/* ================================================================
   安博电竞中文官方网站 SITE.KIT 共享样式
   文件：/assets/site.css
   母题：赛博编辑部 · 数据终端
   ================================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  --paper: #F5F0E8;
  --paper-deep: #EAE2D6;
  --ink: #1A1A1A;
  --ink-soft: #4A4A4A;
  --blue: #0B2A6B;
  --purple: #8A2BE2;
  --neon: #39FF14;
  --border-dark: #0D0D0D;
  --white: #FFFFFF;

  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Code", "Fira Code", Consolas, "Courier New", monospace;

  --content-max: 1280px;
  --gutter: clamp(20px, 4vw, 48px);
  --gutter-aligned: max(var(--gutter), calc((100vw - var(--content-max)) / 2 + var(--gutter)));
  --border-w: 3px;
  --nav-height: 88px;
  --breakpoint-nav: 1180px;

  --shadow-sm: 4px 4px 0 var(--border-dark);
  --shadow-md: 8px 8px 0 var(--border-dark);
  --shadow-lg: 12px 12px 0 var(--border-dark);
  --shadow-purple: 8px 8px 0 var(--purple);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-wrap: break-word;
}

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

[hidden] {
  display: none !important;
}

/* ---------- 基础排版 ---------- */
h1,
h2,
h3,
h4 {
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: 0.01em;
  color: var(--ink);
  text-wrap: balance;
}

h1 {
  font-size: clamp(40px, 7vw, 88px);
  font-weight: 200;
  letter-spacing: 0;
}

h2 {
  font-size: clamp(28px, 5vw, 56px);
}

h3 {
  font-size: clamp(20px, 3vw, 28px);
}

h4 {
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 500;
}

p {
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

ul,
ol {
  padding-left: 1.4em;
}

li {
  margin-bottom: 0.4em;
}

a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--purple);
  text-decoration-color: var(--purple);
}

strong,
b {
  font-weight: 700;
}

hr {
  border: 0;
  border-top: 3px solid var(--border-dark);
  margin: 2em 0;
}

::selection {
  background: var(--neon);
  color: var(--border-dark);
}

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

/* ---------- 辅助工具 ---------- */
.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;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.85em;
  letter-spacing: 0.04em;
}

.lead {
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.65;
  color: var(--ink);
}

.kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--purple);
}

/* ---------- 容器与章节 ---------- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow {
  max-width: 880px;
}

.container--wide {
  max-width: 1440px;
}

.section {
  padding-block: clamp(48px, 8vw, 96px);
}

.section--tight {
  padding-block: clamp(24px, 4vw, 48px);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin-bottom: clamp(24px, 4vw, 48px);
  padding-bottom: 12px;
  border-bottom: var(--border-w) solid var(--border-dark);
}

.section-head__idx {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--purple);
}

.section-head__title {
  margin: 0;
}

.section-head__sub {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-soft);
}

/* ---------- 面板 ---------- */
.panel {
  position: relative;
  background: var(--paper);
  border: var(--border-w) solid var(--border-dark);
  box-shadow: var(--shadow-md);
  padding: clamp(24px, 5vw, 64px);
}

.panel--deep {
  background: var(--paper-deep);
}

.panel--blue {
  background: var(--blue);
  color: var(--paper);
  border-color: var(--border-dark);
  box-shadow: 8px 8px 0 var(--purple);
}

.panel--ink {
  background: var(--border-dark);
  color: var(--paper);
  border-color: var(--border-dark);
  box-shadow: 8px 8px 0 var(--purple);
}

.panel--blue h1,
.panel--blue h2,
.panel--blue h3,
.panel--blue h4,
.panel--ink h1,
.panel--ink h2,
.panel--ink h3,
.panel--ink h4 {
  color: var(--paper);
}

/* ---------- 栅格 ---------- */
.grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.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));
}

@media (max-width: 980px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border: var(--border-w) solid var(--border-dark);
  box-shadow: var(--shadow-md);
  padding: clamp(20px, 3vw, 32px);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 12px 12px 0 var(--border-dark);
}

.card--blue {
  background: var(--blue);
  color: var(--paper);
}

.card--purple {
  background: var(--purple);
  color: var(--paper);
}

.card--deep {
  background: var(--paper-deep);
}

.card--blue h1,
.card--blue h2,
.card--blue h3,
.card--blue h4,
.card--purple h1,
.card--purple h2,
.card--purple h3,
.card--purple h4 {
  color: var(--paper);
}

.card__index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--purple);
  margin-bottom: 8px;
}

.card__title {
  font-size: 21px;
  font-weight: 500;
  margin-bottom: 8px;
}

.card__text {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 0;
}

.card--blue .card__text,
.card--purple .card__text,
.card--blue .card__index,
.card--purple .card__index {
  color: var(--paper);
  opacity: 0.85;
}

/* ---------- 目录组件 ---------- */
.toc-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-w) solid var(--border-dark);
}

.toc-item {
  margin: 0;
  border-bottom: var(--border-w) solid var(--border-dark);
}

.toc-link {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 4px;
  text-decoration: none;
  color: var(--ink);
  transition: background 0.15s ease, color 0.15s ease, padding-left 0.2s var(--ease);
}

.toc-link:hover {
  background: var(--blue);
  color: var(--paper);
  padding-left: 12px;
  text-decoration: none;
}

.toc-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--purple);
}

.toc-link:hover .toc-index {
  color: var(--neon);
}

.toc-title {
  font-size: clamp(18px, 3vw, 28px);
  font-weight: 300;
}

.toc-meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
}

.toc-link:hover .toc-meta {
  color: rgba(245, 240, 232, 0.8);
}

/* ---------- 数据指标 ---------- */
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.stat {
  border: var(--border-w) solid var(--border-dark);
  background: var(--paper);
  box-shadow: var(--shadow-sm);
  padding: 16px 18px;
}

.stat__value {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-top: 4px;
}

.stat--inverted {
  background: var(--blue);
  color: var(--paper);
  border-color: var(--border-dark);
  box-shadow: 4px 4px 0 var(--purple);
}

.stat--inverted .stat__value {
  color: var(--neon);
}

.stat--inverted .stat__label {
  color: rgba(245, 240, 232, 0.8);
}

@media (max-width: 620px) {
  .stat-row {
    grid-template-columns: 1fr;
  }
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-block;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--paper-deep);
  border: 2px solid var(--border-dark);
}

.tag--blue {
  background: var(--blue);
  color: var(--paper);
}

.tag--purple {
  background: var(--purple);
  color: var(--paper);
}

.tag--neon {
  background: var(--neon);
  color: var(--ink);
}

/* ---------- 提示条 ---------- */
.notice {
  border: 2px solid var(--border-dark);
  border-left: 8px solid var(--neon);
  background: var(--paper-deep);
  padding: 18px 22px;
  font-size: 14px;
  box-shadow: var(--shadow-sm);
}

.notice__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--purple);
  margin-bottom: 4px;
}

.notice--blue {
  background: var(--blue);
  color: var(--paper);
  border-left-color: var(--neon);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 8px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 14px;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--purple);
}

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

.breadcrumb a:hover {
  color: var(--purple);
  text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
  color: var(--ink-soft);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  padding: 11px 22px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink);
  background: var(--paper);
  border: var(--border-w) solid var(--border-dark);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s var(--ease), box-shadow 0.15s var(--ease), background 0.15s ease, color 0.15s ease;
}

.btn:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--border-dark);
  background: var(--paper-deep);
  color: var(--purple);
}

.btn:active {
  transform: translate(3px, 3px);
  box-shadow: none;
}

.btn--primary {
  background: var(--blue);
  color: var(--paper);
  box-shadow: 4px 4px 0 var(--purple);
}

.btn--primary:hover {
  background: var(--purple);
  color: var(--paper);
  box-shadow: 2px 2px 0 var(--purple);
}

.btn--neon {
  background: var(--neon);
  color: var(--ink);
  border-color: var(--border-dark);
  box-shadow: 4px 4px 0 var(--purple);
}

.btn--neon:hover {
  background: var(--white);
  color: var(--ink);
  box-shadow: 2px 2px 0 var(--purple);
}

.btn--ghost {
  background: transparent;
  box-shadow: none;
}

.btn--ghost:hover {
  background: var(--paper);
  box-shadow: var(--shadow-sm);
}

/* ---------- 筛选输入 ---------- */
.filter-field {
  display: block;
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ink);
  background: var(--white);
  border: var(--border-w) solid var(--border-dark);
  box-shadow: 4px 4px 0 var(--purple);
  border-radius: 0;
  appearance: none;
}

.filter-field::placeholder {
  color: var(--ink-soft);
}

.filter-field:focus-visible {
  outline: 3px solid var(--neon);
  outline-offset: 2px;
}

/* ---------- 图片容器 ---------- */
.image-frame {
  position: relative;
  border: var(--border-w) solid var(--border-dark);
  background:
    linear-gradient(135deg, var(--paper-deep) 25%, transparent 25%) 0 0 / 18px 18px,
    linear-gradient(315deg, var(--paper-deep) 25%, transparent 25%) 0 0 / 18px 18px,
    var(--white);
  box-shadow: var(--shadow-md);
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(to bottom, transparent 0 3px, rgba(13, 13, 13, 0.08) 3px 4px);
  pointer-events: none;
}

.image-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-frame--portrait {
  aspect-ratio: 3 / 4;
}

.image-frame--wide {
  aspect-ratio: 21 / 9;
}

.image-frame--square {
  aspect-ratio: 1 / 1;
}

.image-caption {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-top: 10px;
  padding-top: 6px;
  border-top: 1px solid var(--paper-deep);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-soft);
}

/* ================================================================
   页头
   ================================================================ */
.site-header {
  position: relative;
  z-index: 1000;
  background: var(--paper);
  border-bottom: 4px solid var(--border-dark);
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 3000;
  padding: 10px 18px;
  background: var(--border-dark);
  color: var(--neon);
  font-weight: 700;
  text-decoration: none;
  border: 2px solid var(--neon);
  box-shadow: 4px 4px 0 var(--purple);
  transform: translateY(-300%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

.header-status {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--blue);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 8px var(--gutter-aligned);
  border-bottom: 2px solid var(--border-dark);
}

.status-dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  background: var(--neon);
  border: 1px solid var(--border-dark);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.25);
}

.status-text {
  color: var(--paper);
}

.status-slash {
  margin-left: auto;
  color: var(--purple);
}

.status-note {
  background: var(--purple);
  color: var(--paper);
  padding: 4px 14px;
  letter-spacing: 0.1em;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.header-bar {
  position: relative;
  background: var(--paper);
}

.header-inner {
  display: flex;
  align-items: stretch;
  gap: 28px;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: var(--nav-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  text-decoration: none;
  color: var(--ink);
}

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

.brand-mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  background: var(--blue);
  border: 3px solid var(--border-dark);
  box-shadow: 4px 4px 0 var(--purple);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--neon);
  transform: rotate(-3deg);
  transition: transform 0.25s var(--ease);
}

.brand:hover .brand-mark {
  transform: rotate(0deg) scale(1.04);
}

.brand-copy {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  line-height: 1.6;
  color: var(--ink-soft);
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: stretch;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: stretch;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  display: flex;
  align-items: stretch;
  margin: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 14px;
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  color: var(--ink);
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 0;
  height: 5px;
  background: var(--neon);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease);
}

.nav-link:hover {
  color: var(--blue);
  text-decoration: none;
}

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

.nav-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  color: var(--purple);
}

.nav-label {
  line-height: 1.2;
}

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

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

.nav-quick {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  margin-left: auto;
  padding-left: 22px;
  border-left: 2px solid var(--paper-deep);
}

.quick-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.quick-links {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px;
}

.quick-link {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  color: var(--purple);
  text-decoration: none;
  padding: 3px 7px;
  background: var(--paper-deep);
  border: 2px solid var(--border-dark);
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}

.quick-link:hover {
  background: var(--neon);
  color: var(--ink);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 50px;
  height: 50px;
  margin-block: auto;
  padding: 12px;
  background: var(--border-dark);
  border: 3px solid var(--border-dark);
  box-shadow: 3px 3px 0 var(--purple);
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease, box-shadow 0.1s ease;
}

.nav-toggle:hover {
  background: var(--blue);
}

.nav-toggle:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--purple);
}

.toggle-bar {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--neon);
  transition: transform 0.25s var(--ease), opacity 0.2s ease;
}

[data-nav-toggle][aria-expanded="true"] .toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

[data-nav-toggle][aria-expanded="true"] .toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 移动端页头 ---------- */
@media (max-width: 1180px) {
  .header-inner {
    min-height: 72px;
  }

  .brand-mark {
    width: 44px;
    height: 44px;
    font-size: 15px;
  }

  .brand-name {
    font-size: 20px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin: 0;
    background: var(--paper);
    border-bottom: 4px solid var(--border-dark);
    box-shadow: 0 18px 40px rgba(13, 13, 13, 0.25);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height 0.32s var(--ease), visibility 0s linear 0.32s;
  }

  .site-nav[data-open] {
    max-height: min(640px, calc(100vh - 72px));
    overflow-y: auto;
    visibility: visible;
    transition: max-height 0.32s var(--ease), visibility 0s;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0;
    border-bottom: 3px solid var(--border-dark);
  }

  .nav-link {
    min-height: 50px;
    padding: 0 22px;
    border-left: 5px solid transparent;
  }

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

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

  .nav-quick {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin: 0;
    padding: 18px 22px;
    border-left: 0;
    border-top: 2px solid var(--paper-deep);
  }

  .quick-links {
    flex-wrap: wrap;
  }
}

@media (max-width: 640px) {
  .status-slash,
  .status-note {
    display: none;
  }

  .header-status {
    gap: 8px;
  }
}

/* ================================================================
   页脚
   ================================================================ */
.site-footer {
  position: relative;
  background: var(--blue);
  color: var(--paper);
  border-top: 6px solid var(--border-dark);
  margin-top: clamp(64px, 10vw, 120px);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -6px;
  right: 0;
  width: min(480px, 60%);
  height: 6px;
  background: var(--purple);
}

.footer-inner {
  max-width: var(--content-max);
  margin-inline: auto;
  padding: clamp(48px, 6vw, 80px) var(--gutter) 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr 0.9fr 1.2fr;
  gap: clamp(32px, 5vw, 64px);
}

@media (max-width: 980px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 620px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
  text-decoration: none;
}

.footer-brand:hover {
  color: var(--neon);
}

.brand-mark--footer {
  background: var(--neon);
  color: var(--ink);
  border-color: var(--border-dark);
  box-shadow: 4px 4px 0 var(--purple);
}

.footer-about .brand-name {
  color: var(--paper);
  font-size: 26px;
}

.footer-lead {
  margin: 16px 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--neon);
}

.footer-trust {
  max-width: 42em;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 240, 232, 0.82);
}

.footer-mono {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(245, 240, 232, 0.55);
}

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

.footer-title {
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(245, 240, 232, 0.22);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--neon);
}

.footer-list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-list li {
  margin: 0;
}

.footer-list a {
  display: inline-block;
  padding: 3px 0;
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.footer-list a:hover {
  color: var(--neon);
  border-color: var(--neon);
}

.footer-contact-line {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--paper);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 28px;
  margin-top: 48px;
  padding-top: 18px;
  border-top: 1px solid rgba(245, 240, 232, 0.22);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: rgba(245, 240, 232, 0.65);
}

.footer-copy,
.footer-icp,
.footer-tag {
  margin: 0;
}

.footer-tag {
  color: var(--purple);
}

/* ---------- 返回顶部 ---------- */
.btn--scroll-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 900;
  display: none;
  padding: 10px 16px;
  background: var(--border-dark);
  border-color: var(--border-dark);
  color: var(--neon);
  box-shadow: 4px 4px 0 var(--purple);
}

.btn--scroll-top:hover {
  background: var(--purple);
  color: var(--paper);
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--purple);
}

.btn--scroll-top.is-visible {
  display: inline-flex;
}

.scroll-top-mark {
  font-size: 18px;
  line-height: 1;
}

.scroll-top-text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

/* ================================================================
   滚动显现
   ================================================================ */
[data-reveal] {
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

[data-reveal].is-hidden {
  opacity: 0;
  transform: translateY(28px);
}

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

/* ================================================================
   无障碍与动效降级
   ================================================================ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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

  [data-reveal] {
    transition: none;
  }

  [data-reveal].is-hidden {
    opacity: 1;
    transform: none;
  }
}