/* ============================================================
   MANBETX主站 · 共享样式 /assets/site.css
   色阶：暗夜蓝底 / 深墨绿面板 / 墨绿卡槽 / 蓝墨分区
   强调：信号荧光绿（≤5%）、暖橙（≤3%）
   ============================================================ */

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

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

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

ul, ol { list-style: none; }

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

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

button { background: none; border: 0; cursor: pointer; }

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

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink-bg: #070C1A;
  --ink-green: #0B1F1A;
  --slot-green: #1E3B32;
  --blue-zone: #0E1630;
  --chalk: #F2F7F4;
  --mist: #B8C4C0;
  --mist-dim: rgba(184, 196, 192, 0.58);
  --signal: #39FF88;
  --warm: #FF9A3C;
  --line: rgba(184, 196, 192, 0.14);
  --edge: #2E5248;

  --font-display: "Helvetica Neue Condensed", "Arial Narrow", "PingFang SC", "Microsoft YaHei", "Heiti SC", sans-serif;
  --font-serif: Georgia, "Songti SC", "SimSun", "Noto Serif SC", serif;
  --font-mono: "SFMono-Regular", "SF Mono", Menlo, Consolas, "Courier New", monospace;
  --font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --wrap: 1360px;
  --gutter: clamp(16px, 3.4vw, 44px);
  --nav-break: 1080px;
}

/* ---------- 3. 基础排版与背景 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-bg);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: 0.004em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: -10%;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.45;
  animation: grid-drift 120s linear infinite;
}

body::after {
  content: "";
  position: fixed;
  left: -12%;
  top: -18%;
  width: 72vw;
  height: 72vw;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(circle at 50% 50%, rgba(57, 255, 136, 0.07), rgba(57, 255, 136, 0) 64%);
  animation: glow-drift 42s ease-in-out infinite alternate;
}

@keyframes grid-drift {
  from { background-position: 0 0, 0 0; }
  to { background-position: 88px 88px, 88px 88px; }
}

@keyframes glow-drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(16vw, 12vh, 0) scale(1.14); }
}

main,
.site-footer { position: relative; z-index: 1; }

h1, h2, h3, h4 {
  color: var(--chalk);
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.012em;
}

h1 { font-size: clamp(2.15rem, 5.2vw, 4.1rem); }
h2 { font-size: clamp(1.55rem, 3.1vw, 2.4rem); }
h3 { font-size: clamp(1.12rem, 1.8vw, 1.42rem); }
h4 { font-size: 1rem; letter-spacing: 0.02em; }

p { text-wrap: pretty; }

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

::selection { background: var(--signal); color: #04140C; }

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

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

.section {
  position: relative;
  padding-block: clamp(52px, 7.5vw, 112px);
  border-top: 1px solid var(--line);
}

.section--flush { border-top: 0; }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: clamp(16px, 3vw, 40px);
  padding-bottom: clamp(18px, 2.6vw, 32px);
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(24px, 3.4vw, 46px);
}

.section__head-text {
  flex: 1 1 260px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.section-number {
  font-family: var(--font-mono);
  font-size: clamp(3.4rem, 8vw, 6.6rem);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1px var(--edge);
}

@supports not ((-webkit-text-stroke: 1px #2E5248)) {
  .section-number { color: var(--slot-green); }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--signal);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--signal);
  flex: none;
}

.lede {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.04rem, 1.6vw, 1.28rem);
  line-height: 1.68;
  color: var(--chalk);
  max-width: 62ch;
}

.rule {
  height: 1px;
  border: 0;
  background: var(--line);
  margin: 0;
}

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 28px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

.start-1 { grid-column-start: 1; }
.start-2 { grid-column-start: 2; }
.start-3 { grid-column-start: 3; }
.start-4 { grid-column-start: 4; }
.start-5 { grid-column-start: 5; }
.start-6 { grid-column-start: 6; }
.start-7 { grid-column-start: 7; }

/* ---------- 5. 跳转链接 / 阅读进度 ---------- */
.skip-link {
  position: fixed;
  left: 14px;
  top: -70px;
  z-index: 200;
  padding: 11px 18px;
  background: var(--signal);
  color: #04140C;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.02em;
  transition: top 0.22s ease;
}

.skip-link:focus { top: 14px; }

.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  z-index: 120;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--signal), var(--warm));
  pointer-events: none;
}

/* ---------- 6. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(7, 12, 26, 0.94);
  border-bottom: 1px solid var(--edge);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.site-header__ticker {
  background: var(--blue-zone);
  border-bottom: 1px solid var(--line);
}

.site-header__ticker-inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 8px var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 20px;
}

.ticker-line {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
  line-height: 1.5;
}

.ticker-line__label {
  color: var(--signal);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  flex: none;
}

.ticker-line__value { color: var(--mist); }

.ticker-line--muted { color: var(--mist-dim); }

.pulse {
  width: 7px;
  height: 7px;
  flex: none;
  background: var(--signal);
  box-shadow: 0 0 0 0 rgba(57, 255, 136, 0.5);
  animation: pulse-soft 2.6s ease-out infinite;
}

@keyframes pulse-soft {
  0% { box-shadow: 0 0 0 0 rgba(57, 255, 136, 0.42); }
  70% { box-shadow: 0 0 0 9px rgba(57, 255, 136, 0); }
  100% { box-shadow: 0 0 0 0 rgba(57, 255, 136, 0); }
}

.site-header__bar {
  position: relative;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 12px var(--gutter);
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 40px);
}

/* 品牌块 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  flex: none;
  color: var(--chalk);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: none;
  border: 1px solid var(--signal);
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17.5px;
  letter-spacing: 0.015em;
  color: var(--chalk);
  line-height: 1.2;
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.07em;
  color: var(--mist-dim);
  line-height: 1.4;
}

.brand:focus-visible .brand__mark { background: rgba(57, 255, 136, 0.12); }

/* 导航 */
.site-nav { margin-left: auto; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.7vw, 26px);
}

.site-nav__item { flex: none; }

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 9px 2px;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.008em;
  color: var(--mist);
  white-space: nowrap;
  transition: color 0.2s ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 2px;
  height: 1px;
  background: var(--signal);
  transition: right 0.26s ease;
}

.site-nav__link:hover { color: var(--chalk); }
.site-nav__link:hover::after { right: 0; }

.site-nav__link[aria-current="page"] { color: var(--signal); }
.site-nav__link[aria-current="page"]::after {
  right: 0;
  background: var(--warm);
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--edge);
  color: var(--chalk);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.nav-toggle:hover,
.nav-toggle[aria-expanded="true"] {
  border-color: var(--signal);
  color: var(--signal);
}

.nav-toggle__bars {
  display: block;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 1px;
  margin: 4px 0;
  background: currentColor;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    padding: 6px var(--gutter) 18px;
    background: var(--ink-green);
    border-bottom: 1px solid var(--edge);
    box-shadow: 0 26px 60px rgba(0, 0, 0, 0.6);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
    max-height: 78vh;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .site-header[data-open] .site-nav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__item { border-bottom: 1px solid var(--line); }
  .site-nav__item:last-child { border-bottom: 0; }

  .site-nav__link {
    display: block;
    padding: 15px 2px;
    font-size: 16px;
    white-space: normal;
  }

  .site-nav__link::after { display: none; }

  .site-nav__link[aria-current="page"] {
    padding-left: 14px;
    border-left: 2px solid var(--signal);
  }
}

@media (max-width: 560px) {
  .brand__tagline { display: none; }
  .brand__mark { width: 36px; height: 36px; font-size: 12px; }
  .brand__name { font-size: 16px; }
  .ticker-line--muted { display: none; }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  border-top: 1px solid var(--edge);
  background: var(--blue-zone);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.55;
}

.site-footer__inner {
  position: relative;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(38px, 6vw, 74px) var(--gutter) clamp(26px, 4vw, 48px);
  display: grid;
  grid-template-columns: minmax(250px, 1.5fr) repeat(3, minmax(150px, 1fr));
  gap: clamp(24px, 3vw, 48px);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 360px;
}

.footer-brand__note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-dim);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--signal);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-list__link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.footer-list__link:hover {
  color: var(--chalk);
  border-bottom-color: var(--warm);
}

.footer-contact {
  display: grid;
  gap: 3px;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist-dim);
  margin-top: 9px;
}

.footer-contact__value {
  font-size: 14px;
  line-height: 1.65;
  color: var(--chalk);
  word-break: break-word;
}

.site-footer__base {
  position: relative;
  border-top: 1px solid var(--line);
  background: rgba(7, 12, 26, 0.55);
}

.site-footer__base-inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 18px var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  font-size: 13px;
  color: var(--mist-dim);
}

.footer-copy { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.03em; }

.footer-legal__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.footer-legal__link {
  font-size: 13px;
  color: var(--mist);
  border-bottom: 1px solid var(--line);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.footer-legal__link:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.footer-icp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist-dim);
}

.footer-note {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 0 var(--gutter) 26px;
  font-size: 12.5px;
  line-height: 1.75;
  color: rgba(184, 196, 192, 0.5);
}

@media (max-width: 1000px) {
  .site-footer__inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; max-width: 520px; }
}

@media (max-width: 600px) {
  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .site-footer__base-inner { flex-direction: column; align-items: flex-start; }
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid var(--edge);
  background: transparent;
  color: var(--chalk);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.btn:hover {
  border-color: var(--signal);
  color: var(--signal);
  background: rgba(57, 255, 136, 0.06);
}

.btn--signal {
  background: var(--signal);
  border-color: var(--signal);
  color: #04140C;
}

.btn--signal:hover {
  background: #62ffa6;
  border-color: #62ffa6;
  color: #04140C;
}

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

.btn--ghost:hover {
  border-color: var(--warm);
  color: var(--warm);
  background: rgba(255, 154, 60, 0.07);
}

.btn--sm { padding: 9px 15px; font-size: 13.5px; }

.btn__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  opacity: 0.72;
}

/* ---------- 9. 面板 / 卡片 / 标签 / 统计 ---------- */
.panel {
  position: relative;
  background: var(--ink-green);
  border: 1px solid var(--edge);
  padding: clamp(18px, 2.2vw, 30px);
}

.panel--slot { background: var(--slot-green); }
.panel--blue { background: var(--blue-zone); }

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 18px;
  padding-bottom: 13px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.panel__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--ink-green);
  border: 1px solid var(--edge);
  min-width: 0;
  transition: border-color 0.24s ease, transform 0.24s ease;
}

.card:hover,
.card:focus-within {
  border-color: var(--signal);
  transform: translateY(-3px);
}

.card__media {
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  background: var(--blue-zone);
}

.card__body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 20px 22px;
  flex: 1;
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.16rem;
  font-weight: 800;
  line-height: 1.28;
  color: var(--chalk);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist-dim);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.card__excerpt {
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

.card__more {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--warm);
}

.card--fold .card__excerpt {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.32s ease, opacity 0.32s ease;
}

.card--fold:hover .card__excerpt,
.card--fold:focus-within .card__excerpt {
  max-height: 14em;
  opacity: 1;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--edge);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
}

.tag--signal {
  color: var(--signal);
  border-color: rgba(57, 255, 136, 0.4);
  background: rgba(57, 255, 136, 0.06);
}

.tag--warm {
  color: var(--warm);
  border-color: rgba(255, 154, 60, 0.42);
  background: rgba(255, 154, 60, 0.07);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--signal);
}

.stat__label {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mist-dim);
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumbs {
  border-bottom: 1px solid var(--line);
  background: rgba(14, 22, 48, 0.5);
}

.breadcrumbs__list {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 13px var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--mist-dim);
}

.breadcrumbs__item:not(:last-child)::after {
  content: "/";
  color: var(--edge);
}

.breadcrumbs__link { color: var(--mist); transition: color 0.2s ease; }
.breadcrumbs__link:hover { color: var(--signal); }

/* ---------- 11. 标签页 ---------- */
.tabs { display: block; }

.tabs__list {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.tabs__tab {
  position: relative;
  flex: none;
  padding: 13px 20px;
  border: 1px solid transparent;
  border-bottom: 0;
  color: var(--mist);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.tabs__tab:hover { color: var(--chalk); }

.tabs__tab[aria-selected="true"] {
  color: var(--chalk);
  background: var(--ink-green);
  border-color: var(--edge);
}

.tabs__tab[aria-selected="true"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--signal);
}

.tabs__panel { display: none; padding-top: clamp(18px, 2.6vw, 32px); }

.tabs__panel.is-active {
  display: block;
  animation: tab-in 0.26s ease both;
}

@keyframes tab-in {
  from { opacity: 0; transform: translateX(-10px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ---------- 12. 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--blue-zone);
  border: 1px solid var(--edge);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.6;
}

.media-frame__label {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 1;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--chalk);
  background: linear-gradient(transparent, rgba(7, 12, 26, 0.88));
}

.media-frame__caption {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist-dim);
}

/* ---------- 13. 显现 ---------- */
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s cubic-bezier(0.2, 0.7, 0.2, 1), transform 0.55s cubic-bezier(0.2, 0.7, 0.2, 1);
}

html.has-js [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 14. 响应式网格收束 ---------- */
@media (max-width: 1000px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-9 { grid-column: span 6; }
  .start-1, .start-2, .start-3, .start-4, .start-5, .start-6, .start-7 { grid-column-start: auto; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-9, .span-12 { grid-column: span 12; }
  .section-number { font-size: clamp(2.6rem, 15vw, 4rem); }
}

/* ---------- 15. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  body::before,
  body::after,
  .pulse { animation: none !important; }

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

  .card:hover,
  .card:focus-within { transform: none; }
}