/* ========== 飞亚体育 Site Kit / /assets/site.css ========== */

/* ---------- 变量 ---------- */
:root {
  --c-bg: #0A1A3A;
  --c-bg-alt: #0F2445;
  --c-bg-card: rgba(15, 36, 69, 0.62);
  --c-accent: #FF6B1A;
  --c-accent-2: #C6FF00;
  --c-metal: #B0C4DE;
  --c-text: #F5F7FA;
  --c-text-dim: #9AA7B5;
  --c-field: #1D4ED8;
  --c-alert: #F59E0B;
  --c-border: #243B55;

  --font-display: 'Montserrat Black', 'Impact', 'Arial Black', sans-serif;
  --font-body: 'Microsoft YaHei', 'PingFang SC', sans-serif;
  --font-mono: 'SF Mono', 'Cascadia Mono', 'Consolas', monospace;

  --max-w: 1280px;
  --pad-x: clamp(1rem, 4vw, 2.5rem);
  --header-top: 28px;
  --header-bar: 72px;
  --header-h: calc(var(--header-top) + var(--header-bar));
  --trans: 200ms ease;
  --radius: 6px;

  --z-header: 900;
  --z-nav: 950;
  --z-skip: 2000;
  --z-progress: 960;
}

@media (max-width: 767px) {
  :root {
    --header-top: 24px;
    --header-bar: 60px;
  }
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  min-height: 100vh;
  padding-top: var(--header-h);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 900;
  color: var(--c-text);
  line-height: 1.2;
}

a {
  color: var(--c-metal);
  text-decoration: none;
  transition: color var(--trans), border-color var(--trans);
}

a:hover {
  color: var(--c-accent);
}

ul,
ol {
  list-style: none;
}

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

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
}

button {
  cursor: pointer;
}

hr {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: 2rem 0;
}

::selection {
  background: rgba(255, 107, 26, 0.35);
  color: var(--c-text);
}

/* ---------- 可访问性 ---------- */
:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
  border-radius: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -3rem;
  left: 1rem;
  z-index: var(--z-skip);
  background: var(--c-accent);
  color: var(--c-bg);
  font-weight: 700;
  font-size: 0.875rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius);
  transition: top var(--trans), background var(--trans);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 0.75rem;
  outline: none;
  background: var(--c-accent-2);
  color: var(--c-bg);
}

/* ---------- 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: var(--c-bg);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow var(--trans);
}

.site-header[data-scrolled] {
  box-shadow: 0 10px 32px rgba(2, 6, 18, 0.45);
}

.site-header__topline {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  height: var(--header-top);
  padding: 0 var(--pad-x);
  background: var(--c-bg-alt);
  border-bottom: 1px solid var(--c-border);
  font-family: var(--font-mono);
  font-size: 0.6563rem;
  letter-spacing: 0.08em;
  color: var(--c-text-dim);
  white-space: nowrap;
}

.console-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-accent-2);
  box-shadow: 0 0 8px rgba(198, 255, 0, 0.6);
  flex-shrink: 0;
}

.topline__ticks {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  margin-left: auto;
  height: 55%;
}

.scale-tick {
  display: block;
  width: 1px;
  height: 12px;
  background: var(--c-metal);
  opacity: 0.35;
  border-radius: 1px;
}

.scale-tick:nth-child(2n) {
  height: 8px;
}

.scale-tick:nth-child(3n) {
  height: 16px;
  opacity: 0.7;
}

.topline__path {
  color: var(--c-accent-2);
  margin-left: 0.75rem;
}

.topline__ver {
  color: var(--c-accent);
  font-weight: 700;
  padding: 2px 8px;
  border: 1px solid rgba(255, 107, 26, 0.35);
  border-radius: 3px;
  font-size: 0.5625rem;
  line-height: 1;
}

.site-header__bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  height: var(--header-bar);
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
  color: var(--c-text);
}

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

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent) 55%, var(--c-field) 100%);
  color: var(--c-text);
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 900;
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
  letter-spacing: -0.02em;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
}

.brand__mark-slash {
  position: absolute;
  top: -10%;
  right: 30%;
  width: 6px;
  height: 120%;
  background: rgba(255, 255, 255, 0.18);
  transform: skewX(-18deg);
}

.brand__text {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1;
}

/* 导航：移动端默认隐藏，展开为抽屉 */
.site-nav {
  display: none;
}

.site-nav[data-open] {
  display: flex;
  flex-direction: column;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  max-height: calc(100vh - var(--header-h));
  overflow-y: auto;
  background: var(--c-bg-alt);
  border-top: 1px solid var(--c-border);
  padding: 1.5rem var(--pad-x) 2rem;
  z-index: var(--z-nav);
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.site-nav__item {
  border-bottom: 1px solid rgba(36, 59, 85, 0.55);
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  width: 100%;
  padding: 0.8125rem 0.375rem;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--c-text-dim);
  position: relative;
  transition: color var(--trans), background var(--trans);
}

.site-nav__link:hover {
  color: var(--c-accent);
  background: rgba(255, 107, 26, 0.04);
}

.site-nav__link[aria-current="page"] {
  color: var(--c-accent-2);
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--c-metal);
  opacity: 0.65;
  letter-spacing: 0.06em;
  min-width: 1.5rem;
}

.site-nav__link[aria-current="page"] .site-nav__index {
  color: var(--c-accent);
  opacity: 1;
}

.site-nav__utility {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--c-border);
}

.site-nav__utility-link {
  display: block;
  padding: 0.75rem 0.375rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-metal);
}

.site-nav__utility-link:hover {
  color: var(--c-accent);
}

/* 搜索图标 */
.header-search {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  position: relative;
  flex-shrink: 0;
  transition: border-color var(--trans);
}

.header-search::before {
  content: '';
  width: 13px;
  height: 13px;
  border: 2px solid var(--c-metal);
  border-radius: 50%;
  transform: translateX(-3px);
  transition: border-color var(--trans);
}

.header-search::after {
  content: '';
  position: absolute;
  right: 10px;
  bottom: 11px;
  width: 8px;
  height: 2px;
  background: var(--c-metal);
  transform: rotate(45deg);
  transition: background var(--trans);
}

.header-search:hover {
  border-color: var(--c-accent);
}

.header-search:hover::before {
  border-color: var(--c-accent);
}

.header-search:hover::after {
  background: var(--c-accent);
}

/* 汉堡按钮 */
.header-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-bg-alt);
  flex-shrink: 0;
  transition: border-color var(--trans), background var(--trans);
}

.header-toggle:hover {
  border-color: var(--c-accent);
}

.header-toggle__line {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-metal);
  transition: transform var(--trans), opacity var(--trans), background var(--trans);
}

.header-toggle[aria-expanded="true"] .header-toggle__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--c-accent);
}

.header-toggle[aria-expanded="true"] .header-toggle__line:nth-child(2) {
  opacity: 0;
}

.header-toggle[aria-expanded="true"] .header-toggle__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--c-accent);
}

/* 滚动进度条 */
.scroll-progress {
  position: absolute;
  bottom: -2px;
  left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-accent-2) 100%);
  z-index: var(--z-progress);
  pointer-events: none;
  border-radius: 0 2px 2px 0;
  transition: width 80ms linear;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--c-bg);
  border-top: 1px solid var(--c-border);
  margin-top: 4rem;
}

.site-footer__cut {
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent) 0, var(--c-accent) 64px, var(--c-border) 64px, var(--c-border) 100%);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3rem var(--pad-x) 2.5rem;
}

.site-footer__brand .brand {
  margin-bottom: 1.25rem;
}

.site-footer__desc {
  color: var(--c-text-dim);
  font-size: 0.9375rem;
  max-width: 30ch;
  margin-bottom: 1.5rem;
}

.site-footer__trust {
  font-size: 0.8125rem;
  color: var(--c-metal);
  border-left: 3px solid var(--c-accent);
  padding-left: 1rem;
  line-height: 1.75;
  max-width: 36ch;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.7188rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--c-metal);
  font-weight: 400;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--c-border);
}

.footer-heading--sub {
  margin-top: 2rem;
  border-bottom: none;
  padding-bottom: 0;
}

.footer-links li {
  margin-bottom: 0.625rem;
}

.footer-links a {
  color: var(--c-text-dim);
  font-size: 0.9375rem;
  transition: color var(--trans);
}

.footer-links a:hover {
  color: var(--c-accent);
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  margin-bottom: 0.625rem;
  color: var(--c-text-dim);
  font-size: 0.9375rem;
}

.footer-contact li::before {
  content: '';
  flex-shrink: 0;
  width: 4px;
  height: 4px;
  background: var(--c-accent);
  margin-top: 0.55em;
  border-radius: 1px;
}

.footer-contact a {
  color: var(--c-text-dim);
  word-break: break-all;
}

.footer-contact a:hover {
  color: var(--c-accent);
}

.site-footer__bottom {
  background: var(--c-bg-alt);
  border-top: 1px solid var(--c-border);
}

.site-footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1rem var(--pad-x);
  font-family: var(--font-mono);
  font-size: 0.7188rem;
  color: var(--c-text-dim);
}

.site-footer__bottom a {
  color: var(--c-text-dim);
  transition: color var(--trans);
}

.site-footer__bottom a:hover {
  color: var(--c-accent);
}

/* 页脚响应式 */
@media (min-width: 768px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 3rem 2rem;
  }

  .site-footer__brand {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .site-footer__inner {
    grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
    gap: 3rem;
  }

  .site-footer__brand {
    grid-column: auto;
  }
}

/* ---------- 布局容器 ---------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

#main-content {
  scroll-margin-top: calc(var(--header-h) + 1rem);
  outline: none;
}

/* ---------- 章节 ---------- */
.section {
  padding: clamp(3rem, 8vw, 5.5rem) var(--pad-x);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.section-head__id {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.2em;
  color: var(--c-accent);
  margin-bottom: 0.375rem;
}

.section-head__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 3.25rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.section-head__note {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.3em;
  color: var(--c-text-dim);
  text-transform: uppercase;
  max-height: 80px;
}

/* ---------- 页面标题区 ---------- */
.page-head {
  position: relative;
  padding: clamp(2.5rem, 7vw, 5rem) var(--pad-x) clamp(2rem, 5vw, 3.5rem);
  background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg-alt) 100%);
  border-bottom: 1px solid var(--c-border);
  overflow: hidden;
}

.page-head::after {
  content: '';
  position: absolute;
  top: -40px;
  right: -20px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(255, 107, 26, 0.14) 0%, transparent 68%);
  pointer-events: none;
}

.page-head__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  position: relative;
  z-index: 1;
}

.page-head__content {
  flex: 1;
  min-width: 0;
}

.page-head__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7188rem;
  letter-spacing: 0.15em;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 0.875rem;
}

.page-head__kicker::before {
  content: '';
  width: 16px;
  height: 2px;
  background: var(--c-accent);
}

.page-head__title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 6vw, 4.75rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.page-head__desc {
  margin-top: 1.125rem;
  max-width: 40ch;
  color: var(--c-text-dim);
  font-size: 1.0625rem;
}

.page-head__meta {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.3em;
  color: var(--c-metal);
  text-transform: uppercase;
  white-space: nowrap;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  min-height: 44px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 700;
  cursor: pointer;
  text-align: center;
  transition: background var(--trans), color var(--trans), border-color var(--trans), box-shadow var(--trans), transform var(--trans);
}

.btn--accent {
  background: var(--c-accent);
  color: var(--c-bg);
}

.btn--accent:hover {
  color: var(--c-bg);
  box-shadow: 0 4px 16px rgba(255, 107, 26, 0.35);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  border-color: var(--c-border);
  color: var(--c-text);
}

.btn--ghost:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.btn--volt {
  background: var(--c-accent-2);
  color: var(--c-bg);
}

.btn--volt:hover {
  color: var(--c-bg);
  box-shadow: 0 4px 16px rgba(198, 255, 0, 0.25);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.875rem 0;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--c-border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-text-dim);
}

.breadcrumb__link {
  color: var(--c-text-dim);
}

.breadcrumb__link:hover {
  color: var(--c-accent);
}

.breadcrumb__sep {
  color: var(--c-border);
  user-select: none;
}

.breadcrumb__current {
  color: var(--c-text);
}

/* ---------- 栅格 ---------- */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid--2,
.grid--3,
.grid--4 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  overflow: hidden;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--trans), transform var(--trans), background var(--trans);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: var(--c-accent);
  transition: height var(--trans);
}

.card--link {
  display: block;
  color: inherit;
}

.card--link:hover {
  color: inherit;
  border-color: var(--c-accent);
  transform: translateY(-3px);
}

.card--link:hover::before {
  height: 100%;
}

.card__meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-dim);
  margin-bottom: 0.75rem;
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-bottom: 0.625rem;
}

.card--link:hover .card__title {
  color: var(--c-accent);
}

.card__body {
  font-size: 0.9375rem;
  color: var(--c-text-dim);
  line-height: 1.7;
}

/* ---------- 图像容器 ---------- */
.img-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(145deg, var(--c-bg-alt) 0%, var(--c-bg) 100%);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
}

.img-frame::before {
  content: '';
  display: block;
  padding-top: 56.25%;
}

.img-frame--portrait::before {
  padding-top: 125%;
}

.img-frame--square::before {
  padding-top: 100%;
}

.img-frame > img,
.img-frame > video,
.img-frame > canvas,
.img-frame > picture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 107, 26, 0.06) 0%, transparent 45%);
  pointer-events: none;
}

/* ---------- 状态胶囊 ---------- */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3125rem 0.875rem;
  border-radius: 999px;
  border: 1px solid var(--c-border);
  background: var(--c-bg-alt);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-metal);
  white-space: nowrap;
}

.status-pill::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}

.status-pill--live {
  color: var(--c-accent-2);
  border-color: rgba(198, 255, 0, 0.3);
}

.status-pill--live::before {
  box-shadow: 0 0 6px rgba(198, 255, 0, 0.55);
}

.status-pill--warn {
  color: var(--c-alert);
  border-color: rgba(245, 158, 11, 0.35);
}

.status-pill--outline {
  background: transparent;
}

/* ---------- 装饰元素 ---------- */
.exhibit-note {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-text-dim);
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 26, 0.12) 0%, transparent 65%);
  pointer-events: none;
}

.glow-orb--volt {
  background: radial-gradient(circle, rgba(198, 255, 0, 0.1) 0%, transparent 65%);
}

.diag-line {
  position: absolute;
  pointer-events: none;
  background: linear-gradient(135deg, transparent 48%, var(--c-border) 49%, var(--c-border) 51%, transparent 52%);
}

.callout {
  background: rgba(29, 78, 216, 0.12);
  border: 1px solid rgba(29, 78, 216, 0.3);
  border-radius: var(--radius);
  padding: 1.5rem;
  color: var(--c-text);
}

.callout__title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: var(--c-metal);
}

.callout p {
  color: var(--c-text-dim);
  font-size: 0.9375rem;
}

/* ---------- 桌面端导航 · 960px 起 ---------- */
@media (min-width: 960px) {
  .site-nav,
  .site-nav[data-open] {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
    flex: 1;
    position: static;
    max-height: none;
    overflow: visible;
    background: transparent;
    border-top: none;
    padding: 0;
    z-index: auto;
  }

  .site-nav__list {
    flex-direction: row;
    align-items: center;
    gap: 0.25rem;
  }

  .site-nav__item {
    border-bottom: none;
  }

  .site-nav__link {
    width: auto;
    padding: 0.5rem 0.75rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--c-text-dim);
    background: transparent;
    white-space: nowrap;
  }

  .site-nav__link::after {
    content: '';
    position: absolute;
    left: 0.75rem;
    right: 0.75rem;
    bottom: 0.125rem;
    height: 2px;
    background: var(--c-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--trans);
    border-radius: 2px;
  }

  .site-nav__link:hover {
    color: var(--c-text);
    background: transparent;
  }

  .site-nav__link:hover::after {
    transform: scaleX(1);
  }

  .site-nav__link[aria-current="page"] {
    color: var(--c-text);
  }

  .site-nav__link[aria-current="page"]::after {
    transform: scaleX(1);
  }

  .site-nav__link[aria-current="page"] .site-nav__index {
    color: var(--c-accent);
  }

  .site-nav__utility {
    display: none;
  }

  .header-toggle {
    display: none;
  }

  .page-head__meta {
    display: block;
  }
}

/* ---------- 移动端微调 ---------- */
@media (max-width: 767px) {
  .topline__label,
  .topline__ticks {
    display: none;
  }

  .brand__mark {
    width: 36px;
    height: 36px;
    font-size: 0.75rem;
  }

  .brand__text {
    font-size: 1.125rem;
  }

  .header-search,
  .header-toggle {
    width: 38px;
    height: 38px;
  }

  .page-head__meta {
    display: none;
  }

  .site-footer__inner {
    padding-top: 2.5rem;
    gap: 2rem;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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

  .scroll-progress {
    transition: none;
  }
}