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

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

body {
  min-height: 100vh;
  line-height: 1.6;
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 400;
  background-color: #0D0D1A;
  color: #FFFFFF;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul, ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s ease, background-color 0.25s ease, opacity 0.25s ease;
}

button {
  font: inherit;
  color: inherit;
  border: none;
  background: none;
  cursor: pointer;
  transition: background-color 0.25s ease, opacity 0.25s ease;
}

:focus-visible {
  outline: 2px solid #FFD700;
  outline-offset: 3px;
  border-radius: 2px;
}

@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;
  }
}

/* === CSS VARIABLES === */
:root {
  --color-primary: #0B1D3A;
  --color-accent: #D32F2F;
  --color-gold: #FFD700;
  --color-bg-deep: #0D0D1A;
  --color-card-bg: #1E1E3A;
  --color-white: #FFFFFF;
  --color-secondary-text: #A0A0B0;
  --color-data-green: #4CAF50;
  --color-warning-orange: #FF9800;
  --color-glass: rgba(255, 255, 255, 0.08);
  --font-heading: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'Microsoft YaHei', -apple-system, sans-serif;
  --font-data: 'Fira Code', 'Menlo', 'Consolas', monospace;
  --max-width: 1360px;
  --header-height: 68px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  --border-radius: 6px;
}

/* === SKIP LINK === */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--spacing-md);
  z-index: 10000;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-gold);
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-gold);
  outline-offset: 2px;
}

/* === HEADER === */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: transparent;
  transition: background-color 0.4s ease, box-shadow 0.4s ease;
  display: flex;
  align-items: center;
}

.site-header[data-scrolled] {
  background-color: var(--color-primary);
  box-shadow: 0 2px 24px rgba(0, 0, 0, 0.5);
}

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

/* Brand */
.header-brand {
  flex-shrink: 0;
}

.brand-logo {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: 0.02em;
  color: var(--color-white);
  transition: color 0.25s ease;
}

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

/* Navigation */
.header-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.925rem;
  color: var(--color-white);
  border-bottom: 2px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
  white-space: nowrap;
}

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

.nav-link[aria-current="page"] {
  color: var(--color-gold);
  border-bottom-color: var(--color-gold);
  font-weight: 700;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-size: 1.25rem;
  color: var(--color-white);
  border-radius: var(--border-radius);
  background-color: var(--color-glass);
  transition: background-color 0.25s ease, color 0.25s ease;
}

.action-btn:hover {
  background-color: rgba(255, 255, 255, 0.15);
  color: var(--color-gold);
}

/* Compare Button */
.btn-compare {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.25rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--color-gold);
  background-color: var(--color-accent);
  border-radius: var(--border-radius);
  transition: background-color 0.25s ease, transform 0.2s ease, box-shadow 0.25s ease;
  white-space: nowrap;
  letter-spacing: 0.04em;
}

.btn-compare:hover {
  background-color: #B71C1C;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(211, 47, 47, 0.4);
  color: var(--color-gold);
}

/* Nav Toggle (Mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  padding: 8px;
  border-radius: var(--border-radius);
  background-color: var(--color-glass);
  transition: background-color 0.25s ease;
}

.nav-toggle:hover {
  background-color: rgba(255, 255, 255, 0.15);
}

.toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 1px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Mobile Navigation States */
@media (max-width: 860px) {
  .header-inner {
    padding: 0 var(--spacing-md);
  }

  .brand-logo {
    font-size: 1.25rem;
  }

  .nav-toggle {
    display: flex;
  }

  .header-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    bottom: 0;
    width: 300px;
    max-width: 80vw;
    background-color: var(--color-primary);
    border-left: 1px solid var(--color-glass);
    padding: var(--spacing-lg) var(--spacing-md);
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
    z-index: 999;
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.5);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-xs);
  }

  .nav-link {
    font-size: 1.05rem;
    padding: var(--spacing-md) var(--spacing-sm);
    border-bottom: 1px solid var(--color-glass);
  }

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

  .header-actions .action-btn:not(:last-of-type) {
    display: none;
  }

  .header-actions .btn-compare {
    font-size: 0.8rem;
    padding: 0.4rem 0.9rem;
  }

  /* Toggle open bars animation */
  .site-header:has([data-nav-toggle][aria-expanded="true"]) .toggle-bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .site-header:has([data-nav-toggle][aria-expanded="true"]) .toggle-bar:nth-child(2) {
    opacity: 0;
  }
  .site-header:has([data-nav-toggle][aria-expanded="true"]) .toggle-bar:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
}

@media (max-width: 480px) {
  .header-nav {
    width: 100%;
    max-width: 100%;
    border-left: none;
  }
}

@media (min-width: 861px) {
  .header-nav {
    position: relative;
    top: auto;
    right: auto;
    bottom: auto;
    width: auto;
    transform: none;
    background: none;
    border-left: none;
    box-shadow: none;
    padding: 0;
    overflow: visible;
  }

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

/* === FOOTER === */
.site-footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
  margin-top: var(--spacing-xl);
  border-top: 2px solid var(--color-glass);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--spacing-xl) var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-glass);
}

.footer-logo {
  display: block;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--color-gold);
  margin-bottom: var(--spacing-sm);
}

.footer-trust {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-secondary-text);
  max-width: 380px;
}

.footer-heading {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--spacing-md);
  color: var(--color-white);
  border-left: 3px solid var(--color-gold);
  padding-left: var(--spacing-sm);
}

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

.contact-link,
.legal-link {
  font-size: 0.9rem;
  color: var(--color-secondary-text);
  transition: color 0.25s ease;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.contact-link:hover,
.legal-link:hover {
  color: var(--color-gold);
}

.contact-addr {
  font-size: 0.9rem;
  color: var(--color-secondary-text);
  font-style: normal;
}

.footer-icp {
  margin-top: var(--spacing-md);
  font-size: 0.8rem;
  color: var(--color-secondary-text);
  letter-spacing: 0.03em;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: var(--spacing-md) auto 0;
  text-align: center;
}

.footer-copy {
  font-size: 0.825rem;
  color: var(--color-secondary-text);
}

@media (max-width: 860px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
  .footer-trust {
    max-width: 100%;
  }
}

@media (max-width: 540px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  .site-footer {
    padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
  }
}

/* === BACK TO TOP === */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 900;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 1.5rem;
  border-radius: 50%;
  box-shadow: 0 4px 20px rgba(211, 47, 47, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, background-color 0.25s ease;
  pointer-events: none;
}

.back-to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background-color: #B71C1C;
  transform: translateY(-3px);
  box-shadow: 0 6px 28px rgba(211, 47, 47, 0.6);
}

.back-to-top:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .back-to-top {
    transition: opacity 0.01ms, visibility 0.01ms;
  }
}

/* === SCROLL PROGRESS === */
.scroll-progress {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  height: 3px;
  z-index: 999;
  background-color: transparent;
  pointer-events: none;
}

.scroll-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  transition: width 0.1s linear;
}

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

/* === UTILITY === */
.main-content {
  min-height: 60vh;
  padding-top: var(--header-height);
}

/* === IMAGE CONTAINER BASE === */
.img-container {
  position: relative;
  display: block;
  width: 100%;
  background-color: var(--color-card-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.img-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

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

.img-container .img-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  font-family: var(--font-data);
  font-size: 0.875rem;
  color: var(--color-secondary-text);
  background: linear-gradient(135deg, var(--color-card-bg), var(--color-primary));
}

/* === RESPONSIVE GRID HELPERS === */
.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: var(--spacing-lg);
}

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

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

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

@media (max-width: 860px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 540px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* === CONTENT CONTAINER === */
.content-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

@media (max-width: 540px) {
  .content-container {
    padding: 0 var(--spacing-md);
  }
}

/* === SECTION THEME BAND === */
.theme-band {
  padding: var(--spacing-xl) 0;
  position: relative;
}

.theme-band::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  max-width: var(--max-width);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), var(--color-gold), transparent);
  opacity: 0.4;
}

/* === DATA LABEL === */
.data-label {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-secondary-text);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.data-value {
  font-family: var(--font-data);
  font-weight: 600;
  color: var(--color-white);
}

/* === CARD === */
.card {
  background-color: var(--color-card-bg);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  border: 1px solid var(--color-glass);
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
  border-color: rgba(255, 215, 0, 0.3);
}

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

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.4rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.925rem;
  border-radius: var(--border-radius);
  transition: background-color 0.25s ease, transform 0.2s ease, box-shadow 0.25s ease;
  cursor: pointer;
}

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

.btn-primary:hover {
  background-color: #B71C1C;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(211, 47, 47, 0.35);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-white);
  border: 1px solid var(--color-glass);
}

.btn-outline:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
  background-color: rgba(255, 215, 0, 0.06);
}

/* === BREADCRUMB === */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) 0;
  font-size: 0.85rem;
  color: var(--color-secondary-text);
}

.breadcrumb a {
  color: var(--color-secondary-text);
  transition: color 0.25s ease;
}

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

.breadcrumb .separator {
  color: var(--color-secondary-text);
  opacity: 0.5;
  margin: 0 var(--spacing-xs);
}

.breadcrumb .current {
  color: var(--color-white);
  font-weight: 600;
}

/* === SECTION TITLE === */
.section-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 2rem;
  line-height: 1.2;
  color: var(--color-white);
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.01em;
}

.section-title .highlight {
  color: var(--color-gold);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-secondary-text);
  max-width: 640px;
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

@media (max-width: 540px) {
  .section-title {
    font-size: 1.5rem;
  }
  .section-subtitle {
    font-size: 0.95rem;
  }
}

/* === TAG === */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.7rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tag-red {
  background-color: rgba(211, 47, 47, 0.2);
  color: var(--color-accent);
  border: 1px solid rgba(211, 47, 47, 0.3);
}

.tag-gold {
  background-color: rgba(255, 215, 0, 0.15);
  color: var(--color-gold);
  border: 1px solid rgba(255, 215, 0, 0.25);
}

.tag-green {
  background-color: rgba(76, 175, 80, 0.15);
  color: var(--color-data-green);
  border: 1px solid rgba(76, 175, 80, 0.25);
}

/* === GLASS PANEL === */
.glass-panel {
  background-color: var(--color-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--border-radius);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: var(--spacing-lg);
}

@media (prefers-reduced-motion: reduce) {
  .glass-panel {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}

/* === DATA TABLE BASE === */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-data);
  font-size: 0.9rem;
}

.data-table th {
  text-align: left;
  padding: var(--spacing-sm) var(--spacing-md);
  font-weight: 600;
  color: var(--color-gold);
  border-bottom: 2px solid var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.8rem;
}

.data-table td {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--color-glass);
  color: var(--color-white);
}

.data-table tr:hover td {
  background-color: rgba(255, 255, 255, 0.03);
}

/* === STAT BLOCK === */
.stat-block {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.stat-value {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 1.75rem;
  color: var(--color-white);
  line-height: 1.1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--color-secondary-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value.accent {
  color: var(--color-accent);
}

.stat-value.gold {
  color: var(--color-gold);
}

.stat-value.green {
  color: var(--color-data-green);
}

/* === DIVIDER === */
.divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), var(--color-gold), transparent);
  opacity: 0.3;
  margin: var(--spacing-lg) 0;
}