/* ==========================================================================
   乐宝体育 /assets/site.css — 共享外壳与通用组件
   夜间赛场指挥台：直角、细线、荧光青结构线、橙红数据点
   ========================================================================== */

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

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

body, h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ol, ul, fieldset {
  margin: 0;
  padding: 0;
}

ol, ul { list-style: none; }

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

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

a { color: inherit; }

[hidden] { display: none !important; }

/* ---------- 变量 ---------- */
:root {
  --ink-950: #060B14;
  --ink-900: #0A1220;
  --ink-800: #0E1A2B;
  --moss-900: #14251F;
  --moss-800: #0B1714;

  --cyan-400: #17E0C8;
  --cyan-500: #00A38C;
  --orange-500: #FF5A2B;
  --amber-400: #FFC24D;

  --paper-100: #F2F6FF;
  --paper-050: #E7EDF6;
  --slate-400: #8FA3BF;

  --line-soft: rgba(23, 224, 200, .16);
  --line-hair: rgba(143, 163, 191, .20);
  --line-strong: rgba(0, 163, 140, .55);
  --wash-cyan: rgba(23, 224, 200, .06);

  --font-display: "Arial Narrow", "Helvetica Neue Condensed", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --rail-w: 274px;
  --bar-h: 66px;
  --shell-w: 1220px;
  --gutter: clamp(18px, 4vw, 56px);

  --ease: cubic-bezier(.4, 0, .2, 1);
}

/* ---------- 基础版式 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-950);
  background-image:
    radial-gradient(1100px 620px at 82% -10%, rgba(23, 224, 200, .10), transparent 62%),
    radial-gradient(900px 520px at 4% 104%, rgba(255, 90, 43, .08), transparent 60%),
    linear-gradient(180deg, var(--ink-950) 0%, #070D19 46%, var(--ink-950) 100%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  color: var(--paper-100);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(143, 163, 191, .075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 163, 191, .075) 1px, transparent 1px);
  background-size: 72px 72px, 72px 72px;
  -webkit-mask-image: radial-gradient(120% 82% at 50% 0%, #000 0%, rgba(0, 0, 0, .45) 58%, transparent 100%);
  mask-image: radial-gradient(120% 82% at 50% 0%, #000 0%, rgba(0, 0, 0, .45) 58%, transparent 100%);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.005em;
  color: var(--paper-100);
  text-wrap: balance;
}

h1 { font-size: clamp(34px, 5.2vw, 64px); }
h2 { font-size: clamp(26px, 3.4vw, 40px); }
h3 { font-size: clamp(20px, 2.2vw, 28px); }

p { text-wrap: pretty; }

strong { font-weight: 700; }

:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

main {
  display: block;
  position: relative;
  z-index: 1;
}

#main-content { scroll-margin-block-start: 96px; }

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  inset-inline-start: 10px;
  z-index: 999;
  padding: 10px 18px;
  background: var(--cyan-400);
  color: #03211D;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform .2s var(--ease);
}

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

/* ==========================================================================
   品牌轨道 / site-header
   ========================================================================== */
.site-header {
  position: fixed;
  inset-block: 0;
  inset-inline-start: 0;
  z-index: 200;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  background-image: linear-gradient(180deg,
    rgba(14, 26, 43, .98) 0%,
    rgba(6, 11, 20, .995) 52%,
    rgba(20, 37, 31, .98) 100%);
  border-inline-end: 1px solid var(--line-soft);
  box-shadow: inset -1px 0 0 rgba(0, 163, 140, .22), 0 0 44px rgba(0, 0, 0, .5);
}

.rail {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  padding: 22px 20px 24px;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: rgba(23, 224, 200, .35) transparent;
}

.rail__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  flex: none;
}

/* ---------- 品牌 ---------- */
.brand {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  width: 100%;
  padding-block-end: 16px;
  border-block-end: 1px solid var(--line-hair);
  text-decoration: none;
  color: var(--paper-100);
}

.brand__mark {
  position: relative;
  flex: none;
  width: 34px;
  height: 34px;
  margin-block-start: 3px;
  background: var(--cyan-400);
  clip-path: polygon(0 0, 100% 0, 100% 66%, 66% 100%, 0 100%);
  overflow: hidden;
}

.brand__mark::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    transparent 44%,
    #060B14 44%,
    #060B14 56%,
    transparent 56%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.1;
  letter-spacing: .06em;
}

.brand__tag {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.4;
  letter-spacing: .18em;
  color: var(--slate-400);
}

/* ---------- 移动开关 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  background: rgba(23, 224, 200, .06);
  border: 1px solid var(--line-strong);
  color: var(--paper-100);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  cursor: pointer;
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}

.nav-toggle:hover {
  border-color: var(--cyan-400);
  background: rgba(23, 224, 200, .12);
}

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  transition: width .2s var(--ease);
}

.nav-toggle__bars span:nth-child(2) { width: 68%; }

.nav-toggle:hover .nav-toggle__bars span:nth-child(2),
.site-header[data-open] .nav-toggle__bars span:nth-child(2) { width: 100%; }

/* ---------- 面板 ---------- */
.rail__panel {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  margin-block-start: 18px;
}

/* ---------- 导航 ---------- */
.site-nav { flex: none; }

.site-nav__title {
  margin-block-end: 10px;
  padding-inline-start: 15px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--cyan-500);
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-nav__list a {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 11px;
  padding: 10px 12px 10px 15px;
  text-decoration: none;
  color: var(--slate-400);
  font-size: 15px;
  line-height: 1.4;
  letter-spacing: .02em;
  transition: color .18s var(--ease), background-color .18s var(--ease);
}

.site-nav__list a::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block: 7px;
  width: 3px;
  background: var(--cyan-400);
  transform: scaleY(0);
  transform-origin: center;
  transition: transform .24s var(--ease);
}

.site-nav__list a:hover {
  color: var(--paper-100);
  background: var(--wash-cyan);
}

.site-nav__list a[aria-current="page"] {
  color: var(--paper-100);
  font-weight: 600;
  background: linear-gradient(90deg, rgba(23, 224, 200, .16), rgba(23, 224, 200, 0) 88%);
}

.site-nav__list a[aria-current="page"]::before {
  transform: scaleY(1);
}

.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--cyan-500);
  transition: color .18s var(--ease);
}

.site-nav__list a[aria-current="page"] .site-nav__idx {
  color: var(--orange-500);
}

.site-nav__label { min-width: 0; }

/* ---------- 轨道底部动作区 ---------- */
.rail-actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-block-start: auto;
  padding-block-start: 22px;
}

.rail-hint {
  padding-inline-start: 10px;
  border-inline-start: 2px solid var(--line-strong);
  font-size: 12px;
  line-height: 1.65;
  color: var(--slate-400);
}

.quick-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.quick-chip {
  display: inline-block;
  padding: 5px 11px;
  font-size: 12px;
  letter-spacing: .06em;
  text-decoration: none;
  color: var(--paper-100);
  background: rgba(23, 224, 200, .05);
  border: 1px solid rgba(0, 163, 140, .5);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.quick-chip:hover {
  color: var(--cyan-400);
  border-color: var(--cyan-400);
  background: rgba(23, 224, 200, .12);
}

.rail-cta { width: 100%; }

/* ---------- 滚动计量条 ---------- */
.rail-meter {
  position: absolute;
  inset-block: 0;
  inset-inline-end: 0;
  width: 4px;
  background-color: rgba(143, 163, 191, .10);
  background-image: repeating-linear-gradient(180deg,
    rgba(143, 163, 191, .38) 0 1px,
    transparent 1px 12px);
  pointer-events: none;
}

.rail-meter__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg,
    var(--cyan-400) 0%,
    var(--cyan-400) 55%,
    var(--orange-500) 100%);
  transform: scaleY(var(--progress, 0));
  transform-origin: top center;
}

/* ==========================================================================
   通用按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 20px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .1em;
  text-decoration: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--paper-100);
  cursor: pointer;
  transition: background-color .18s var(--ease), color .18s var(--ease),
              border-color .18s var(--ease), transform .18s var(--ease);
}

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

.btn--primary {
  padding-inline-end: 27px;
  background: var(--orange-500);
  color: #170500;
  clip-path: polygon(0 0, 100% 0, calc(100% - 13px) 100%, 0 100%);
}

.btn--primary:hover { background: #FF7A52; }

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--cyan-400);
}

.btn--ghost:hover {
  border-color: var(--cyan-400);
  background: var(--wash-cyan);
  color: var(--paper-100);
}

.btn--cyan {
  background: var(--cyan-400);
  color: #03211D;
}

.btn--cyan:hover { background: #4FF0DC; }

/* ==========================================================================
   容器 / 网格 / 章节
   ========================================================================== */
.shell {
  width: 100%;
  max-width: var(--shell-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.2vw, 32px);
}

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.section { padding-block: clamp(40px, 6vw, 88px); }
.section--tight { padding-block: clamp(24px, 3.4vw, 48px); }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px 28px;
  margin-block-end: clamp(20px, 3vw, 36px);
}

.section__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.8vw, 32px);
  line-height: 1.1;
  letter-spacing: .01em;
}

.section__note {
  max-width: 46ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate-400);
}

/* ==========================================================================
   基础组件
   ========================================================================== */
.eyebrow {
  display: inline-block;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .16em;
  color: #170500;
  background: var(--orange-500);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.eyebrow--cyan {
  background: var(--cyan-400);
  color: #03211D;
}

.eyebrow--ghost {
  background: transparent;
  color: var(--cyan-400);
  border: 1px solid var(--line-strong);
  clip-path: none;
}

.tag-slant {
  display: inline-block;
  padding: 5px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--paper-100);
  background: rgba(23, 224, 200, .14);
  border-inline-start: 3px solid var(--cyan-400);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 100%, 0 100%);
}

.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px);
  background: linear-gradient(180deg, rgba(14, 26, 43, .92), rgba(10, 18, 32, .92));
  border: 1px solid var(--line-hair);
}

.panel::before {
  content: "";
  position: absolute;
  inset-block-start: -1px;
  inset-inline-start: -1px;
  width: 42px;
  height: 2px;
  background: var(--cyan-400);
}

.score-strip {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  padding: 14px clamp(14px, 2vw, 24px);
  background: linear-gradient(90deg,
    rgba(23, 224, 200, .10),
    rgba(14, 26, 43, .9) 40%,
    rgba(10, 18, 32, .9));
  border: 1px solid var(--line-soft);
  border-inline-start: 3px solid var(--orange-500);
}

.score-strip__score {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.1;
  color: var(--orange-500);
}

.score-strip__body { min-width: 0; }

.score-strip__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate-400);
}

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg,
    var(--line-strong),
    rgba(143, 163, 191, .12) 55%,
    transparent);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--slate-400);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--cyan-500);
}

.breadcrumb a {
  color: var(--slate-400);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.breadcrumb a:hover { color: var(--cyan-400); }

.breadcrumb [aria-current="page"] { color: var(--paper-100); }

/* ---------- 长文 ---------- */
.prose {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-100);
}

.prose > * + * { margin-block-start: 1.1em; }

.prose h2 {
  margin-block-start: 1.8em;
  font-size: clamp(22px, 2.6vw, 30px);
}

.prose h3 {
  margin-block-start: 1.6em;
  font-size: clamp(18px, 2vw, 22px);
}

.prose p { color: rgba(242, 246, 255, .86); }

.prose a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.prose a:hover { color: var(--orange-500); }

.prose ul,
.prose ol {
  display: flex;
  flex-direction: column;
  gap: .5em;
  padding-inline-start: 1.25em;
}

.prose ul { list-style: square; }
.prose ol { list-style: decimal; }

.prose li::marker { color: var(--cyan-500); }

.prose blockquote {
  padding-inline-start: 18px;
  border-inline-start: 3px solid var(--orange-500);
  color: var(--slate-400);
}

.prose code,
.prose kbd {
  padding: .1em .4em;
  font-family: var(--font-mono);
  font-size: .9em;
  background: rgba(23, 224, 200, .10);
}

/* ==========================================================================
   图片容器（供页面阶段放置占位图）
   ========================================================================== */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(135deg, var(--ink-800) 0%, var(--moss-900) 100%);
  border: 1px solid var(--line-soft);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(23, 224, 200, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 224, 200, .07) 1px, transparent 1px);
  background-size: 40px 40px, 40px 40px;
  opacity: .8;
}

.media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 1;
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3  { aspect-ratio: 4 / 3; }
.media--1x1  { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }

.media--slant {
  clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
}

.media__note {
  position: absolute;
  inset-block-end: 0;
  inset-inline: 0;
  z-index: 2;
  padding: 22px 14px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--paper-100);
  background: linear-gradient(180deg, transparent, rgba(6, 11, 20, .88));
}

/* ==========================================================================
   可展开内容组
   ========================================================================== */
.disclosure {
  border-block-end: 1px solid var(--line-hair);
}

.disclosure__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 18px 0;
  background: none;
  border: 0;
  color: var(--paper-100);
  font-family: var(--font-display);
  font-size: clamp(16px, 1.8vw, 20px);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: .01em;
  text-align: start;
  cursor: pointer;
  transition: color .18s var(--ease);
}

.disclosure__trigger:hover { color: var(--cyan-400); }

.disclosure__trigger::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan-400);
}

.disclosure__trigger[aria-expanded="true"]::after {
  content: "\2013";
  color: var(--orange-500);
}

.disclosure__panel {
  padding-block-end: 20px;
  color: var(--slate-400);
}

/* ==========================================================================
   进场动效
   ========================================================================== */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

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

/* ==========================================================================
   site-footer
   ========================================================================== */
.site-footer {
  position: relative;
  z-index: 1;
  margin-block-start: clamp(64px, 9vw, 128px);
  color: var(--paper-100);
  background-color: var(--moss-900);
  background-image:
    linear-gradient(rgba(23, 224, 200, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 224, 200, .055) 1px, transparent 1px),
    linear-gradient(180deg, rgba(20, 37, 31, .96) 0%, rgba(11, 23, 20, .98) 46%, #060B14 100%);
  background-size: 56px 56px, 56px 56px, auto;
  border-block-start: 1px solid var(--line-soft);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline: 0;
  height: 4px;
  background: linear-gradient(90deg,
    var(--cyan-400) 0%,
    var(--cyan-400) 42%,
    var(--orange-500) 42%,
    var(--orange-500) 62%,
    transparent 62%);
  opacity: .9;
}

.footer__inner {
  position: relative;
  width: 100%;
  max-width: var(--shell-w);
  margin-inline: auto;
  padding: clamp(38px, 6vw, 80px) var(--gutter) clamp(26px, 4vw, 44px);
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(24px, 3.4vw, 52px);
}

.footer__brand { grid-column: span 5; }

.footer__logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 3.6vw, 46px);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--paper-100);
}

.footer__tag {
  margin-block-start: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--cyan-400);
}

.footer__lede {
  margin-block-start: 14px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate-400);
}

.footer__cols {
  grid-column: span 7;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 32px);
}

.footer-col__title {
  margin-block-end: 12px;
  padding-block-end: 10px;
  border-block-end: 1px solid var(--line-hair);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--slate-400);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col__list a {
  display: inline-block;
  padding-block-end: 2px;
  font-size: 14px;
  color: var(--paper-100);
  text-decoration: none;
  background-image: linear-gradient(var(--cyan-400), var(--cyan-400));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0 1px;
  transition: color .18s var(--ease), background-size .22s var(--ease);
}

.footer-col__list a:hover {
  color: var(--cyan-400);
  background-size: 100% 1px;
}

.footer__contact {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  gap: clamp(18px, 3vw, 42px);
  align-items: start;
  margin-block-start: clamp(20px, 3vw, 40px);
  padding-block-start: clamp(20px, 3vw, 32px);
  border-block-start: 1px solid var(--line-hair);
}

.footer__note {
  padding-inline-start: 12px;
  border-inline-start: 2px solid var(--amber-400);
  font-size: 13px;
  line-height: 1.75;
  color: var(--slate-400);
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.contact-list__item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding-block-end: 10px;
  border-block-end: 1px solid rgba(143, 163, 191, .14);
}

.contact-list__item--wide {
  grid-template-columns: 84px minmax(0, 1fr) auto;
}

.contact-list__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan-500);
}

.contact-list__val {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  color: var(--paper-100);
  word-break: break-word;
}

.copy-btn {
  flex: none;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--slate-400);
  background: rgba(23, 224, 200, .05);
  border: 1px solid var(--line-hair);
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease),
              background-color .18s var(--ease);
}

.copy-btn:hover {
  color: var(--cyan-400);
  border-color: var(--line-strong);
  background: rgba(23, 224, 200, .12);
}

.copy-btn.is-done {
  color: #062A11;
  background: var(--cyan-400);
  border-color: var(--cyan-400);
}

.footer__base {
  position: relative;
  width: 100%;
  max-width: var(--shell-w);
  margin-inline: auto;
  padding: 16px var(--gutter) 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  border-block-start: 1px solid var(--line-hair);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--slate-400);
}

.footer__legal {
  margin-inline-end: auto;
  max-width: 60ch;
  line-height: 1.65;
}

.footer__meta { white-space: nowrap; }

/* ==========================================================================
   响应式：桌面外壳
   ========================================================================== */
@media (min-width: 1024px) {
  body { padding-inline-start: var(--rail-w); }
}

/* ==========================================================================
   响应式：1023px 以下 —— 轨道坍缩为顶部控制条 + 抽屉
   ========================================================================== */
@media (max-width: 1023px) {
  .site-header {
    position: sticky;
    inset-block: auto;
    inset-inline-start: auto;
    top: 0;
    width: 100%;
    height: var(--bar-h);
    flex-direction: row;
    border-inline-end: 0;
    border-block-end: 1px solid var(--line-soft);
    box-shadow: 0 12px 34px rgba(0, 0, 0, .48);
  }

  .rail {
    padding: 0 var(--gutter);
    justify-content: center;
    overflow: visible;
  }

  .rail__top {
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 14px;
  }

  .brand {
    width: auto;
    align-items: center;
    padding-block-end: 0;
    border-block-end: 0;
  }

  .brand__mark {
    width: 30px;
    height: 30px;
    margin-block-start: 0;
  }

  .brand__name { font-size: 17px; }

  .brand__tag {
    font-size: 9px;
    letter-spacing: .16em;
  }

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

  .rail__panel {
    position: fixed;
    inset-inline: 0;
    inset-block-start: var(--bar-h);
    max-height: calc(100dvh - var(--bar-h));
    margin-block-start: 0;
    padding: 18px var(--gutter) 30px;
    overflow-y: auto;
    overscroll-behavior: contain;
    background-image: linear-gradient(180deg, #0C1726 0%, #060B14 78%, #0B1714 100%);
    border-block-end: 1px solid var(--line-soft);
    box-shadow: 0 26px 64px rgba(0, 0, 0, .62);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
    z-index: 190;
  }

  .site-header[data-open] .rail__panel {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .rail-actions { margin-block-start: 22px; }

  .rail-meter {
    inset-block-start: auto;
    inset-block-end: 0;
    inset-inline: 0;
    width: auto;
    height: 3px;
    background-image: repeating-linear-gradient(90deg,
      rgba(143, 163, 191, .38) 0 1px,
      transparent 1px 12px);
  }

  .rail-meter__bar {
    transform: scaleX(var(--progress, 0));
    transform-origin: left center;
    background: linear-gradient(90deg,
      var(--cyan-400) 0%,
      var(--cyan-400) 55%,
      var(--orange-500) 100%);
  }

  .span-3, .span-4 { grid-column: span 6; }
  .span-5, .span-7 { grid-column: span 12; }

  .footer__brand { grid-column: span 12; }
  .footer__cols { grid-column: span 12; }
  .footer__contact { grid-template-columns: minmax(0, 1fr); }
}

/* ==========================================================================
   响应式：640px 以下
   ========================================================================== */
@media (max-width: 640px) {
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 12; }

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

  .contact-list__item,
  .contact-list__item--wide {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 4px 12px;
  }

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

  .footer__base {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .footer__legal { margin-inline-end: 0; }

  .score-strip {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }
}

/* ==========================================================================
   降低动效
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

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

  .rail-meter__bar { transition: none; }
}