/* ==========================================================================
   BET9登录口 · /assets/site.css
   坐标仪表盘系统：框架式页头 / 切角面板 / 深海蓝分区 / 少量信号色
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 132px;
}

body, h1, h2, h3, h4, h5, p, ul, ol, dl, dd, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --c-abyss: #04121F;
  --c-navy: #072A45;
  --c-navy-2: #0B3B5E;
  --c-navy-3: #124A72;
  --c-cyan: #16D9E3;
  --c-coral: #FF6B4A;
  --c-sand: #E8C37A;
  --c-mist: #A9B7C6;
  --c-paper: #F2F7FA;
  --c-pine: #2BB3A3;
  --c-amber: #F2A65A;

  --edge: rgba(22, 217, 227, .24);
  --edge-strong: rgba(22, 217, 227, .48);
  --line: rgba(169, 183, 198, .20);
  --line-soft: rgba(169, 183, 198, .11);

  --font-head: "HarmonyOS Sans SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Sans SC", "PingFang SC", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", Consolas, "Courier New", monospace;

  --container: 1240px;
  --gutter: clamp(18px, 4vw, 52px);
  --radius: 2px;
  --cut: 14px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --shadow-panel: 0 20px 44px -28px rgba(4, 18, 31, .95);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  letter-spacing: .01em;
  color: var(--c-paper);
  background-color: var(--c-navy);
  background-image:
    repeating-linear-gradient(90deg, rgba(169, 183, 198, .045) 0 1px, transparent 1px 92px),
    radial-gradient(1100px 520px at 8% -10%, rgba(22, 217, 227, .10), transparent 62%),
    radial-gradient(900px 520px at 100% 0%, rgba(255, 107, 74, .07), transparent 58%);
  background-repeat: repeat, no-repeat, no-repeat;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--c-paper);
}

h1 { font-size: clamp(2.25rem, 4.2vw, 3.5rem); line-height: 1.14; }
h2 { font-size: clamp(1.6rem, 2.6vw, 2.25rem); }
h3 { font-size: clamp(1.15rem, 1.7vw, 1.5rem); }
h4 { font-size: 1.05rem; font-weight: 600; }

p { text-wrap: pretty; }
strong, b { font-weight: 700; color: var(--c-paper); }

::selection {
  background: var(--c-cyan);
  color: var(--c-abyss);
}

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

/* ---------- 4. 无障碍工具类 ---------- */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 0; left: 0;
  z-index: 200;
  padding: .72em 1.3em;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: .9rem;
  color: #23100A;
  background: var(--c-coral);
  border-radius: 0 0 var(--radius) 0;
  transform: translateY(-130%);
  transition: transform .2s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 3px solid var(--c-paper);
  outline-offset: 2px;
}

/* ---------- 5. 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(40px, 6vw, 80px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 22px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--c-cyan);
}
.eyebrow::before {
  content: "";
  width: 18px; height: 1px;
  background: var(--c-cyan);
}

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); grid-template-columns: 1fr; }
.grid--2, .grid--3, .grid--4 { display: grid; gap: clamp(16px, 2.4vw, 28px); grid-template-columns: 1fr; }

@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.stack { display: grid; gap: clamp(12px, 1.6vw, 20px); }
.stack--tight { gap: 8px; }
.stack--loose { gap: clamp(20px, 3vw, 34px); }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}

.divider {
  height: 1px;
  border: 0;
  margin-block: clamp(24px, 4vw, 42px);
  background: linear-gradient(90deg, var(--c-cyan), rgba(22, 217, 227, .05) 70%, transparent);
  opacity: .5;
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  padding: .72em 1.4em;
  font-family: var(--font-head);
  font-size: .94rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: .02em;
  border-radius: var(--radius);
  transition: background-color .18s var(--ease), color .18s var(--ease),
              transform .18s var(--ease), box-shadow .18s var(--ease);
}

.btn--primary {
  color: #22100A;
  background: var(--c-coral);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  box-shadow: 0 10px 24px -16px rgba(255, 107, 74, .9);
}
.btn--primary:hover { background: #FF8365; transform: translateY(-1px); }
.btn--primary:active { transform: translateY(0); }
.btn--primary:focus-visible { outline-offset: 3px; }

.btn--ghost {
  color: var(--c-cyan);
  border: 1px solid var(--edge-strong);
  background: rgba(22, 217, 227, .06);
}
.btn--ghost:hover {
  color: var(--c-abyss);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

/* ---------- 7. 标签 / 卡片 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 9px;
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .1em;
  line-height: 1.7;
  border: 1px solid currentColor;
  border-radius: var(--radius);
  white-space: nowrap;
}
.tag--version { color: var(--c-sand); }
.tag--active { color: var(--c-pine); }
.tag--warn { color: var(--c-amber); }

.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background:
    linear-gradient(158deg, rgba(18, 74, 114, .55), rgba(11, 59, 94, .92) 46%, rgba(7, 42, 69, .96));
  border: 1px solid var(--line);
  border-left: 1px solid var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}
.card:hover { border-color: var(--edge-strong); transform: translateY(-2px); }
.card > h3 + p,
.card > h3 + .stack { margin-top: 10px; }

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  padding-block: 14px;
  border-bottom: 1px solid var(--line-soft);
}
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--c-mist);
}
.breadcrumb-list li { display: inline-flex; align-items: center; }
.breadcrumb-list li + li::before {
  content: "/";
  margin-inline: 10px;
  color: rgba(169, 183, 198, .42);
}
.breadcrumb-link { color: var(--c-mist); transition: color .18s var(--ease); }
.breadcrumb-link:hover { color: var(--c-cyan); }
.breadcrumb-current { color: var(--c-sand); }

/* ---------- 9. 正文长文 ---------- */
.prose {
  max-width: 72ch;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(242, 247, 250, .92);
  text-wrap: pretty;
}
.prose > * + * { margin-top: 1.1em; }
.prose h2 { margin-top: 2em; font-size: clamp(1.4rem, 2.2vw, 1.85rem); }
.prose h3 { margin-top: 1.6em; }
.prose strong { color: var(--c-paper); }
.prose a {
  color: var(--c-cyan);
  border-bottom: 1px solid rgba(22, 217, 227, .42);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.prose a:hover { color: var(--c-paper); border-bottom-color: var(--c-paper); }
.prose ul, .prose ol { display: grid; gap: .5em; margin-top: 1em; }
.prose li { position: relative; padding-left: 1.25em; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0; top: .78em;
  width: 6px; height: 6px;
  background: var(--c-cyan);
  transform: rotate(45deg);
}
.prose ol { counter-reset: prose-ol; }
.prose ol li { padding-left: 1.7em; }
.prose ol li::before {
  counter-increment: prose-ol;
  content: counter(prose-ol, decimal-leading-zero);
  position: absolute;
  left: 0; top: .15em;
  font-family: var(--font-mono);
  font-size: .78em;
  font-weight: 600;
  color: var(--c-sand);
}

/* ---------- 10. 图片容器基础规则 ---------- */
.media {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background:
    linear-gradient(152deg, var(--c-navy-2), #06263D 68%, var(--c-abyss));
}
.media::before {
  content: "";
  position: absolute;
  inset: auto -18% -42% auto;
  width: 62%; height: 62%;
  background: repeating-linear-gradient(45deg, rgba(22, 217, 227, .16) 0 1px, transparent 1px 12px);
  transform: rotate(-8deg);
  pointer-events: none;
}
.media::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(22, 217, 227, .18);
  clip-path: polygon(0 0, 22% 0, 22% 1px, 1px 1px, 1px 22%, 0 22%,
                     0 100%, 78% 100%, 78% calc(100% - 1px), calc(100% - 1px) calc(100% - 1px),
                     calc(100% - 1px) 78%, 100% 78%, 100% 100%);
  pointer-events: none;
}
.media > img,
.media > picture,
.media > video,
.media > svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 1;
}
.media--wide { aspect-ratio: 16 / 9; }
.media--panel { aspect-ratio: 4 / 3; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .05em;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 11. 页头：框架式导航 ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  z-index: 140;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-sand) 58%, var(--c-coral));
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, #062338 0%, var(--c-navy) 58%, #06243B 100%);
  border-bottom: 1px solid rgba(22, 217, 227, .18);
  transition: box-shadow .3s var(--ease);
}
.site-header[data-scrolled] {
  box-shadow: 0 16px 36px -22px rgba(4, 18, 31, .98);
}

.header-ruler {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 34px;
  padding-inline: var(--gutter);
  overflow: hidden;
  background:
    repeating-linear-gradient(90deg, rgba(169, 183, 198, .34) 0 1px, transparent 1px 26px) left bottom / 100% 7px no-repeat,
    linear-gradient(90deg, var(--c-abyss), var(--c-navy) 42%, var(--c-navy-2));
  border-bottom: 1px solid rgba(22, 217, 227, .16);
  transition: height .3s var(--ease), opacity .26s var(--ease);
}
.site-header[data-scrolled] .header-ruler {
  height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.ruler-ticks {
  flex: 0 1 220px;
  height: 10px;
  background: repeating-linear-gradient(90deg, rgba(22, 217, 227, .62) 0 1px, transparent 1px 13px);
  opacity: .55;
  -webkit-mask-image: linear-gradient(90deg, #000, transparent);
          mask-image: linear-gradient(90deg, #000, transparent);
}

.ruler-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .14em;
  line-height: 1;
  color: var(--c-mist);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-dot {
  flex: 0 0 auto;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--c-pine);
  box-shadow: 0 0 0 3px rgba(43, 179, 163, .22);
}

.header-frame {
  position: relative;
  padding-inline: var(--gutter);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-block: 13px;
}

.header-rail {
  height: 3px;
  background: linear-gradient(90deg,
    var(--c-cyan) 0%, rgba(22, 217, 227, 0) 26%,
    rgba(232, 195, 122, .9) 58%, var(--c-coral) 100%);
  opacity: .8;
}

/* 品牌坐标块 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  padding-right: 18px;
  border-right: 1px solid var(--line);
}
.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 40px; height: 40px;
  background: linear-gradient(142deg, var(--c-navy-3), var(--c-navy-2));
  border: 1px solid var(--edge-strong);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}
.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  background: var(--c-cyan);
}
.brand-mark::before {
  width: 18px; height: 1px;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}
.brand-mark::after {
  width: 1px; height: 18px;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}
.brand-mark-dot {
  position: absolute;
  top: 7px; right: 7px;
  width: 6px; height: 6px;
  background: var(--c-coral);
  border-radius: 50%;
}
.brand-text { display: block; }
.brand-name {
  display: block;
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.25;
  color: var(--c-paper);
}
.brand-tagline {
  display: block;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  line-height: 1.6;
  color: var(--c-mist);
}

/* 移动端按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 13px;
  border: 1px solid var(--edge-strong);
  border-radius: var(--radius);
  color: var(--c-cyan);
  background: rgba(22, 217, 227, .07);
  transition: background-color .18s var(--ease), color .18s var(--ease);
}
.nav-toggle:hover { background: rgba(22, 217, 227, .16); }
.nav-toggle:focus-visible { outline-offset: 2px; }

.nav-toggle-box { display: grid; gap: 4px; width: 18px; }
.nav-toggle-box > span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform .26s var(--ease), opacity .18s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-box > span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-box > span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-box > span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.nav-toggle-text {
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .16em;
}

/* 导航 */
.site-nav {
  display: none;
  position: absolute;
  top: calc(100% + 1px);
  left: var(--gutter);
  right: var(--gutter);
  z-index: 90;
  flex-direction: column;
  align-items: stretch;
  gap: 12px;
  padding: 14px;
  background: linear-gradient(180deg, var(--c-navy-2), var(--c-navy) 78%);
  border: 1px solid var(--edge-strong);
  border-top: 2px solid var(--c-cyan);
  box-shadow: 0 26px 52px -26px rgba(4, 18, 31, .98);
}
.site-nav[data-open] {
  display: flex;
  animation: navIn .26s var(--ease) both;
}
@keyframes navIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
}
.nav-item { display: flex; }
.nav-link {
  position: relative;
  display: block;
  flex: 1;
  padding: 11px 14px;
  font-family: var(--font-head);
  font-size: .95rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--c-mist);
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 5px;
  height: 2px;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .26s var(--ease);
}
.nav-link:hover {
  color: var(--c-paper);
  background: rgba(22, 217, 227, .08);
  border-color: rgba(22, 217, 227, .22);
}
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] {
  color: var(--c-paper);
  background: rgba(232, 195, 122, .10);
  border-color: rgba(232, 195, 122, .48);
}
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--c-sand);
}

.nav-cta { width: 100%; }

/* 桌面端：导航成为横向框架条 */
@media (min-width: 1024px) {
  .nav-toggle { display: none; }

  .site-nav {
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    gap: clamp(8px, 1.4vw, 22px);
    margin-left: auto;
    padding: 0;
    background: none;
    border: 0;
    box-shadow: none;
    animation: none;
  }

  .nav-list { flex-direction: row; width: auto; gap: 4px; }

  .nav-link {
    flex: 0 0 auto;
    padding: 9px 13px;
    font-size: .92rem;
  }

  .nav-cta { width: auto; margin-top: 0; }
}

@media (max-width: 520px) {
  .ruler-ticks { display: none; }
  .ruler-status { font-size: .64rem; letter-spacing: .1em; }
  .brand { padding-right: 12px; }
  .brand-tagline { display: none; }
  .brand-name { font-size: 1rem; }
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  color: var(--c-paper);
  background: linear-gradient(180deg, var(--c-navy) 0%, #04121F 72%, #030D17 100%);
  border-top: 1px solid rgba(22, 217, 227, .22);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(90deg, rgba(169, 183, 198, .06) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, rgba(169, 183, 198, .06) 0 1px, transparent 1px 64px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 76%);
          mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 76%);
}

.footer-ruler {
  height: 2px;
  background: repeating-linear-gradient(90deg, rgba(22, 217, 227, .55) 0 2px, transparent 2px 22px);
  opacity: .5;
}

.footer-inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(38px, 5.5vw, 68px) 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
}
@media (min-width: 640px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
  .footer-grid { grid-template-columns: 1.6fr .85fr .85fr 1.45fr; }
}

.footer-brand-link {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--c-paper);
  border-bottom: 2px solid var(--c-coral);
  padding-bottom: 4px;
}
.footer-brand-link:hover { color: var(--c-cyan); }

.footer-summary {
  margin-top: 14px;
  max-width: 30ch;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.footer-coords {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 20px;
}
.footer-coord {
  width: 9px; height: 9px;
  border: 1px solid rgba(22, 217, 227, .55);
  transform: rotate(45deg);
}
.footer-coord:nth-child(4n) {
  border-color: rgba(232, 195, 122, .7);
  background: rgba(232, 195, 122, .18);
}

.footer-heading {
  padding-bottom: 10px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .18em;
  line-height: 1.6;
  color: var(--c-cyan);
  border-bottom: 1px solid var(--line);
}

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

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: .92rem;
  line-height: 1.7;
  color: var(--c-mist);
  transition: color .18s var(--ease), transform .18s var(--ease);
}
.footer-link::before {
  content: "";
  flex: 0 0 auto;
  width: 6px; height: 6px;
  border: 1px solid currentColor;
  transform: rotate(45deg);
  opacity: .65;
  transition: opacity .18s var(--ease), background-color .18s var(--ease);
}
.footer-link:hover { color: var(--c-cyan); transform: translateX(3px); }
.footer-link:hover::before { opacity: 1; background: currentColor; }

.contact-list { display: grid; gap: 12px; }
.contact-item { display: grid; gap: 2px; }
.contact-label {
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--c-sand);
}
.contact-value {
  font-size: .9rem;
  line-height: 1.7;
  color: var(--c-paper);
  overflow-wrap: anywhere;
}

.footer-note {
  margin-top: 16px;
  padding: 12px 14px;
  font-size: .78rem;
  line-height: 1.8;
  color: var(--c-mist);
  background: rgba(242, 166, 90, .08);
  border-left: 2px solid var(--c-amber);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 26px;
  margin-top: clamp(30px, 4.5vw, 52px);
  padding-block: 20px 26px;
  border-top: 1px solid var(--line);
}

.footer-copy {
  font-size: .78rem;
  line-height: 1.7;
  color: rgba(169, 183, 198, .82);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}
.footer-legal-link {
  font-size: .82rem;
  color: var(--c-mist);
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.footer-legal-link:hover { color: var(--c-cyan); border-bottom-color: var(--c-cyan); }

.footer-icp {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--c-mist);
}

/* ---------- 13. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .card:hover, .footer-link:hover, .btn:hover { transform: none; }
}