:root {
  --color-primary-red: #E63946;
  --color-primary-blue: #1D3557;
  --color-gold: #F4A261;
  --color-dark-bg: #0B1A2A;
  --color-light-bg: #F1FAEE;
  --color-text-light: #FFFFFF;
  --color-text-dark: #0B1A2A;
  --color-accent-gradient: linear-gradient(135deg, #E63946, #1D3557);
  --font-heading: Impact, 'Arial Black', sans-serif;
  --font-body: Georgia, 'Times New Roman', serif;
  --fs-h1: 3.5rem;
  --fs-h2: 2.5rem;
  --fs-h3: 1.8rem;
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --header-height: 64px;
  --header-scrolled-height: 48px;
  --max-width: 1200px;
  --border-radius: 4px;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.25);
  --shadow-glow-gold: 0 0 12px rgba(244, 162, 97, 0.4);
  --transition-base: 0.25s ease;
  --transition-smooth: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--color-text-dark);
  background-color: var(--color-light-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

a {
  color: var(--color-primary-red);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

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

ul, ol {
  list-style: none;
}

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

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

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--spacing-md);
  background: var(--color-gold);
  color: var(--color-text-dark);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-heading);
  font-size: var(--fs-small);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  z-index: 10000;
  transition: top var(--transition-base);
  border-radius: 0 0 var(--border-radius) var(--border-radius);
}

.skip-link:focus {
  top: 0;
  outline: none;
  box-shadow: var(--shadow-glow-gold);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(11, 26, 42, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(244, 162, 97, 0.15);
  transition: height var(--transition-smooth), background var(--transition-smooth), box-shadow var(--transition-smooth);
  box-shadow: 0 2px 24px rgba(0, 0, 0, 0.3);
}

.site-header[data-scrolled] {
  height: var(--header-scrolled-height);
  background: rgba(11, 26, 42, 0.96);
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.4);
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  height: 100%;
  gap: var(--spacing-md);
}

.header__brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.header__logo {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-shadow: 0 0 16px rgba(244, 162, 97, 0.25);
  transition: text-shadow var(--transition-base);
}

.header__logo:hover {
  color: var(--color-gold);
  text-shadow: 0 0 24px rgba(244, 162, 97, 0.5);
}

.header__divider {
  color: var(--color-primary-red);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  opacity: 0.6;
  padding: 0 var(--spacing-xs);
}

.header__slogan {
  font-family: var(--font-body);
  font-size: var(--fs-small);
  color: var(--color-text-light);
  opacity: 0.75;
  white-space: nowrap;
  letter-spacing: 0.04em;
}

.header__nav {
  display: flex;
  align-items: center;
}

.header__nav-list {
  display: flex;
  gap: var(--spacing-xs);
}

.header__nav-list a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-heading);
  font-size: var(--fs-small);
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-base), border-color var(--transition-base), background var(--transition-base);
  white-space: nowrap;
}

.header__nav-list a:hover {
  color: var(--color-primary-red);
  border-bottom-color: var(--color-primary-red);
}

.header__nav-list a[aria-current="page"] {
  color: var(--color-gold);
  border-bottom-color: var(--color-gold);
  text-shadow: 0 0 8px rgba(244, 162, 97, 0.2);
}

.header__aside {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.header__phone {
  font-family: var(--font-heading);
  font-size: var(--fs-small);
  color: var(--color-text-light);
  padding: var(--spacing-xs) var(--spacing-md);
  border: 1px solid var(--color-gold);
  border-radius: var(--border-radius);
  letter-spacing: 0.04em;
  transition: background var(--transition-base), color var(--transition-base), box-shadow var(--transition-base);
  white-space: nowrap;
}

.header__phone:hover {
  background: var(--color-gold);
  color: var(--color-text-dark);
  box-shadow: var(--shadow-glow-gold);
}

.header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  padding: 6px;
  background: transparent;
  border: 1px solid rgba(244, 162, 97, 0.3);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: border-color var(--transition-base);
}

.header__toggle:hover {
  border-color: var(--color-gold);
}

.toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-light);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

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

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

/* Header Progress Bar */
.header__progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--color-primary-red), var(--color-gold));
  transition: width 0.1s linear;
  z-index: 2;
}

@media (prefers-reduced-motion: reduce) {
  .header__progress {
    transition: none;
  }
}

/* Footer */
.site-footer {
  background: var(--color-dark-bg);
  color: var(--color-text-light);
  padding: var(--spacing-2xl) var(--spacing-lg) var(--spacing-lg);
  border-top: 3px solid transparent;
  border-image: linear-gradient(90deg, var(--color-primary-red), var(--color-primary-blue), var(--color-gold)) 1;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1.2fr;
  gap: var(--spacing-xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer__logo {
  font-family: var(--font-heading);
  font-size: 2rem;
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-shadow: 0 0 20px rgba(244, 162, 97, 0.2);
  display: inline-block;
  margin-bottom: var(--spacing-xs);
}

.footer__logo:hover {
  color: var(--color-gold);
  text-shadow: 0 0 30px rgba(244, 162, 97, 0.4);
}

.footer__slogan {
  font-family: var(--font-heading);
  font-size: var(--fs-h3);
  color: var(--color-primary-red);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-md);
  opacity: 0.9;
}

.footer__trust {
  font-size: var(--fs-small);
  line-height: 1.6;
  opacity: 0.65;
  max-width: 32em;
}

.footer__heading {
  font-family: var(--font-heading);
  font-size: var(--fs-body);
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-primary-red);
  display: inline-block;
}

.footer__link-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer__link-list a {
  color: var(--color-text-light);
  opacity: 0.7;
  font-size: var(--fs-small);
  transition: opacity var(--transition-base), color var(--transition-base);
  padding: var(--spacing-xs) 0;
  display: inline-block;
}

.footer__link-list a:hover {
  opacity: 1;
  color: var(--color-gold);
}

.footer__contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer__contact-list li {
  font-size: var(--fs-small);
  opacity: 0.7;
  line-height: 1.6;
}

.footer__contact-list a {
  color: var(--color-text-light);
  opacity: 0.8;
  transition: color var(--transition-base);
}

.footer__contact-list a:hover {
  color: var(--color-gold);
  opacity: 1;
}

.footer__divider {
  max-width: var(--max-width);
  margin: var(--spacing-xl) auto var(--spacing-lg);
  height: 1px;
  background: linear-gradient(90deg, var(--color-primary-red), var(--color-primary-blue), var(--color-gold), var(--color-primary-blue), var(--color-primary-red));
  opacity: 0.4;
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: var(--spacing-md);
  font-size: var(--fs-small);
  opacity: 0.6;
}

.footer__copyright,
.footer__icp {
  font-family: var(--font-body);
  letter-spacing: 0.02em;
}

/* Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-heading);
  font-size: var(--fs-small);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: var(--border-radius);
  transition: background var(--transition-base), color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
  cursor: pointer;
  border: none;
  line-height: 1.4;
}

.btn--primary {
  background: var(--color-accent-gradient);
  color: var(--color-text-light);
  box-shadow: 0 2px 12px rgba(230, 57, 70, 0.3);
}

.btn--primary:hover {
  box-shadow: 0 4px 20px rgba(230, 57, 70, 0.5);
  transform: translateY(-1px);
  color: var(--color-text-light);
}

.btn--gold {
  background: var(--color-gold);
  color: var(--color-text-dark);
  box-shadow: 0 2px 12px rgba(244, 162, 97, 0.3);
}

.btn--gold:hover {
  box-shadow: 0 4px 20px rgba(244, 162, 97, 0.5);
  transform: translateY(-1px);
  color: var(--color-text-dark);
}

.btn--outline {
  background: transparent;
  color: var(--color-text-light);
  border: 1px solid var(--color-primary-red);
}

.btn--outline:hover {
  background: var(--color-primary-red);
  color: var(--color-text-light);
  transform: translateY(-1px);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) 0;
  font-size: var(--fs-small);
  font-family: var(--font-body);
}

.breadcrumb a {
  color: var(--color-primary-blue);
  opacity: 0.7;
  transition: opacity var(--transition-base);
}

.breadcrumb a:hover {
  opacity: 1;
  color: var(--color-primary-red);
}

.breadcrumb [aria-current="page"] {
  color: var(--color-text-dark);
  opacity: 0.9;
  font-weight: 700;
}

.breadcrumb__sep {
  color: var(--color-primary-red);
  opacity: 0.4;
  margin: 0 var(--spacing-xs);
}

/* Card */
.card {
  background: var(--color-text-light);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.card__header {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-accent-gradient);
  color: var(--color-text-light);
}

.card__body {
  padding: var(--spacing-lg);
}

.card__footer {
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid rgba(13, 27, 42, 0.08);
}

/* Section Title */
.section-title {
  font-family: var(--font-heading);
  font-size: var(--fs-h2);
  color: var(--color-primary-blue);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  position: relative;
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary-red), var(--color-gold));
  border-radius: 2px;
}

.section-title--center {
  text-align: center;
}

.section-title--center::after {
  left: 50%;
  transform: translateX(-50%);
}

/* Image Placeholder */
.image-placeholder {
  position: relative;
  overflow: hidden;
  background: var(--color-dark-bg);
  background-image: linear-gradient(135deg, rgba(230, 57, 70, 0.08), rgba(29, 53, 87, 0.12));
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  aspect-ratio: 16 / 9;
}

.image-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-smooth);
}

.image-placeholder:hover img {
  transform: scale(1.03);
}

/* Data Card (用于数据可视化卡片) */
.data-card {
  background: var(--color-dark-bg);
  border: 1px solid rgba(244, 162, 97, 0.2);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  color: var(--color-text-light);
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.data-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary-red), var(--color-gold));
  opacity: 0.6;
}

.data-card:hover {
  border-color: var(--color-gold);
  box-shadow: 0 0 24px rgba(244, 162, 97, 0.15);
}

.data-card__value {
  font-family: var(--font-heading);
  font-size: var(--fs-h1);
  color: var(--color-gold);
  line-height: 1;
  text-shadow: 0 0 20px rgba(244, 162, 97, 0.15);
}

.data-card__label {
  font-family: var(--font-body);
  font-size: var(--fs-small);
  opacity: 0.7;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: var(--spacing-xs);
}

/* Responsive */
@media (max-width: 1024px) {
  .header__nav-list {
    gap: 0;
  }

  .header__nav-list a {
    padding: var(--spacing-sm) var(--spacing-sm);
    font-size: 0.75rem;
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
  }

  .footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  :root {
    --fs-h1: 2.2rem;
    --fs-h2: 1.8rem;
    --fs-h3: 1.4rem;
    --header-height: 56px;
    --header-scrolled-height: 48px;
  }

  .header__container {
    padding: 0 var(--spacing-md);
  }

  .header__slogan {
    display: none;
  }

  .header__divider {
    display: none;
  }

  .header__aside {
    display: none;
  }

  .header__toggle {
    display: flex;
  }

  .header__nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(11, 26, 42, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: stretch;
    padding: var(--spacing-lg) var(--spacing-md);
    transform: translateX(100%);
    transition: transform var(--transition-smooth);
    z-index: 999;
    overflow-y: auto;
  }

  .site-header[data-scrolled] .header__nav {
    top: var(--header-scrolled-height);
  }

  .header__nav[data-open] {
    transform: translateX(0);
  }

  .header__nav-list {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .header__nav-list a {
    font-size: var(--fs-body);
    padding: var(--spacing-md);
    border-bottom: 1px solid rgba(244, 162, 97, 0.1);
    text-align: center;
  }

  .header__nav-list a[aria-current="page"] {
    background: rgba(230, 57, 70, 0.12);
    border-bottom-color: var(--color-gold);
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    text-align: center;
  }

  .footer__heading {
    display: block;
    text-align: center;
  }

  .footer__link-list {
    align-items: center;
  }

  .footer__contact-list {
    align-items: center;
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .section-title::after {
    left: 50%;
    transform: translateX(-50%);
  }
}

@media (max-width: 480px) {
  :root {
    --fs-h1: 1.8rem;
    --fs-h2: 1.5rem;
    --fs-h3: 1.2rem;
    --spacing-lg: 1.2rem;
    --spacing-xl: 2rem;
  }

  .header__logo {
    font-size: 1.2rem;
  }

  .header__toggle {
    width: 36px;
    height: 36px;
  }

  .toggle__bar {
    width: 20px;
  }

  .site-footer {
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-md);
  }
}