/* ==========================================================================
   竞博体育官网 · 共享样式表 /assets/site.css
   设计母题：夜间竞技场精密仪表盘 · 纵向叙事长卷 · 现代粗野主义
   ========================================================================== */

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

:root {
  --navy: #0A1230;
  --navy-deep: #060B1E;
  --navy-2: #131C46;
  --navy-3: #0E1738;

  --cyan: #1FE0D0;
  --cyan-mist: #7BF3E6;
  --orange: #FF6A2B;
  --red: #FF3B57;
  --violet: #6B4DFF;
  --ice: #F2F6FF;
  --slate: #8A97BE;
  --lime: #C6F53C;

  --ink-dark: #04121A;
  --line: rgba(127, 163, 255, .18);
  --line-strong: rgba(127, 163, 255, .34);

  --font-head: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Consolas, "Liberation Mono", "Courier New", monospace;

  --shell: 1240px;
  --pad: clamp(16px, 4.2vw, 44px);
  --radius: 2px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: 260ms;

  --shadow-hard: 8px 8px 0 rgba(3, 7, 20, .92);
  --shadow-hard-hover: 11px 11px 0 rgba(3, 7, 20, .96);
}

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

body {
  margin: 0;
  background-color: var(--navy);
  background-image:
    linear-gradient(180deg, rgba(19, 28, 70, .55) 0%, rgba(10, 18, 48, 0) 38%),
    linear-gradient(90deg, rgba(31, 224, 208, .05) 0%, rgba(10, 18, 48, 0) 30%);
  color: var(--ice);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  letter-spacing: .01em;
  overflow-wrap: break-word;
  -webkit-tap-highlight-color: transparent;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--ice);
  text-wrap: balance;
  margin: 0;
}

p { margin: 0 0 .9em; }
p:last-child { margin-bottom: 0; }

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

a { color: var(--cyan-mist); text-decoration: none; }
a:hover { color: var(--cyan); }

ul, ol { margin: 0; padding: 0; }

button { font: inherit; color: inherit; }

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

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

/* ---------- 跳转链接 ---------- */

.skip-link {
  position: absolute;
  left: 14px;
  top: -80px;
  z-index: 200;
  padding: 11px 18px;
  background: var(--orange);
  color: #1B0700;
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .1em;
  border-radius: var(--radius);
  box-shadow: 4px 4px 0 rgba(3, 7, 20, .9);
  transition: top 180ms var(--ease);
}
.skip-link:focus { top: 14px; color: #1B0700; }

/* ---------- 容器与章节 ---------- */

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section { padding-block: clamp(48px, 7vw, 96px); }
.section--tight { padding-block: clamp(28px, 4vw, 50px); }

.stack { display: flex; flex-direction: column; gap: var(--gap, 14px); }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }

/* ---------- 文字层级 ---------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--cyan);
  flex: none;
}

.display {
  font-size: clamp(34px, 7vw, 68px);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.06;
}

.h2 {
  font-size: clamp(24px, 3.6vw, 40px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.16;
}

.h3 {
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.34;
}

.lede {
  font-size: clamp(15.5px, 1.6vw, 18px);
  line-height: 1.78;
  color: #C3CFEC;
  max-width: 62ch;
}

.prose {
  max-width: 68ch;
  color: #D3DCF4;
}
.prose > * + * { margin-top: .9em; }
.prose h2 { font-size: clamp(20px, 2.6vw, 28px); font-weight: 800; margin-top: 1.6em; }
.prose h3 { font-size: 18px; font-weight: 700; margin-top: 1.4em; color: var(--cyan-mist); }
.prose ul, .prose ol { padding-left: 1.2em; color: #C3CFEC; }
.prose li + li { margin-top: .35em; }
.prose strong { color: var(--ice); font-weight: 700; }

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

/* ---------- 标签 ---------- */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid rgba(31, 224, 208, .42);
  border-radius: var(--radius);
  background: rgba(31, 224, 208, .08);
  color: var(--cyan-mist);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
  line-height: 1.5;
  white-space: nowrap;
}
.tag--orange {
  border-color: rgba(255, 106, 43, .5);
  background: rgba(255, 106, 43, .12);
  color: #FFB68F;
}
.tag--violet {
  border-color: rgba(107, 77, 255, .55);
  background: rgba(107, 77, 255, .14);
  color: #C0B0FF;
}
.tag--lime {
  border-color: rgba(198, 245, 60, .5);
  background: rgba(198, 245, 60, .12);
  color: #DFFF8C;
}

/* ---------- 按钮 ---------- */

.btn {
  --btn-bg: transparent;
  --btn-fg: var(--ice);
  --btn-line: var(--line-strong);
  --btn-shadow: rgba(3, 7, 20, .9);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid var(--btn-line);
  border-radius: var(--radius);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  line-height: 1.2;
  white-space: nowrap;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 4px 4px 0 var(--btn-shadow);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--btn-shadow);
}
.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 var(--btn-shadow);
}

.btn--primary {
  --btn-bg: var(--cyan);
  --btn-fg: var(--ink-dark);
  --btn-line: var(--cyan);
  --btn-shadow: rgba(255, 106, 43, .8);
}
.btn--primary:hover { --btn-line: var(--cyan-mist); }

.btn--ghost {
  --btn-bg: rgba(19, 28, 70, .62);
  --btn-fg: var(--ice);
  --btn-line: var(--line-strong);
}
.btn--ghost:hover { --btn-line: var(--cyan); --btn-fg: var(--cyan-mist); }

.btn--orange {
  --btn-bg: var(--orange);
  --btn-fg: #1B0700;
  --btn-line: var(--orange);
  --btn-shadow: rgba(31, 224, 208, .55);
}

.btn--quiet {
  --btn-bg: transparent;
  --btn-fg: var(--slate);
  --btn-line: rgba(127, 163, 255, .22);
  --btn-shadow: transparent;
  box-shadow: none;
}
.btn--quiet:hover { --btn-fg: var(--ice); box-shadow: none; }

.btn--block { width: 100%; }

.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: .42;
  filter: saturate(.3);
  pointer-events: none;
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--cyan);
}
.link-more::after {
  content: "";
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: width var(--dur) var(--ease);
}
.link-more:hover::after { width: 28px; }

/* ==========================================================================
   页头
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(10, 18, 48, .98), rgba(10, 18, 48, .94));
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-utility {
  background: linear-gradient(90deg, rgba(19, 28, 70, .85) 0%, rgba(10, 18, 48, .6) 55%, rgba(107, 77, 255, .12) 100%);
  border-bottom: 1px solid rgba(127, 163, 255, .12);
}

.header-utility__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  padding-block: 13px;
  transition: padding var(--dur) var(--ease);
}

[data-scrolled="true"] .header-utility__inner { padding-block: 8px; }

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
  color: var(--ice);
  text-decoration: none;
}
.brand:hover { color: var(--ice); }

.brand__mark {
  flex: none;
  display: grid;
  place-items: center;
  padding: 7px 10px;
  background: var(--cyan);
  color: var(--ink-dark);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: .14em;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 86% 100%, 0 100%);
  filter: drop-shadow(3px 3px 0 rgba(255, 106, 43, .85));
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .02em;
  line-height: 1.3;
  white-space: nowrap;
}

.brand__meta {
  max-height: 20px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--slate);
  white-space: nowrap;
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

[data-scrolled="true"] .brand__meta {
  max-height: 0;
  opacity: 0;
}

/* 频道切换 */
.channel-switch {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(10, 18, 48, .72);
}

.channel-switch__label {
  padding-inline: 7px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--slate);
  text-transform: uppercase;
}

.channel-switch__item {
  padding: 6px 12px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--slate);
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .06em;
  white-space: nowrap;
  transition: color 180ms var(--ease), background-color 180ms var(--ease), border-color 180ms var(--ease);
}
.channel-switch__item:hover {
  color: var(--cyan-mist);
  border-color: rgba(31, 224, 208, .38);
}
.channel-switch__item.is-active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-dark);
  font-weight: 800;
  box-shadow: 3px 3px 0 rgba(255, 106, 43, .7);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 10px 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(19, 28, 70, .8);
  color: var(--ice);
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  cursor: pointer;
  transition: border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); box-shadow: 4px 4px 0 rgba(31, 224, 208, .22); }

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
  height: 14px;
}
.nav-toggle__bars i {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--cyan);
  transition: transform 220ms var(--ease), opacity 220ms var(--ease), width 220ms var(--ease);
}
.nav-toggle__bars i:nth-child(2) { width: 62%; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; width: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 主导航层 */
.header-nav {
  position: relative;
  background: linear-gradient(90deg, var(--navy-3) 0%, var(--navy) 62%, rgba(107, 77, 255, .14) 100%);
  border-top: 1px solid rgba(127, 163, 255, .1);
}

.header-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-block: 0;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  list-style: none;
}

.nav-link {
  position: relative;
  display: block;
  padding: 14px 15px;
  color: var(--slate);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .1em;
  text-decoration: none;
  transition: color 180ms var(--ease), background-color 180ms var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 15px;
  right: 15px;
  bottom: 0;
  height: 3px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 220ms var(--ease);
}
.nav-link::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 50%;
  width: 5px;
  height: 5px;
  background: var(--orange);
  transform: translateY(-50%) rotate(45deg) scale(0);
  transition: transform 220ms var(--ease);
}
.nav-link:hover { color: var(--ice); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--ice); font-weight: 800; }
.nav-link[aria-current="page"]::after { transform: scaleX(1); background: var(--orange); }
.nav-link[aria-current="page"]::before { transform: translateY(-50%) rotate(45deg) scale(1); }

.header-nav__hint {
  margin: 0;
  padding-right: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--slate);
  white-space: nowrap;
}

/* 阅读进度轨 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  background: rgba(127, 163, 255, .14);
  overflow: hidden;
}
.scroll-progress__fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--violet) 58%, var(--orange) 100%);
  transition: width 120ms linear;
}

/* 移动端底部快捷条 */
.mobile-dock {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  gap: 4px;
  padding: 7px 9px calc(7px + env(safe-area-inset-bottom, 0px));
  background: linear-gradient(180deg, rgba(10, 18, 48, .9), var(--navy) 62%);
  border-top: 1px solid rgba(31, 224, 208, .34);
  backdrop-filter: blur(6px);
}

.mobile-dock__primary {
  flex: 1 1 40%;
  display: grid;
  place-items: center;
  padding: 12px 10px;
  background: var(--orange);
  color: #1B0700;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .1em;
  box-shadow: 4px 4px 0 rgba(31, 224, 208, .35);
}
.mobile-dock__primary:hover { color: #1B0700; }

.mobile-dock__item {
  flex: 1 1 auto;
  display: grid;
  place-items: center;
  padding: 12px 6px;
  border: 1px solid rgba(127, 163, 255, .2);
  background: rgba(19, 28, 70, .7);
  color: var(--slate);
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  transition: color 160ms var(--ease), background-color 160ms var(--ease);
}
.mobile-dock__item:hover { color: var(--ice); background: var(--navy-2); }

/* ==========================================================================
   页脚
   ========================================================================== */

.site-footer {
  margin-top: clamp(40px, 7vw, 96px);
  background: linear-gradient(180deg, rgba(19, 28, 70, .55) 0%, var(--navy-deep) 42%);
  border-top: 1px solid rgba(31, 224, 208, .24);
}

.footer-band {
  display: flex;
  height: 6px;
}
.footer-band span { flex: 1 1 0; }
.footer-band span:nth-child(1) { background: var(--cyan); }
.footer-band span:nth-child(2) { background: var(--violet); }
.footer-band span:nth-child(3) { background: var(--orange); }

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.35fr);
  gap: clamp(28px, 5vw, 64px);
  padding-block: clamp(34px, 6vw, 62px);
}

.footer-brand { display: flex; flex-direction: column; gap: 16px; }
.brand--footer .brand__mark { filter: drop-shadow(3px 3px 0 rgba(31, 224, 208, .55)); }

.footer-lead {
  margin: 0;
  max-width: 46ch;
  color: #AEBBDE;
  font-size: 14px;
  line-height: 1.78;
}

.footer-contact {
  display: grid;
  gap: 1px;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(127, 163, 255, .14);
  overflow: hidden;
}
.footer-contact__row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 12px;
  padding: 10px 13px;
  background: rgba(10, 18, 48, .94);
}
.footer-contact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--slate);
}
.footer-contact dd {
  margin: 0;
  font-size: 13.5px;
  color: var(--ice);
  word-break: break-all;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 30px);
}

.footer-col { display: flex; flex-direction: column; gap: 12px; }

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-col__title::after {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  margin-top: 8px;
  background: rgba(31, 224, 208, .5);
}

.footer-col__list { list-style: none; display: grid; gap: 9px; }

.footer-col__link {
  display: inline-block;
  color: #C3CFEC;
  font-size: 14px;
  text-decoration: none;
  transition: color 180ms var(--ease), transform 180ms var(--ease);
}
.footer-col__link:hover { color: var(--cyan); transform: translateX(4px); }

.footer-note {
  padding-bottom: clamp(18px, 3vw, 28px);
}
.footer-note p {
  margin: 0;
  max-width: 78ch;
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px dashed rgba(127, 163, 255, .22);
  color: var(--slate);
  font-size: 12.5px;
  line-height: 1.8;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
  padding-block: 16px calc(22px + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(31, 224, 208, .08), rgba(10, 18, 48, 0) 45%);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--slate);
}
.footer-legal p { margin: 0; }
.footer-legal__icp { color: var(--cyan-mist); }
.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  list-style: none;
  margin-left: auto;
}
.footer-legal__links a { color: var(--slate); }
.footer-legal__links a:hover { color: var(--cyan); }

/* ==========================================================================
   通用内容组件
   ========================================================================== */

/* 卡片 */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--navy-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 3px;
  background: var(--cyan);
  transition: width var(--dur) var(--ease);
}
.card::after {
  content: "";
  position: absolute;
  top: 11px;
  right: 11px;
  width: 28px;
  height: 12px;
  opacity: 0;
  transform: translateX(8px);
  pointer-events: none;
  background-image: linear-gradient(90deg,
    transparent 0 3px, var(--cyan) 3px 4px,
    transparent 4px 8px, var(--cyan) 8px 9px,
    transparent 9px 13px, var(--cyan) 13px 14px,
    transparent 14px 18px, var(--cyan) 18px 19px,
    transparent 19px 23px, var(--cyan) 23px 24px,
    transparent 24px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hard-hover);
  border-color: rgba(31, 224, 208, .48);
}
.card:hover::before { width: 100%; }
.card:hover::after { opacity: .9; transform: translateX(0); }

.card__title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.36;
}
.card__text { margin: 0; color: #B7C4E4; font-size: 14.5px; line-height: 1.72; }
.card__foot {
  margin-top: auto;
  padding-top: 13px;
  border-top: 1px dashed rgba(127, 163, 255, .24);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

/* 网格 */
.grid { display: grid; gap: clamp(14px, 2vw, 22px); }
.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--auto { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* 色带 */
.band {
  position: relative;
  padding-block: clamp(26px, 4vw, 46px);
  background: linear-gradient(90deg, var(--navy-2) 0%, var(--navy-3) 52%, var(--navy) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.band--cyan {
  background: linear-gradient(90deg, rgba(31, 224, 208, .18) 0%, rgba(19, 28, 70, .9) 46%, var(--navy) 100%);
  border-color: rgba(31, 224, 208, .3);
}
.band--violet {
  background: linear-gradient(90deg, rgba(107, 77, 255, .24) 0%, rgba(19, 28, 70, .9) 46%, var(--navy) 100%);
  border-color: rgba(107, 77, 255, .34);
}
.band--orange {
  background: linear-gradient(90deg, rgba(255, 106, 43, .18) 0%, rgba(19, 28, 70, .9) 46%, var(--navy) 100%);
  border-color: rgba(255, 106, 43, .3);
}

/* 长卷章节 */
.chapter { display: grid; gap: clamp(14px, 2.6vw, 30px); grid-template-columns: minmax(0, 1fr); }
.chapter__index {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.6vw, 52px);
  font-weight: 700;
  line-height: .92;
  letter-spacing: -.02em;
  color: rgba(31, 224, 208, .22);
  -webkit-text-stroke: 1px rgba(31, 224, 208, .6);
}
.chapter__body { min-width: 0; }

/* 数据 */
.stat { display: flex; flex-direction: column; gap: 5px; }
.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ice);
}
.stat__value--accent { color: var(--orange); }
.stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--slate);
}

/* 编号矩阵 */
.matrix {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1px;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}
.matrix__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  background: var(--navy);
  color: inherit;
  text-decoration: none;
  transition: background-color 200ms var(--ease);
}
.matrix__cell:hover { background: var(--navy-2); color: inherit; }
.matrix__cell-title {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .01em;
}
.matrix__cell-text { font-size: 12.5px; color: var(--slate); line-height: 1.7; }

/* 图片容器（页面阶段放置图片占位） */
.figure { margin: 0; }
.figure__frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid rgba(127, 163, 255, .24);
  border-radius: var(--radius);
  background: linear-gradient(135deg, #16224F 0%, #0A1230 70%);
}
.figure__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(127, 163, 255, .13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(127, 163, 255, .13) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: .75;
}
.figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background: linear-gradient(160deg, rgba(31, 224, 208, .5) 0%, rgba(10, 18, 48, .06) 48%, rgba(107, 77, 255, .55) 100%);
  mix-blend-mode: multiply;
}
.figure__frame img,
.figure__frame svg {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure__frame--slant {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}
.figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--slate);
}
.figure--wide .figure__frame { aspect-ratio: 21 / 9; }
.figure--tall .figure__frame { aspect-ratio: 3 / 4; }
.figure--square .figure__frame { aspect-ratio: 1 / 1; }

/* 面包屑 */
.breadcrumbs {
  padding-top: clamp(16px, 2.4vw, 26px);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--slate);
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
}
.breadcrumbs li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs li + li::before {
  content: "/";
  color: rgba(138, 151, 190, .55);
}
.breadcrumbs a { color: var(--slate); }
.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs [aria-current="page"] { color: var(--ice); }

/* 滚动显现协议 */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
.has-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ==========================================================================
   响应式
   ========================================================================== */

@media (max-width: 1120px) {
  .nav-link { padding-inline: 11px; font-size: 12.5px; }
  .nav-link::after { left: 11px; right: 11px; }
  .header-actions .btn--ghost { display: none; }
}

@media (max-width: 1000px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 960px) {
  body { padding-bottom: 84px; }

  .channel-switch,
  .header-actions { display: none; }

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

  .header-utility__inner { padding-block: 11px; }

  .header-nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height 340ms var(--ease);
  }
  .header-nav[data-open="true"] {
    max-height: 74vh;
    overflow-y: auto;
  }

  .header-nav__inner {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: 4px 16px;
  }

  .nav-list { flex-direction: column; align-items: stretch; }
  .nav-list > li { border-top: 1px solid rgba(127, 163, 255, .16); }
  .nav-link {
    padding: 15px 6px;
    font-size: 15px;
    letter-spacing: .06em;
  }
  .nav-link::after { left: 6px; right: 6px; }
  .nav-link::before { left: 0; }

  .header-nav__hint {
    padding: 14px 6px 0;
    white-space: normal;
    line-height: 1.7;
  }

  .mobile-dock { display: flex; }

  .scroll-progress { height: 2px; }
}

@media (max-width: 860px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .chapter { gap: 14px; }
}

@media (min-width: 900px) {
  .chapter { grid-template-columns: 108px minmax(0, 1fr); }
}

@media (max-width: 620px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .brand__meta { display: none; }

  .footer-nav { grid-template-columns: minmax(0, 1fr); }
  .footer-legal__links { margin-left: 0; width: 100%; }

  .footer-contact__row { grid-template-columns: minmax(0, 1fr); gap: 3px; }
}

@media (hover: none) {
  .card:active { background: var(--navy-3); transform: translateY(-2px); }
  .nav-link:active { background: rgba(31, 224, 208, .1); }
}

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

  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
  }

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

  .card:hover,
  .btn:hover { transform: none; }

  .scroll-progress__fill { transition: none; }

  .footer-col__link:hover { transform: none; }
}