/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; border: 0; font: inherit; vertical-align: baseline; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { min-height: 100vh; line-height: 1.6; -webkit-font-smoothing: antialiased; }
img, picture, video, canvas, svg { display: block; max-width: 100%; }
ul, ol { list-style: none; }
a { text-decoration: none; color: inherit; }
button { background: none; cursor: pointer; font: inherit; color: inherit; }
table { border-collapse: collapse; border-spacing: 0; }
input, textarea, select { font: inherit; }
:focus-visible { outline: 2px solid var(--color-gold); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; } }

/* ===== CSS VARIABLES ===== */
:root {
  --color-red: #C41030;
  --color-blue-dark: #1A2A4A;
  --color-gold: #F1C40F;
  --color-gray-rock: #8A9BA8;
  --color-cream: #F4F1EA;
  --color-green: #2E8B57;
  --color-terracotta: #D35400;
  --color-blue-deep: #0B1A33;
  --color-white: #FFFFFF;
  --color-black: #111111;
  --font-heading: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', sans-serif;
  --font-body: 'Georgia', 'Songti SC', 'Times New Roman', serif;
  --font-mono: 'Consolas', 'Courier New', monospace;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 50px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.25);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.35);
  --max-width: 1200px;
  --header-height: 80px;
}

/* ===== CHINESE TYPOGRAPHY ===== */
body {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-blue-dark);
  background: var(--color-cream);
  line-height: 1.6;
}
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-blue-dark);
}
h1 { font-size: 6rem; letter-spacing: -0.02em; }
h2 { font-size: 2.5rem; letter-spacing: -0.01em; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.125rem; }
p { margin-bottom: var(--space-md); }
small, .text-small { font-size: 0.75rem; }
a { color: var(--color-red); transition: color 0.2s; }
a:hover { color: var(--color-gold); }

/* ===== SKIP LINK ===== */
.skip-link {
  position: fixed;
  top: -100%;
  left: var(--space-md);
  z-index: 2000;
  background: var(--color-red);
  color: var(--color-white);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.875rem;
  transition: top 0.2s;
}
.skip-link:focus {
  top: var(--space-md);
}

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: var(--space-sm);
  left: var(--space-sm);
  right: var(--space-sm);
  z-index: 1000;
  pointer-events: none;
}
.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-blue-dark);
  border-radius: var(--radius-lg);
  padding: 0.4rem 1.5rem;
  box-shadow: var(--shadow-md);
  pointer-events: auto;
  border: 1px solid rgba(241, 196, 15, 0.15);
  position: relative;
  min-height: 64px;
}
.site-header-inner::after {
  content: '';
  position: absolute;
  right: 2rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--color-gold), transparent);
  opacity: 0.3;
  pointer-events: none;
}
.site-logo {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: 0.04em;
  flex-shrink: 0;
  transition: opacity 0.2s;
}
.site-logo:hover { opacity: 0.85; color: var(--color-white); }
.logo-accent { color: var(--color-red); }

/* Navigation */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.nav-link {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-white);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  transition: background 0.2s, color 0.2s;
  letter-spacing: 0.02em;
  position: relative;
}
.nav-link:hover {
  background: rgba(241, 196, 15, 0.12);
  color: var(--color-gold);
}
.nav-link[aria-current="page"] {
  color: var(--color-gold);
}
.nav-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: var(--space-md);
  right: var(--space-md);
  height: 2px;
  background: var(--color-gold);
  border-radius: 1px;
}

/* CTA Button */
.btn-cta {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-white);
  background: var(--color-red);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gold);
  transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.btn-cta:hover {
  background: #a30d26;
  box-shadow: 0 0 20px rgba(241, 196, 15, 0.25);
  color: var(--color-white);
  transform: scale(1.02);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-sm);
  gap: 5px;
  padding: 8px;
  transition: border-color 0.2s;
}
.nav-toggle:hover { border-color: var(--color-gold); }
.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-white);
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) 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(-7px) rotate(-45deg);
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--color-blue-dark);
  color: var(--color-white);
  padding: var(--space-xl) var(--space-md) var(--space-lg);
  margin-top: var(--space-2xl);
  border-top: 2px solid var(--color-gold);
  position: relative;
}
.site-footer::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.5fr;
  gap: var(--space-xl);
  align-items: start;
}
.footer-brand { display: flex; flex-direction: column; gap: var(--space-sm); }
.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: 0.04em;
}
.footer-logo:hover { color: var(--color-white); opacity: 0.85; }
.footer-tagline {
  font-size: 0.875rem;
  color: var(--color-gray-rock);
  margin-bottom: 0;
  font-style: italic;
}
.footer-links { display: flex; flex-direction: column; gap: var(--space-sm); }
.footer-links-title {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-gold);
  margin-bottom: var(--space-xs);
}
.footer-link {
  font-size: 0.9rem;
  color: var(--color-gray-rock);
  transition: color 0.2s, padding-left 0.2s;
}
.footer-link:hover { color: var(--color-gold); padding-left: 4px; }
.footer-contact { display: flex; flex-direction: column; gap: var(--space-sm); }
.footer-contact-title {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-gold);
  margin-bottom: var(--space-xs);
}
.footer-contact-item {
  font-size: 0.875rem;
  color: var(--color-gray-rock);
  display: block;
}
.footer-contact-item:first-of-type { color: var(--color-white); }
.footer-contact-note {
  font-size: 0.75rem;
  color: var(--color-gray-rock);
  font-style: italic;
  margin-top: var(--space-sm);
  margin-bottom: 0;
}
.footer-bottom {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(138, 155, 168, 0.2);
  margin-top: var(--space-md);
  font-size: 0.75rem;
  color: var(--color-gray-rock);
}
.footer-icp { letter-spacing: 0.02em; }
.footer-copyright { letter-spacing: 0.02em; }

/* ===== GENERAL BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius-sm);
  transition: background 0.2s, color 0.2s, box-shadow 0.2s, transform 0.2s;
  cursor: pointer;
  border: 1px solid transparent;
  line-height: 1.4;
}
.btn-primary {
  background: var(--color-red);
  color: var(--color-white);
  border-color: var(--color-red);
}
.btn-primary:hover {
  background: #a30d26;
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(196, 16, 48, 0.3);
}
.btn-outline {
  background: transparent;
  color: var(--color-gold);
  border-color: var(--color-gold);
}
.btn-outline:hover {
  background: var(--color-gold);
  color: var(--color-blue-dark);
}

/* ===== BREADCRUMB ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  color: var(--color-gray-rock);
  padding: var(--space-md) 0;
}
.breadcrumb a { color: var(--color-blue-dark); font-weight: 500; }
.breadcrumb a:hover { color: var(--color-red); }
.breadcrumb [aria-current="page"] { color: var(--color-red); font-weight: 600; }
.breadcrumb-sep { color: var(--color-gray-rock); margin: 0 var(--space-xs); user-select: none; }

/* ===== CONTAINER ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  width: 100%;
}

/* ===== GRID ===== */
.grid {
  display: grid;
  gap: var(--space-lg);
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* ===== CARD ===== */
.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s, transform 0.3s;
  border: 1px solid rgba(138, 155, 168, 0.15);
}
.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* ===== IMAGE PLACEHOLDER ===== */
.image-placeholder {
  background: var(--color-gray-rock);
  border-radius: var(--radius-sm);
  aspect-ratio: 16 / 9;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  background-image: linear-gradient(135deg, var(--color-gray-rock) 0%, #9aabb5 100%);
  overflow: hidden;
}

/* ===== SCROLL PROGRESS ===== */
[data-scroll-progress] {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-red), var(--color-gold));
  z-index: 9999;
  width: 0%;
  transition: width 0.1s linear;
  pointer-events: none;
}
@media (prefers-reduced-motion: reduce) {
  [data-scroll-progress] { display: none; }
}

/* ===== RESPONSIVE ===== */
/* Tablet */
@media (max-width: 1024px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
  .footer-bottom { grid-column: 1 / -1; }
}
/* Mobile */
@media (max-width: 767px) {
  :root { --header-height: 70px; }
  .site-header { top: 8px; left: 8px; right: 8px; }
  .site-header-inner { padding: 0.3rem 1rem; min-height: 56px; border-radius: 28px; }
  .site-header-inner::after { display: none; }
  .site-logo { font-size: 1.25rem; }
  .nav-toggle { display: flex; }
  .site-nav {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--color-blue-dark);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    flex-direction: column;
    gap: var(--space-xs);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(241, 196, 15, 0.1);
  }
  .site-nav[data-open] { display: flex; }
  .nav-link {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-size: 1rem;
  }
  .nav-link[aria-current="page"]::after { left: var(--space-md); right: var(--space-md); }
  .btn-cta { width: 100%; text-align: center; margin-top: var(--space-sm); }

  .footer-inner { grid-template-columns: 1fr; gap: var(--space-lg); }
  .footer-bottom { flex-direction: column; gap: var(--space-sm); text-align: center; }
  .footer-links, .footer-contact { align-items: flex-start; }
  .footer-links-title, .footer-contact-title { width: 100%; }

  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  h1 { font-size: 3rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.25rem; }
}

/* Small Mobile */
@media (max-width: 480px) {
  .site-header-inner { padding: 0.25rem 0.75rem; min-height: 50px; border-radius: 25px; }
  .site-logo { font-size: 1.1rem; }
  .btn-cta { font-size: 0.8rem; padding: 0.4rem 1rem; }
  .nav-link { font-size: 0.9rem; }
}