/* ==========================================================================
   九游体育 · 共享 Site Kit
   夜场转播间 / 纵向叙事长卷 / 侧边轨道导航
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

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

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

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

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

a { color: inherit; text-decoration: none; }

/* 2. 变量 ---------------------------------------------------------------- */
:root {
  --ink: #0A0E14;
  --floodlight: #111823;
  --arc: #1FE0D8;
  --arc-soft: rgba(31, 224, 216, .12);
  --arc-line: rgba(31, 224, 216, .34);
  --deep-cyan: #0C5F5C;
  --pit: #FF3B4E;
  --countdown: #E9FF5A;
  --amber: #FFB347;
  --steel: #C3CDD9;
  --mist: #7B879A;
  --warm: #F4F7FA;
  --line: rgba(195, 205, 217, .14);
  --line-strong: rgba(195, 205, 217, .26);
  --rail-w: 236px;
  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 22px;
  --ease: cubic-bezier(.22, 1, .36, 1);
  --dur: .28s;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", ui-monospace, "JetBrains Mono", "Roboto Mono", Menlo, Consolas, "Courier New", monospace;
  --font-display: "Arial Narrow", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Helvetica, Arial, sans-serif;
  --shadow-glow: 0 0 0 1px rgba(31, 224, 216, .22), 0 18px 40px -24px rgba(31, 224, 216, .55);
}

/* 3. 基础排版 ------------------------------------------------------------- */
body {
  background: var(--ink);
  color: var(--steel);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  min-height: 100vh;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body[data-scroll-lock] { overflow: hidden; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--warm);
  line-height: 1.14;
  letter-spacing: -.015em;
  text-wrap: balance;
}

h1 { font-size: clamp(2.1rem, 5.4vw, 3.6rem); }
h2 { font-size: clamp(1.5rem, 3.4vw, 2.2rem); }
h3 { font-size: clamp(1.15rem, 2.2vw, 1.45rem); }

p { text-wrap: pretty; }

strong { color: var(--warm); }

:focus-visible {
  outline: 2px solid var(--arc);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection { background: var(--arc); color: #04201F; }

/* 4. 背景纹理 ------------------------------------------------------------- */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(244, 247, 250, .022) 0 1px,
    rgba(244, 247, 250, 0) 1px 4px
  );
}

/* 5. 辅助类 --------------------------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: .03em;
  color: var(--warm);
  overflow-wrap: anywhere;
}

#main-content { scroll-margin-top: 84px; }

/* 6. Skip link ------------------------------------------------------------ */
.skip-link {
  position: absolute;
  top: -120px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--arc);
  color: #04201F;
  font-weight: 700;
  font-size: 14px;
  border-radius: 0 0 12px 12px;
  transition: top .2s var(--ease);
}

.skip-link:focus { top: 0; }

/* 7. 侧边轨道头部 --------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--rail-w);
  height: 100vh;
  height: 100dvh;
  z-index: 60;
  background: linear-gradient(180deg, #0E1521 0%, #0A0E14 62%, #0A0E14 100%);
  border-right: 1px solid var(--line);
}

.site-header::after {
  content: "";
  position: absolute;
  top: 0;
  right: -1px;
  width: 1px;
  height: 100%;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(31, 224, 216, 0) 0%,
    rgba(31, 224, 216, .55) 12%,
    rgba(31, 224, 216, 0) 48%,
    rgba(233, 255, 90, .32) 100%
  );
}

.header-rail {
  display: flex;
  flex-direction: column;
  gap: 16px;
  height: 100%;
  padding: 22px 16px 20px;
  overflow-y: auto;
  scrollbar-width: thin;
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
}

.brand__mark {
  flex: 0 0 38px;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: #04201F;
  background: linear-gradient(140deg, var(--arc), #12A9A3);
  border-radius: 11px 11px 11px 3px;
  box-shadow: 0 0 0 1px rgba(31, 224, 216, .35), 0 10px 24px -14px rgba(31, 224, 216, .9);
}

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

.brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: .02em;
  color: var(--warm);
}

.brand__line {
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}

.brand__tagline {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  gap: 8px;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-indent: .22em;
  color: var(--countdown);
  border: 1px dashed rgba(233, 255, 90, .35);
  border-radius: 999px;
}

.brand__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--countdown);
  box-shadow: 0 0 10px var(--countdown);
  animation: rail-pulse 2.4s var(--ease) infinite;
}

@keyframes rail-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .35; transform: scale(.72); }
}

/* 导航 */
.side-nav {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
}

.side-nav__label {
  padding: 0 10px;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--mist);
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 10px 10px 8px;
  border-left: 2px solid transparent;
  border-radius: 10px;
  font-size: 15px;
  color: var(--steel);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-link:hover {
  background: rgba(31, 224, 216, .08);
  color: var(--warm);
}

.nav-link:hover .nav-index { color: var(--arc); }

.nav-link[aria-current="page"] {
  background: linear-gradient(90deg, rgba(31, 224, 216, .18), rgba(31, 224, 216, .02));
  border-left-color: var(--arc);
  color: var(--warm);
  font-weight: 600;
}

.nav-link[aria-current="page"] .nav-index { color: var(--arc); }

.nav-index {
  flex: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.nav-text { flex: 1 1 auto; min-width: 0; }

.nav-foot {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 18px;
  border-top: 1px dashed var(--line-strong);
}

.nav-hint {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--mist);
}

.nav-hint__dot {
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--pit);
  box-shadow: 0 0 10px rgba(255, 59, 78, .85);
}

/* 移动端菜单按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 0 14px;
  background: rgba(31, 224, 216, .08);
  border: 1px solid var(--arc-line);
  border-radius: 999px;
  color: var(--warm);
  font-size: 14px;
  letter-spacing: .08em;
  cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover { background: rgba(31, 224, 216, .16); }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .22s var(--ease), opacity .22s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 阅读进度 */
.rail-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(195, 205, 217, .10);
  overflow: hidden;
}

.rail-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--deep-cyan), var(--arc) 45%, var(--countdown));
  transition: width .1s linear;
}

/* 8. 页脚 ----------------------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: 96px;
  background: #070A0F;
  border-top: 1px solid var(--line);
  color: var(--mist);
}

.site-footer::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--arc) 0 26%,
    var(--countdown) 26% 34%,
    var(--pit) 34% 41%,
    var(--deep-cyan) 41% 100%
  );
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.2fr) minmax(0, 1.5fr);
  gap: 40px;
  padding-top: 52px;
  padding-bottom: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-pitch {
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

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

.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--arc);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  color: var(--steel);
  transition: color var(--dur) var(--ease);
}

.footer-links a::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--deep-cyan);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.footer-links a:hover { color: var(--arc); }

.footer-links a:hover::before {
  background: var(--arc);
  box-shadow: 0 0 10px var(--arc);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.footer-contact__row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel);
}

.footer-contact__k {
  min-width: 64px;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}

.footer-note {
  margin-top: 2px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.copy-btn {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 34px;
  padding: 0 14px;
  background: rgba(31, 224, 216, .08);
  border: 1px solid var(--arc-line);
  border-radius: 999px;
  color: var(--arc);
  font-size: 12.5px;
  letter-spacing: .06em;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.copy-btn:hover {
  background: rgba(31, 224, 216, .18);
  color: var(--warm);
}

.copy-btn[data-copied] {
  background: var(--arc);
  border-color: var(--arc);
  color: #04201F;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  padding-top: 18px;
  padding-bottom: 30px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--mist);
}

.footer-bottom__copy { color: var(--steel); }

.footer-bottom__legal {
  font-family: var(--font-mono);
  letter-spacing: .04em;
}

.footer-bottom__addr { color: var(--mist); }

/* 9. 按钮 ----------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: .06em;
  cursor: pointer;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.btn--primary {
  background: var(--arc);
  color: #04201F;
  box-shadow: 0 12px 30px -18px rgba(31, 224, 216, .9);
}

.btn--primary:hover {
  background: #4BF0E8;
  transform: translateY(-2px);
  box-shadow: 0 18px 34px -16px rgba(31, 224, 216, .85);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--steel);
}

.btn--ghost:hover {
  border-color: var(--arc);
  background: rgba(31, 224, 216, .07);
  color: var(--arc);
}

.btn--block { width: 100%; }

.btn--sm {
  min-height: 38px;
  padding: 0 16px;
  font-size: 13px;
}

/* 10. 标签 ---------------------------------------------------------------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist);
}

.tag--arc {
  color: var(--arc);
  border-color: var(--arc-line);
  background: var(--arc-soft);
}

.tag--pit {
  color: var(--pit);
  border-color: rgba(255, 59, 78, .42);
  background: rgba(255, 59, 78, .12);
}

.tag--countdown {
  color: var(--countdown);
  border-color: rgba(233, 255, 90, .4);
  background: rgba(233, 255, 90, .1);
}

.tag--amber {
  color: var(--amber);
  border-color: rgba(255, 179, 71, .42);
  background: rgba(255, 179, 71, .1);
}

/* 11. 容器 / 章节 --------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

.section { padding: 64px 0; }

.section--tight { padding: 36px 0; }

.section__head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 72ch;
  margin-bottom: 32px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--arc);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--arc);
  box-shadow: 0 0 12px var(--arc);
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.015em;
  color: var(--warm);
}

.section__lead {
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--steel);
}

.band {
  height: 3px;
  width: 100%;
  margin: 48px 0;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--arc), var(--deep-cyan) 55%, transparent);
}

.divider {
  height: 1px;
  margin: 40px 0;
  border: 0;
  background: var(--line);
}

/* 12. 网格 / 卡片 --------------------------------------------------------- */
.grid {
  display: grid;
  gap: 22px;
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.grid--split {
  grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr);
  align-items: start;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px;
  background: linear-gradient(160deg, rgba(17, 24, 35, .95), rgba(10, 14, 20, .95));
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  transition: transform .26s var(--ease), border-color .26s var(--ease), box-shadow .26s var(--ease);
}

.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  background: linear-gradient(180deg, rgba(31, 224, 216, .14), transparent 44%);
  transition: opacity .26s var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--arc-line);
  box-shadow: var(--shadow-glow);
}

.card:hover::after { opacity: 1; }

.card__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--warm);
}

.card__body {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--steel);
}

.card__meta {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--mist);
}

/* 13. 图片容器基础 -------------------------------------------------------- */
.media {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
}

.media__frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(150deg, #141D2A, #0A0E14 62%);
}

.media__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    115deg,
    rgba(31, 224, 216, .06) 0 2px,
    rgba(31, 224, 216, 0) 2px 22px
  );
}

.media__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(10, 14, 20, 0) 46%, rgba(10, 14, 20, .74) 100%);
}

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__cap {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.media--wide .media__frame { aspect-ratio: 21 / 9; }
.media--tall .media__frame { aspect-ratio: 4 / 5; }
.media--square .media__frame { aspect-ratio: 1 / 1; }

/* 14. 比分牌数字 ---------------------------------------------------------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4.4vw, 2.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--countdown);
}

.stat__label {
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--mist);
}

/* 15. 面包屑 -------------------------------------------------------------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 22px;
  font-size: 12.5px;
  color: var(--mist);
}

.breadcrumb a {
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

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

.breadcrumb__sep { color: var(--deep-cyan); }

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

/* 16. 长文排版 ------------------------------------------------------------ */
.prose {
  max-width: 70ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--steel);
}

.prose > * + * { margin-top: 1.05em; }

.prose h2 {
  margin-top: 1.9em;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--warm);
}

.prose h3 {
  margin-top: 1.6em;
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--warm);
}

.prose a {
  color: var(--arc);
  text-decoration: underline;
  text-decoration-color: rgba(31, 224, 216, .4);
  text-underline-offset: 3px;
}

.prose a:hover { text-decoration-color: var(--arc); }

.prose ul,
.prose ol { padding-left: 1.3em; }

.prose li + li { margin-top: .4em; }

.prose blockquote {
  margin: 1.6em 0;
  padding: 14px 20px;
  border-left: 3px solid var(--arc);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: rgba(31, 224, 216, .05);
  color: var(--warm);
}

.prose code {
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: .9em;
  color: var(--arc);
  background: rgba(31, 224, 216, .1);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--arc);
}

.link-arrow::after {
  content: "→";
  transition: transform .2s var(--ease);
}

.link-arrow:hover::after { transform: translateX(4px); }

/* 17. 动效协议 ------------------------------------------------------------ */
[data-js="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

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

/* 18. 响应式 -------------------------------------------------------------- */
@media (max-width: 1079px) {
  .site-header {
    position: sticky;
    top: 0;
    left: auto;
    width: 100%;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    background: #0A0E14;
  }

  .site-header::after {
    top: auto;
    right: 0;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(31, 224, 216, .6), transparent);
  }

  .header-rail {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    height: auto;
    padding: 10px 16px;
    overflow: visible;
  }

  .site-header .brand__line,
  .site-header .brand__tagline { display: none; }

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

  .side-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 80;
    width: min(84vw, 320px);
    padding: 24px 18px 26px;
    background: linear-gradient(180deg, #101825, #0A0E14);
    border-right: 1px solid var(--line);
    box-shadow: 24px 0 60px -30px #000;
    transform: translateX(-102%);
    transition: transform .32s var(--ease);
    overflow-y: auto;
  }

  .side-nav[data-open] { transform: translateX(0); }

  .side-nav .nav-link {
    padding-top: 13px;
    padding-bottom: 13px;
    font-size: 16px;
  }
}

@media (max-width: 960px) {
  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
  }

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

  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--split { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .container { padding-left: 16px; padding-right: 16px; }

  .section { padding: 46px 0; }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 30px;
    padding-top: 40px;
  }

  .footer-cols { gap: 24px; }

  .footer-bottom {
    justify-content: flex-start;
    padding-bottom: 26px;
  }

  .grid--2,
  .grid--3 { grid-template-columns: 1fr; }

  .prose { font-size: 16px; }
}

@media (min-width: 1080px) {
  body { padding-left: var(--rail-w); }

  #main-content { scroll-margin-top: 24px; }

  html { scroll-padding-top: 24px; }
}

/* 19. 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;
  }

  [data-js="on"] [data-reveal] {
    opacity: 1;
    transform: none;
  }
}