/* ==========================================================
   博澳赛场 · Shared Site Kit
   /assets/site.css
   ========================================================== */

/* ---------- 设计变量 ---------- */
:root {
  --color-bg: #0a0e1a;
  --color-bg-elevated: #10182b;
  --color-bg-card: #1a2438;
  --color-text: #e6edf3;
  --color-text-muted: #9aa7b8;
  --color-accent: #33ff99;
  --color-accent-orange: #ff8c42;

  --color-text-rgb: 230, 237, 243;
  --color-accent-rgb: 51, 255, 153;
  --color-bg-rgb: 10, 14, 26;

  --color-border: rgba(230, 237, 243, 0.15);
  --color-border-accent: rgba(51, 255, 153, 0.6);

  --font-serif: 'Noto Serif SC', 'Songti SC', STSong, 'SimSun', serif;
  --font-sans: 'Rajdhani', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --header-width: 300px;
  --header-height: 64px;
  --container-max: 1200px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: 0.25s ease;
  --transition-med: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-smooth: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-slow: 0.5s cubic-bezier(0.22, 1, 0.36, 1);

  --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.35);
  --shadow-drawer: 0 0 40px rgba(0, 0, 0, 0.5);
}

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

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

body {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image: linear-gradient(rgba(var(--color-text-rgb), 0.018) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(var(--color-text-rgb), 0.018) 1px, transparent 1px);
  background-size: 48px 48px;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  margin: 0 0 0.5em;
}

p { margin: 0 0 1em; }

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover { color: inherit; }

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

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

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

blockquote {
  margin: 1.5rem 0;
  padding: 0.75rem 1.25rem;
  border-left: 3px solid var(--color-border-accent);
  background: rgba(var(--color-accent-rgb), 0.05);
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--color-text);
  border-radius: 0 8px 8px 0;
}

code {
  font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
  font-size: 0.85em;
  background: var(--color-bg-card);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--color-border);
  color: var(--color-accent);
}

hr,
.hairline {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

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

/* ---------- 主内容 ---------- */
#main-content {
  display: block;
  min-height: 70vh;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

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

.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 4000;
  padding: 0.65rem 1.2rem;
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  border-radius: 4px;
  transform: translateY(-200%);
  transition: transform var(--transition-smooth);
}

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

/* ---------- 滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-orange));
  box-shadow: 0 0 12px rgba(var(--color-accent-rgb), 0.5);
  z-index: 3500;
  pointer-events: none;
  transition: width 0.12s linear;
}

body {
  padding-left: 0;
}

/* ---------- 头部：桌面端 ---------- */
@media (min-width: 1024px) {
  body {
    padding-left: var(--header-width);
  }
}

.site-header {
  background-color: var(--color-bg-elevated);
  background-image: linear-gradient(rgba(var(--color-text-rgb), 0.15) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(var(--color-text-rgb), 0.15) 1px, transparent 1px);
  background-size: 40px 40px;
  border-right: 1px solid var(--color-border);
  position: fixed;
  top: 0;
  left: 0;
  width: var(--header-width);
  height: 100vh;
  z-index: 1200;
  display: flex;
  flex-direction: column;
  padding: 2rem 1.5rem 1.5rem;
  overflow-y: auto;
  overflow-x: hidden;
}

.site-header::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 8px;
  background: repeating-linear-gradient(to bottom,
    transparent 0,
    transparent 5px,
    rgba(var(--color-text-rgb), 0.15) 5px,
    rgba(var(--color-text-rgb), 0.15) 7px);
  opacity: 0.4;
  pointer-events: none;
}

.header-core {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2.5rem;
  position: relative;
  z-index: 2;
}

.header-core::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 24px;
  height: 24px;
  background: linear-gradient(225deg, var(--color-bg) 50%, transparent 50%);
  z-index: 1;
  pointer-events: none;
}

/* ---------- 品牌 ---------- */
.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--color-text);
}

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

.brand-mark {
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--color-accent), rgba(var(--color-accent-rgb), 0.25));
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1;
  color: var(--color-bg);
  letter-spacing: -0.02em;
  position: relative;
}

.brand-mark::after {
  content: '';
  position: absolute;
  right: -3px;
  top: -3px;
  width: 10px;
  height: 10px;
  background: var(--color-accent-orange);
  border: 2px solid var(--color-bg-elevated);
  border-radius: 50%;
  animation: warm-pulse 2.5s ease-in-out infinite;
}

@keyframes warm-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(1.25); }
}

.brand-label {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.4rem;
  line-height: 1.1;
  letter-spacing: 0.06em;
  color: var(--color-text);
  white-space: nowrap;
}

.brand-tagline {
  font-family: var(--font-serif);
  font-size: 0.68rem;
  color: var(--color-text-muted);
  letter-spacing: 0.18em;
  white-space: nowrap;
}

/* ---------- 移动端导航按钮 ---------- */
.nav-toggle {
  display: none;
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-bg-card);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--color-border-accent);
  background: rgba(var(--color-accent-rgb), 0.08);
}

.nav-toggle-bars {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
  align-items: center;
}

.nav-toggle-bar {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-med), opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.nav-toggle-text {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
}

/* ---------- 主导航 ---------- */
.site-nav {
  position: relative;
  z-index: 2;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.nav-caption {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin: 0 0 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-caption::after {
  content: '';
  display: block;
  width: 36px;
  height: 1px;
  background: var(--color-border-accent);
}

.nav-list {
  position: relative;
  padding-left: 1.25rem;
  counter-reset: nav-counter;
}

.nav-list::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-border-accent), rgba(var(--color-text-rgb), 0.15) 25%, rgba(var(--color-text-rgb), 0.15) 75%, var(--color-border-accent));
}

.nav-item {
  counter-increment: nav-counter;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.55rem 0.75rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  border-radius: 4px;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.nav-link::before {
  content: '';
  position: absolute;
  left: -1.25rem;
  top: 50%;
  width: 8px;
  height: 8px;
  border: 2px solid var(--color-border);
  background: var(--color-bg-elevated);
  transform: translateY(-50%) rotate(45deg);
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text);
  background: rgba(var(--color-accent-rgb), 0.06);
  transform: translateX(4px);
}

.nav-link:hover::before {
  background: var(--color-border-accent);
  border-color: var(--color-accent);
}

.nav-link[aria-current="page"] {
  color: var(--color-accent);
  background: linear-gradient(90deg, rgba(var(--color-accent-rgb), 0.1), transparent 75%);
}

.nav-link[aria-current="page"]::before {
  background: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 0 12px rgba(var(--color-accent-rgb), 0.6), 0 0 4px var(--color-accent);
}

.nav-index {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  opacity: 0.7;
  letter-spacing: 0.08em;
  flex-shrink: 0;
  font-weight: 700;
}

.nav-link:hover .nav-index,
.nav-link[aria-current="page"] .nav-index {
  color: var(--color-accent);
  opacity: 1;
}

.nav-label {
  font-size: 0.95rem;
  line-height: 1.2;
}

/* ---------- 导航辅助区 ---------- */
.header-aux {
  margin-top: auto;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.header-download {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--color-text);
  transition: border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}

.header-download:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(var(--color-accent-rgb), 0.08);
  box-shadow: 0 0 20px rgba(var(--color-accent-rgb), 0.15);
}

.header-download-icon {
  font-size: 1.1rem;
  line-height: 1;
  color: var(--color-accent);
}

.header-coord {
  font-family: var(--font-sans);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  opacity: 0.6;
  user-select: none;
}

/* ---------- 抽屉遮罩 ---------- */
.nav-overlay {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(var(--color-bg-rgb), 0.8);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 1100;
}

.nav-overlay[data-open] {
  opacity: 1;
  pointer-events: auto;
}

body[data-no-scroll] {
  overflow: hidden;
}

/* ---------- 头部：移动端抽屉 ---------- */
@media (max-width: 1023px) {
  .site-header {
    position: sticky;
    top: 0;
    width: 100%;
    height: var(--header-height);
    min-height: var(--header-height);
    padding: 0 1rem;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    overflow: visible;
  }

  .site-header::before,
  .site-header::after {
    display: none;
  }

  .header-core {
    width: 100%;
    margin-bottom: 0;
    align-items: center;
  }

  .header-core::before {
    display: none;
  }

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

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: min(320px, 84vw);
    background: var(--color-bg-elevated);
    border-right: 1px solid var(--color-border);
    padding: 1.5rem 1.5rem 2rem;
    transform: translateX(-105%);
    transition: transform var(--transition-smooth);
    z-index: 1200;
    overflow-y: auto;
    flex: none;
  }

  .site-nav::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--color-accent), transparent 60%);
    opacity: 0.5;
    pointer-events: none;
  }

  .site-nav[data-open] {
    transform: translateX(0);
    box-shadow: var(--shadow-drawer);
  }

  .header-aux {
    margin-top: 2rem;
  }
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  position: relative;
  padding: 3rem 1.5rem 1.5rem;
  margin-top: 4rem;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 120px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
}

.footer-shell {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 2rem;
  padding-bottom: 2rem;
}

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

.footer-panel-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-panel-links {
  padding-left: 0.5rem;
}

.footer-panel-contact {
  padding-left: 0.5rem;
}

.footer-brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--color-accent), rgba(var(--color-accent-rgb), 0.2));
  clip-path: polygon(7px 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%, 0 7px);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-bg);
  margin-bottom: 1rem;
}

.footer-brand-name {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.08em;
  color: var(--color-text);
  margin-bottom: 0.15rem;
}

.footer-brand-tagline {
  font-family: var(--font-serif);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.14em;
  margin-bottom: 1rem;
}

.footer-trust {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  border-left: 2px solid var(--color-border-accent);
  padding-left: 0.9rem;
  max-width: 34ch;
}

.footer-heading {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.footer-heading::after {
  content: '';
  display: block;
  width: 28px;
  height: 1px;
  background: var(--color-border-accent);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-link {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  padding: 0.15rem 0;
  transition: color 0.2s, padding-left 0.2s;
}

.footer-link:hover {
  color: var(--color-accent);
  padding-left: 0.35rem;
}

.footer-text {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.footer-bottom {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.footer-copyright,
.footer-icp {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  opacity: 0.75;
}

@media (max-width: 768px) {
  .footer-shell {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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

/* ---------- 内容容器 / 章节 ---------- */
.content-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  width: 100%;
}

.section {
  padding: 4rem 1.5rem;
}

.section + .section {
  border-top: 1px solid var(--color-border);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  line-height: 1;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition-fast);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

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

.btn-primary:hover {
  background: transparent;
  color: var(--color-accent);
  box-shadow: 0 0 24px rgba(var(--color-accent-rgb), 0.6);
}

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

.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(var(--color-accent-rgb), 0.06);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding: 1rem 0;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin: 0;
}

.breadcrumb-sep {
  color: var(--color-accent);
  opacity: 0.6;
}

.breadcrumb-link {
  color: var(--color-text-muted);
  transition: color 0.2s;
}

.breadcrumb-link:hover {
  color: var(--color-accent);
}

.breadcrumb-current {
  color: var(--color-text);
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--color-accent);
  background: rgba(var(--color-accent-rgb), 0.08);
  border: 1px solid var(--color-border-accent);
  border-radius: 3px;
  text-transform: uppercase;
}

/* ---------- 章节标签 ---------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
}

.section-label::before {
  content: '';
  display: block;
  width: 32px;
  height: 2px;
  background: var(--color-accent);
  clip-path: polygon(0 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}

/* ---------- 切角面板 ---------- */
.cut-panel {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  clip-path: polygon(16px 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%, 0 16px);
  padding: 1.8rem;
  position: relative;
}

.cut-panel--accent {
  border-color: var(--color-border-accent);
  background: linear-gradient(135deg, rgba(var(--color-accent-rgb), 0.08), var(--color-bg-card) 40%);
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: transform var(--transition-med),
              border-color 0.3s ease,
              box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-accent);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(var(--color-accent-rgb), 0.08);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  transition: width 0.4s var(--ease-out);
}

.card:hover::before {
  width: 100%;
}

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

.card-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  color: var(--color-text);
  margin: 0;
}

.card-body {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  line-height: 1.75;
}

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

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

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

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

/* ---------- 蓝图网格 ---------- */
.blueprint-grid {
  background-image: linear-gradient(rgba(var(--color-text-rgb), 0.15) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(var(--color-text-rgb), 0.15) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* ---------- 数据展示 ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.stat-value {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 2.2rem;
  line-height: 1.1;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.stat-label {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--color-text-muted);
  text-transform: uppercase;
  margin-top: 0.3rem;
}

/* ---------- 数据流线 ---------- */
.data-line {
  height: 1px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  position: relative;
  overflow: hidden;
}

.data-line::after {
  content: '';
  position: absolute;
  top: 0;
  left: -60%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  animation: data-flow 2.8s ease-in-out infinite;
}

@keyframes data-flow {
  from { left: -60%; }
  to { left: 120%; }
}

/* ---------- 滚动显现 ---------- */
html:not(.js) [data-reveal] {
  opacity: 1;
  transform: none;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow) var(--reveal-delay, 0s),
              transform var(--transition-slow) var(--reveal-delay, 0s);
}

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

/* ---------- 响应式网格 ---------- */
@media (max-width: 992px) {
  .grid-4col { grid-template-columns: repeat(2, 1fr); }
  .grid-3col { grid-template-columns: repeat(2, 1fr); }
}

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

/* ---------- 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,
  .data-line::after,
  .brand-mark::after {
    display: none;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .card:hover {
    transform: none;
  }
}