0 rgba(232, 240, 255, 0.06);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 2.15rem;
  height: 2.15rem;
  border-radius: 0.72rem;
  background: linear-gradient(150deg, #ffd067, var(--gold) 55%, #f08a00);
  color: #0b1230;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.35),
    0 8px 20px -10px rgba(255, 176, 32, 0.9);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.12;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--mint);
  white-space: nowrap;
}

.brand-tag {
  overflow: hidden;
  max-height: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.04em;
  color: var(--mist);
  white-space: nowrap;
  transition: opacity 0.22s var(--ease), max-height 0.22s var(--ease);
}

.site-header.is-compact .brand-tag {
  opacity: 0;
  max-height: 0;
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  min-width: 0;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.12rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.46rem 0.72rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  color: var(--mist);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
  white-space: nowrap;
  transition:
    color 0.2s var(--ease),
    border-color 0.2s var(--ease),
    background-color 0.2s var(--ease);
}

.nav-link::before {
  content: "";
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(255, 176, 32, 0.18);
  opacity: 0;
  transform: scale(0.3);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--mint);
  border-color: rgba(34, 211, 238, 0.4);
  background: rgba(34, 211, 238, 0.07);
}

.nav-link[aria-current="page"] {
  color: var(--mint);
  border-color: rgba(255, 176, 32, 0.5);
  background: rgba(255, 176, 32, 0.1);
}

.nav-link[aria-current="page"]::before {
  opacity: 1;
  transform: scale(1);
}

.nav-cta {
  margin-left: 0.45rem;
  flex: 0 0 auto;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: rgba(232, 240, 255, 0.06);
  color: var(--mint);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.nav-toggle:hover {
  border-color: var(--cyan);
  background: rgba(34, 211, 238, 0.1);
}

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 1rem;
}

.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.24s var(--ease), opacity 0.2s var(--ease);
}

.site-header[data-open="true"] .nav-toggle-bars span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle-bars span:nth-child(2) {
  opacity: 0;
}

.site-header[data-open="true"] .nav-toggle-bars span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.nav-toggle-label {
  line-height: 1;
}

/* 滚动进度条 */
.scroll-meter {
  position: absolute;
  left: 50%;
  bottom: 0.15rem;
  transform: translateX(-50%);
  width: min(var(--shell-max), 100% - var(--shell-edge) * 2);
  height: 2px;
  overflow: hidden;
  border-radius: 2px;
  background: rgba(232, 240, 255, 0.1);
  pointer-events: none;
}

.scroll-meter-fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--gold));
  box-shadow: 0 0 12px rgba(255, 176, 32, 0.65);
  transition: width 0.12s linear;
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 7vw, 6rem);
  border-top: 1px solid var(--line);
  background:
    radial-gradient(60rem 26rem at 10% 0%, rgba(27, 42, 91, 0.6), transparent 66%),
    radial-gradient(46rem 22rem at 96% 8%, rgba(34, 211, 238, 0.08), transparent 68%),
    linear-gradient(180deg, #0c1333 0%, #0a1029 100%);
  color: var(--mist);
}

.footer-shell {
  width: min(var(--shell-max), 100% - var(--shell-edge) * 2);
  margin-inline: auto;
  padding-block: clamp(2.4rem, 5vw, 4rem) 1.6rem;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.55fr);
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
  padding-bottom: clamp(2rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
}

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

.brand--footer .brand-name {
  font-size: 1.15rem;
}

.footer-summary {
  max-width: 32em;
  margin: 1rem 0 1.3rem;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--mist);
}

.footer-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding-bottom: 0.15rem;
  border-bottom: 1px solid rgba(255, 176, 32, 0.42);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.footer-cta::after {
  content: "→";
  transition: transform 0.2s var(--ease);
}

.footer-cta:hover,
.footer-cta:focus-visible {
  color: #ffd067;
  border-color: var(--gold);
}

.footer-cta:hover::after {
  transform: translateX(3px);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2.4vw, 2rem);
}

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

.footer-col-title {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--mint);
}

.footer-col-index {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.94rem;
}

.footer-link {
  display: inline-block;
  padding-bottom: 2px;
  color: var(--mist);
  text-decoration: none;
  background-image: linear-gradient(var(--gold), var(--gold));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0 1px;
  transition: color 0.2s var(--ease), background-size 0.25s var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--mint);
  background-size: 100% 1px;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.7rem;
  padding-block: 1.35rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.79rem;
  letter-spacing: 0.04em;
}

.footer-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--mist);
}

.footer-meta-item strong {
  font-weight: 600;
  color: var(--mint);
}

.footer-dot {
  width: 0.32rem;
  height: 0.32rem;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.16);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.6rem 1.5rem;
  padding-top: 1.35rem;
  font-size: 0.79rem;
  color: rgba(169, 184, 216, 0.85);
}

.footer-legal p {
  margin: 0;
}

.footer-note {
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1080px) {
  .brand-tag {
    display: none;
  }

  .nav-link {
    padding: 0.44rem 0.56rem;
    font-size: 0.88rem;
  }

  .nav-cta {
    margin-left: 0.25rem;
  }
}

@media (max-width: 960px) {
  .site-header {
    padding-block: 0.55rem;
  }

  .header-shell {
    position: relative;
    padding: 0.45rem 0.55rem 0.45rem 0.85rem;
  }

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

  .site-nav {
    position: absolute;
    top: calc(100% + 0.6rem);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0.4rem;
    padding: 0.7rem;
    border: 1px solid var(--line-strong);
    border-radius: 1.4rem;
    background: linear-gradient(160deg, rgba(17, 26, 62, 0.98), rgba(11, 18, 48, 0.98));
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    box-shadow: 0 34px 70px -34px rgba(0, 0, 0, 1);
  }

  .site-header[data-open="true"] .site-nav {
    display: flex;
    animation: nav-shell-in 0.22s var(--ease) both;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.15rem;
  }

  .nav-link {
    justify-content: space-between;
    padding: 0.78rem 0.95rem;
    border-color: rgba(232, 240, 255, 0.08);
    border-radius: 0.95rem;
    font-size: 1rem;
  }

  .nav-link::before {
    order: 2;
  }

  .nav-cta {
    margin: 0.3rem 0 0;
    justify-content: center;
    padding-block: 0.7rem;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 2.2rem;
  }
}

@keyframes nav-shell-in {
  from {
    opacity: 0;
    transform: translateY(-0.35rem);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 760px) {
  .footer-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.6rem 1.2rem;
  }

  .footer-meta {
    gap: 0.5rem 1.1rem;
  }
}

@media (max-width: 600px) {
  h1 {
    letter-spacing: 0.01em;
  }

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

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

  .index-item {
    grid-template-columns: 2.6rem minmax(0, 1fr);
  }

  .index-meta {
    grid-column: 2;
  }

  .tag {
    font-size: 0.66rem;
  }
}

@media (max-width: 380px) {
  .brand-name {
    font-size: 0.92rem;
  }

  .nav-toggle-label {
    display: none;
  }
}

/* ---------- 15. 可访问性与动效偏好 ---------- */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

@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;
  }

  .site-header[data-open="true"] .site-nav {
    animation: none;
  }

  .scroll-meter-fill {
    transition: none;
  }
}

@media print {
  .site-header,
  .site-footer,
  .skip-link,
  .scroll-meter {
    display: none !important;
  }

  body {
    background: #ffffff;
    color: #0b1230;
  }
}