:root {
  --color-primary: #0A1F44;
  --color-primary-dark: #061229;
  --color-primary-light: #122B5C;
  --color-accent: #FF6A00;
  --color-accent-hover: #E55E00;
  --color-teal: #00C2A8;
  --color-teal-deep: #0B4F3E;
  --color-wine: #4A0E1D;
  --color-bg-light: #F4F6FA;
  --color-text: #1A1A1A;
  --color-text-light: #FFFFFF;
  --color-text-muted: #6B7280;
  --color-border: #E5E7EB;
  --font-headline: 'Montserrat', 'Impact', 'Arial Black', sans-serif;
  --font-body: 'Open Sans', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-data: 'Roboto Mono', 'Courier New', monospace;
  --container: 1280px;
  --container-wide: 1600px;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.4s ease;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.04);
  --shadow-header: 0 8px 32px rgba(0,0,0,0.4);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  display: block;
}

#main-content {
  display: block;
  scroll-margin-top: 8rem;
}

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

a {
  color: var(--color-primary-light);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color var(--transition-fast);
}

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

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

::-moz-selection {
  background: var(--color-accent);
  color: #fff;
}

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

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.container-wide {
  width: min(100% - 2rem, var(--container-wide));
  margin-inline: auto;
}

.section {
  padding: 4.5rem 0;
}

.section-tight {
  padding: 2.5rem 0;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
}

.section-tag::before {
  content: '';
  width: 0.5em;
  height: 1.4em;
  background: var(--color-accent);
  display: inline-block;
}

.bg-primary {
  background-color: var(--color-primary);
  color: var(--color-text-light);
}

.bg-teal-deep {
  background-color: var(--color-teal-deep);
  color: var(--color-text-light);
}

.bg-wine {
  background-color: var(--color-wine);
  color: var(--color-text-light);
}

.bg-teal-deep a,
.bg-wine a,
.bg-primary a {
  color: var(--color-text-light);
}

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  line-height: 1;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 106, 0, 0.25);
}

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

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn-teal {
  background: var(--color-teal);
  color: var(--color-primary-dark);
}

.btn-teal:hover {
  background: var(--color-teal-deep);
  color: #fff;
}

/* 面包屑 */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 2rem;
}

.breadcrumbs a {
  color: var(--color-text-muted);
  text-decoration: none;
}

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

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

/* 卡片基类 */
.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.08);
  border-color: rgba(255, 106, 0, 0.4);
}

.card--data {
  font-family: var(--font-data);
  border-top: 4px solid var(--color-teal);
}

.card--compact {
  padding: 1rem 1.25rem;
}

/* 数据文本 */
.text-data {
  font-family: var(--font-data);
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.text-display {
  font-family: var(--font-headline);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.text-headline {
  font-family: var(--font-headline);
  font-weight: 700;
  line-height: 1.2;
}

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

.data-highlight {
  color: var(--color-teal);
  font-family: var(--font-data);
  font-weight: 500;
}

/* 图片容器基类 */
.img-container {
  position: relative;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
  overflow: hidden;
  border-radius: 4px;
}

.img-container::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(-45deg, transparent 0px, transparent 12px, rgba(255, 255, 255, 0.03) 12px, rgba(255, 255, 255, 0.03) 24px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.img-container img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 头部样式 */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--color-accent);
  z-index: 200;
  pointer-events: none;
  transition: width 0.1s linear;
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 150;
  background: transparent;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: background-color var(--transition-smooth), box-shadow var(--transition-smooth);
}

.site-header[data-scrolled] {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-header);
  border-bottom-color: transparent;
}

.header-masthead {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.4rem 0;
  transition: padding var(--transition-fast);
}

.site-header[data-scrolled] .header-masthead {
  padding: 0.8rem 0;
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--color-accent);
  color: #fff;
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1rem;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  display: flex;
  flex-direction: column;
}

.brand-slogan {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--color-teal);
  text-transform: uppercase;
  margin-top: 0.2rem;
}

.masthead-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.85rem;
}

.meta-trust {
  font-family: var(--font-data);
  color: var(--color-teal);
  border-left: 2px solid rgba(0, 194, 168, 0.4);
  padding-left: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.meta-trust::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-teal);
  box-shadow: 0 0 0 0 rgba(0, 194, 168, 0.6);
  animation: pulse-dot 2s infinite;
}

.search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 2px;
  color: var(--color-text-light);
  font-size: 0.8rem;
  font-family: var(--font-headline);
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.search-trigger::before {
  content: '';
  width: 0.7em;
  height: 0.7em;
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  position: relative;
}

.search-trigger::after {
  content: '';
  width: 2px;
  height: 0.5em;
  background: var(--color-accent);
  transform: rotate(45deg);
  position: relative;
  top: 0.25em;
  left: -0.15em;
}

.search-trigger:hover {
  border-color: var(--color-accent);
  background: rgba(255, 106, 0, 0.1);
  color: #fff;
}

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

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

.nav-list {
  display: flex;
  list-style: none;
  gap: 0;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: rgba(255, 255, 255, 0.75);
  padding: 1.1rem 1.2rem;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  background: rgba(255, 255, 255, 0.03);
}

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

.nav-toggle {
  display: none;
}

/* 页脚样式 */
.site-footer {
  position: relative;
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.75);
  margin-top: 4rem;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-teal) 50%, transparent 100%);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding: 3.5rem 0 2rem;
}

.footer-brand .brand-mark {
  margin-bottom: 1rem;
}

.footer-mark {
  width: 56px;
  height: 56px;
  font-size: 1.2rem;
}

.footer-desc {
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6);
  max-width: 30ch;
  margin-bottom: 1rem;
}

.footer-trust {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-teal);
  border-left: 2px solid var(--color-teal);
  padding-left: 0.75rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.9rem;
}

.footer-heading {
  font-family: var(--font-headline);
  font-size: 0.9rem;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  padding: 0.15rem 0;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast), padding-left var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.25rem 0 1.5rem;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.4);
  font-family: var(--font-data);
}

.footer-bottom .icp {
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom .address {
  max-width: 40ch;
}

.btn-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 180;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: none;
  border-radius: 2px;
  background: var(--color-accent);
  color: #fff;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.btn-to-top:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 8px 24px rgba(255, 106, 0, 0.4);
}

.btn-to-top-icon {
  font-size: 1.2rem;
  line-height: 1;
}

/* 响应式布局 */
@media (max-width: 1024px) {
  .header-masthead {
    flex-wrap: wrap;
    gap: 1rem;
  }

  .masthead-meta {
    width: 100%;
    justify-content: space-between;
  }

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

@media (max-width: 768px) {
  .container,
  .container-wide {
    width: min(100% - 1.5rem, 100%);
  }

  .brand-name {
    font-size: 1.3rem;
  }

  .brand-slogan {
    font-size: 0.6rem;
  }

  .meta-trust {
    font-size: 0.7rem;
    border-left: none;
    padding-left: 0;
  }

  .search-trigger {
    padding: 0.3rem 0.6rem;
    font-size: 0.7rem;
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: transparent;
    border: none;
    padding: 0.75rem 0;
    cursor: pointer;
    margin-left: auto;
  }

  .toggle-bar {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-light);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  .nav-toggle.is-active {
    position: relative;
    z-index: 200;
  }

  .nav-toggle.is-active .toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle.is-active .toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.is-active .toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-primary-dark);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: 2px solid var(--color-accent);
    padding: 0.5rem 0 1rem;
    box-shadow: var(--shadow-header);
  }

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

  .nav-list {
    flex-direction: column;
  }

  .nav-link {
    padding: 0.9rem 1.5rem;
    border-bottom: none;
    border-left: 3px solid transparent;
    color: rgba(255, 255, 255, 0.85);
  }

  .nav-link:hover,
  .nav-link[aria-current="page"] {
    border-left-color: var(--color-accent);
    background: rgba(255, 255, 255, 0.03);
    color: var(--color-accent);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem 0 1.5rem;
  }

  .footer-desc {
    max-width: 100%;
  }

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

  .btn-to-top {
    width: 38px;
    height: 38px;
    right: 1rem;
    bottom: 1rem;
  }
}

@media (min-width: 769px) {
  .site-nav {
    display: flex !important;
  }
}

/* 无障碍：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;
  }

  html {
    scroll-behavior: auto;
  }

  .meta-trust::before {
    animation: none;
  }
}

@keyframes pulse-dot {
  0% {
    box-shadow: 0 0 0 0 rgba(0, 194, 168, 0.5);
  }
  70% {
    box-shadow: 0 0 0 6px rgba(0, 194, 168, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(0, 194, 168, 0);
  }
}