/* ============ 变量与重置 ============ */
:root {
  --color-primary: #0B4F6C;
  --color-snow: #F4F8FA;
  --color-white: #FFFFFF;
  --color-accent: #FF6B35;
  --color-green: #5FA800;
  --color-gold: #D4A017;
  --color-ink: #2B2D42;
  --color-gray: #5C6B73;
  --color-lake: #1D7874;
  --color-border: rgba(11, 79, 108, 0.16);
  --font-heading: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Consolas", monospace;
  --container-max: 1280px;
  --shadow-sm: 0 1px 3px rgba(11, 79, 108, 0.08);
  --shadow-md: 0 10px 30px rgba(11, 79, 108, 0.14);
  --ease: 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

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

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-ink);
  background-color: var(--color-snow);
  background-image:
    radial-gradient(circle at 18% 10%, rgba(11, 79, 108, 0.06) 0%, transparent 45%),
    linear-gradient(rgba(11, 79, 108, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 79, 108, 0.035) 1px, transparent 1px);
  background-size: auto, 48px 48px, 48px 48px;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

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

a {
  color: var(--color-primary);
  text-underline-offset: 3px;
  transition: color var(--ease);
}

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

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

/* ============ 通用排版 ============ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.15;
  color: var(--color-primary);
  margin-bottom: 0.5em;
}

h1 { font-size: clamp(2.2rem, 5vw, 4rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.4rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }

p { margin-bottom: 1em; }

ul, ol {
  margin: 0 0 1em 1.25em;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.lede {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-gray);
  max-width: 65ch;
}

.note {
  font-size: 0.82rem;
  color: var(--color-gray);
  border-left: 3px solid var(--color-lake);
  background: rgba(29, 120, 116, 0.06);
  padding: 12px 16px;
  margin: 24px 0;
}

.data-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.875em;
}

.stat {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat--lg { font-size: clamp(2rem, 5vw, 3.25rem); }
.stat--accent { color: var(--color-accent); }
.stat--gold { color: var(--color-gold); }

.page-hero {
  position: relative;
  padding-block: clamp(48px, 8vw, 96px);
  border-bottom: 1px solid var(--color-border);
}

.page-hero__title {
  max-width: 16ch;
  margin-bottom: 0.2em;
}

.page-hero__intro {
  font-size: 1.1rem;
  color: var(--color-gray);
  max-width: 70ch;
}

/* ============ 布局容器 ============ */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 32px);
}

.section {
  padding-block: clamp(56px, 8vw, 96px);
}

.section--tight { padding-block: 32px; }
.section--alt { background: var(--color-white); }
.section--paper {
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.5vw, 32px);
}

.col-span-4 { grid-column: span 4; }
.col-span-5 { grid-column: span 5; }
.col-span-6 { grid-column: span 6; }
.col-span-7 { grid-column: span 7; }
.col-span-8 { grid-column: span 8; }
.col-span-9 { grid-column: span 9; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  line-height: 1;
  border-radius: 2px;
  border: 2px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--ease), border-color var(--ease), color var(--ease), transform var(--ease);
}

.btn:active {
  transform: translateY(1px);
}

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

.btn-accent:hover {
  background: #e45525;
  border-color: #e45525;
  color: var(--color-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

.btn--sm {
  padding: 8px 14px;
  font-size: 0.78rem;
}

/* ============ 头部 ============ */
.skip-link {
  position: fixed;
  inset-inline-start: 0;
  top: 0;
  z-index: 300;
  transform: translateY(-150%);
  background: var(--color-accent);
  color: var(--color-white);
  padding: 10px 18px;
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  border-radius: 0 0 4px 0;
  transition: transform var(--ease);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.12);
}

.header-shell {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 32px);
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: clamp(16px, 2vw, 24px);
  position: relative;
}

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: block;
  height: 3px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  z-index: 5;
  pointer-events: none;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-white);
  text-decoration: none;
  flex-shrink: 0;
}

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

.brand:hover .brand-emblem {
  background: var(--color-white);
  color: var(--color-primary);
}

.brand-emblem {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 34px;
  padding: 0 8px;
  background: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: -0.04em;
  -webkit-clip-path: polygon(10% 0, 100% 0, 88% 100%, 0 100%);
  clip-path: polygon(10% 0, 100% 0, 88% 100%, 0 100%);
  transition: background var(--ease), color var(--ease);
}

.brand-text {
  display: inline-flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: inherit;
}

.brand-wordmark {
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.65);
  white-space: nowrap;
}

.header-dateline {
  margin-right: auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.6);
  border-left: 1px solid rgba(255, 255, 255, 0.2);
  padding-left: 12px;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: inline-block;
  position: relative;
  padding: 8px 2px;
  margin: 0 10px;
  font-size: 0.86rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  height: 2px;
  width: 100%;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--ease), background var(--ease);
}

.nav-link:hover {
  color: var(--color-white);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

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

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--color-accent);
}

.nav-cta {
  margin-left: 8px;
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  border-radius: 2px;
  transition: border-color var(--ease), background var(--ease);
}

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

.nav-toggle-icon {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  position: relative;
  transition: background var(--ease);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--ease);
}

.nav-toggle-icon::before { top: -6px; }
.nav-toggle-icon::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background: transparent;
}

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

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

.nav-toggle-label {
  font-size: 0.75rem;
}

/* ============ 面包屑 ============ */
.breadcrumb-wrap {
  margin-bottom: 32px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  gap: 4px;
  margin: 0;
  padding: 0;
  font-size: 0.78rem;
  color: var(--color-gray);
  font-family: var(--font-mono);
}

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

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-inline: 8px;
  color: var(--color-border);
}

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

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

.breadcrumb [aria-current] {
  color: var(--color-gray);
}

/* ============ 卡片与状态 ============ */
.data-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--ease), box-shadow var(--ease), transform var(--ease);
}

.data-card:hover {
  border-left-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.data-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  line-height: 1;
  border-radius: 2px;
  white-space: nowrap;
}

.tag::before {
  content: "●";
  font-size: 0.6em;
  line-height: 1;
}

.tag-live {
  color: var(--color-accent);
  border-color: currentColor;
  background: rgba(255, 107, 53, 0.06);
}

.tag-live::before {
  animation: tag-pulse 2s ease-in-out infinite;
}

.tag-updated {
  color: var(--color-green);
  border-color: currentColor;
  background: rgba(95, 168, 0, 0.06);
}

.tag-gold {
  color: var(--color-gold);
  border-color: currentColor;
  background: rgba(212, 160, 23, 0.06);
}

@keyframes tag-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}

.glass-panel {
  background: rgba(255, 255, 255, 0.62);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow-md);
  padding: 24px;
}

.cta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 32px clamp(24px, 4vw, 48px);
  margin: 48px 0 0;
  background: linear-gradient(120deg, var(--color-primary) 0%, var(--color-lake) 100%);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.cta-bar h2,
.cta-bar h3 {
  color: inherit;
  margin-bottom: 0.3em;
}

.cta-bar p {
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--ease), gap var(--ease);
}

.link-arrow::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform var(--ease);
}

.link-arrow:hover {
  color: var(--color-accent);
  gap: 10px;
}

.link-arrow:hover::after {
  transform: translateX(2px);
}

.link-arrow--light {
  color: var(--color-white);
}

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

/* ============ 媒体容器 ============ */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, rgba(11, 79, 108, 0.14) 0%, rgba(29, 120, 116, 0.08) 100%);
}

.media-frame--rect { aspect-ratio: 4 / 3; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }

.media-frame--diagonal {
  -webkit-clip-path: polygon(0 0, 100% 0, calc(100% - 40px) 100%, 0 100%);
  clip-path: polygon(0 0, 100% 0, calc(100% - 40px) 100%, 0 100%);
}

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

.media-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 8px;
  color: rgba(11, 79, 108, 0.4);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  background:
    repeating-linear-gradient(45deg, rgba(11, 79, 108, 0.04) 0 8px, transparent 8px 16px);
}

/* ============ 页脚 ============ */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  position: relative;
}

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

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

.footer-lead {
  background: var(--color-accent);
  color: var(--color-white);
}

.footer-lead-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.footer-trust {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.86rem;
  letter-spacing: 0.03em;
  color: var(--color-white);
  margin: 0;
}

.footer-trust-mark {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.85;
}

.footer-main {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 32px;
  padding-top: 48px;
  padding-bottom: 48px;
}

.footer-brand-panel {
  grid-column: span 4;
}

.footer-column {
  grid-column: span 2;
}

.footer-contact {
  grid-column: span 2;
}

.footer-about {
  margin: 16px 0 12px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  max-width: 36ch;
}

.footer-heading {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-links {
  list-style: none;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color var(--ease), padding-left var(--ease);
}

.footer-links a:hover {
  color: var(--color-white);
  padding-left: 4px;
}

.footer-contact-list {
  list-style: none;
  margin: 0 0 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-contact-list li {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.72);
}

.footer-contact-list a {
  color: var(--color-white);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  transition: border-color var(--ease), color var(--ease);
}

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

.footer-note {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.5);
  margin: 0;
  border-left: 2px solid var(--color-accent);
  padding-left: 10px;
}

.footer-bottom {
  background: rgba(0, 0, 0, 0.15);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  padding-top: 16px;
  padding-bottom: 16px;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer-copyright,
.footer-icp {
  margin: 0;
}

.footer-icp {
  font-family: var(--font-mono);
}

/* ============ 响应式 ============ */
@media (max-width: 1023px) {
  .header-shell {
    min-height: 64px;
  }

  .header-dateline {
    display: none;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(11, 79, 108, 0.98);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    padding: 16px clamp(16px, 4vw, 32px) 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 16px 24px rgba(0, 0, 0, 0.15);
  }

  .site-nav[data-open] {
    display: flex;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 14px 2px;
    margin: 0;
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
  }

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

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

  .nav-cta {
    order: 99;
    margin: 16px 0 0;
    width: 100%;
  }

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

  .footer-brand-panel,
  .footer-column,
  .footer-contact {
    grid-column: span 6;
  }
}

@media (max-width: 767px) {
  .col-span-4,
  .col-span-5,
  .col-span-6,
  .col-span-7,
  .col-span-8,
  .col-span-9 {
    grid-column: span 12;
  }

  .footer-brand-panel,
  .footer-column,
  .footer-contact {
    grid-column: span 12;
  }

  .footer-main {
    gap: 28px;
  }

  .footer-lead-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 479px) {
  .brand-wordmark {
    display: none;
  }

  .brand-name {
    font-size: 1rem;
  }

  .header-shell {
    gap: 8px;
  }

  .nav-toggle {
    padding: 8px 10px;
  }
}

/* ============ 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;
  }

  .data-card:hover {
    transform: none;
  }

  .nav-toggle-icon,
  .nav-toggle-icon::before,
  .nav-toggle-icon::after {
    transition: none;
  }
}