/* ==========================================================================
   星空体育CN — /assets/site.css
   共享外壳：reset、变量、中文排版、轨道导航、页脚、通用组件
   ========================================================================== */

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

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

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

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

h1, h2, h3, h4, h5 {
  font-weight: 700;
  line-height: 1.2;
}

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;
}

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

:root {
  /* 色彩 */
  --ink-900: #060912;
  --ink-800: #0B1730;
  --ink-700: #241A4A;
  --ink-600: #1A2B55;
  --moon: #F5F8FF;
  --haze: #A9B6D0;
  --cyan: #3DF2D2;
  --amber: #FF8A3D;
  --gold: #F6B94A;
  --teal-deep: #123B3A;
  --coral: #FF6B7A;

  /* 形状 */
  --r-xl: 36px;
  --r-lg: 32px;
  --r-md: 22px;
  --r-sm: 14px;
  --rail-w: 96px;

  /* 字体 */
  --font-display: "MiSans VF", "HarmonyOS Sans SC", system-ui, -apple-system, "Microsoft YaHei", sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;

  /* 动效 */
  --ease: cubic-bezier(.22, .8, .28, 1);
  --dur: .32s;

  /* 线 */
  --line-soft: rgba(169, 182, 208, .16);
  --line-strong: rgba(61, 242, 210, .34);
}

html {
  background: var(--ink-900);
}

body {
  min-height: 100vh;
  color: var(--moon);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 78% at 88% -12%, rgba(36, 26, 74, .92) 0%, rgba(36, 26, 74, 0) 58%),
    radial-gradient(90% 62% at 4% 108%, rgba(26, 43, 85, .78) 0%, rgba(26, 43, 85, 0) 66%),
    radial-gradient(60% 40% at 62% 46%, rgba(11, 23, 48, .9) 0%, rgba(6, 9, 18, 0) 70%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

body.is-locked {
  overflow: hidden;
}

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

::selection {
  background: rgba(61, 242, 210, .28);
  color: var(--moon);
}

/* --------------------------------------------------------------------------
   基础排版工具
   -------------------------------------------------------------------------- */

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

.wrap {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 22px;
}

.section {
  padding-block: clamp(48px, 7vw, 96px);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.section-label::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--cyan);
  opacity: .7;
}

.section-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.7rem, 3vw, 2.9rem);
  line-height: 1.28;
  letter-spacing: .01em;
}

.section-lede {
  max-width: 64ch;
  margin-top: 16px;
  color: var(--haze);
  font-size: 1rem;
}

.num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* --------------------------------------------------------------------------
   Skip link
   -------------------------------------------------------------------------- */

.skip-link {
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 300;
  padding: 12px 22px;
  border-radius: 999px;
  background: var(--cyan);
  color: #04121A;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  transform: translateY(-180%);
  transition: transform var(--dur) var(--ease);
}

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

/* --------------------------------------------------------------------------
   按钮
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  padding: 12px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.2;
  cursor: pointer;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.btn:hover {
  transform: translateY(-3px);
}

.btn--primary {
  background: var(--amber);
  color: #180A00;
  box-shadow: 0 14px 34px rgba(255, 138, 61, .22);
}

.btn--primary:hover {
  background: #FFA05F;
  box-shadow: 0 18px 42px rgba(255, 138, 61, .3);
}

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--cyan);
  background: rgba(61, 242, 210, .05);
}

.btn--ghost:hover {
  background: rgba(61, 242, 210, .13);
  border-color: var(--cyan);
}

.btn--quiet {
  border-color: rgba(169, 182, 208, .28);
  color: var(--haze);
}

.btn--quiet:hover {
  color: var(--moon);
  border-color: rgba(169, 182, 208, .55);
}

/* --------------------------------------------------------------------------
   标签 / 说明牌 / 面包屑
   -------------------------------------------------------------------------- */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid rgba(169, 182, 208, .28);
  background: rgba(11, 23, 48, .6);
  color: var(--haze);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  line-height: 1.4;
}

.tag--cyan {
  border-color: var(--line-strong);
  color: var(--cyan);
  background: rgba(61, 242, 210, .08);
}

.tag--gold {
  border-color: rgba(246, 185, 74, .45);
  color: var(--gold);
  background: rgba(246, 185, 74, .08);
}

.tag--amber {
  border-color: rgba(255, 138, 61, .45);
  color: var(--amber);
  background: rgba(255, 138, 61, .08);
}

.plate {
  position: relative;
  padding: 14px 18px;
  border-radius: var(--r-md);
  border: 1px solid rgba(246, 185, 74, .28);
  background: linear-gradient(150deg, rgba(18, 59, 58, .34), rgba(11, 23, 48, .5));
  color: var(--haze);
  font-size: 13px;
  line-height: 1.65;
}

.plate-strong {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--gold);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--haze);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

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

.breadcrumb li + li::before {
  content: "/";
  color: rgba(169, 182, 208, .45);
}

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

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

/* --------------------------------------------------------------------------
   图片容器基础规则（页面阶段放置占位图）
   -------------------------------------------------------------------------- */

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 100% at 84% 0%, rgba(36, 26, 74, .9), rgba(11, 23, 48, 0) 62%),
    linear-gradient(160deg, var(--ink-600), var(--ink-800) 55%, #0A1226);
  isolation: isolate;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(169, 182, 208, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(169, 182, 208, .07) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .5;
}

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

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* --------------------------------------------------------------------------
   骨架与卡片
   -------------------------------------------------------------------------- */

.split {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
  grid-template-columns: 1fr;
}

.split--57 > :first-child { min-width: 0; }

.grid-12 {
  display: grid;
  gap: clamp(18px, 2.4vw, 30px);
  grid-template-columns: 1fr;
}

.card {
  position: relative;
  padding: clamp(20px, 2.6vw, 32px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  background: linear-gradient(160deg, rgba(26, 43, 85, .62), rgba(11, 23, 48, .78));
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--line-strong);
  box-shadow: 0 22px 48px rgba(0, 0, 0, .38);
}

/* --------------------------------------------------------------------------
   入场显现
   -------------------------------------------------------------------------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .62s var(--ease), transform .62s var(--ease);
}

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

/* ==========================================================================
   头部外壳
   ========================================================================== */

.site-rail {
  --scroll-progress: 0;
  position: sticky;
  top: 0;
  z-index: 80;
  width: 100%;
  background: linear-gradient(180deg, rgba(6, 9, 18, .96), rgba(11, 23, 48, .92));
  border-bottom: 1px solid var(--line-soft);
  backdrop-filter: blur(10px);
}

/* --- 移动品牌条 --- */

.mobile-bar {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
  padding: 10px 18px;
}

.mobile-bar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(61, 242, 210, .25));
  transform: scaleX(var(--scroll-progress));
  transform-origin: left center;
  transition: transform .12s linear;
}

.mobile-bar-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-orbit {
  position: relative;
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid rgba(61, 242, 210, .5);
}

.brand-orbit::before {
  content: "";
  position: absolute;
  inset: 7px;
  border-radius: 50%;
  border: 1px solid rgba(246, 185, 74, .55);
}

.brand-orbit::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 5px;
  height: 5px;
  margin: -2.5px 0 0 -2.5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
}

.mobile-bar-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.25;
}

.mobile-bar-text strong {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .08em;
  color: var(--moon);
}

.mobile-bar-text em {
  font-style: normal;
  font-size: 10px;
  letter-spacing: .24em;
  color: var(--cyan);
}

/* --- 抽屉按钮 --- */

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--cyan);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover {
  background: rgba(61, 242, 210, .1);
}

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bars i {
  display: block;
  height: 1.5px;
  width: 100%;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.site-rail[data-open="true"] .nav-toggle-bars i:first-child {
  transform: translateY(2.75px) rotate(45deg);
}

.site-rail[data-open="true"] .nav-toggle-bars i:last-child {
  transform: translateY(-2.75px) rotate(-45deg);
}

.nav-toggle-label {
  white-space: nowrap;
}

/* --- 轨道主体（移动端 = 抽屉） --- */

.rail-spine {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 18px;
  width: min(84vw, 340px);
  padding: 78px 24px 30px;
  overflow-y: auto;
  background:
    radial-gradient(120% 60% at 100% 0%, rgba(36, 26, 74, .9), rgba(6, 9, 18, 0) 60%),
    linear-gradient(180deg, #0B1730, #060912 68%);
  border-left: 1px solid var(--line-strong);
  box-shadow: -34px 0 70px rgba(0, 0, 0, .55);
  transform: translateX(103%);
  visibility: hidden;
  transition: transform .42s var(--ease), visibility 0s .42s;
}

.site-rail[data-open="true"] .rail-spine {
  transform: translateX(0);
  visibility: visible;
  transition: transform .42s var(--ease), visibility 0s 0s;
}

.rail-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.rail-mark {
  position: relative;
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid rgba(61, 242, 210, .45);
}

.rail-mark::before {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 50%;
  border: 1px solid rgba(246, 185, 74, .5);
}

.rail-mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 6px;
  height: 6px;
  margin: -3px 0 0 -3px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  animation: rail-pulse 3.6s var(--ease) infinite;
}

@keyframes rail-pulse {
  0%, 100% { opacity: .55; transform: scale(.85); }
  50% { opacity: 1; transform: scale(1.15); }
}

.rail-wordmark {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .16em;
  color: var(--moon);
}

.rail-nav {
  display: block;
}

.rail-nav-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rail-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 13px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--haze);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .1em;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.rail-link:hover {
  color: var(--moon);
  background: rgba(61, 242, 210, .08);
}

.rail-link-text {
  display: inline-block;
}

.rail-link-dot {
  display: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
}

.rail-link[aria-current="page"] {
  background: var(--cyan);
  color: #04121A;
  border-color: var(--cyan);
}

.rail-link[aria-current="page"] .rail-link-dot {
  display: none;
}

.rail-link[aria-current="page"]:hover {
  background: var(--cyan);
  color: #04121A;
}

.rail-utils {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 6px;
  border-top: 1px solid var(--line-soft);
}

.rail-util {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid rgba(169, 182, 208, .26);
  color: var(--haze);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .12em;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.rail-util:hover {
  color: var(--gold);
  border-color: rgba(246, 185, 74, .5);
  background: rgba(246, 185, 74, .08);
}

.rail-util-glyph {
  font-size: 14px;
  line-height: 1;
}

.rail-util-label {
  white-space: nowrap;
}

.rail-progress {
  display: none;
}

/* ==========================================================================
   遮罩与收藏夹面板
   ========================================================================== */

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 65;
  background: rgba(4, 7, 16, .74);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease), visibility 0s var(--dur);
}

.nav-scrim[data-open="true"] {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--dur) var(--ease), visibility 0s 0s;
}

.collection-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 120;
  width: min(92vw, 400px);
  padding: 28px 24px 36px;
  overflow-y: auto;
  background:
    radial-gradient(110% 50% at 100% 0%, rgba(36, 26, 74, .88), rgba(6, 9, 18, 0) 62%),
    linear-gradient(180deg, #0B1730, #060912 72%);
  border-left: 1px solid rgba(246, 185, 74, .3);
  box-shadow: -40px 0 90px rgba(0, 0, 0, .6);
  transform: translateX(103%);
  visibility: hidden;
  transition: transform .4s var(--ease), visibility 0s .4s;
}

.collection-panel[data-open="true"] {
  transform: translateX(0);
  visibility: visible;
  transition: transform .4s var(--ease), visibility 0s 0s;
}

.collection-head {
  position: relative;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-soft);
}

.collection-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--gold);
}

.collection-title {
  margin-top: 6px;
  font-family: var(--font-serif);
  font-size: 1.7rem;
  font-weight: 600;
  color: var(--moon);
}

.collection-close {
  position: absolute;
  top: -4px;
  right: 0;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(169, 182, 208, .3);
  color: var(--haze);
  font-size: 20px;
  line-height: 1;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.collection-close:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.collection-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

.collection-item {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 6px 12px;
  padding: 14px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: rgba(26, 43, 85, .42);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.collection-item:hover {
  border-color: var(--line-strong);
}

.collection-item.is-starred {
  border-color: rgba(246, 185, 74, .5);
  background: rgba(18, 59, 58, .5);
}

.collection-link {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--moon);
}

.collection-link:hover {
  color: var(--cyan);
}

.collection-meta {
  grid-column: 1 / 2;
  font-size: 12px;
  color: var(--haze);
  letter-spacing: .04em;
}

.star-btn {
  grid-row: 1 / 3;
  grid-column: 2 / 3;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(169, 182, 208, .3);
  color: rgba(169, 182, 208, .55);
  font-size: 16px;
  line-height: 1;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.star-btn:hover {
  transform: scale(1.08);
  color: var(--gold);
  border-color: rgba(246, 185, 74, .55);
}

.star-btn[aria-pressed="true"] {
  color: #1B1200;
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: 0 0 18px rgba(246, 185, 74, .4);
}

.collection-note {
  margin-top: 22px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--haze);
  letter-spacing: .03em;
}

/* ==========================================================================
   页脚
   ========================================================================== */

.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 110px);
  padding-block: clamp(48px, 6vw, 84px) 30px;
  border-top: 1px solid var(--line-soft);
  background:
    radial-gradient(100% 70% at 12% 0%, rgba(36, 26, 74, .72), rgba(6, 9, 18, 0) 62%),
    linear-gradient(180deg, #0A1226, #060912 62%);
  overflow: hidden;
}

.footer-aura {
  position: absolute;
  top: -140px;
  right: -80px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  border: 1px solid rgba(61, 242, 210, .14);
  pointer-events: none;
}

.footer-aura::before {
  content: "";
  position: absolute;
  inset: 56px;
  border-radius: 50%;
  border: 1px solid rgba(246, 185, 74, .14);
}

.footer-aura::after {
  content: "";
  position: absolute;
  top: 14px;
  left: 50%;
  width: 7px;
  height: 7px;
  margin-left: -3.5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 16px var(--cyan);
}

.footer-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 22px;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 26px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line-soft);
}

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

.footer-brand {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.4vw, 3rem);
  font-weight: 900;
  letter-spacing: .02em;
  line-height: 1.1;
  color: var(--moon);
}

.footer-brand span {
  color: var(--cyan);
}

.footer-tagline {
  margin-top: 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .26em;
  color: var(--haze);
}

.footer-note {
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--haze);
}

.footer-grid {
  display: grid;
  gap: 32px;
  grid-template-columns: 1fr;
  padding-block: 36px;
}

.footer-col-title {
  margin-bottom: 16px;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--moon);
}

.footer-col-title::after {
  content: "";
  display: block;
  width: 24px;
  height: 1px;
  margin-top: 10px;
  background: var(--cyan);
  opacity: .7;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  display: inline-block;
  font-size: 14px;
  letter-spacing: .05em;
  color: var(--haze);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer-links a:hover {
  color: var(--cyan);
  transform: translateX(4px);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-contact li {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 10px;
  align-items: baseline;
}

.footer-contact-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(169, 182, 208, .7);
}

.footer-contact-value {
  font-size: 14px;
  line-height: 1.6;
  color: var(--moon);
  overflow-wrap: anywhere;
}

.footer-col--contact .footer-contact-value {
  font-family: var(--font-body);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 24px;
  border-top: 1px solid var(--line-soft);
}

.footer-legal {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: rgba(169, 182, 208, .78);
}

.footer-legal a {
  color: var(--haze);
  transition: color var(--dur) var(--ease);
}

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

.footer-legal--links {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
}

.footer-legal--icp {
  color: rgba(169, 182, 208, .6);
}

/* ==========================================================================
   响应式
   ========================================================================== */

@media (min-width: 600px) {
  body { font-size: 17.5px; }

  .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 768px) {
  .wrap { padding-inline: 34px; }
  .footer-inner { padding-inline: 34px; }

  .footer-grid { grid-template-columns: 1fr 1fr 1.35fr; }

  .split--57 { grid-template-columns: 5fr 7fr; }
  .split--66 { grid-template-columns: 6fr 6fr; }
}

@media (min-width: 1024px) {
  body {
    padding-left: var(--rail-w);
  }

  .site-rail {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--rail-w);
    height: 100vh;
    border-bottom: 0;
    border-right: 1px solid var(--line-soft);
    background:
      radial-gradient(120% 46% at 50% 0%, rgba(36, 26, 74, .85), rgba(6, 9, 18, 0) 62%),
      linear-gradient(180deg, #0A1226, #060912 58%);
    backdrop-filter: none;
  }

  .mobile-bar { display: none; }

  .rail-spine {
    position: static;
    width: 100%;
    height: 100%;
    padding: 22px 0 18px;
    align-items: center;
    gap: 20px;
    overflow: visible;
    background: none;
    border-left: 0;
    box-shadow: none;
    transform: none;
    visibility: visible;
    transition: none;
  }

  .rail-brand {
    flex-direction: column;
    gap: 12px;
  }

  .rail-wordmark {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 13px;
    letter-spacing: .3em;
  }

  .rail-nav {
    flex: 1 1 auto;
    min-height: 0;
    width: 100%;
    overflow-y: auto;
    scrollbar-width: none;
  }

  .rail-nav::-webkit-scrollbar { display: none; }

  .rail-nav-list {
    align-items: center;
    gap: 2px;
  }

  .rail-link {
    justify-content: center;
    width: auto;
    padding: 10px 9px;
    border-radius: 999px;
  }

  .rail-link:hover .rail-link-dot,
  .rail-link:focus-visible .rail-link-dot {
    display: block;
  }

  .rail-link-text {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 12.5px;
    letter-spacing: .26em;
    line-height: 1;
  }

  .rail-utils {
    flex: none;
    flex-direction: column;
    align-items: center;
    gap: 9px;
    padding-top: 14px;
    border-top: 1px solid var(--line-soft);
  }

  .rail-util {
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
  }

  .rail-util-label {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .rail-util::after {
    content: attr(data-tip);
    position: absolute;
    left: calc(100% + 14px);
    top: 50%;
    transform: translateY(-50%) translateX(-6px);
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--ink-600);
    border: 1px solid var(--line-strong);
    color: var(--moon);
    font-size: 11px;
    letter-spacing: .1em;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity .22s var(--ease), transform .22s var(--ease);
    z-index: 5;
  }

  .rail-util:hover::after,
  .rail-util:focus-visible::after {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
  }

  .rail-progress {
    display: block;
    position: relative;
    flex: none;
    width: 2px;
    height: 56px;
    margin-bottom: 4px;
    border-radius: 2px;
    background: rgba(169, 182, 208, .18);
    overflow: hidden;
  }

  .rail-progress-fill {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, var(--cyan), rgba(61, 242, 210, .18));
    transform: scaleY(var(--scroll-progress));
    transform-origin: top center;
    transition: transform .12s linear;
  }

  .nav-scrim { display: none; }

  .collection-panel { width: 400px; }
}

@media (min-width: 1280px) {
  .wrap { padding-inline: 44px; }
}

/* ==========================================================================
   可访问性 / 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;
    transition-delay: 0s !important;
  }

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

  .rail-brand .rail-mark::after { animation: none; opacity: 1; transform: none; }
}