/* =========================================================
   /assets/site.css — 云体育看台 共享外壳与基础组件
   ========================================================= */

:root {
  --ink-void: #071E23;
  --ink-field: #0E3B43;
  --ink-stand: #12343A;
  --ink-line: #2A5459;
  --white: #F2FBF8;
  --paper: #F3FBF8;
  --mist: #A8C7C5;
  --cyan: #3DF0C8;
  --cyan-ink: #062A28;
  --orange: #FF7A3D;
  --orange-ink: #1D0A02;
  --amber: #FFC857;
  --mint: #0B6B5E;
  --deep-text: #0B262A;

  --font-display: "Barlow Condensed", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --font-data: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  --wrap: 1200px;
  --header-h: 72px;
  --cut: 18px;
  --step: 8px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

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

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

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

html, body {
  min-height: 100%;
}

body {
  background-color: var(--ink-void);
  background-image:
    radial-gradient(900px 520px at 88% -6%, rgba(61, 240, 200, 0.10), transparent 68%),
    radial-gradient(760px 460px at 4% 8%, rgba(255, 122, 61, 0.07), transparent 70%);
  background-repeat: no-repeat;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

a:hover {
  color: var(--white);
}

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

strong {
  font-weight: 700;
  color: var(--white);
}

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

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

/* ---------- 排版 ---------- */

h1, h2, h3, h4,
.display {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: 0.005em;
  color: var(--white);
  text-wrap: balance;
}

h1 { font-size: clamp(2.5rem, 6vw, 4.4rem); }
h2 { font-size: clamp(1.85rem, 3.6vw, 2.85rem); }
h3 { font-size: clamp(1.15rem, 1.9vw, 1.5rem); font-weight: 700; line-height: 1.2; }
h4 { font-size: 1.05rem; font-weight: 700; line-height: 1.3; }

p {
  max-width: 68ch;
}

.mono {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.85;
}

/* ---------- 容器与网格 ---------- */

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 24px;
}

.wrap--narrow {
  max-width: 800px;
}

.section {
  padding-block: clamp(56px, 8vw, 112px);
}

.section-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(28px, 4vw, 48px);
  max-width: 760px;
}

.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-side {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(24px, 5vw, 72px);
  align-items: center;
}

/* ---------- 页头 ---------- */

.skip-link {
  position: absolute;
  left: 12px;
  top: -64px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan);
  color: var(--cyan-ink);
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 12px;
  color: var(--cyan-ink);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.28s var(--ease), border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.site-header[data-stuck] {
  background: rgba(7, 30, 35, 0.94);
  border-bottom-color: var(--ink-line);
  box-shadow: 0 18px 44px rgba(3, 14, 17, 0.55);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  backdrop-filter: blur(14px) saturate(1.2);
}

.header-inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 26px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  flex: 0 0 auto;
}

.brand:hover {
  color: var(--white);
}

.brand-mark {
  position: relative;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border: 1px solid rgba(61, 240, 200, 0.42);
  background: linear-gradient(160deg, rgba(61, 240, 200, 0.20), rgba(14, 59, 67, 0.15) 62%, transparent);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  overflow: hidden;
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  left: -6px;
  width: 150%;
  height: 2px;
  transform: rotate(-24deg);
  transition: transform 0.3s var(--ease);
}

.brand-mark::before {
  top: 13px;
  background: var(--cyan);
}

.brand-mark::after {
  top: 23px;
  background: var(--orange);
  opacity: 0.85;
}

.brand:hover .brand-mark::before,
.brand:hover .brand-mark::after {
  transform: rotate(-24deg) translateX(4px);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.24rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.1;
}

.brand-tagline {
  font-family: var(--font-data);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  color: var(--mist);
  line-height: 1.4;
}

.header-utility {
  margin: 0;
  padding-left: 14px;
  border-left: 1px solid rgba(42, 84, 89, 0.9);
  font-family: var(--font-data);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--mist);
  white-space: nowrap;
  max-width: none;
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.4vw, 20px);
}

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

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 11px;
  color: var(--mist);
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.2;
  border: 1px solid transparent;
  border-radius: 2px;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.nav-index {
  font-family: var(--font-data);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: rgba(168, 199, 197, 0.5);
  transition: color 0.2s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--white);
  border-color: var(--ink-line);
  background: rgba(18, 52, 58, 0.72);
}

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

.nav-link[aria-current="page"] {
  color: var(--cyan);
  border-color: rgba(61, 240, 200, 0.45);
  background: rgba(61, 240, 200, 0.10);
}

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

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 3px;
  height: 1px;
  background: var(--cyan);
}

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

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid var(--ink-line);
  color: var(--white);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  color: var(--cyan);
  border-color: rgba(61, 240, 200, 0.6);
  background: rgba(61, 240, 200, 0.08);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.24s var(--ease), top 0.24s var(--ease);
}

.nav-toggle-bars::before { top: 2px; }
.nav-toggle-bars::after { top: 9px; }

.site-header[data-open] .nav-toggle-bars::before {
  top: 5px;
  transform: rotate(45deg);
}

.site-header[data-open] .nav-toggle-bars::after {
  top: 5px;
  transform: rotate(-45deg);
}

.nav-toggle-label {
  line-height: 1;
}

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.header-progress-bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan) 72%, var(--orange) 100%);
}

/* ---------- 页脚 ---------- */

.site-footer {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: linear-gradient(180deg, var(--ink-field) 0%, #0A2A30 46%, var(--ink-void) 100%);
  border-top: 1px solid var(--ink-line);
  color: var(--white);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(640px 340px at 10% -12%, rgba(61, 240, 200, 0.16), transparent 70%),
    radial-gradient(520px 300px at 94% 6%, rgba(255, 122, 61, 0.13), transparent 74%);
  pointer-events: none;
}

.footer-track {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 5px;
  background-image: repeating-linear-gradient(90deg, rgba(61, 240, 200, 0.55) 0 26px, transparent 26px 52px);
  opacity: 0.32;
}

.footer-inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(48px, 6vw, 76px) 24px clamp(32px, 4vw, 48px);
  display: grid;
  grid-template-columns: 1.45fr 0.9fr 1.15fr 0.95fr;
  gap: clamp(24px, 3.4vw, 48px);
  align-items: start;
}

.footer-lead {
  display: grid;
  gap: 10px;
  justify-items: start;
}

.footer-kicker {
  font-family: var(--font-data);
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  color: var(--cyan);
  max-width: none;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3vw, 2.6rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--white);
  max-width: none;
}

.footer-tagline {
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--orange);
  max-width: none;
}

.footer-summary {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mist);
  max-width: 34ch;
  margin-bottom: 6px;
}

.footer-col {
  display: grid;
  gap: 12px;
  align-content: start;
}

.footer-col-title {
  font-family: var(--font-data);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(42, 84, 89, 0.85);
  max-width: none;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-link {
  display: inline-block;
  padding: 2px 0 2px 12px;
  position: relative;
  color: var(--white);
  font-size: 0.92rem;
}

.footer-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 6px;
  height: 1px;
  background: var(--ink-line);
  transition: width 0.22s var(--ease), background-color 0.22s var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--cyan);
}

.footer-link:hover::before,
.footer-link:focus-visible::before {
  width: 10px;
  background: var(--cyan);
}

.footer-contact-list {
  display: grid;
  gap: 10px;
}

.footer-contact-item {
  display: grid;
  gap: 2px;
}

.footer-contact-label {
  font-family: var(--font-data);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.footer-contact-value {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--white);
  word-break: break-word;
}

.footer-service {
  padding: 14px 16px;
  border: 1px solid rgba(255, 200, 87, 0.28);
  background: rgba(255, 200, 87, 0.06);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.footer-note {
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--mist);
  max-width: none;
}

.footer-base {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 20px 24px 32px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 28px;
  border-top: 1px solid rgba(42, 84, 89, 0.7);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.footer-copy,
.footer-icp {
  max-width: none;
  margin: 0;
}

.footer-icp {
  color: rgba(168, 199, 197, 0.86);
}

.footer-legal {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
}

.footer-legal-link {
  color: var(--mist);
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.footer-legal-link:hover,
.footer-legal-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.1;
  text-align: center;
  border: 1px solid transparent;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--cyan);
  color: var(--cyan-ink);
  border-color: var(--cyan);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #63F6D6;
  color: var(--cyan-ink);
  border-color: var(--white);
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(61, 240, 200, 0.08);
}

.btn-ghost-light {
  background: transparent;
  color: var(--deep-text);
  border-color: rgba(11, 107, 94, 0.45);
}

.btn-ghost-light:hover,
.btn-ghost-light:focus-visible {
  color: var(--paper);
  background: var(--mint);
  border-color: var(--mint);
}

/* ---------- 面包屑 ---------- */

.breadcrumb {
  padding-block: 18px 0;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

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

.breadcrumb-link {
  color: var(--mist);
  border-bottom: 1px solid transparent;
}

.breadcrumb-link:hover,
.breadcrumb-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.breadcrumb-sep {
  color: rgba(42, 84, 89, 1);
}

.breadcrumb-current {
  color: var(--white);
}

/* ---------- 页面标题区 ---------- */

.page-head {
  position: relative;
  padding-block: clamp(40px, 6vw, 84px) clamp(32px, 5vw, 64px);
  border-bottom: 1px solid rgba(42, 84, 89, 0.6);
}

.page-head::after {
  content: "";
  position: absolute;
  left: 24px;
  bottom: -1px;
  width: clamp(64px, 12vw, 148px);
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.page-kicker {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-title {
  max-width: 18ch;
}

.page-lead {
  margin-top: 18px;
  font-size: clamp(0.98rem, 1.4vw, 1.1rem);
  line-height: 1.8;
  color: var(--mist);
  max-width: 56ch;
}

/* ---------- 面板 ---------- */

.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--ink-stand);
  border: 1px solid var(--ink-line);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.panel-cut {
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.panel-cut:hover {
  border-color: rgba(61, 240, 200, 0.55);
  transform: translateY(-3px);
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(42, 84, 89, 0.75);
}

.panel-title {
  font-family: var(--font-display);
  font-size: 1.16rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0;
}

.panel-meta {
  font-family: var(--font-data);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--mist);
  max-width: none;
}

/* ---------- 数据与标签 ---------- */

.figure {
  display: grid;
  gap: 2px;
}

.figure-value {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.figure-label {
  font-family: var(--font-data);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-data);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  line-height: 1.5;
  border: 1px solid var(--ink-line);
  color: var(--mist);
  background: rgba(18, 52, 58, 0.7);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}

.chip-cyan {
  color: var(--cyan-ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.chip-orange {
  color: var(--orange-ink);
  background: var(--orange);
  border-color: var(--orange);
}

.chip-amber {
  color: var(--orange-ink);
  background: var(--amber);
  border-color: var(--amber);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  border-bottom: 1px solid rgba(61, 240, 200, 0.35);
  padding-bottom: 3px;
}

.link-arrow::after {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
  transition: transform 0.22s var(--ease);
}

.link-arrow:hover::after,
.link-arrow:focus-visible::after {
  transform: translateX(6px);
}

/* ---------- 纵向碰面通道 ---------- */

.rail {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  align-self: start;
}

.rail-list {
  display: grid;
  gap: 2px;
  padding-left: 12px;
  border-left: 1px solid rgba(42, 84, 89, 0.9);
}

.rail-item {
  position: relative;
}

.rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 10px;
  color: var(--mist);
  font-size: 0.88rem;
  border-left: 2px solid transparent;
  margin-left: -14px;
  padding-left: 12px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.rail-num {
  font-family: var(--font-data);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  color: rgba(168, 199, 197, 0.6);
}

.rail-link:hover,
.rail-link:focus-visible {
  color: var(--white);
  border-left-color: var(--ink-line);
  background: rgba(18, 52, 58, 0.6);
}

.rail-link[aria-current="page"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(61, 240, 200, 0.08);
}

/* ---------- 图片容器基础规则 ---------- */

.media {
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(150deg, var(--ink-stand), var(--ink-field));
  border: 1px solid var(--ink-line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: inherit;
  overflow: hidden;
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    repeating-linear-gradient(118deg, rgba(61, 240, 200, 0.10) 0 2px, transparent 2px 46px),
    radial-gradient(120% 120% at 18% 0%, rgba(61, 240, 200, 0.16), transparent 62%),
    radial-gradient(90% 90% at 96% 100%, rgba(255, 122, 61, 0.16), transparent 66%);
}

.media img,
.media-frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.media-caption {
  position: relative;
  z-index: 1;
  padding: 10px 14px;
  font-family: var(--font-data);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--mist);
  border-top: 1px solid rgba(42, 84, 89, 0.85);
  background: rgba(7, 30, 35, 0.55);
}

.media-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  padding: 4px 10px;
  font-family: var(--font-data);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  color: var(--cyan-ink);
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%);
}

/* ---------- 显现协议 ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

[data-reveal][data-visible="true"] {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */

@media (max-width: 1080px) {
  .header-utility { display: none; }
  .nav-link { padding: 8px 9px; font-size: 0.85rem; }
  .footer-inner { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-service { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  :root { --header-h: 64px; }

  .site-header {
    background: rgba(7, 30, 35, 0.94);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom-color: rgba(42, 84, 89, 0.8);
  }

  .header-inner {
    padding: 12px 18px;
    gap: 12px;
  }

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 6px 18px 22px;
    background: var(--ink-field);
    border-bottom: 1px solid var(--ink-line);
    box-shadow: 0 28px 52px rgba(3, 14, 17, 0.6);
  }

  .site-header[data-open] .site-nav,
  .site-nav[data-open] { display: flex; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    padding: 14px 10px;
    font-size: 1rem;
    border: 0;
    border-bottom: 1px solid rgba(42, 84, 89, 0.55);
    border-left: 2px solid transparent;
    border-radius: 0;
    justify-content: flex-start;
  }

  .nav-link:hover,
  .nav-link:focus-visible {
    background: rgba(18, 52, 58, 0.85);
    border-color: transparent;
    border-bottom-color: rgba(42, 84, 89, 0.55);
    border-left-color: var(--ink-line);
  }

  .nav-link[aria-current="page"] {
    background: rgba(61, 240, 200, 0.10);
    border-color: transparent;
    border-bottom-color: rgba(42, 84, 89, 0.55);
    border-left-color: var(--cyan);
  }

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

  .nav-cta {
    margin-top: 18px;
    width: 100%;
  }

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

  .rail {
    position: static;
    top: auto;
  }

  .rail-list {
    display: flex;
    overflow-x: auto;
    padding: 0 0 8px;
    border-left: 0;
    border-bottom: 1px solid rgba(42, 84, 89, 0.9);
    -webkit-overflow-scrolling: touch;
  }

  .rail-link {
    margin-left: 0;
    border-left: 0;
    border-bottom: 2px solid transparent;
    padding: 8px 12px;
    white-space: nowrap;
  }

  .rail-link[aria-current="page"] {
    border-left: 0;
    border-bottom-color: var(--cyan);
  }
}

@media (max-width: 760px) {
  .wrap { padding-inline: 18px; }
  .header-inner { padding-inline: 18px; }
  .page-head::after { left: 18px; }
  .footer-inner { grid-template-columns: minmax(0, 1fr); padding-inline: 18px; }
  .footer-base { padding-inline: 18px; flex-direction: column; align-items: flex-start; gap: 10px; }
  .footer-legal { margin-left: 0; }
  .brand-tagline { display: none; }
  .brand-name { font-size: 1.12rem; }
  .nav-toggle-label { display: none; }
  .page-title { max-width: none; }
}


/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .btn:hover,
  .panel-cut:hover {
    transform: none;
  }

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