/* =========================================================
   九游赛场 · 共享站点样式 /assets/site.css
   轨道导航 + 纵向长卷 + 记分牌配色
   ========================================================= */

/* ---------- 0. 设计变量 ---------- */
:root {
  --night: #080D0A;
  --ink-green: #0E2018;
  --pitch: #153A2A;
  --ember: #FF5A1F;
  --ash: #C73512;
  --white: #F3F6F2;
  --cyan: #3DF5D0;
  --steel: #7E8C84;
  --warm: #B9C2BB;
  --ember-ghost: rgba(255, 90, 31, 0.14);

  --line: rgba(243, 246, 242, 0.1);
  --line-soft: rgba(243, 246, 242, 0.06);
  --cyan-line: rgba(61, 245, 208, 0.28);

  --rail-w: 104px;
  --header-h: 60px;
  --gutter: clamp(18px, 4vw, 56px);
  --content-max: 1200px;

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SF Mono", ui-monospace, "Courier New", monospace;

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --cut: 20px;
}

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

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

body {
  margin: 0;
  padding-top: var(--header-h);
  background-color: var(--night);
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }

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

::selection { background: var(--ember); color: #080D0A; }

html.is-nav-open,
html.is-nav-open body { overflow: hidden; }

/* ---------- 2. 排版基线 ---------- */
h1, .h1 {
  font-family: var(--font-sans);
  font-size: clamp(34px, 6.4vw, 96px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
}

h2, .h2 {
  font-family: var(--font-sans);
  font-size: clamp(26px, 3.6vw, 52px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.012em;
}

h3, .h3 {
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 800;
  line-height: 1.32;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: 0.02em;
  font-weight: 700;
}

/* ---------- 3. 通用布局 ---------- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(44px, 7vw, 96px); }

.grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 32px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 4. 基础组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ember);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.btn--primary {
  background: var(--ember);
  color: #0A0F0C;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}
.btn--primary:hover { background: var(--cyan); transform: translateY(-2px); }
.btn--primary:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px #080D0A, inset 0 0 0 4px var(--cyan);
}

.btn--ghost {
  border-color: rgba(243, 246, 242, 0.24);
  color: var(--white);
  background: transparent;
}
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
  background: rgba(61, 245, 208, 0.1);
  border: 1px solid var(--cyan-line);
}
.tag--ember {
  color: var(--ember);
  background: var(--ember-ghost);
  border-color: rgba(255, 90, 31, 0.34);
}

.panel {
  position: relative;
  background: var(--ink-green);
  border: 1px solid var(--line);
  padding: clamp(20px, 3vw, 34px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}
.panel--left {
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 20px 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel);
}
.breadcrumbs a {
  color: var(--steel);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.breadcrumbs a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.breadcrumbs__sep { color: rgba(126, 140, 132, 0.55); }
.breadcrumbs [aria-current="page"] { color: var(--warm); }

.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--warm);
}
.prose h2 { margin: 2em 0 0.6em; color: var(--white); font-size: clamp(22px, 2.6vw, 32px); }
.prose h3 { margin: 1.6em 0 0.5em; color: var(--white); }
.prose p + p { margin-top: 1em; }
.prose ul { margin: 1em 0; padding-left: 0; }
.prose li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 0.5em;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 2px;
  background: var(--ember);
}

.rule { height: 1px; background: var(--line); border: 0; margin: 0; }
.track-line {
  height: 2px;
  border: 0;
  margin: 0;
  background: repeating-linear-gradient(90deg, var(--ember) 0 14px, transparent 14px 28px);
  opacity: 0.5;
}

/* ---------- 5. 图片容器（页面阶段复用） ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 20% 0%, rgba(61, 245, 208, 0.1), transparent 60%),
    linear-gradient(145deg, var(--pitch), var(--night) 78%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}
.media-frame img,
.media-frame picture,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.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__label {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  background: rgba(8, 13, 10, 0.8);
  border-top: 1px solid var(--cyan-line);
}

/* ---------- 6. 可展开内容组 ---------- */
.acc-list { border-top: 1px solid var(--line); }
.acc-item { border-bottom: 1px solid var(--line); }
.acc-trigger {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
  text-align: left;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
  transition: color 0.18s var(--ease);
}
.acc-trigger::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--ember);
  transition: transform 0.22s var(--ease);
}
.acc-trigger[aria-expanded="true"] { color: var(--cyan); }
.acc-trigger[aria-expanded="true"]::after { transform: rotate(45deg); }
.acc-trigger:hover { color: var(--cyan); }
.acc-panel {
  overflow: hidden;
  height: 0;
  transition: height 0.22s var(--ease);
}
.acc-panel__inner {
  padding: 0 0 20px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--warm);
}

/* ---------- 7. 跳动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 8. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--ember);
  color: #080D0A;
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.06em;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 0.18s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 9. 站点头部 · 左侧轨道 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 90;
  display: flex;
  flex-direction: column;
  padding: 18px 0 0;
  background: linear-gradient(180deg, #0B1711 0%, var(--night) 46%, var(--night) 100%);
  border-right: 1px solid rgba(243, 246, 242, 0.09);
}

.brand-lockup {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 0 8px 16px;
  text-decoration: none;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: var(--ember);
  color: #0A0F0C;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 800;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  box-shadow: 0 0 24px rgba(255, 90, 31, 0.35);
  transition: background-color 0.18s var(--ease);
}
.brand-lockup:hover .brand-mark { background: var(--cyan); }
.brand-text { display: block; min-width: 0; text-align: center; }
.brand-name {
  display: block;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  line-height: 1.4;
  color: var(--white);
}
.brand-latin {
  display: block;
  font-family: var(--font-mono);
  font-size: 7.5px;
  letter-spacing: 0.18em;
  line-height: 1.5;
  color: var(--steel);
  white-space: nowrap;
}

.rail-nav {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 10px 0;
  overflow-y: auto;
}
.rail-nav__list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.rail-nav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 9px 4px;
  text-align: center;
  color: var(--steel);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.rail-nav__index {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  opacity: 0.65;
  transition: color 0.18s var(--ease), opacity 0.18s var(--ease);
}
.rail-nav__label {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.3;
}
.rail-nav__link:hover {
  color: var(--white);
  background-color: rgba(243, 246, 242, 0.045);
}
.rail-nav__link:hover .rail-nav__index { opacity: 1; color: var(--cyan); }
.rail-nav__link[aria-current="page"] {
  color: var(--white);
  background-color: var(--ember-ghost);
}
.rail-nav__link[aria-current="page"] .rail-nav__index { opacity: 1; color: var(--ember); }
.rail-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: var(--ember);
  box-shadow: 0 0 14px rgba(255, 90, 31, 0.7);
}

.rail-cta {
  flex: 0 0 auto;
  display: block;
  margin: 10px 8px 14px;
  padding: 12px 4px;
  text-align: center;
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 0.1em;
  line-height: 1.35;
  color: #0A0F0C;
  background: var(--ember);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: background-color 0.18s var(--ease), transform 0.18s var(--ease);
}
.rail-cta:hover { background: var(--cyan); transform: translateY(-2px); }
.rail-cta:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px #080D0A, inset 0 0 0 4px var(--cyan);
}

.rail-progress {
  position: absolute;
  top: 0;
  right: 0;
  width: 2px;
  height: 100%;
  background: rgba(243, 246, 242, 0.07);
  pointer-events: none;
}
.rail-progress__bar {
  display: block;
  width: 100%;
  height: 0;
  background: linear-gradient(180deg, var(--cyan), rgba(61, 245, 208, 0.35));
  box-shadow: 0 0 10px rgba(61, 245, 208, 0.55);
}

/* ---------- 10. 移动导航按钮 + 抽屉 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  height: 38px;
  padding: 0 14px;
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  background: rgba(243, 246, 242, 0.05);
  border: 1px solid rgba(243, 246, 242, 0.2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
}
.nav-toggle__bars span:nth-child(2) { width: 72%; }
.nav-toggle__bars span:nth-child(3) { width: 46%; background: var(--ember); }
.nav-toggle__text { line-height: 1; }

.nav-drawer {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: flex;
  flex-direction: column;
  padding: 16px 20px 30px;
  overflow-y: auto;
  background:
    radial-gradient(100% 60% at 100% 0%, rgba(255, 90, 31, 0.12), transparent 60%),
    linear-gradient(180deg, #0B1711, var(--night) 55%);
  border-bottom: 1px solid var(--cyan-line);
  visibility: hidden;
  transform: translateY(-100%);
  transition: transform 0.3s var(--ease), visibility 0s linear 0.3s;
}
.nav-drawer[data-open="true"] {
  visibility: visible;
  transform: none;
  transition: transform 0.3s var(--ease), visibility 0s linear 0s;
}

.nav-drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.nav-drawer__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--steel);
}
.nav-drawer__close {
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--white);
  border: 1px solid rgba(243, 246, 242, 0.22);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.nav-drawer__close:hover { border-color: var(--ember); color: var(--ember); }

.nav-drawer__nav { padding-top: 6px; }
.nav-drawer__list { display: flex; flex-direction: column; }
.nav-drawer__link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 6px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--warm);
  border-bottom: 1px solid var(--line-soft);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.nav-drawer__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--steel);
}
.nav-drawer__link:hover { color: var(--white); }
.nav-drawer__link[aria-current="page"] {
  color: var(--white);
  background: linear-gradient(90deg, var(--ember-ghost), transparent 72%);
}
.nav-drawer__link[aria-current="page"] .nav-drawer__index { color: var(--ember); }

.nav-drawer__cta {
  display: block;
  margin-top: 22px;
  padding: 15px 10px;
  text-align: center;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: #0A0F0C;
  background: var(--ember);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}
.nav-drawer__cta:hover { background: var(--cyan); }
.nav-drawer__cta:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px #080D0A, inset 0 0 0 4px var(--cyan);
}

.nav-drawer__status {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 11. 站点页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 130px);
  background: var(--ink-green);
  border-top: 1px solid var(--line);
}
.site-footer__stripe {
  height: 8px;
  background: repeating-linear-gradient(
    115deg,
    var(--ember) 0 18px,
    var(--night) 18px 26px,
    rgba(255, 90, 31, 0.28) 26px 34px,
    var(--night) 34px 52px
  );
  border-bottom: 1px solid var(--line-soft);
}

.site-footer__inner {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: clamp(34px, 5.5vw, 70px) var(--gutter) 0;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
}

.site-footer__brand { min-width: 0; }
.footer-lockup {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.footer-lockup__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--ember);
  color: #0A0F0C;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
  transition: background-color 0.18s var(--ease);
}
.footer-lockup:hover .footer-lockup__mark { background: var(--cyan); }
.footer-lockup__text {
  display: block;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1.2;
  color: var(--white);
}
.footer-lockup__text em {
  display: block;
  margin-top: 4px;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  color: var(--steel);
}
.site-footer__tagline {
  margin-top: 16px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--warm);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 4vw, 40px);
  min-width: 0;
}
.footer-col { min-width: 0; }
.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--steel);
}
.footer-col__title::before {
  content: "/";
  margin-right: 6px;
  color: var(--ember);
}
.footer-col__list { display: flex; flex-direction: column; gap: 10px; }
.footer-col__link {
  position: relative;
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14.5px;
  color: var(--warm);
  transition: color 0.18s var(--ease);
}
.footer-col__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--cyan);
  transition: width 0.22s var(--ease);
}
.footer-col__link:hover { color: var(--white); }
.footer-col__link:hover::after { width: 100%; }

.site-footer__contact {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 140px minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(16px, 3vw, 40px);
  padding-top: clamp(22px, 3.5vw, 38px);
  border-top: 1px solid var(--line);
}
.site-footer__contact-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  line-height: 1.9;
}
.footer-contact { display: flex; flex-direction: column; gap: 10px; }
.footer-contact__item {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
}
.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--steel);
}
.footer-contact__value {
  font-size: 14px;
  line-height: 1.7;
  color: var(--warm);
  overflow-wrap: break-word;
  word-break: break-word;
}
.footer-contact__note {
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--steel);
  max-width: 38ch;
}

.site-footer__bottom {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  margin-top: clamp(26px, 4vw, 48px);
  padding: 18px var(--gutter) 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--line-soft);
}
.site-footer__legal {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--steel);
}
.site-footer__copy {
  font-size: 12px;
  color: var(--steel);
}
.site-footer__copy span {
  font-family: var(--font-mono);
  color: var(--warm);
}

/* ---------- 12. 响应式 ---------- */
@media (min-width: 901px) {
  body {
    padding-top: 0;
    padding-left: var(--rail-w);
  }
  .nav-drawer { display: none; }
  .nav-toggle { display: none; }
}

@media (max-width: 900px) {
  .site-header {
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: var(--header-h);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 0 14px;
    border-right: 0;
    border-bottom: 1px solid rgba(243, 246, 242, 0.1);
    background: rgba(8, 13, 10, 0.94);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
  }
  .brand-lockup {
    flex-direction: row;
    align-items: center;
    gap: 10px;
    padding: 0;
  }
  .brand-mark { width: 34px; height: 34px; font-size: 17px; }
  .brand-text { text-align: left; }
  .brand-name { font-size: 13px; letter-spacing: 0.1em; }
  .brand-latin { font-size: 7px; letter-spacing: 0.18em; }
  .rail-nav,
  .rail-cta,
  .rail-progress { display: none; }
  .nav-toggle { display: inline-flex; }
}

@media (max-width: 860px) {
  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .site-footer__contact { grid-template-columns: minmax(0, 1fr); }
  .footer-contact__note { max-width: none; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { gap: 22px 18px; }
  .footer-contact__item { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .site-footer__bottom { flex-direction: column; align-items: flex-start; gap: 8px; }
  .nav-drawer__link { font-size: 16px; padding: 14px 4px; }
}

@media (max-width: 400px) {
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 13. 减少动效 ---------- */
@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;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .rail-cta:hover,
  .btn--primary:hover { transform: none; }
}