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

:root {
  --color-gold: #D4AF37;
  --color-deep-red: #8B0000;
  --color-dark-bg: #1A0F0F;
  --color-warm-white: #FFF9E6;
  --color-gold-light: #F0D78C;
  --color-ink: #141414;
  --color-green: #2E8B57;
  --color-orange: #FF8C00;
  --color-gray: #9A9A9A;
  --color-cream: #FAF3E0;
  --font-display: "STKaiti", "KaiTi", "ZCOOL QingKe HuangYou", "Noto Serif SC", serif;
  --font-body: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-8: 48px;
  --space-10: 64px;
  --header-h: 72px;
  --transition-fast: 0.2s ease;
  --transition-slow: 0.4s ease;
  --shadow-paper: 6px 6px 0 rgba(212, 175, 55, 0.25);
  --border-print: 2px solid var(--color-gold);
}

/* ========== BASE TYPOGRAPHY & ELEMENTS ========== */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-dark-bg);
  background-image: radial-gradient(circle, rgba(212, 175, 55, 0.08) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--color-warm-white);
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-gold-light);
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: 2px;
}

h1 { font-size: 48px; }
h2 { font-size: 32px; }
h3 { font-size: 20px; }

p { margin-bottom: var(--space-4); }

a {
  color: var(--color-gold);
  text-decoration: underline;
  text-decoration-color: var(--color-deep-red);
  text-underline-offset: 4px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

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

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

ul, ol { list-style: none; }

::selection {
  background: var(--color-gold);
  color: var(--color-ink);
}

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

/* ========== LAYOUT ========== */
.container {
  width: 100%;
  max-width: 1360px;
  margin: 0 auto;
  padding-left: var(--space-5);
  padding-right: var(--space-5);
}

#main-content {
  display: block;
  min-height: 60vh;
}

/* ========== CATALOG GRID ========== */
.catalog-grid {
  display: grid;
  grid-template-columns: 7fr 3fr;
  gap: var(--space-6);
}

.grid-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

/* ========== HEADER ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26, 15, 15, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--border-print);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: var(--header-h);
}

/* Skip Link */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 200;
  background: var(--color-gold);
  color: var(--color-ink);
  padding: var(--space-2) var(--space-4);
  border-radius: 0 0 var(--radius-md) 0;
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  left: 0;
  color: var(--color-ink);
}

/* Brand */
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}

.brand:hover { text-decoration: none; }

.brand-icon {
  filter: drop-shadow(0 0 4px rgba(212, 175, 55, 0.4));
}

.brand-text {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 3px;
  line-height: 1;
  text-decoration: none;
}

/* Navigation */
.site-nav ul {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.site-nav a {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-warm-white);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.site-nav a:hover {
  color: var(--color-gold);
  border-color: var(--color-gold);
}

.site-nav a[aria-current="page"] {
  color: var(--color-gold-light);
  background: rgba(212, 175, 55, 0.1);
  border-color: rgba(212, 175, 55, 0.5);
  font-weight: 700;
  box-shadow: inset 3px 0 0 var(--color-deep-red);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  border: 2px solid transparent;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.btn:hover { transform: translateY(-2px); text-decoration: none; }

.btn-primary {
  background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-light) 100%);
  color: var(--color-ink);
  border-color: var(--color-deep-red);
  box-shadow: 3px 3px 0 var(--color-deep-red);
}

.btn-primary:hover {
  color: var(--color-ink);
  box-shadow: 5px 5px 0 var(--color-deep-red);
}

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

.btn-outline:hover {
  background: rgba(212, 175, 55, 0.1);
  color: var(--color-gold-light);
}

/* Nav Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: transparent;
  border: 1px solid var(--color-gold);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-2);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-gold);
  transition: background var(--transition-fast);
}

.nav-toggle:hover .nav-toggle-bar {
  background: var(--color-gold-light);
}

/* ========== FOOTER ========== */
.site-footer {
  background: var(--color-ink);
  color: var(--color-warm-white);
  border-top: 4px solid var(--color-gold);
  margin-top: var(--space-8);
  position: relative;
}

.site-footer::before {
  content: "";
  display: block;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--color-gold) 0 10px, transparent 10px 20px);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: var(--space-6);
  padding: var(--space-8) 0;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 32px;
  color: var(--color-gold);
  margin-bottom: var(--space-3);
  letter-spacing: 3px;
}

.footer-desc {
  color: var(--color-warm-white);
  opacity: 0.8;
  font-size: 14px;
  max-width: 32em;
}

.footer-trust {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 14px;
  color: var(--color-gold-light);
  margin-top: var(--space-4);
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--color-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--color-green);
  flex-shrink: 0;
}

.footer-title {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--color-gold);
  border-bottom: 1px solid rgba(212, 175, 55, 0.3);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-4);
  letter-spacing: 2px;
}

.footer-links ul,
.footer-contact ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a,
.footer-contact a {
  color: var(--color-warm-white);
  text-decoration: none;
  font-size: 14px;
}

.footer-links a:hover,
.footer-contact a:hover {
  color: var(--color-gold);
}

.footer-contact li {
  font-size: 14px;
  line-height: 1.7;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  border-top: 1px solid rgba(212, 175, 55, 0.2);
  padding: var(--space-4) 0;
  font-size: 13px;
  color: var(--color-gray);
}

/* ========== COMPONENTS ========== */
/* Section Label */
.section-label,
.seal-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

.seal-tag {
  background: var(--color-deep-red);
  color: var(--color-gold-light);
  border: 1px solid var(--color-gold);
  box-shadow: 2px 2px 0 var(--color-gold);
}

.section-label {
  background: transparent;
  color: var(--color-gold);
  border: 1px dashed var(--color-gold);
}

/* Cards */
.card,
.ledger-card,
.panel {
  background: var(--color-cream);
  color: var(--color-ink);
  border: 1px solid var(--color-gold);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  box-shadow: var(--shadow-paper);
}

.card-title {
  font-family: var(--font-display);
  color: var(--color-deep-red);
  font-size: 24px;
  margin-bottom: var(--space-3);
}

/* Dashboard Data */
.stat-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  background: var(--color-ink);
  border-left: 4px solid var(--color-gold);
}

.stat-value {
  font-family: var(--font-display);
  font-size: 36px;
  color: var(--color-gold-light);
  line-height: 1;
}

.stat-label {
  font-size: 13px;
  color: var(--color-gray);
}

/* Media Frames */
.media-frame,
.media-frame-16x9,
.media-frame-square {
  display: block;
  width: 100%;
  background: linear-gradient(135deg, var(--color-ink) 0%, #3a2525 100%);
  border: 1px solid var(--color-gold);
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
}

.media-frame-16x9 { aspect-ratio: 16 / 9; }
.media-frame-square { aspect-ratio: 1 / 1; }

.media-frame::before,
.media-frame-16x9::before,
.media-frame-square::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px dashed rgba(212, 175, 55, 0.4);
  border-radius: var(--radius-sm);
  pointer-events: none;
}

.media-frame img,
.media-frame-16x9 img,
.media-frame-square img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  font-size: 14px;
}

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

.breadcrumb a:hover { text-decoration: underline; }

.breadcrumb .sep {
  color: var(--color-gray);
}

.breadcrumb [aria-current="page"] {
  color: var(--color-warm-white);
  font-weight: 700;
}

/* ========== SCROLL PROGRESS & BACK TOP ========== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-deep-red));
  z-index: 1000;
  transition: width 0.1s linear;
}

.back-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-gold);
  color: var(--color-ink);
  border: 2px solid var(--color-deep-red);
  font-size: 24px;
  font-weight: 700;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
  z-index: 100;
  line-height: 1;
}

.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .catalog-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root {
    --header-h: 60px;
  }

  h1 { font-size: 36px; }
  h2 { font-size: 28px; }

  .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  /* Header Mobile */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--color-dark-bg);
    border-bottom: 2px solid var(--color-gold);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
  }

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

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4);
    gap: var(--space-2);
  }

  .site-nav a {
    padding: var(--space-3) var(--space-4);
    font-size: 16px;
  }

  .btn-cta {
    padding: var(--space-2) var(--space-3);
    font-size: 14px;
  }

  /* Footer Mobile */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
    padding: var(--space-6) 0;
  }

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

  .grid-main {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .brand-text {
    font-size: 24px;
  }

  .btn-cta {
    display: none;
  }
}

/* ========== ACCESSIBILITY & REDUCED MOTION ========== */
@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;
  }

  .back-top {
    transition: none;
  }

  .scroll-progress {
    transition: none;
  }
}