/* ===========================================================
   MELBET 品牌通道 · 共享 Site Kit   /assets/site.css
   夜间导航控制台：深墨蓝基底 / 电光青通道 / 琥珀金批次
   =========================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background-color: #06111F;
  background-image:
    radial-gradient(900px 620px at 78% -12%, rgba(25, 216, 244, 0.10), transparent 70%),
    radial-gradient(720px 520px at 4% 106%, rgba(243, 181, 68, 0.07), transparent 70%),
    repeating-linear-gradient(0deg, rgba(169, 216, 230, 0.045) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(90deg, rgba(169, 216, 230, 0.045) 0 1px, transparent 1px 88px);
  background-attachment: fixed;
}

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

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

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

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

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

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

hr { border: 0; }

/* ---------- 2. tokens ---------- */
:root {
  --ink: #06111F;
  --panel: #0B2239;
  --line: #173A56;
  --cyan: #19D8F4;
  --amber: #F3B544;
  --ice: #EAF6FF;
  --graphite: #8CA0B3;
  --green: #34E0A1;
  --red: #FF6B6B;
  --mist: #A9D8E6;

  --rail-w: 96px;
  --wrap: 1280px;
  --gutter: clamp(18px, 4vw, 56px);
  --radius: 2px;
  --edge: 1px solid var(--line);

  --font-display: "HarmonyOS Sans SC", "PingFang SC", "Noto Sans SC", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "PingFang SC", "Noto Sans SC", "HarmonyOS Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

/* ---------- 3. 中文排版基线 ---------- */
body {
  font-family: var(--font-body);
  font-size: clamp(16px, 0.55vw + 14.4px, 17.5px);
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--ice);
  background: transparent;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

p + p { margin-top: 0.9em; }

strong, b { font-weight: 700; color: var(--ice); }

::selection { background: rgba(25, 216, 244, 0.28); color: var(--ice); }

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

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

/* ---------- 4. 容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.shell {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(26px, 4vw, 54px) var(--gutter) clamp(56px, 8vw, 110px);
}

.grid-2 {
  display: grid;
  gap: clamp(16px, 2.4vw, 30px);
  grid-template-columns: 1fr;
}

.grid-3 {
  display: grid;
  gap: clamp(16px, 2.4vw, 30px);
  grid-template-columns: 1fr;
}

@media (min-width: 760px) {
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 760px) {
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

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

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan);
  color: #04121F;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: var(--radius);
  box-shadow: 0 16px 34px -18px rgba(25, 216, 244, 0.9);
  transform: translateY(-220%);
  transition: transform 0.22s ease;
}

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

/* ---------- 6. 左侧品牌轨道 ---------- */
.rail { display: none; }

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

  .rail {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--rail-w);
    z-index: 70;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 0 22px;
    background: linear-gradient(180deg, #0B2239 0%, #071523 62%, #06111F 100%);
    border-right: var(--edge);
    overflow: hidden;
  }

  .rail::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 40%;
    background: linear-gradient(180deg, rgba(25, 216, 244, 0) 0%, rgba(25, 216, 244, 0.16) 100%);
    clip-path: polygon(0 26%, 100% 0, 100% 100%, 0 100%);
    pointer-events: none;
  }

  .rail-mark {
    position: relative;
    z-index: 1;
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    border: 1px solid rgba(25, 216, 244, 0.5);
    border-radius: var(--radius);
    color: var(--cyan);
    box-shadow: 0 0 26px -10px rgba(25, 216, 244, 0.95);
    transition: border-color 0.25s ease, color 0.25s ease, background 0.25s ease;
  }

  .rail-mark:hover,
  .rail-mark:focus-visible {
    background: rgba(25, 216, 244, 0.12);
    border-color: var(--cyan);
    color: var(--ice);
  }

  .rail-mark-glyph {
    font-family: var(--font-mono);
    font-size: 19px;
    font-weight: 700;
    letter-spacing: 0.04em;
    line-height: 1;
  }

  .rail-word {
    position: relative;
    z-index: 1;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.42em;
    text-transform: uppercase;
    color: var(--graphite);
  }

  .rail-track {
    position: relative;
    z-index: 1;
    flex: 1 1 auto;
    width: 2px;
    margin: 4px 0;
    border-radius: 2px;
    background: rgba(25, 216, 244, 0.16);
    overflow: hidden;
  }

  .rail-progress {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 0;
    border-radius: 2px;
    background: linear-gradient(180deg, var(--cyan), var(--amber));
    box-shadow: 0 0 14px rgba(25, 216, 244, 0.8);
  }

  .rail-meta {
    position: relative;
    z-index: 1;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--graphite);
    opacity: 0.75;
  }
}

/* ---------- 7. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(8, 22, 38, 0.985) 0%, rgba(6, 17, 31, 0.96) 100%);
  border-bottom: var(--edge);
  box-shadow: 0 26px 54px -46px rgba(0, 0, 0, 0.95);
}

.progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: rgba(169, 216, 230, 0.10);
  z-index: 2;
}

.progress-fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  box-shadow: 0 0 12px rgba(25, 216, 244, 0.75);
}

.header-main { position: static; }

.header-top {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  min-height: 64px;
  padding: 11px var(--gutter);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  flex: 0 0 auto;
}

.brand-name {
  font-family: var(--font-display);
  font-size: clamp(16.5px, 1.5vw, 20px);
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ice);
  line-height: 1.2;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--cyan);
  padding-left: 10px;
  border-left: 1px solid var(--line);
  line-height: 1.4;
}

/* 版本信息 */
.util {
  display: none;
  align-items: center;
  gap: 9px;
  flex: 1 1 auto;
  justify-content: flex-end;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--graphite);
  line-height: 1.5;
}

.util-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex: 0 0 auto;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(52, 224, 161, 0.16);
  animation: util-pulse 3.4s ease-in-out infinite;
}

.util-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

@keyframes util-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(52, 224, 161, 0.16); }
  50% { box-shadow: 0 0 0 6px rgba(52, 224, 161, 0.05); }
}

@media (min-width: 1100px) {
  .util { display: flex; }
}

.header-cta { margin-left: auto; }

/* 移动菜单按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 34, 57, 0.6);
  color: var(--ice);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  transition: border-color 0.22s ease, background 0.22s ease, color 0.22s ease;
}

.nav-toggle:hover { border-color: rgba(25, 216, 244, 0.6); color: var(--cyan); }

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
}

.nav-toggle-bars span {
  display: block;
  height: 1.5px;
  width: 100%;
  background: var(--cyan);
  transition: transform 0.28s ease, opacity 0.24s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

@media (max-width: 719px) {
  .header-cta { display: none; }
  .nav-toggle { margin-left: auto; }
}

@media (min-width: 1024px) {
  .nav-toggle { display: none; }
}

/* 导航通道带 */
.nav-bar {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  min-height: 52px;
  padding: 0 var(--gutter);
  border-top: 1px solid rgba(23, 58, 86, 0.75);
  background:
    linear-gradient(180deg, rgba(11, 34, 57, 0.82), rgba(11, 34, 57, 0.30)),
    repeating-linear-gradient(115deg, rgba(169, 216, 230, 0.05) 0 1px, transparent 1px 16px);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.4vw, 20px);
  flex: 1 1 auto;
  min-width: 0;
}

.nav-item { flex: 0 0 auto; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 15px 9px 13px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--graphite);
  white-space: nowrap;
  transition: color 0.24s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 9px;
  right: 9px;
  bottom: 7px;
  height: 1.5px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s cubic-bezier(0.2, 0.7, 0.3, 1);
}

.nav-link:hover { color: var(--ice); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--ice); }
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  box-shadow: 0 0 10px rgba(25, 216, 244, 0.85);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--cyan);
  opacity: 0.55;
  transition: opacity 0.24s ease, color 0.24s ease;
}

.nav-link:hover .nav-index { opacity: 0.9; }

.nav-link[aria-current="page"] .nav-index {
  opacity: 1;
  color: var(--amber);
}

.nav-fee {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  margin-left: auto;
  padding: 9px 16px;
  border: 1px solid rgba(243, 181, 68, 0.45);
  border-radius: 999px;
  background: rgba(243, 181, 68, 0.07);
  color: var(--amber);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  white-space: nowrap;
  transition: background 0.24s ease, border-color 0.24s ease, color 0.24s ease;
}

.nav-fee:hover {
  background: rgba(243, 181, 68, 0.17);
  border-color: var(--amber);
  color: #FFD98A;
}

.nav-fee-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(243, 181, 68, 0.18);
}

/* 移动端：抽屉 */
@media (max-width: 1023px) {
  .nav-bar {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    padding: 6px var(--gutter) 20px;
    border-bottom: var(--edge);
    background: linear-gradient(180deg, #0B2239 0%, #06111F 100%);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: max-height 0.36s ease, opacity 0.26s ease, transform 0.3s ease, visibility 0.36s;
  }

  .nav-bar[data-open] {
    max-height: 80vh;
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-list { display: block; }

  .nav-item { border-bottom: 1px solid rgba(23, 58, 86, 0.7); }

  .nav-link {
    display: flex;
    width: 100%;
    padding: 15px 4px;
    font-size: 16px;
  }

  .nav-link::after { left: 4px; right: auto; width: 34px; bottom: 9px; }

  .nav-fee {
    margin: 16px 0 0;
    width: 100%;
    justify-content: center;
  }
}

/* ---------- 8. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 34, 57, 0.72);
  color: var(--ice);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.07em;
  line-height: 1.3;
  transition: transform 0.22s ease, background 0.24s ease, border-color 0.24s ease, color 0.24s ease, box-shadow 0.24s ease;
}

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

.btn-primary {
  background: linear-gradient(120deg, var(--cyan), #0FB3D8);
  color: #04121F;
  border-color: transparent;
  box-shadow: 0 14px 32px -18px rgba(25, 216, 244, 0.95);
}

.btn-primary:hover { box-shadow: 0 18px 38px -16px rgba(25, 216, 244, 0.95); }

.btn-amber {
  background: linear-gradient(120deg, var(--amber), #E09A22);
  color: #241503;
  border-color: transparent;
  box-shadow: 0 14px 32px -18px rgba(243, 181, 68, 0.9);
}

.btn-amber:hover { box-shadow: 0 18px 38px -16px rgba(243, 181, 68, 0.9); }

.btn-ghost {
  background: transparent;
  border-color: rgba(25, 216, 244, 0.45);
  color: var(--cyan);
}

.btn-ghost:hover {
  background: rgba(25, 216, 244, 0.1);
  border-color: var(--cyan);
}

.btn-sm { padding: 9px 16px; font-size: 13px; letter-spacing: 0.06em; }

/* ---------- 9. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 4px 0 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

.crumb {
  color: var(--graphite);
  transition: color 0.2s ease;
}

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

.crumb-sep { color: var(--line); }

.crumb-current { color: var(--ice); }

/* ---------- 10. 版式组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--cyan);
  line-height: 1.6;
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--cyan);
  flex: 0 0 auto;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 2.6vw, 2.2rem);
  line-height: 1.22;
  letter-spacing: 0.02em;
  color: var(--ice);
}

.lead {
  font-size: clamp(1rem, 1.1vw, 1.1rem);
  line-height: 1.85;
  color: var(--mist);
  max-width: 62ch;
}

.divider {
  height: 1px;
  margin: clamp(24px, 4vw, 44px) 0;
  background: linear-gradient(90deg, var(--line), rgba(23, 58, 86, 0));
}

/* ---------- 11. 面板 / 数据卡 / chips ---------- */
.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px);
  border: var(--edge);
  border-radius: var(--radius);
  background: linear-gradient(165deg, rgba(11, 34, 57, 0.94) 0%, rgba(11, 34, 57, 0.60) 100%);
  box-shadow: 0 34px 64px -56px rgba(0, 0, 0, 1);
}

.data-card {
  position: relative;
  padding: clamp(16px, 2vw, 24px);
  border: var(--edge);
  border-left: 2px solid var(--amber);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(11, 34, 57, 0.96) 0%, rgba(6, 17, 31, 0.78) 100%);
  box-shadow: 0 26px 52px -48px rgba(0, 0, 0, 1);
  overflow: hidden;
}

.data-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(25, 216, 244, 0.10) 0%, transparent 46%);
  pointer-events: none;
}

.data-num {
  position: relative;
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.25rem, 4.4vw, 3.4rem);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--amber);
}

.data-label {
  position: relative;
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(11, 34, 57, 0.6);
  color: var(--graphite);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.chip:hover {
  color: var(--ice);
  border-color: rgba(25, 216, 244, 0.5);
}

.chip[aria-pressed="true"],
.chip.is-active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04121F;
}

/* ---------- 12. 图片容器基础规则 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border: var(--edge);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 120% at 18% 8%, rgba(25, 216, 244, 0.16) 0%, transparent 62%),
    linear-gradient(145deg, #0B2239 0%, #06111F 100%);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(115deg, rgba(169, 216, 230, 0.06) 0 1px, transparent 1px 15px);
  opacity: 0.75;
  pointer-events: none;
}

.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

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

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

.media-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--graphite);
}

.media-grid {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr));
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(40px, 6vw, 90px);
  border-top: var(--edge);
  background: linear-gradient(180deg, rgba(11, 34, 57, 0.88) 0%, rgba(6, 17, 31, 1) 72%);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 150px;
  background: linear-gradient(100deg, rgba(25, 216, 244, 0.16) 0%, rgba(25, 216, 244, 0) 58%);
  clip-path: polygon(0 0, 100% 0, 100% 16%, 0 100%);
  pointer-events: none;
}

.footer-wrap {
  position: relative;
  padding-top: clamp(34px, 5vw, 64px);
  padding-bottom: 22px;
}

.footer-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: 1fr;
}

@media (min-width: 760px) {
  .footer-grid { grid-template-columns: 1.1fr 1.5fr; }
}

@media (min-width: 1080px) {
  .footer-grid { grid-template-columns: 1.05fr 1.55fr 1fr; }
}

.brand-footer {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}

.brand-footer .brand-name { font-size: clamp(19px, 2vw, 24px); }

.brand-footer .brand-sub {
  border-left: 0;
  padding-left: 0;
  letter-spacing: 0.3em;
}

.footer-desc {
  max-width: 34ch;
  margin-top: 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.footer-stamp {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  margin-top: 18px;
  padding: 9px 14px;
  border: 1px solid rgba(243, 181, 68, 0.32);
  border-left: 2px solid var(--amber);
  border-radius: var(--radius);
  background: rgba(243, 181, 68, 0.07);
}

.footer-stamp-num {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.footer-stamp-txt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--graphite);
}

.footer-nav {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
}

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

.footer-title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-list { display: grid; gap: 9px; }

.footer-link {
  display: inline-block;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--graphite);
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-link:hover {
  color: var(--ice);
  transform: translateX(2px);
}

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

.footer-address {
  font-style: normal;
  display: grid;
  gap: 2px;
}

.contact-line {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  padding: 7px 0;
  border-bottom: 1px dashed rgba(23, 58, 86, 0.85);
}

.contact-key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--graphite);
}

.contact-val {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ice);
  word-break: break-word;
}

.footer-note {
  max-width: 40ch;
  margin-top: 14px;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--graphite);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 46px);
  padding-top: 18px;
  border-top: var(--edge);
}

.footer-legal {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 34, 57, 0.62);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--graphite);
  transition: color 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.to-top:hover {
  color: var(--ice);
  border-color: var(--cyan);
  background: rgba(25, 216, 244, 0.1);
}

.to-top.is-on {
  color: var(--cyan);
  border-color: rgba(25, 216, 244, 0.5);
}

.to-top-arrow { font-size: 13px; line-height: 1; }

/* ---------- 14. 显现与动效协议 ---------- */
[data-reveal] {
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.2, 0.7, 0.3, 1);
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
}

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

/* ---------- 15. 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .util-dot { animation: none; }

  .js [data-reveal],
  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .btn:hover,
  .footer-link:hover { transform: none; }
}