/* ============================================================
   亚虎游戏攻略 · 共享控制台外壳 /assets/site.css
   深墨蓝机身 · 虎纹琥珀状态 · 荧光青交互 · 切角面板与细线网格
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::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,
p, ul, ol, dl, dd, figure, blockquote, hr {
  margin: 0;
}

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

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

a { color: inherit; }

button { font: inherit; color: inherit; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B1B2B;
  --panel: #122A3F;
  --cream: #F2EDE3;
  --amber: #F2A63B;
  --cyan: #38E8D0;
  --ice: #8FA6BF;
  --electric: #19D3FF;
  --rock: #5E6B78;
  --moss: #4F7A63;
  --clay: #B86B4B;

  --line: rgba(143, 166, 191, 0.22);
  --line-strong: rgba(143, 166, 191, 0.42);
  --line-soft: rgba(143, 166, 191, 0.14);

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

  --gutter: clamp(1.1rem, 3vw, 3rem);
  --wrap: 1320px;
  --radius-cut: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  --shadow-deep: 0 30px 60px -34px rgba(0, 0, 0, 0.95);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    linear-gradient(180deg, rgba(18, 42, 63, 0.92) 0%, rgba(11, 27, 43, 0) 30%),
    repeating-linear-gradient(0deg, rgba(143, 166, 191, 0.05) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(90deg, rgba(143, 166, 191, 0.05) 0 1px, transparent 1px 88px),
    radial-gradient(circle at 86% 0%, rgba(242, 166, 59, 0.15), transparent 46%),
    radial-gradient(circle at 3% 14%, rgba(56, 232, 208, 0.1), transparent 42%);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.nav-open { overflow: hidden; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.08;
  color: var(--cream);
}

h1 { font-size: clamp(2.6rem, 6vw, 4.5rem); line-height: 1.02; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.7rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); letter-spacing: -0.02em; }
h4 { font-size: 1.0625rem; letter-spacing: -0.01em; }

p { text-wrap: pretty; }

::selection { background: var(--amber); color: #1a1100; }

/* ---------- 4. 无障碍基础 ---------- */
:where(a, button, summary, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 2px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 200;
  transform: translateY(-220%);
  padding: 0.75rem 1.1rem;
  background: var(--amber);
  color: #1a1100;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.9375rem;
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: transform 0.18s ease;
}

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

/* ---------- 5. 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 22rem) minmax(0, 1fr);
  gap: clamp(1.2rem, 3vw, 3rem);
  align-items: start;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(0.8rem, 1.6vw, 1.6rem);
}

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--line-strong), transparent);
}

/* ---------- 6. 头部：控制台吸顶 ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(9, 22, 35, 0.98), rgba(18, 42, 63, 0.94));
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-strong);
  box-shadow: 0 18px 40px -34px rgba(0, 0, 0, 0.95);
  transition: box-shadow 0.22s ease, border-color 0.22s ease;
}

.masthead.is-scrolled {
  border-bottom-color: rgba(242, 166, 59, 0.4);
  box-shadow: 0 22px 46px -30px rgba(0, 0, 0, 1);
}

.masthead__rail {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.42rem var(--gutter);
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(90deg, rgba(242, 166, 59, 0.1), rgba(56, 232, 208, 0.05) 58%, transparent);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--ice);
}

.rail-status {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-width: 0;
  color: rgba(242, 237, 227, 0.84);
}

.rail-dot {
  width: 7px;
  height: 7px;
  flex: none;
  background: var(--amber);
  transform: rotate(45deg);
  box-shadow: 0 0 0 3px rgba(242, 166, 59, 0.18);
  animation: railPulse 2.6s ease-in-out infinite;
}

@keyframes railPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.32; }
}

.rail-links {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  flex: none;
}

.rail-links a {
  color: var(--ice);
  text-decoration: none;
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.rail-links a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.masthead__bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(0.8rem, 2vw, 2rem);
  padding: 0.8rem var(--gutter);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.15rem 0;
  text-decoration: none;
  color: inherit;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--amber);
  border: 1px solid rgba(242, 166, 59, 0.55);
  background:
    repeating-linear-gradient(135deg, rgba(242, 166, 59, 0.22) 0 3px, transparent 3px 9px),
    linear-gradient(160deg, #16334C, #0D1F31);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 0.12rem;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.02rem, 1.5vw, 1.22rem);
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--cream);
}

.brand__descriptor {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  color: var(--ice);
  white-space: nowrap;
}

/* 主导航 */
.site-nav { margin-left: auto; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.35rem, 1.5vw, 1.5rem);
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.2rem 0.1rem;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: rgba(242, 237, 227, 0.78);
  text-decoration: none;
  transition: color 0.16s ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.4rem;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.18s ease, background-color 0.18s ease;
}

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

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

.site-nav__foot { display: none; }

.site-nav__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.5rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  text-decoration: none;
  border: 1px solid rgba(56, 232, 208, 0.4);
  background: rgba(56, 232, 208, 0.06);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.site-nav__index:hover {
  background: rgba(56, 232, 208, 0.14);
  color: #CBFFF7;
}

.site-nav__cta { justify-content: center; }

/* 右端动作区 */
.masthead__actions {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.masthead__index {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-decoration: none;
  border: 1px solid rgba(56, 232, 208, 0.42);
  background: rgba(56, 232, 208, 0.05);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.masthead__index:hover {
  background: rgba(56, 232, 208, 0.14);
  border-color: var(--cyan);
  color: #CBFFF7;
}

/* 移动开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.55rem 0.8rem;
  background: rgba(18, 42, 63, 0.85);
  border: 1px solid var(--line-strong);
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: border-color 0.16s ease, background-color 0.16s ease;
}

.nav-toggle:hover { border-color: var(--amber); }

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
  flex: none;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: var(--amber);
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* 阅读进度线 */
.masthead__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--amber), var(--cyan));
  box-shadow: 0 0 12px rgba(56, 232, 208, 0.5);
  pointer-events: none;
}

/* ---------- 7. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.68rem 1.1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease, transform 0.16s ease;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--amber {
  background: var(--amber);
  color: #1A1100;
}

.btn--amber:hover { background: #FFBB5C; }

.btn--ghost {
  background: rgba(18, 42, 63, 0.7);
  border-color: var(--line-strong);
  color: var(--cream);
}

.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--cyan {
  background: var(--cyan);
  color: #052029;
}

.btn--cyan:hover { background: #6BF5E3; }

/* ---------- 8. 通用小组件 ---------- */
.panel {
  position: relative;
  padding: clamp(1.1rem, 2.4vw, 1.8rem);
  background: linear-gradient(165deg, rgba(18, 42, 63, 0.96), rgba(11, 27, 43, 0.98));
  border: 1px solid var(--line);
  clip-path: var(--radius-cut);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.26rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: #1A1100;
  background: var(--amber);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}

.tag--cyan {
  background: rgba(56, 232, 208, 0.16);
  color: var(--cyan);
  border: 1px solid rgba(56, 232, 208, 0.45);
}

.tag--ice {
  background: rgba(143, 166, 191, 0.16);
  color: var(--ice);
  border: 1px solid rgba(143, 166, 191, 0.4);
}

.tag--moss {
  background: rgba(79, 122, 99, 0.3);
  color: #BFE4CE;
  border: 1px solid rgba(79, 122, 99, 0.8);
}

.tag--clay {
  background: rgba(184, 107, 75, 0.28);
  color: #F0BDA4;
  border: 1px solid rgba(184, 107, 75, 0.75);
}

.data {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--amber);
}

.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--amber);
  flex: none;
}

.breadcrumbs { padding-block: 1rem 0; }

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--ice);
}

.breadcrumbs li + li::before {
  content: "／";
  margin-right: 0.35rem;
  color: var(--rock);
}

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

.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs [aria-current="page"] { color: var(--cream); }

/* 正文窄栏 */
.prose {
  max-width: 38em;
  font-size: clamp(1rem, 0.97rem + 0.2vw, 1.08rem);
  line-height: 1.78;
  color: rgba(242, 237, 227, 0.88);
}

.prose > * + * { margin-top: 1.05em; }
.prose h2 { margin-top: 1.8em; font-size: clamp(1.5rem, 2.6vw, 2rem); }
.prose h3 { margin-top: 1.6em; }
.prose strong { color: var(--cream); font-weight: 700; }
.prose a { color: var(--cyan); text-underline-offset: 3px; }
.prose ul { list-style: square; padding-left: 1.2em; }
.prose ol { list-style: decimal; padding-left: 1.4em; }
.prose li + li { margin-top: 0.4em; }
.prose li::marker { color: var(--amber); }
.prose blockquote {
  border-left: 2px solid var(--amber);
  padding-left: 1rem;
  color: rgba(242, 237, 227, 0.75);
}
.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--electric);
  background: rgba(25, 211, 255, 0.08);
  padding: 0.1em 0.35em;
}

/* ---------- 9. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background:
    repeating-linear-gradient(135deg, rgba(143, 166, 191, 0.09) 0 2px, transparent 2px 12px),
    linear-gradient(150deg, #14314A, #0A1826);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(135deg, rgba(242, 166, 59, 0.1) 0 1px, transparent 1px 14px),
    linear-gradient(180deg, transparent 58%, rgba(11, 27, 43, 0.62));
  opacity: 0.35;
}

.media-frame--plain::after { display: none; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 0.45rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--ice);
  background: rgba(8, 19, 31, 0.82);
}

/* ---------- 10. 显现动效 ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 7rem);
  background: linear-gradient(180deg, rgba(18, 42, 63, 0.55), #08131F 58%, #060F19);
  border-top: 1px solid var(--line-strong);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(280px, 45%);
  height: 2px;
  background: linear-gradient(90deg, var(--amber), rgba(56, 232, 208, 0.5) 60%, transparent);
}

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.95fr) minmax(0, 1.1fr);
  gap: clamp(1.6rem, 4vw, 3.5rem);
  max-width: 1600px;
  margin-inline: auto;
  padding: clamp(2.2rem, 5vw, 3.6rem) var(--gutter) clamp(1.8rem, 4vw, 2.8rem);
  border-bottom: 1px solid var(--line-soft);
}

.footer-brand__mark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--cream);
}

.footer-brand__mark::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 0.6rem;
  background: var(--amber);
  transform: rotate(45deg) translateY(-2px);
}

.footer-brand__line {
  margin-top: 0.7rem;
  max-width: 28em;
  font-size: 1rem;
  color: rgba(242, 237, 227, 0.76);
}

.footer-brand__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
}

.footer-brand__tags li {
  padding: 0.22rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--amber);
  border: 1px solid rgba(242, 166, 59, 0.38);
  background: rgba(242, 166, 59, 0.07);
}

.footer-brand__note {
  margin-top: 1.1rem;
  padding-left: 0.7rem;
  border-left: 2px solid var(--moss);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.05em;
  color: var(--ice);
}

.footer-heading {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--amber);
  padding-bottom: 0.55rem;
  border-bottom: 1px dashed rgba(143, 166, 191, 0.3);
}

.footer-links ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 0.9rem;
  margin-top: 0.8rem;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  font-size: 0.9375rem;
  color: rgba(242, 237, 227, 0.8);
  text-decoration: none;
  transition: color 0.16s ease;
}

.footer-links a::before {
  content: "";
  width: 8px;
  height: 1px;
  flex: none;
  background: var(--amber);
  transition: width 0.16s ease, background-color 0.16s ease;
}

.footer-links a:hover { color: var(--cyan); }
.footer-links a:hover::before { width: 15px; background: var(--cyan); }

.footer-facts__list {
  display: grid;
  gap: 0.8rem;
  margin-top: 0.9rem;
}

.footer-facts__row {
  display: grid;
  gap: 0.1rem;
}

.footer-facts__term {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  color: var(--ice);
}

.footer-facts__value {
  font-size: 0.9375rem;
  color: rgba(242, 237, 227, 0.9);
  overflow-wrap: anywhere;
}

.footer-facts__mono {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.6rem;
  max-width: 1600px;
  margin-inline: auto;
  padding: 1rem var(--gutter) 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--ice);
}

.footer-copy { color: rgba(242, 237, 227, 0.72); }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 1.1rem;
}

.footer-legal a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  color: var(--ice);
  text-decoration: none;
  transition: color 0.16s ease;
}

.footer-legal a:hover { color: var(--amber); }

.footer-icp {
  color: rgba(242, 237, 227, 0.82);
  letter-spacing: 0.06em;
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1100px) {
  .nav-toggle { display: inline-flex; }

  .masthead__bar {
    grid-template-columns: minmax(0, 1fr) auto auto;
    gap: 0.6rem;
  }

  .masthead__index { display: none; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin: 0;
    padding: 0 var(--gutter);
    background: linear-gradient(180deg, #132C42, #0A1826 90%);
    border-bottom: 1px solid var(--line-strong);
    box-shadow: 0 30px 50px -30px #000;
    max-height: 0;
    opacity: 0;
    visibility: hidden;
    overflow: hidden;
    transform: translateY(-10px);
    transition: max-height 0.26s ease, opacity 0.2s ease, transform 0.24s ease, visibility 0.24s;
  }

  .site-nav[data-open="true"] {
    max-height: min(78vh, 640px);
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.3rem 0;
  }

  .site-nav__list li + li { border-top: 1px solid var(--line-soft); }

  .site-nav__link {
    width: 100%;
    min-height: 52px;
    padding: 0.6rem 0;
    font-size: 1rem;
  }

  .site-nav__link::after { display: none; }

  .site-nav__link[aria-current="page"] {
    padding-left: 0.7rem;
    background: linear-gradient(90deg, rgba(242, 166, 59, 0.16), transparent 70%);
  }

  .site-nav__foot {
    display: grid;
    gap: 0.6rem;
    padding: 0.9rem 0 1.3rem;
  }

  .footer-links ul { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 1080px) {
  .site-footer__top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

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

@media (max-width: 900px) {
  .split { grid-template-columns: minmax(0, 1fr); }
  .grid-12 > * { grid-column: 1 / -1 !important; }
}

@media (max-width: 720px) {
  .masthead__bar { grid-template-columns: minmax(0, 1fr) auto; }
  .masthead__actions { display: none; }
  .rail-links { display: none; }

  .rail-status {
    font-size: 0.625rem;
    letter-spacing: 0.03em;
  }

  .brand__mark {
    width: 2.4rem;
    height: 2.4rem;
    font-size: 0.75rem;
  }

  .brand__descriptor {
    font-size: 0.6rem;
    letter-spacing: 0.1em;
  }

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

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

@media (max-width: 420px) {
  .brand__descriptor { display: none; }
}

/* ---------- 13. 减少动态偏好 ---------- */
@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;
    scroll-behavior: auto !important;
  }

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

  .btn:hover { transform: none; }
}