/* =========================================================
   FB体育 / kuaijie-fb.com.cn
   共享样式层 · /assets/site.css
   深空灰 + 电光蓝 + 荧光绿 + 信号橙
   赛事数据直播台 · 刊头系统 · 玻璃数据卡 · 框景语言
   ========================================================= */

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

:root {
  --space-bg: #1B1E23;
  --space-bg-deep: #12151A;
  --electric-blue: #00D4FF;
  --neon-green: #39FF14;
  --signal-orange: #FF5A00;
  --moon-white: #E6E8EC;
  --cloud-gray: #9BA3AF;
  --glass-white: rgba(255, 255, 255, 0.12);
  --deep-sea-blue: #0B1460;

  --font-display: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif;
  --font-body: "Microsoft YaHei", "PingFang SC", "Source Han Sans SC", sans-serif;
  --font-mono: "Courier New", monospace;

  --container-max: 1200px;
  --container-pad: clamp(1rem, 4vw, 2rem);
  --radius: 4px;
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --speed: 0.28s;
  --header-offset: 96px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-offset);
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--moon-white);
  background-color: var(--space-bg);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
  background-size: 44px 44px;
}

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

a {
  color: var(--electric-blue);
  transition: color var(--speed) var(--ease);
}

a:hover {
  color: var(--neon-green);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: 0.04em;
  color: var(--moon-white);
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
}

h2 {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
}

h3 {
  font-size: 1.35rem;
}

h4 {
  font-size: 1.1rem;
}

p {
  margin: 0 0 1rem;
}

ul,
ol {
  padding-left: 1.25rem;
  margin: 0 0 1rem;
}

::selection {
  background: var(--electric-blue);
  color: var(--space-bg-deep);
}

:focus-visible {
  outline: 2px solid var(--electric-blue);
  outline-offset: 3px;
  border-radius: 2px;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--space-bg-deep);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--electric-blue), var(--deep-sea-blue));
  border-radius: 5px;
}

/* ---------- 布局工具 ---------- */

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

.section {
  padding: clamp(2.5rem, 7vw, 5rem) 0;
}

.section--tight {
  padding: clamp(1.5rem, 4vw, 2.4rem) 0;
}

.grid {
  display: grid;
  gap: clamp(1.2rem, 3vw, 1.8rem);
}

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

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

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

/* ---------- 无障碍 ---------- */

.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  transform: translateY(-120%);
  padding: 0.65rem 1.2rem;
  background: var(--electric-blue);
  color: var(--space-bg-deep);
  font-weight: 700;
  text-decoration: none;
  border-radius: 0 0 4px 0;
  transition: transform 0.2s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--neon-green);
  outline-offset: -2px;
}

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

#main-content {
  display: block;
  min-height: 60vh;
  scroll-margin-top: var(--header-offset);
}

/* ---------- 页头 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(18, 21, 26, 0.94);
  border-bottom: 1px solid rgba(0, 212, 255, 0.24);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.25);
  transition: box-shadow var(--speed) var(--ease);
}

@supports (backdrop-filter: blur(1px)) {
  .site-header {
    backdrop-filter: blur(10px);
  }
}

.site-header.is-compact {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5), 0 1px 0 rgba(0, 212, 255, 0.32);
}

.progress-track {
  position: relative;
  z-index: 4;
  height: 3px;
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
}

.progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--signal-orange) 0%, var(--electric-blue) 45%, var(--neon-green) 100%);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.6);
  transition: width 0.12s linear;
}

.masthead {
  position: relative;
  background:
    repeating-linear-gradient(115deg, transparent 0 16px, rgba(255, 255, 255, 0.024) 16px 17px),
    radial-gradient(ellipse 70% 130% at 50% -40%, rgba(0, 212, 255, 0.14), rgba(11, 20, 96, 0.28) 48%, transparent 80%);
}

.masthead-frame {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.frame-corner {
  position: absolute;
  width: 18px;
  height: 18px;
  pointer-events: none;
}

.frame-corner--tl {
  top: 2px;
  left: 2px;
  border-top: 3px solid var(--electric-blue);
  border-left: 3px solid var(--electric-blue);
}

.frame-corner--tr {
  top: 2px;
  right: 2px;
  border-top: 3px solid var(--neon-green);
  border-right: 3px solid var(--neon-green);
}

.frame-corner--bl {
  bottom: 2px;
  left: 2px;
  border-bottom: 3px solid var(--neon-green);
  border-left: 3px solid var(--neon-green);
}

.frame-corner--br {
  bottom: 2px;
  right: 2px;
  border-bottom: 3px solid var(--electric-blue);
  border-right: 3px solid var(--electric-blue);
}

.masthead-inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding-top: 1.15rem;
  padding-bottom: 1rem;
  transition: padding var(--speed) var(--ease);
}

.brand-block {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  color: inherit;
  text-decoration: none;
}

.brand-block:hover {
  color: inherit;
}

.brand-icon {
  display: grid;
  place-items: center;
  color: var(--electric-blue);
  filter: drop-shadow(0 0 6px rgba(0, 212, 255, 0.45));
  transition: color var(--speed) var(--ease);
}

.brand-block:hover .brand-icon {
  color: var(--neon-green);
}

.brand-svg {
  width: 44px;
  height: 44px;
  transition: width var(--speed) var(--ease), height var(--speed) var(--ease);
}

.brand-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.05;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 2.35rem;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--moon-white);
  text-shadow: 0 0 16px rgba(0, 212, 255, 0.25);
  transform: skewX(-5deg);
  transition: font-size var(--speed) var(--ease);
}

.brand-slogan {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  line-height: 1;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--neon-green);
}

.nav-toggle {
  display: none;
  position: absolute;
  right: calc(var(--container-pad) * 0.4);
  top: 50%;
  z-index: 3;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  background: transparent;
  cursor: pointer;
  transform: translateY(-50%);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--electric-blue);
}

.nav-toggle-bar {
  position: absolute;
  left: 50%;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--moon-white);
  transform: translateX(-50%);
  transition: top var(--speed) var(--ease), transform var(--speed) var(--ease), opacity var(--speed) var(--ease), background-color var(--speed) var(--ease);
}

.nav-toggle-bar--top {
  top: 13px;
}

.nav-toggle-bar--mid {
  top: 20px;
}

.nav-toggle-bar--bottom {
  top: 27px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar--top {
  top: 20px;
  transform: translateX(-50%) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar--mid {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar--bottom {
  top: 20px;
  transform: translateX(-50%) rotate(-45deg);
}

.site-nav {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  background: rgba(11, 20, 96, 0.16);
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(0.6rem, 2vw, 1.7rem);
  margin: 0;
  padding: 0 var(--container-pad);
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  position: relative;
  display: block;
  padding: 0.9rem 0.35rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.08em;
  color: var(--moon-white);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--speed) var(--ease);
}

.nav-link::before {
  content: attr(data-index) " /";
  margin-right: 0.28em;
  font-family: var(--font-mono);
  font-size: 0.68em;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--signal-orange);
  opacity: 0.9;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--electric-blue), var(--neon-green));
  transform: translateX(-50%);
  transition: width var(--speed) var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--electric-blue);
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  width: 100%;
}

.nav-link[aria-current="page"] {
  color: var(--electric-blue);
}

.nav-link[aria-current="page"]::before {
  color: var(--neon-green);
}

.nav-link[aria-current="page"]::after {
  width: 100%;
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
}

.site-header.is-compact .masthead-inner {
  padding-top: 0.55rem;
  padding-bottom: 0.5rem;
}

.site-header.is-compact .brand-svg {
  width: 32px;
  height: 32px;
}

.site-header.is-compact .brand-name {
  font-size: 1.45rem;
}

.site-header.is-compact .brand-slogan,
.site-header.is-compact .frame-corner--bl,
.site-header.is-compact .frame-corner--br {
  display: none;
}

.site-header.is-compact .nav-link {
  padding-top: 0.55rem;
  padding-bottom: 0.55rem;
}

/* ---------- 页脚 ---------- */

.site-footer {
  position: relative;
  background: linear-gradient(180deg, var(--space-bg) 0%, var(--space-bg-deep) 100%);
  border-top: 1px solid rgba(0, 212, 255, 0.18);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--signal-orange) 0%, var(--electric-blue) 40%, var(--deep-sea-blue) 70%, var(--neon-green) 100%);
  opacity: 0.9;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 2fr);
  gap: clamp(2rem, 5vw, 4rem);
  padding-top: clamp(2rem, 5vw, 3.5rem);
  padding-bottom: clamp(1.6rem, 4vw, 2.2rem);
}

.footer-brand-col {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem;
}

.footer-brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border: 2px solid currentColor;
  background: rgba(11, 20, 96, 0.4);
  color: var(--electric-blue);
  font-family: var(--font-display);
  font-size: 1.6rem;
  letter-spacing: 0.1em;
  transform: skewX(-8deg);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.25);
}

.footer-brand-text {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.7rem;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 1.9rem;
  letter-spacing: 0.05em;
  color: var(--moon-white);
  transform: skewX(-4deg);
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--neon-green);
}

.footer-trust {
  flex-basis: 100%;
  margin-top: 0.4rem;
  max-width: 34ch;
  color: var(--cloud-gray);
  font-size: 0.88rem;
  line-height: 1.75;
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1rem, 3vw, 2rem);
}

.footer-col {
  min-width: 0;
}

.footer-heading {
  margin-bottom: 0.7rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--signal-orange);
}

.footer-links {
  display: grid;
  gap: 0.12rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-block;
  padding: 0.3rem 0;
  color: var(--cloud-gray);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color var(--speed) var(--ease), transform var(--speed) var(--ease);
}

.footer-links a:hover {
  color: var(--electric-blue);
  transform: translateX(3px);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.5rem;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--cloud-gray);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
}

.footer-icp,
.footer-address {
  margin: 0;
  font-style: normal;
}

/* ---------- 通用内容组件 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.3rem;
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition: transform var(--speed) var(--ease), box-shadow var(--speed) var(--ease), border-color var(--speed) var(--ease), background-color var(--speed) var(--ease), color var(--speed) var(--ease);
}

.btn--primary {
  background: linear-gradient(135deg, var(--electric-blue) 0%, var(--deep-sea-blue) 130%);
  color: var(--space-bg-deep);
  font-weight: 700;
}

.btn--primary:hover {
  color: var(--space-bg-deep);
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(0, 212, 255, 0.3);
}

.btn--ghost {
  border-color: rgba(0, 212, 255, 0.55);
  color: var(--electric-blue);
  background: rgba(0, 212, 255, 0.06);
}

.btn--ghost:hover {
  color: var(--electric-blue);
  background: rgba(0, 212, 255, 0.14);
  box-shadow: inset 0 0 0 1px rgba(0, 212, 255, 0.25);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.7rem;
  border: 1px solid rgba(57, 255, 20, 0.4);
  border-radius: 999px;
  background: rgba(57, 255, 20, 0.08);
  color: var(--neon-green);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

.tag {
  display: inline-block;
  padding: 0.22rem 0.6rem;
  background: rgba(255, 90, 0, 0.12);
  border-left: 3px solid var(--signal-orange);
  color: var(--signal-orange);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.section-heading {
  position: relative;
  display: flex;
  align-items: flex-end;
  gap: 0.9rem;
  margin-bottom: 1.8rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.section-heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 74px;
  height: 3px;
  background: linear-gradient(90deg, var(--electric-blue), var(--neon-green));
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.4);
}

.section-heading__title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 2.45rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--moon-white);
  transform: skewX(-4deg);
}

.section-heading__annotation {
  height: 3.4em;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.4;
  letter-spacing: 0.3em;
  color: var(--cloud-gray);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.divider-line {
  height: 1px;
  margin: clamp(1.8rem, 5vw, 3.5rem) 0;
  border: 0;
  background: linear-gradient(90deg, var(--electric-blue), rgba(0, 212, 255, 0.08) 55%, transparent);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0 0 1rem;
  padding: 0.9rem 0;
  list-style: none;
  font-size: 0.82rem;
  color: var(--cloud-gray);
}

.breadcrumb li {
  display: flex;
  align-items: center;
}

.breadcrumb li + li::before {
  content: "/";
  margin: 0 0.5rem;
  color: var(--signal-orange);
  font-family: var(--font-mono);
}

.breadcrumb a {
  color: var(--electric-blue);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
  color: var(--moon-white);
  font-weight: 600;
}

.data-card {
  position: relative;
  padding: 1.4rem 1.5rem;
  background: var(--glass-white);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--radius);
  transition: transform var(--speed) var(--ease), box-shadow var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.data-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--electric-blue), var(--neon-green));
  opacity: 0.7;
}

.data-card:hover,
.data-card:focus-within {
  transform: translateY(-5px);
  border-color: rgba(0, 212, 255, 0.5);
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.4), 0 0 16px rgba(0, 212, 255, 0.18);
}

.data-card__number {
  display: block;
  font-family: var(--font-display);
  font-size: 2.5rem;
  line-height: 1.05;
  color: var(--electric-blue);
  transform: skewX(-4deg);
}

.data-card__label {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.84rem;
  letter-spacing: 0.1em;
  color: var(--moon-white);
}

.data-card__note {
  display: block;
  margin-top: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--neon-green);
}

.image-shell {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  background:
    linear-gradient(148deg, transparent 40%, rgba(0, 212, 255, 0.16) 50%, transparent 60%),
    linear-gradient(40deg, rgba(11, 20, 96, 0.5), rgba(27, 30, 35, 0.2));
  overflow: hidden;
}

.image-shell::after {
  content: "IMG";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.4em;
  color: rgba(230, 232, 236, 0.45);
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.07) 50%, transparent 70%);
  background-size: 220% 100%;
  animation: shell-sweep 4s var(--ease) infinite;
}

.frame {
  position: relative;
  padding: clamp(1.2rem, 3vw, 2rem);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.frame::before,
.frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.frame::before {
  top: -1px;
  left: -1px;
  border-top: 3px solid var(--electric-blue);
  border-left: 3px solid var(--electric-blue);
}

.frame::after {
  bottom: -1px;
  right: -1px;
  border-bottom: 3px solid var(--neon-green);
  border-right: 3px solid var(--neon-green);
}

/* ---------- 动效 ---------- */

@keyframes shell-sweep {
  0% {
    background-position: 130% 0;
  }
  100% {
    background-position: -90% 0;
  }
}

/* ---------- 响应式 ---------- */

@media (max-width: 960px) {
  .nav-list {
    gap: 0.8rem;
  }

  .nav-link {
    font-size: 0.88rem;
  }

  .brand-name {
    font-size: 2.1rem;
  }

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

  .split {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr 1.6fr;
    gap: 2rem;
  }
}

@media (max-width: 767px) {
  .masthead-inner {
    padding-top: 0.7rem;
    padding-bottom: 0.7rem;
  }

  .brand-svg {
    width: 36px;
    height: 36px;
  }

  .brand-name {
    font-size: 1.55rem;
  }

  .brand-slogan {
    font-size: 0.58rem;
    letter-spacing: 0.24em;
  }

  .js-app .nav-toggle {
    display: block;
  }

  .js-app .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 20;
    max-height: calc(100vh - 72px);
    overflow-y: auto;
    background: rgba(18, 21, 26, 0.97);
    border-top: 1px solid rgba(0, 212, 255, 0.2);
    border-bottom: 1px solid rgba(57, 255, 20, 0.25);
    box-shadow: 0 18px 30px rgba(0, 0, 0, 0.5);
  }

  .js-app .site-nav[data-open="true"] {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.6rem var(--container-pad) 1rem;
  }

  .nav-link {
    padding: 0.8rem 0.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    font-size: 1rem;
  }

  .nav-link::before {
    content: attr(data-index) " /";
  }

  .nav-link::after {
    display: none;
  }

  .nav-link[aria-current="page"] {
    border-left: 3px solid var(--electric-blue);
    padding-left: 0.8rem;
  }

  .site-header.is-compact .masthead-inner {
    padding-top: 0.45rem;
    padding-bottom: 0.45rem;
  }

  .site-header.is-compact .brand-svg {
    width: 28px;
    height: 28px;
  }

  .site-header.is-compact .brand-name {
    font-size: 1.25rem;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-columns {
    grid-template-columns: 1fr 1fr;
    gap: 1.4rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

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

@media (max-width: 480px) {
  .footer-columns {
    grid-template-columns: 1fr;
  }
}

/* ---------- 减弱动效 ---------- */

@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;
    transition-delay: 0ms !important;
  }
}