/* ==========================================================================
   亚美体育CN · 共享样式 /assets/site.css
   夜场指挥台：深空蓝底 + 竞技橙 + 荧光青，粗边框硬阴影，零圆角
   ========================================================================== */

/* 1. 变量 */
:root {
  --ink: #0A1224;
  --panel: #111C36;
  --line: #1B2A4A;
  --orange: #FF6B1A;
  --cyan: #35F2D0;
  --white: #F4F7FF;
  --muted: #A9B6D0;
  --faint: #6F7FA3;
  --yellow: #E9B44C;
  --green: #2E7D5B;
  --text-soft: #D6DEF0;
  --max: 1240px;
  --gutter: 24px;
  --shadow-hard: 8px 8px 0 rgba(0, 0, 0, 0.42);
  --shadow-soft: 0 18px 40px rgba(0, 0, 0, 0.35);
  --font-display: "Oswald", "Bebas Neue", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", "Noto Sans Mono CJK SC", ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* 2. 重置与基础 */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background:
    radial-gradient(900px 520px at 88% -10%, rgba(255, 107, 26, 0.10), transparent 62%),
    radial-gradient(760px 440px at 2% 6%, rgba(53, 242, 208, 0.07), transparent 64%),
    var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--white);
}

h1 { font-size: clamp(2.4rem, 5.4vw, 4.75rem); }
h2 { font-size: clamp(1.9rem, 3.4vw, 2.9rem); }
h3 { font-size: clamp(1.25rem, 1.9vw, 1.6rem); }

p { margin: 0 0 1.05em; }

a {
  color: var(--cyan);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

ul, ol { margin: 0 0 1em; padding-left: 1.2em; }
li { margin: 0.2em 0; }

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

strong { color: var(--white); }

hr {
  border: 0;
  border-top: 2px solid var(--line);
  margin: 32px 0;
}

[hidden] { display: none !important; }

::selection { background: var(--orange); color: #160800; }

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

#main-content { scroll-margin-top: 140px; }

/* 3. 布局容器 */
.container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: 880px; }

/* 4. 章节与编号体系 */
.section {
  padding: clamp(44px, 6vw, 84px) 0;
  border-top: 2px solid var(--line);
}
.section:first-of-type { border-top: 0; }

.section-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 3vw, 40px);
}

.section-index {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--orange);
}
@supports (-webkit-text-stroke: 1px #000) {
  .section-index {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--orange);
  }
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}
.kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--orange);
}

.section-title { margin: 0; font-size: clamp(1.75rem, 3vw, 2.5rem); }
.section-sub {
  margin: 6px 0 0;
  max-width: 52ch;
  font-size: 15px;
  color: var(--muted);
}

/* 5. 网格 */
.grid { display: grid; gap: clamp(16px, 2vw, 24px); }

.grid-2 {
  display: grid;
  gap: clamp(16px, 2vw, 24px);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  display: grid;
  gap: clamp(16px, 2vw, 24px);
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.split {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
}

/* 6. 面板 */
.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--panel);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}

.panel-body {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-soft);
}

/* 7. 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 24px;
  border: 2px solid var(--line);
  background: transparent;
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.btn:hover {
  transform: translate(-2px, -2px);
  text-decoration: none;
}

.btn-primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #180A00;
  box-shadow: 6px 6px 0 rgba(255, 107, 26, 0.2);
}
.btn-primary:hover { box-shadow: 9px 9px 0 rgba(255, 107, 26, 0.28); }

.btn-ghost { color: var(--white); }
.btn-ghost:hover {
  border-color: var(--cyan);
  background: rgba(53, 242, 208, 0.06);
  color: var(--cyan);
}

.btn-sm { padding: 10px 16px; font-size: 12px; }

/* 8. 面包屑 */
.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--faint);
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.breadcrumbs li { margin: 0; }
.breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.breadcrumbs a { color: var(--muted); text-decoration: none; }
.breadcrumbs a:hover { color: var(--cyan); text-decoration: none; }
.breadcrumbs [aria-current="page"] { color: var(--white); }

/* 9. 正文 */
.prose {
  max-width: 40em;
  color: var(--text-soft);
}
.prose h2,
.prose h3 { margin-top: 1.6em; }
.prose p { margin: 0 0 1.1em; }
.prose ul,
.prose ol { color: var(--text-soft); }
.prose li { margin: 0.35em 0; }
.prose strong { color: var(--white); }
.prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.prose blockquote {
  margin: 1.4em 0;
  padding: 14px 18px;
  border-left: 4px solid var(--orange);
  background: var(--panel);
  color: var(--white);
}
.prose code {
  padding: 1px 6px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-family: var(--font-mono);
  font-size: 0.92em;
}

/* 10. 图片容器基础规则（页面阶段放入 img） */
.media-frame {
  position: relative;
  overflow: hidden;
  margin: 0;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, #152444 0%, #0A1224 65%);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 36px 36px;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--faint);
}

/* 11. 数据组件 */
.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 16px;
  border: 2px solid var(--line);
  background: rgba(17, 28, 54, 0.72);
}
.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 2.2vw, 1.9rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--white);
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}

.data-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.data-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 10px 2px;
  border-bottom: 1px solid var(--line);
}
.data-key { font-size: 14px; color: var(--muted); }
.data-val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
  text-align: right;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  background: rgba(10, 18, 36, 0.6);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}
.tag--live {
  border-color: var(--orange);
  background: rgba(255, 107, 26, 0.1);
  color: var(--orange);
}
.tag--ok {
  border-color: var(--cyan);
  background: rgba(53, 242, 208, 0.08);
  color: var(--cyan);
}

/* 12. 分段切换 */
.seg {
  display: flex;
  flex-wrap: wrap;
  width: max-content;
  max-width: 100%;
  border: 2px solid var(--line);
  background: var(--ink);
}
.seg-btn {
  appearance: none;
  padding: 10px 16px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease;
}
.seg-btn:last-child { border-right: 0; }
.seg-btn:hover { color: var(--white); }
.seg-btn[aria-selected="true"] {
  background: var(--orange);
  color: #180A00;
}

/* 13. 显现 */
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}
html.has-js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ==========================================================================
   页头
   ========================================================================== */
.skip-link {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 200;
  padding: 12px 18px;
  background: var(--cyan);
  color: #04140F;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: top 0.18s ease;
}
.skip-link:focus { top: 10px; text-decoration: none; }
.skip-link:focus-visible { outline: 3px solid var(--white); outline-offset: 2px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--ink);
  border-bottom: 2px solid var(--line);
  isolation: isolate;
}

.header-rail {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.rail-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding: 7px var(--gutter);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--faint);
}
.rail-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  color: var(--cyan);
  letter-spacing: 0.04em;
}
.rail-dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 107, 26, 0.22);
  animation: railPulse 2.6s ease-in-out infinite;
}
@keyframes railPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.32; }
}
.rail-meta {
  margin: 0;
  color: var(--faint);
  white-space: nowrap;
}

.header-frame { position: relative; }
.header-frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  pointer-events: none;
  opacity: 0.85;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 15px);
}

.frame-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  width: 100%;
  max-width: var(--max);
  min-height: 78px;
  margin-inline: auto;
  padding: 12px var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  text-decoration: none;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  border: 2px solid var(--orange);
  background: rgba(255, 107, 26, 0.08);
  color: var(--orange);
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.06em;
  box-shadow: 4px 4px 0 rgba(255, 107, 26, 0.16);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  line-height: 1;
}
.brand-name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--white);
}
.brand-note {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1;
  letter-spacing: 0.24em;
  color: var(--faint);
}

.primary-nav { justify-self: end; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-item { margin: 0; }
.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 11px 12px;
  border: 2px solid transparent;
  color: var(--muted);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  transition: color 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}
.nav-link:hover {
  background: var(--panel);
  border-color: var(--line);
  color: var(--white);
  text-decoration: none;
}
.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--faint);
  transition: color 0.18s ease;
}
.nav-link[aria-current="page"] {
  background: var(--orange);
  border-color: var(--orange);
  color: #180A00;
}
.nav-link[aria-current="page"] .nav-index { color: rgba(24, 10, 0, 0.62); }
.nav-link[aria-current="page"]:hover {
  background: var(--orange);
  border-color: var(--orange);
  color: #180A00;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border: 2px solid var(--cyan);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  white-space: nowrap;
  text-decoration: none;
  box-shadow: 4px 4px 0 rgba(53, 242, 208, 0.16);
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.header-cta::before {
  content: "▸";
  font-size: 11px;
  line-height: 1;
}
.header-cta:hover {
  background: var(--cyan);
  color: #04140F;
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 rgba(53, 242, 208, 0.22);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-self: end;
  gap: 10px;
  padding: 10px 14px;
  border: 2px solid var(--line);
  background: transparent;
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}
.nav-toggle:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}
.nav-toggle-label { line-height: 1; }
.nav-toggle-icon {
  display: grid;
  gap: 4px;
  width: 18px;
}
.nav-toggle-icon span {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
[data-open] .nav-toggle-icon span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
[data-open] .nav-toggle-icon span:nth-child(2) { opacity: 0; }
[data-open] .nav-toggle-icon span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.site-header[data-open] .nav-toggle {
  border-color: var(--orange);
  color: var(--orange);
}

.nav-progress {
  position: absolute;
  left: 0;
  bottom: -2px;
  z-index: 3;
  width: 100%;
  height: 3px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--orange), var(--cyan));
  will-change: transform;
  transition: transform 0.08s linear;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  position: relative;
  background: var(--panel);
  border-top: 3px solid var(--orange);
  color: var(--muted);
  font-size: 14px;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 6px;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 15px);
}

.footer-inner {
  position: relative;
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding: 36px var(--gutter) 26px;
}

.footer-contact {
  padding: clamp(18px, 2.4vw, 26px);
  border: 2px solid var(--cyan);
  background: rgba(53, 242, 208, 0.045);
  box-shadow: 6px 6px 0 rgba(53, 242, 208, 0.1);
}

.contact-label {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.contact-label::before {
  content: "";
  width: 10px;
  height: 10px;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(53, 242, 208, 0.8);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) auto;
  gap: 16px 24px;
  align-items: end;
}
.contact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  padding-left: 12px;
  border-left: 2px solid var(--line);
}
.contact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}
.contact-value {
  color: var(--white);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  word-break: break-all;
}
.contact-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border: 2px solid var(--cyan);
  background: var(--cyan);
  color: #04140F;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.35);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.contact-cta:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.4);
  text-decoration: none;
}
.contact-note {
  max-width: 78ch;
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--faint);
}

.footer-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  gap: clamp(20px, 3vw, 44px);
  margin-top: clamp(24px, 3vw, 38px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 2px solid var(--line);
}
.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.footer-brand-text {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.footer-brand-name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--white);
}
.footer-brand-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: 0.08em;
  color: var(--faint);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.link-group { min-width: 0; }
.link-group-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
}
.link-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.link-list li { margin: 0; }
.link-list a {
  border-bottom: 1px solid transparent;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.link-list a:hover {
  border-bottom-color: var(--cyan);
  color: var(--cyan);
  text-decoration: none;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  margin-top: clamp(22px, 3vw, 32px);
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--faint);
}
.footer-legal,
.footer-icp { margin: 0; }

.contact-chip {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  border: 2px solid var(--cyan);
  background: rgba(10, 18, 36, 0.94);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-decoration: none;
  box-shadow: 0 0 0 4px rgba(53, 242, 208, 0.08);
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.contact-chip::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}
.contact-chip:hover {
  background: var(--cyan);
  color: #04140F;
  transform: translateY(-2px);
  text-decoration: none;
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; }

  .primary-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 5;
    max-height: calc(100vh - 130px);
    overflow-y: auto;
    background: var(--panel);
    border-top: 2px solid var(--line);
    border-bottom: 2px solid var(--orange);
    box-shadow: var(--shadow-soft);
  }
  .site-header[data-open] .primary-nav,
  .site-header[data-open] .primary-nav[data-open],
  .primary-nav[data-open] { display: block; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-item { border-bottom: 1px solid var(--line); }
  .nav-item:last-child { border-bottom: 0; }
  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 15px var(--gutter);
    border: 0;
    font-size: 16px;
  }
  .nav-link:hover { background: rgba(255, 107, 26, 0.08); border: 0; }
  .nav-link[aria-current="page"] { border: 0; }
}

@media (max-width: 900px) {
  .grid-2,
  .grid-3,
  .split { grid-template-columns: minmax(0, 1fr); }

  .contact-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contact-cta {
    grid-column: 1 / -1;
    justify-self: start;
  }

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

@media (max-width: 640px) {
  :root { --gutter: 18px; }

  .rail-meta { display: none; }
  .rail-inner { padding: 6px var(--gutter); font-size: 11px; }

  .frame-inner { min-height: 66px; padding: 10px var(--gutter); }
  .brand-mark { width: 38px; height: 38px; font-size: 15px; }
  .brand-name { font-size: 18px; }
  .brand-note { font-size: 9px; letter-spacing: 0.18em; }
  .header-cta { display: none; }
  .nav-toggle { padding: 9px 12px; }

  .contact-grid { grid-template-columns: minmax(0, 1fr); }
  .contact-value { font-size: 14px; }
  .footer-links { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
  .footer-meta { font-size: 11px; }

  .contact-chip {
    right: 12px;
    bottom: 12px;
    padding: 9px 12px;
    font-size: 11px;
  }
}

/* ==========================================================================
   动效降级
   ========================================================================== */
@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;
  }

  html.has-js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .rail-dot { animation: none; opacity: 1; }
}