/* ========== 共享基础变量 ========== */
:root {
  --color-deep-blue: #0A1E3F;
  --color-dark-blue: #112B54;
  --color-ink-blue: #0B1B2E;
  --color-red: #E63946;
  --color-yellow: #F9C74F;
  --color-data-blue: #00D4FF;
  --color-white: #FFFFFF;
  --color-silver: #E5E7EB;
  --color-gray: #9CA3AF;
  --font-head: "DIN Condensed", Impact, "Arial Narrow", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Sarasa Mono", "Courier New", Consolas, monospace;
  --max-width: 1200px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --header-h: 72px;
  --transition-fast: 200ms ease;
  --transition-base: 300ms ease;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
  --border-thin: 1px solid rgba(229, 231, 235, 0.1);
}

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

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

body {
  background: var(--color-deep-blue);
  color: var(--color-silver);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-data-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-red);
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.15;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ========== 可访问焦点 ========== */
:focus-visible {
  outline: 2px solid var(--color-yellow);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -100px;
  z-index: 2000;
  background: var(--color-red);
  color: var(--color-white);
  font-weight: 700;
  padding: 12px 24px;
  border-radius: 4px;
  transition: top var(--transition-fast);
}

.skip-link:focus-visible {
  top: 12px;
}

/* ========== 容器与章节 ========== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

.section {
  padding: var(--space-2xl) 0;
}

.main-content {
  flex: 1 0 auto;
}

/* ========== 通用标题与正文容器 ========== */
.page-head {
  padding: var(--space-2xl) 0 var(--space-xl);
}

.page-head__title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  color: var(--color-white);
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
}

.page-head__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8%;
  bottom: 8%;
  width: 6px;
  background: var(--color-red);
  transform: skewX(-12deg);
}

.page-head__subtitle {
  color: var(--color-gray);
  font-size: 1.1rem;
}

.prose {
  font-size: 1rem;
  color: var(--color-silver);
  line-height: 1.9;
  max-width: 760px;
}

.prose p + p {
  margin-top: 1.5em;
}

/* ========== 头部命令栏 ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 27, 46, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(229, 231, 235, 0.08);
  position: relative;
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-red);
  z-index: 1;
}

.site-header::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 0;
  width: 12%;
  height: 4px;
  background: var(--color-yellow);
  clip-path: polygon(0 0, 100% 0, calc(100% - 18px) 100%, 0 100%);
  z-index: 1;
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  min-height: var(--header-h);
  position: relative;
}

/* 品牌 */
.brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-shrink: 0;
  padding: 8px 0;
}

.brand__logo {
  font-family: var(--font-head);
  font-size: 1.9rem;
  font-weight: 900;
  color: var(--color-white);
  letter-spacing: 0.04em;
  line-height: 1;
}

.brand__slash {
  color: var(--color-red);
  margin: 0 2px;
}

.brand__slogan {
  font-size: 0.78rem;
  color: var(--color-gray);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* 导航切换按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: var(--border-thin);
  border-radius: 4px;
  background: transparent;
  color: var(--color-silver);
  font-size: 0.85rem;
}

.nav-toggle__box {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 20px;
}

.nav-toggle__bar {
  height: 2px;
  background: var(--color-silver);
  width: 100%;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

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

.nav-panel[data-open] .nav-toggle__text,
.nav-toggle__text {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}

/* 导航面板 */
.nav-panel {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-list__item {
  position: relative;
}

.nav-list__link {
  display: block;
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-silver);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: color var(--transition-fast), background var(--transition-fast);
  border-left: 2px solid transparent;
}

.nav-list__link:hover {
  color: var(--color-yellow);
  background: rgba(0, 212, 255, 0.06);
  border-left-color: var(--color-yellow);
}

.nav-list__link[aria-current="page"] {
  color: var(--color-red);
  background: rgba(230, 57, 70, 0.1);
  border-left-color: var(--color-red);
}

.nav-list__link--cta {
  background: var(--color-red);
  color: var(--color-white);
  border-radius: 4px;
  padding: 10px 22px;
  font-family: var(--font-head);
  letter-spacing: 0.08em;
  border-left: none;
  margin-left: 12px;
  box-shadow: 0 2px 14px rgba(230, 57, 70, 0.35);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-list__link--cta:hover {
  background: #ff4d5a;
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230, 57, 70, 0.5);
  border-left: none;
}

/* ========== 页脚 ========== */
.site-footer {
  background: var(--color-ink-blue);
  border-top: 4px solid var(--color-red);
  position: relative;
  margin-top: auto;
  padding: var(--space-2xl) 0 0;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 14%;
  height: 4px;
  background: var(--color-yellow);
  clip-path: polygon(0 0, 100% 0, calc(100% - 24px) 100%, 0 100%);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-xl);
  padding: var(--space-xl) 0;
}

.footer-brand__logo {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 900;
  color: var(--color-white);
  letter-spacing: 0.06em;
  display: inline-block;
  margin-bottom: 8px;
  position: relative;
}

.footer-brand__logo::after {
  content: "//";
  color: var(--color-red);
  margin-left: 6px;
}

.footer-brand__slogan {
  color: var(--color-yellow);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.footer-brand__tagline {
  color: var(--color-gray);
  font-size: 0.85rem;
  max-width: 310px;
  line-height: 1.7;
  border-left: 2px solid rgba(230, 57, 70, 0.6);
  padding-left: 12px;
}

.footer-col__title {
  font-size: 0.85rem;
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(230, 57, 70, 0.3);
}

.footer-nav__item {
  margin-bottom: 10px;
}

.footer-nav__link {
  color: var(--color-gray);
  font-size: 0.9rem;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-nav__link:hover {
  color: var(--color-yellow);
  padding-left: 4px;
}

.footer-contact__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-contact__item {
  display: flex;
  flex-direction: column;
  font-size: 0.88rem;
}

.footer-contact__label {
  color: var(--color-gray);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 2px;
}

.footer-contact__link {
  color: var(--color-silver);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  word-break: break-all;
}

.footer-contact__link:hover {
  color: var(--color-data-blue);
}

.footer-contact__text {
  color: var(--color-silver);
  font-size: 0.85rem;
  line-height: 1.6;
}

.footer-bottom {
  border-top: var(--border-thin);
  padding: 20px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
}

.footer-bottom__copy,
.footer-bottom__icp,
.footer-bottom__contact {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-gray);
  letter-spacing: 0.02em;
}

.footer-bottom__icp a {
  color: var(--color-gray);
  transition: color var(--transition-fast);
}

.footer-bottom__icp a:hover {
  color: var(--color-yellow);
}

.footer-bottom__contact {
  color: var(--color-gray);
}

/* ========== 通用按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 2px;
  transition: all var(--transition-base);
  cursor: pointer;
}

.btn--primary {
  background: var(--color-red);
  color: var(--color-white);
  box-shadow: 0 4px 16px rgba(230, 57, 70, 0.35);
}

.btn--primary:hover {
  background: #ff4d5a;
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(230, 57, 70, 0.5);
}

.btn--ghost {
  background: transparent;
  color: var(--color-silver);
  border: 1px solid rgba(229, 231, 235, 0.3);
}

.btn--ghost:hover {
  border-color: var(--color-data-blue);
  color: var(--color-data-blue);
  transform: translateY(-2px);
}

/* ========== 面包屑 ========== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 0.82rem;
  color: var(--color-gray);
}

.breadcrumb__link {
  color: var(--color-gray);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

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

.breadcrumb__sep {
  color: var(--color-red);
  font-family: var(--font-mono);
}

.breadcrumb__current {
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ========== 栅格系统 ========== */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

/* ========== 卡片组件 ========== */
.card {
  background: var(--color-dark-blue);
  border: var(--border-thin);
  border-radius: 2px;
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
  border-color: rgba(0, 212, 255, 0.3);
}

.card--accent {
  position: relative;
  overflow: hidden;
}

.card--accent::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-red);
  clip-path: polygon(0 0, 100% 0, calc(100% - 30px) 100%, 0 100%);
}

.card__title {
  font-size: 1.35rem;
  margin-bottom: 10px;
}

.card__text {
  color: var(--color-gray);
  font-size: 0.9rem;
  line-height: 1.7;
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-gray);
  margin-top: 12px;
  letter-spacing: 0.04em;
}

/* ========== 数据统计 ========== */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.stat {
  background: var(--color-dark-blue);
  border-left: 4px solid var(--color-red);
  padding: 20px 16px;
  box-shadow: var(--shadow-card);
}

.stat--yellow {
  border-left-color: var(--color-yellow);
}

.stat--blue {
  border-left-color: var(--color-data-blue);
}

.stat__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-gray);
  margin-bottom: 8px;
  display: block;
}

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1;
}

.stat__value--red {
  color: var(--color-red);
}

.stat__value--yellow {
  color: var(--color-yellow);
}

.stat__value--blue {
  color: var(--color-data-blue);
}

.stat__footer {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-gray);
  margin-top: 8px;
}

/* ========== 标签芯片 ========== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid transparent;
  border-radius: 2px;
  background: transparent;
  white-space: nowrap;
}

.tag--red {
  color: var(--color-red);
  border-color: rgba(230, 57, 70, 0.5);
  background: rgba(230, 57, 70, 0.08);
}

.tag--yellow {
  color: var(--color-yellow);
  border-color: rgba(249, 199, 79, 0.5);
  background: rgba(249, 199, 79, 0.08);
}

.tag--blue {
  color: var(--color-data-blue);
  border-color: rgba(0, 212, 255, 0.5);
  background: rgba(0, 212, 255, 0.06);
}

.tag--red::before {
  content: "●";
  font-size: 0.5rem;
  animation: tag-pulse 2s infinite;
}

@keyframes tag-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ========== 数据表格 ========== */
.data-table-wrap {
  overflow-x: auto;
  border: var(--border-thin);
  background: var(--color-dark-blue);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.data-table thead {
  background: var(--color-red);
  color: var(--color-white);
}

.data-table th {
  padding: 12px 16px;
  text-align: left;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(229, 231, 235, 0.06);
  color: var(--color-silver);
}

.data-table tbody tr:hover {
  background: rgba(0, 212, 255, 0.05);
}

/* ========== 滚动进度条 ========== */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: transparent;
  z-index: 3000;
}

.progress-bar__fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-red), var(--color-yellow));
  transition: width 80ms linear;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }

  .brand__slogan {
    display: none;
  }

  .nav-list__link {
    padding: 8px 12px;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: inline-flex;
    z-index: 1100;
  }

  .nav-panel {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-ink-blue);
    border-bottom: 4px solid var(--color-red);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base), opacity var(--transition-base);
    opacity: 0;
  }

  .nav-panel[data-open] {
    max-height: 500px;
    opacity: 1;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 16px 20px 24px;
    gap: 4px;
  }

  .nav-list__link {
    border-left: 3px solid transparent;
    padding: 12px 14px;
    font-size: 1rem;
  }

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

  .nav-list__link--cta {
    margin-left: 0;
    margin-top: 8px;
    border-radius: 0;
    text-align: center;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  .header-bar {
    padding-left: 16px;
    padding-right: 16px;
  }

  .brand__logo {
    font-size: 1.6rem;
  }

  .nav-toggle__text {
    display: none;
  }

  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .section {
    padding: var(--space-xl) 0;
  }

  .page-head__title {
    padding-left: 14px;
  }
}

/* ========== 减少动效 ========== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .progress-bar__fill {
    transition: none;
  }
}