/* ============================================================
   KAIYUN 开云赛场 · /assets/site.css
   共享外壳：reset / tokens / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

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

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

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

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

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

button { font: inherit; color: inherit; }

a { color: inherit; }

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- tokens ---------- */
:root {
  /* 色彩 */
  --ink-0: #050D1F;
  --ink-1: #0A1B3D;
  --ink-2: #17345F;
  --cyan: #35F2E3;
  --orange: #FF6A2B;
  --violet: #8B5CF6;
  --white: #F5F9FF;
  --fog: #A8B9D8;
  --green: #4DE1A0;
  --amber: #FFC857;

  /* 字体 */
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: var(--font-display);
  --font-mono: ui-monospace, "JetBrains Mono", "IBM Plex Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  /* 度量 */
  --shell: 1280px;
  --gutter: clamp(16px, 4vw, 40px);
  --cut: 14px;
  --cut-lg: 20px;
  --radius: 8px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t: 340ms;
  --section-gap: clamp(64px, 8vw, 128px);
}

/* ---------- base typography ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-0);
  background-image: radial-gradient(120% 60% at 50% -10%, rgba(53, 242, 227, 0.10), transparent 62%);
  background-repeat: no-repeat;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--white);
}

h1 { font-size: clamp(34px, 5.2vw, 64px); letter-spacing: 0.06em; }
h2 { font-size: clamp(26px, 3.4vw, 42px); }
h3 { font-size: clamp(19px, 2vw, 24px); }
h4 { font-size: clamp(16px, 1.6vw, 19px); letter-spacing: 0.08em; }

p { max-width: 42ch; }

::selection {
  background: var(--cyan);
  color: var(--ink-0);
}

/* ---------- shell / layout helpers ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section-gap); }
.section--tight { padding-block: clamp(40px, 5vw, 72px); }

.grid-2 {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
}

.grid-3 {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
}

.u-mono { font-family: var(--font-mono); letter-spacing: 0.02em; }
.u-center { text-align: center; }

/* ---------- text components ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--cyan);
}

.section-title {
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 900;
  letter-spacing: 0.05em;
  line-height: 1.22;
}

.lede {
  max-width: 40ch;
  color: var(--fog);
  font-size: clamp(16px, 1.15vw, 18px);
  line-height: 1.75;
}

.prose {
  max-width: 42ch;
  color: var(--fog);
  line-height: 1.8;
}

.prose p + p { margin-top: 14px; }

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--cyan), rgba(139, 92, 246, 0.55) 42%, transparent 92%);
  opacity: 0.7;
}

.data-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--white);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 200ms var(--ease), background-color 200ms, border-color 200ms, color 200ms;
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--orange);
  color: #12060B;
  box-shadow: 0 12px 28px -16px rgba(255, 106, 43, 0.9);
}

.btn--primary:hover { background: #FF7F49; }

.btn--ghost {
  background: transparent;
  color: var(--cyan);
  border-color: rgba(53, 242, 227, 0.55);
}

.btn--ghost:hover {
  background: rgba(53, 242, 227, 0.10);
  border-color: var(--cyan);
}

.btn--quiet {
  background: transparent;
  color: var(--fog);
  border-color: var(--ink-2);
}

.btn--quiet:hover {
  color: var(--white);
  border-color: rgba(168, 185, 216, 0.6);
}

/* ---------- panel / card / tag ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 2.4vw, 28px);
  background: linear-gradient(155deg, rgba(10, 27, 61, 0.96), rgba(7, 21, 50, 0.92));
  border: 1px solid var(--ink-2);
  clip-path: polygon(0 0, calc(100% - var(--cut-lg)) 0, 100% var(--cut-lg), 100% 100%, var(--cut-lg) 100%, 0 calc(100% - var(--cut-lg)));
}

.panel--flat { background: var(--ink-1); }

.card {
  position: relative;
  display: block;
  padding: clamp(20px, 2.4vw, 26px);
  background: linear-gradient(160deg, rgba(10, 27, 61, 0.94), rgba(5, 13, 31, 0.94));
  border: 1px solid var(--ink-2);
  border-radius: 6px;
  color: inherit;
  text-decoration: none;
  transition: transform 220ms var(--ease), border-color 220ms, box-shadow 220ms;
}

.card:hover,
.card:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(53, 242, 227, 0.75);
  box-shadow: 0 22px 46px -30px rgba(53, 242, 227, 0.55);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.6;
  white-space: nowrap;
}

.tag--cyan { color: var(--cyan); }
.tag--violet { color: var(--violet); }
.tag--orange { color: var(--orange); }
.tag--green { color: var(--green); }
.tag--amber { color: var(--amber); }

/* ---------- breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--fog);
}

.breadcrumb__link {
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms, border-color 160ms;
}

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

.breadcrumb > * + *::before {
  content: "/";
  margin-right: 8px;
  color: var(--ink-2);
}

/* ---------- media frame（页面阶段放图用） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: linear-gradient(150deg, var(--ink-1), #06122A);
  border: 1px solid var(--ink-2);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.media-frame img,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

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

.media-frame__scan {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(5, 13, 31, 0.30) 0 2px, transparent 2px 5px);
  opacity: 0.55;
}

.media-fallback {
  display: grid;
  place-content: center;
  gap: 6px;
  width: 100%;
  height: 100%;
  min-height: 160px;
  padding: 18px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--fog);
  background-image: repeating-linear-gradient(135deg, rgba(23, 52, 95, 0.55) 0 1px, transparent 1px 12px);
}

/* ---------- scroll progress（JS 注入） ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 120;
  pointer-events: none;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 55%, var(--orange));
  transform: scaleX(0);
  transform-origin: 0 50%;
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: relative;
  z-index: 60;
  background: linear-gradient(180deg, #061026 0%, var(--ink-1) 66%, #071532 100%);
  border-bottom: 1px solid var(--ink-2);
  box-shadow: 0 30px 70px -48px rgba(0, 0, 0, 0.95);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image: repeating-linear-gradient(90deg, rgba(23, 52, 95, 0.55) 0 1px, transparent 1px 86px);
}

.hdr-strip,
.masthead,
.mainnav,
.entry-band {
  position: relative;
  z-index: 1;
}

/* skip link */
.skip-link {
  position: absolute;
  left: 50%;
  top: 10px;
  z-index: 99;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--cyan);
  color: #04101F;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  transform: translate(-50%, -180%);
  transition: transform 200ms var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
  outline-offset: 2px;
}

/* 实时状态带 */
.hdr-strip {
  background: rgba(5, 13, 31, 0.66);
  border-bottom: 1px solid rgba(23, 52, 95, 0.85);
}

.hdr-strip__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 38px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--fog);
}

.hdr-live {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  max-width: none;
  white-space: nowrap;
}

.hdr-live__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  animation: hdr-pulse 2.6s ease-out infinite;
}

@keyframes hdr-pulse {
  0% { box-shadow: 0 0 0 0 rgba(77, 225, 160, 0.55); }
  70% { box-shadow: 0 0 0 9px rgba(77, 225, 160, 0); }
  100% { box-shadow: 0 0 0 0 rgba(77, 225, 160, 0); }
}

.hdr-utility {
  display: flex;
  align-items: center;
  gap: 20px;
}

.hdr-utility__link {
  color: var(--fog);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 160ms, border-color 160ms;
}

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

/* 刊头 */
.masthead {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-block: clamp(18px, 2.4vw, 26px) clamp(14px, 2vw, 20px);
  text-align: center;
}

.masthead__wrap {
  display: grid;
  justify-items: center;
  gap: 4px;
}

.masthead__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--cyan);
  max-width: none;
}

.masthead__brand {
  display: inline-block;
  padding-inline: 6px;
  font-family: var(--font-display);
  font-size: clamp(28px, 4.6vw, 46px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: 0.14em;
  color: var(--white);
  text-decoration: none;
  transition: color 200ms, text-shadow 200ms;
}

.masthead__brand::before,
.masthead__brand::after {
  content: "";
  display: inline-block;
  width: 24px;
  height: 2px;
  vertical-align: middle;
  margin-inline: 14px;
  background: var(--cyan);
  transform: skewY(-18deg) translateY(-4px);
  opacity: 0.8;
}

.masthead__brand:hover,
.masthead__brand:focus-visible {
  color: var(--cyan);
  text-shadow: 0 0 26px rgba(53, 242, 227, 0.45);
}

.masthead__tagline {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--fog);
  max-width: none;
}

/* 移动端开关 */
.nav-toggle {
  position: absolute;
  right: var(--gutter);
  top: 50%;
  transform: translateY(-50%);
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(5, 13, 31, 0.7);
  border: 1px solid var(--ink-2);
  border-radius: var(--radius);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  cursor: pointer;
  transition: border-color 180ms, color 180ms;
}

.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: var(--cyan);
  transition: transform 220ms var(--ease), opacity 160ms linear;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) 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(-6px) rotate(-45deg); }

/* 主栏目导航 */
.mainnav {
  background: rgba(5, 13, 31, 0.42);
  border-top: 1px solid var(--ink-2);
  border-bottom: 1px solid var(--ink-2);
}

.mainnav__inner { display: block; }

.mainnav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(4px, 1.8vw, 26px);
}

.mainnav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 14px 8px;
  color: var(--fog);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-decoration: none;
  transition: color 200ms;
}

.mainnav__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: rgba(168, 185, 216, 0.45);
  transition: color 200ms;
}

.mainnav__link::after {
  content: "";
  position: absolute;
  left: 6px;
  right: 6px;
  bottom: 5px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 260ms var(--ease);
}

.mainnav__link:hover,
.mainnav__link:focus-visible { color: var(--white); }

.mainnav__link:hover::after,
.mainnav__link:focus-visible::after,
.mainnav__link[aria-current="page"]::after { transform: scaleX(1); }

.mainnav__link[aria-current="page"] { color: var(--white); }
.mainnav__link[aria-current="page"] .mainnav__idx { color: var(--cyan); }

/* 赛事入口带 */
.entry-band {
  background: linear-gradient(90deg, rgba(10, 27, 61, 0.92), rgba(5, 13, 31, 0.55));
}

.entry-band__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 22px);
  min-height: 50px;
}

.entry-band__label {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--fog);
  white-space: nowrap;
  max-width: none;
}

.entry-band__label::before {
  content: "";
  width: 20px;
  height: 1px;
  background: var(--cyan);
}

.entry-band__list {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1 1 auto;
  overflow-x: auto;
  padding-block: 8px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.entry-band__list::-webkit-scrollbar { display: none; }

.entry-chip {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-decoration: none;
  color: var(--white);
  background: rgba(23, 52, 95, 0.55);
  border: 1px solid var(--ink-2);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: background-color 180ms, border-color 180ms, color 180ms;
}

.entry-chip:hover,
.entry-chip:focus-visible {
  background: rgba(53, 242, 227, 0.14);
  border-color: var(--cyan);
  color: var(--cyan);
}

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

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: clamp(72px, 9vw, 120px);
  background: linear-gradient(180deg, #071532 0%, var(--ink-1) 46%, #040A18 100%);
  border-top: 1px solid var(--ink-2);
  color: var(--fog);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: -6%;
  right: -6%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--cyan) 28%, var(--violet) 62%, var(--orange) 86%, transparent);
  transform: skewY(-0.7deg);
  transform-origin: left center;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.7fr);
  gap: clamp(32px, 5vw, 72px);
  padding-block: clamp(44px, 6vw, 76px) clamp(32px, 4vw, 52px);
}

.footer-brand__link {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 900;
  letter-spacing: 0.14em;
  color: var(--white);
  text-decoration: none;
  transition: color 200ms;
}

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

.footer-brand__line {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  max-width: none;
}

.footer-brand__summary {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fog);
}

.footer-brand__version {
  margin-top: 18px;
  padding-left: 12px;
  max-width: 34ch;
  border-left: 2px solid var(--violet);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.04em;
  color: rgba(168, 185, 216, 0.9);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: clamp(22px, 3vw, 36px);
  align-content: start;
}

.footer-col__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--white);
}

.footer-col__title::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--cyan);
  transform: rotate(45deg);
}

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

.footer-col__link {
  position: relative;
  display: inline-block;
  font-size: 14px;
  color: var(--fog);
  text-decoration: none;
  transition: color 180ms, transform 180ms var(--ease);
}

.footer-col__link::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 1px;
  margin-right: 0;
  vertical-align: middle;
  background: var(--cyan);
  transition: width 200ms var(--ease), margin-right 200ms var(--ease);
}

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

.footer-col__link:hover::before,
.footer-col__link:focus-visible::before {
  width: 12px;
  margin-right: 7px;
}

.footer-contact { display: grid; gap: 12px; }

.footer-contact__row {
  display: grid;
  gap: 2px;
  font-size: 13px;
  line-height: 1.7;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: rgba(168, 185, 216, 0.65);
}

.footer-contact__value {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--white);
  overflow-wrap: anywhere;
}

.footer-contact__row--note .footer-contact__value {
  font-family: var(--font-body);
  font-size: 12px;
  line-height: 1.8;
  color: rgba(168, 185, 216, 0.85);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 20px 28px;
  border-top: 1px dashed rgba(23, 52, 95, 0.95);
}

.footer-legal {
  margin: 0;
  max-width: none;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: rgba(168, 185, 216, 0.85);
}

.footer-note {
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(168, 185, 216, 0.65);
}

/* ============================================================
   滚动显现
   ============================================================ */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 440ms var(--ease), transform 440ms var(--ease);
  transition-delay: calc(var(--i, 0) * 60ms);
  will-change: opacity, transform;
}

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

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1080px) {
  .footer-top { grid-template-columns: 1fr; }
  .footer-brand__summary,
  .footer-brand__version { max-width: 46ch; }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .masthead { padding-block: 16px 14px; }
  .masthead__brand::before,
  .masthead__brand::after { width: 14px; margin-inline: 9px; }

  .mainnav { background: rgba(5, 13, 31, 0.85); }
  .mainnav[data-nav] { display: none; }
  .mainnav[data-nav][data-open="true"] { display: block; }

  .mainnav__inner { padding-block: 6px; }

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

  .mainnav__link {
    width: 100%;
    justify-content: flex-start;
    padding: 14px 4px;
    font-size: 16px;
    letter-spacing: 0.08em;
    border-bottom: 1px dashed rgba(23, 52, 95, 0.9);
  }

  .mainnav__link::after { display: none; }

  .mainnav__link[aria-current="page"] {
    color: var(--cyan);
    box-shadow: inset 3px 0 0 var(--cyan);
    padding-left: 12px;
  }

  .entry-band__inner { min-height: 46px; }
}

@media (max-width: 760px) {
  .hdr-strip__inner { min-height: 34px; font-size: 10px; letter-spacing: 0.1em; }
  .hdr-utility { gap: 14px; }
  .hdr-live { gap: 7px; }

  .masthead__tagline { font-size: 11px; letter-spacing: 0.22em; }
  .masthead__kicker { font-size: 10px; letter-spacing: 0.32em; }

  .footer-top { padding-block: 38px 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-note { letter-spacing: 0.08em; }
}

@media (max-width: 420px) {
  .nav-toggle__label { display: none; }
  .nav-toggle { padding: 10px 12px; }
  .entry-band__label { display: none; }
  .masthead__brand::before,
  .masthead__brand::after { display: none; }
}

/* ============================================================
   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;
  }

  .hdr-live__dot { animation: none; }

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

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