/* ===========================================================
   天博体育官网 · 共享样式表 /assets/site.css
   深墨绿基底 + 荧光青绿数据色 + 暖橙价格锚点
   =========================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
}

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

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

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
}

button { cursor: pointer; }

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

table { border-collapse: collapse; width: 100%; }

[hidden] { display: none !important; }

/* ---------- 2. tokens ---------- */
:root {
  --bg: #071C16;
  --coal: #0E1112;
  --panel: #123028;
  --neon: #1FE0A4;
  --neon-2: #7BF2CC;
  --amber: #FF8A3D;
  --amber-2: #FFC08A;
  --paper: #F2F7F4;
  --mist: #8FA79E;
  --line: #2B4740;

  --font-head: "Oswald", "Barlow Condensed", "Noto Sans SC", "PingFang SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-num: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --shell: 1240px;
  --gut: clamp(16px, 4vw, 40px);
  --cut: 18px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --hair: 1px solid var(--line);
}

/* ---------- 3. base ---------- */
body {
  min-height: 100vh;
  background-color: var(--bg);
  background-image:
    repeating-linear-gradient(115deg, rgba(31, 224, 164, .035) 0 1px, transparent 1px 14px),
    radial-gradient(900px 480px at 88% -8%, rgba(31, 224, 164, .09), transparent 62%),
    radial-gradient(760px 420px at -12% 18%, rgba(255, 138, 61, .055), transparent 62%);
  background-attachment: fixed;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: .03em;
  color: var(--paper);
}

h1 { font-size: clamp(2.1rem, 5.4vw, 3.6rem); letter-spacing: .02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); }
h4 { font-size: 1rem; }

p { max-width: 74ch; }

::selection { background: var(--neon); color: var(--coal); }

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

/* ---------- 4. 文本工具 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-num);
  font-size: .72rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--neon);
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--neon);
  flex: 0 0 auto;
}

.lede {
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  color: rgba(242, 247, 244, .84);
  line-height: 1.8;
}

.mono {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
}

.accent { color: var(--neon); }

.fee {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.link {
  position: relative;
  display: inline-block;
  color: var(--neon-2);
  padding-bottom: 1px;
}
.link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1px;
  background: var(--neon);
  transition: width .22s var(--ease);
}
.link:hover { color: var(--neon); }
.link:hover::after { width: 100%; }

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

.u-hidden { display: none !important; }

/* ---------- 5. 布局 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-left: var(--gut);
  padding-right: var(--gut);
}

.section {
  padding-top: clamp(48px, 7vw, 96px);
  padding-bottom: clamp(48px, 7vw, 96px);
}
.section--tight { padding-top: clamp(28px, 4vw, 52px); padding-bottom: clamp(28px, 4vw, 52px); }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  padding-bottom: 18px;
  margin-bottom: clamp(22px, 3vw, 36px);
  border-bottom: var(--hair);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: minmax(0, 8fr) minmax(0, 4fr); }
.grid--asym-rev { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); }

/* ---------- 6. 按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .6em;
  padding: .82em 1.35em;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--paper);
  font-family: var(--font-head);
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  transition: background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.btn::after {
  content: "";
  width: 7px; height: 7px;
  background: currentColor;
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  opacity: .75;
  flex: 0 0 auto;
}

.btn--primary {
  background: var(--neon);
  border-color: var(--neon);
  color: var(--coal);
}
.btn--primary:hover { background: var(--neon-2); border-color: var(--neon-2); }

.btn--amber {
  border-color: var(--amber);
  color: var(--amber-2);
}
.btn--amber:hover { background: rgba(255, 138, 61, .16); color: var(--paper); }

.btn--ghost {
  border-color: var(--line);
  color: var(--mist);
}
.btn--ghost:hover { border-color: var(--neon); color: var(--paper); }

.btn--sm {
  padding: .6em 1em;
  font-size: .8rem;
  letter-spacing: .1em;
}

/* ---------- 7. 面板 / 数据构件 ---------- */
.panel {
  position: relative;
  background: var(--panel);
  border: var(--hair);
  padding: clamp(18px, 2.4vw, 28px);
}

.panel--cut {
  border: 0;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  box-shadow: inset 0 0 0 1px var(--line);
  transition: box-shadow .22s var(--ease);
}
.panel--cut:hover { box-shadow: inset 0 0 0 1px var(--neon); }

.panel--dark { background: var(--coal); }

.panel__idx {
  display: block;
  font-family: var(--font-num);
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--neon);
  margin-bottom: 10px;
}

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.2rem, 5.6vw, 3.8rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--neon);
}
.stat__label {
  font-size: .82rem;
  letter-spacing: .08em;
  color: var(--mist);
}

.price-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 18px;
  padding: 14px 16px;
  border-bottom: var(--hair);
  transition: background .2s var(--ease);
}
.price-row:hover { background: rgba(31, 224, 164, .07); }
.price-row__name { font-weight: 600; }
.price-row__desc {
  grid-column: 1 / 2;
  font-size: .84rem;
  color: var(--mist);
  line-height: 1.6;
}
.price-row__amt {
  grid-row: 1 / 3;
  grid-column: 2 / 3;
  align-self: center;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  color: var(--amber);
  white-space: nowrap;
}

.index-list { border-top: var(--hair); }
.index-list__row {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 14px;
  padding: 16px 8px;
  border-bottom: var(--hair);
  transition: background .2s var(--ease);
}
.index-list__row:hover { background: rgba(31, 224, 164, .06); }
.index-list__idx {
  font-family: var(--font-num);
  font-size: .78rem;
  color: var(--neon);
}
.index-list__title {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: .03em;
}
.index-list__meta {
  font-family: var(--font-num);
  font-size: .76rem;
  color: var(--mist);
  white-space: nowrap;
}

.rail {
  position: relative;
  padding-left: 26px;
  border-left: 1px solid var(--line);
}
.rail__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) 0;
}
.rail__item:last-child { padding-bottom: 0; }
.rail__dot {
  position: absolute;
  left: -32px;
  top: 8px;
  width: 11px;
  height: 11px;
  background: var(--bg);
  border: 2px solid var(--neon);
  transform: rotate(45deg);
}
.rail__body > * + * { margin-top: 6px; }

details.fold {
  border: var(--hair);
  background: var(--coal);
  transition: border-color .2s var(--ease);
}
details.fold + details.fold { margin-top: 10px; }
details.fold[open] { border-color: var(--neon); }
.fold__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 18px;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: .04em;
  cursor: pointer;
  list-style: none;
}
.fold__summary::-webkit-details-marker { display: none; }
.fold__summary::after {
  content: "+";
  font-family: var(--font-num);
  color: var(--neon);
  font-size: 1.1rem;
  line-height: 1;
}
details.fold[open] .fold__summary::after { content: "–"; color: var(--amber); }
.fold__body {
  padding: 0 18px 18px;
  color: rgba(242, 247, 244, .82);
  font-size: .94rem;
  transition: opacity .18s var(--ease);
}

details.fold .fold__body > * + * { margin-top: 10px; }

.tab {
  padding: 8px 14px;
  border: 1px solid var(--line);
  font-family: var(--font-num);
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--mist);
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.tab:hover { color: var(--paper); border-color: var(--neon); }
.tab[aria-selected="true"] {
  background: var(--neon);
  border-color: var(--neon);
  color: var(--coal);
}

.filter-btn {
  padding: 7px 13px;
  border: 1px solid var(--line);
  font-family: var(--font-num);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--mist);
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.filter-btn:hover { color: var(--paper); border-color: var(--neon-2); }
.filter-btn[aria-pressed="true"] {
  background: rgba(255, 138, 61, .16);
  border-color: var(--amber);
  color: var(--amber-2);
}

/* ---------- 8. 图片容器（页面阶段放置占位图） ---------- */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--coal);
  border: var(--hair);
}
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.82) contrast(1.08) brightness(.84);
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(200deg, rgba(31, 224, 164, .12), transparent 46%),
    repeating-linear-gradient(135deg, rgba(255, 255, 255, .045) 0 1px, transparent 1px 9px);
}
.media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  padding: 9px 16px;
  background: linear-gradient(90deg, rgba(7, 28, 22, .94), rgba(7, 28, 22, 0));
  font-family: var(--font-num);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--neon-2);
}

/* ---------- 9. 面包屑 ---------- */
.crumb {
  padding-top: clamp(20px, 3vw, 34px);
  font-family: var(--font-num);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--mist);
}
.crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.crumb li { display: flex; align-items: center; gap: 8px; }
.crumb li + li::before { content: "/"; color: var(--line); }
.crumb a { transition: color .2s var(--ease); }
.crumb a:hover { color: var(--neon); }
.crumb [aria-current="page"] { color: var(--neon-2); }

/* ---------- 10. header ---------- */
.skip-link {
  position: fixed;
  left: 12px;
  top: -70px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--neon);
  color: var(--coal);
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: .08em;
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: var(--coal);
  border-bottom: var(--hair);
}

.cmd-rail {
  background: var(--bg);
  border-bottom: var(--hair);
}
.cmd-rail__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 34px;
  font-family: var(--font-num);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.cmd-rail__tag {
  color: var(--neon);
  flex: 0 0 auto;
}
.cmd-rail__tag::after {
  content: "";
  display: inline-block;
  width: 7px; height: 7px;
  margin-left: 10px;
  background: var(--neon);
  transform: rotate(45deg) translateY(-1px);
}
.cmd-rail__meta {
  flex: 1 1 auto;
  max-width: none;
  color: var(--mist);
  font-size: .72rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cmd-rail__link {
  position: relative;
  flex: 0 0 auto;
  color: var(--amber-2);
  padding-bottom: 1px;
}
.cmd-rail__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1px;
  background: var(--amber);
  transition: width .22s var(--ease);
}
.cmd-rail__link:hover { color: var(--paper); }
.cmd-rail__link:hover::after { width: 100%; }

.cmd-bar { position: relative; }
.cmd-bar__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  min-height: 66px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}
.brand__mark {
  position: relative;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  background: var(--neon);
  clip-path: polygon(0 0, 100% 0, 100% 64%, 64% 100%, 0 100%);
}
.brand__mark::after {
  content: "";
  position: absolute;
  left: 6px; right: 8px;
  top: 50%;
  height: 3px;
  background: var(--coal);
  transform: translateY(-50%) rotate(-38deg);
}
.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.06;
}
.brand__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.06rem;
  letter-spacing: .2em;
  color: var(--paper);
}
.brand__sub {
  font-family: var(--font-num);
  font-size: .6rem;
  letter-spacing: .22em;
  color: var(--mist);
  text-transform: uppercase;
}
.brand:hover .brand__mark { background: var(--neon-2); }

.nav { flex: 1 1 auto; }
.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.1vw, 16px);
}
.nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 4px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--mist);
  transition: color .2s var(--ease);
}
.nav__idx {
  font-family: var(--font-num);
  font-size: .62rem;
  letter-spacing: .06em;
  color: var(--line);
  transition: color .2s var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 4px;
  width: 0; height: 2px;
  background: var(--neon);
  transition: width .22s var(--ease);
}
.nav__link:hover { color: var(--paper); }
.nav__link:hover::after { width: 100%; }
.nav__link:hover .nav__idx { color: var(--neon); }
.nav__link[aria-current="page"] { color: var(--paper); }
.nav__link[aria-current="page"]::after {
  width: 100%;
  background: var(--amber);
}
.nav__link[aria-current="page"] .nav__idx { color: var(--amber); }

.nav__quick { display: none; }
.nav__quick-title {
  font-family: var(--font-num);
  font-size: .68rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--amber-2);
  padding: 16px 4px 6px;
  max-width: none;
}
.nav__quick-list { border-top: var(--hair); }
.nav__quick-link {
  display: block;
  padding: 12px 4px;
  border-bottom: var(--hair);
  font-size: .9rem;
  color: var(--mist);
}
.nav__quick-link:hover { color: var(--neon); }

.cmd-bar__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex: 0 0 auto;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  font-family: var(--font-num);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--mist);
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.chip--fee {
  border-color: rgba(255, 138, 61, .55);
  background: rgba(255, 138, 61, .09);
  color: var(--amber-2);
}
.chip--fee::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--amber);
  transform: rotate(45deg);
}
.chip--fee:hover {
  background: rgba(255, 138, 61, .2);
  border-color: var(--amber);
  color: var(--paper);
}

.nav-toggle {
  display: none;
  width: 46px;
  height: 42px;
  border: 1px solid var(--line);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.nav-toggle:hover { border-color: var(--neon); }
.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 20px;
}
.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--paper);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] { border-color: var(--neon); background: rgba(31, 224, 164, .1); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.scroll-rail {
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  pointer-events: none;
}
.scroll-rail__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--neon), var(--amber));
}

/* ---------- 11. footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  padding: clamp(40px, 5vw, 68px) 0 26px;
  background: var(--coal);
  border-top: var(--hair);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--neon) 0 28px, transparent 28px 56px);
  opacity: .55;
}
.site-footer::after {
  content: "";
  position: absolute;
  right: -90px; bottom: -80px;
  width: 360px; height: 360px;
  pointer-events: none;
  background: repeating-linear-gradient(135deg, rgba(31, 224, 164, .1) 0 1px, transparent 1px 13px);
  transform: rotate(-12deg);
}

.footer__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.25fr .85fr .85fr .75fr 1.5fr;
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

.footer__brand { display: flex; flex-direction: column; gap: 14px; }
.brand--footer .brand__mark { width: 30px; height: 30px; }
.footer__note {
  font-size: .86rem;
  color: var(--mist);
  line-height: 1.7;
  max-width: 30ch;
}
.footer__stamp {
  font-size: .68rem;
  letter-spacing: .22em;
  color: var(--line);
  text-transform: uppercase;
}

.footer__title {
  padding-bottom: 9px;
  margin-bottom: 12px;
  border-bottom: var(--hair);
  font-family: var(--font-head);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--neon-2);
}
.footer__list a {
  display: inline-block;
  padding: 5px 0;
  font-size: .9rem;
  color: var(--mist);
  transition: color .2s var(--ease), transform .2s var(--ease);
}
.footer__list a::before {
  content: "／";
  margin-right: 7px;
  color: var(--line);
  transition: color .2s var(--ease);
}
.footer__list a:hover { color: var(--paper); transform: translateX(3px); }
.footer__list a:hover::before { color: var(--neon); }

.contact-card {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--panel);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  box-shadow: inset 0 0 0 1px var(--line);
}
.contact-card__title {
  font-family: var(--font-head);
  font-size: .86rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber-2);
  margin-bottom: 10px;
}
.contact-card__list { border-top: 1px dashed var(--line); }
.contact-row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
}
.contact-row__k {
  font-family: var(--font-num);
  font-size: .68rem;
  letter-spacing: .1em;
  color: var(--neon);
}
.contact-row__v {
  font-size: .84rem;
  color: var(--paper);
  word-break: break-all;
  line-height: 1.55;
}
.copy-btn {
  padding: 4px 9px;
  border: 1px solid var(--line);
  font-family: var(--font-num);
  font-size: .68rem;
  letter-spacing: .06em;
  color: var(--mist);
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.copy-btn:hover { border-color: var(--neon); color: var(--neon); }
.copy-btn[data-copied="true"] {
  border-color: var(--neon);
  background: rgba(31, 224, 164, .14);
  color: var(--neon);
}
.contact-card__tip {
  margin-top: 12px;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--mist);
  max-width: none;
}

.footer__legal {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 18px;
  border-top: var(--hair);
  font-family: var(--font-num);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--mist);
}
.footer__legal p { max-width: none; }
.footer__icp { color: var(--neon-2); }

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 140;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--coal);
  border: 1px solid var(--line);
  color: var(--mist);
  font-family: var(--font-num);
  font-size: .72rem;
  letter-spacing: .08em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.to-top:hover { border-color: var(--neon); color: var(--neon); }
.to-top__arrow {
  width: 9px; height: 9px;
  background: currentColor;
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 28px;
  }
  .footer__brand { grid-column: 1 / -1; }
  .contact-card { grid-column: 1 / -1; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--asym,
  .grid--asym-rev { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 90px; }

  .nav {
    position: absolute;
    left: 0; right: 0;
    top: 100%;
    z-index: 118;
    display: none;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    padding: 4px var(--gut) 20px;
    background: var(--coal);
    border-bottom: var(--hair);
  }
  .nav[data-open] { display: block; }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav__item { border-bottom: var(--hair); }
  .nav__link {
    justify-content: flex-start;
    gap: 14px;
    padding: 15px 2px;
    font-size: 1rem;
  }
  .nav__link::after { bottom: 8px; width: 0; }
  .nav__idx { font-size: .7rem; color: var(--neon); }

  .nav__quick { display: block; }

  .nav-toggle { display: inline-flex; }
  .chip--fee { display: none; }
}

@media (max-width: 720px) {
  .cmd-rail__meta { display: none; }
  .cmd-rail__link { margin-left: auto; }
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .index-list__row {
    grid-template-columns: 40px minmax(0, 1fr);
    row-gap: 4px;
  }
  .index-list__meta { grid-column: 2 / 3; }
  .price-row { grid-template-columns: minmax(0, 1fr); }
  .price-row__amt { grid-row: auto; grid-column: 1 / 2; }
  .contact-row { grid-template-columns: 38px minmax(0, 1fr) auto; }
  .footer__grid { grid-template-columns: minmax(0, 1fr); }
  .footer__legal { justify-content: flex-start; }
  .to-top { padding: 9px 12px; font-size: .68rem; }
}

/* ---------- 13. 无障碍与减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .to-top { transform: none; }
}