/* Art Deco Golden Line (复古装饰艺术金线) Theme */
:root {
  --art-bg: #091122;
  --art-surface: #0f1c38;
  --art-card: #15274d;
  --art-gold: #d4af37;
  --art-gold-light: #f7e7a1;
  --art-gold-dark: #aa8625;
  --art-gold-border: rgba(212, 175, 55, 0.4);
  --art-text: #f1f5f9;
  --art-muted: #94a3b8;
  --art-dark: #040814;
  --art-shadow: 0 10px 30px rgba(0, 0, 0, 0.4), 0 0 15px rgba(212, 175, 55, 0.1);
  --art-gradient-gold: linear-gradient(135deg, #f7e7a1 0%, #d4af37 50%, #aa8625 100%);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--art-bg);
  color: var(--art-text);
  line-height: 1.6;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(212, 175, 55, 0.08) 0%, transparent 60%),
    linear-gradient(rgba(212, 175, 55, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 175, 55, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 50px 50px, 50px 50px;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.3s ease;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(9, 17, 34, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--art-gold-border);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--art-gold-light);
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--art-surface);
  border: 1px solid var(--art-gold);
  color: var(--art-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transform: rotate(45deg);
}

.logo-icon span {
  transform: rotate(-45deg);
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--art-muted);
  letter-spacing: 0.5px;
}

.nav-link:hover, .nav-link.active {
  color: var(--art-gold);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  position: relative;
  text-transform: uppercase;
}

.btn-primary {
  background: var(--art-gradient-gold);
  color: var(--art-dark);
  border-color: var(--art-gold-light);
  box-shadow: 0 4px 15px rgba(212, 175, 55, 0.25);
}

.btn-primary:hover {
  filter: brightness(1.15);
  box-shadow: 0 6px 20px rgba(212, 175, 55, 0.4);
}

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

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

/* Hero Section */
.hero {
  padding: 90px 0 70px;
  text-align: center;
  position: relative;
  border-bottom: 1px solid var(--art-gold-border);
}

.deco-badge {
  display: inline-block;
  padding: 6px 18px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--art-gold);
  background: rgba(212, 175, 55, 0.08);
  border: 1px solid var(--art-gold-border);
  margin-bottom: 24px;
}

.hero-title {
  font-size: 44px;
  font-weight: 800;
  letter-spacing: 1px;
  line-height: 1.25;
  margin-bottom: 20px;
  color: var(--art-text);
}

.hero-title span {
  background: var(--art-gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--art-muted);
  max-width: 760px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

/* Art Deco Showcase */
.deco-showcase {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.deco-card {
  background: var(--art-surface);
  border: 1px solid var(--art-gold-border);
  padding: 14px;
  box-shadow: var(--art-shadow);
  transition: transform 0.3s ease, border-color 0.3s ease;
  position: relative;
}

.deco-card::before {
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  right: 4px;
  bottom: 4px;
  border: 1px solid rgba(212, 175, 55, 0.15);
  pointer-events: none;
}

.deco-card:hover {
  transform: translateY(-6px);
  border-color: var(--art-gold);
}

.deco-card img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  display: block;
  border: 1px solid var(--art-gold-border);
}

.deco-card-label {
  margin-top: 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--art-gold);
  text-align: center;
  letter-spacing: 1px;
}

/* Sections */
.section {
  padding: 80px 0;
  border-bottom: 1px solid var(--art-gold-border);
}

.section-panel {
  background: var(--art-surface);
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 12px;
  color: var(--art-gold-light);
}

.section-title p {
  color: var(--art-muted);
  font-size: 16px;
}

/* 3x3 Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--art-bg);
  border: 1px solid var(--art-gold-border);
  padding: 32px 24px;
  position: relative;
  transition: all 0.3s ease;
}

.feature-card:hover {
  background: var(--art-card);
  border-color: var(--art-gold);
  box-shadow: var(--art-shadow);
}

.feature-icon {
  width: 42px;
  height: 42px;
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid var(--art-gold);
  color: var(--art-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--art-gold-light);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.feature-card p {
  font-size: 14px;
  color: var(--art-muted);
  line-height: 1.6;
}

/* Blog Section */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.blog-card {
  background: var(--art-surface);
  border: 1px solid var(--art-gold-border);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.3s ease;
}

.blog-card:hover {
  border-color: var(--art-gold);
}

.blog-date {
  font-size: 12px;
  font-weight: 700;
  color: var(--art-gold);
  margin-bottom: 12px;
  letter-spacing: 1.5px;
}

.blog-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--art-text);
  margin-bottom: 12px;
}

.blog-card p {
  font-size: 14px;
  color: var(--art-muted);
  margin-bottom: 20px;
  line-height: 1.6;
}

.blog-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--art-gold);
  letter-spacing: 0.5px;
}

.blog-link:hover {
  color: var(--art-gold-light);
}

.more-wrapper {
  text-align: center;
  margin-top: 40px;
}

/* FAQ Section */
.faq-container {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--art-bg);
  border: 1px solid var(--art-gold-border);
  padding: 24px 30px;
}

.faq-question {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--art-gold-light);
}

.faq-answer {
  font-size: 14px;
  color: var(--art-muted);
  line-height: 1.7;
}

/* Download Page Specific */
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.download-card {
  background: var(--art-surface);
  border: 1px solid var(--art-gold-border);
  padding: 36px 24px;
  text-align: center;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.download-card:hover {
  transform: translateY(-4px);
  border-color: var(--art-gold);
}

.download-card-icon {
  font-size: 38px;
  margin-bottom: 16px;
}

.download-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--art-gold-light);
  margin-bottom: 12px;
}

.download-card p {
  font-size: 14px;
  color: var(--art-muted);
  margin-bottom: 24px;
}

.download-web-banner {
  background: var(--art-card);
  border: 1px solid var(--art-gold);
  padding: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  box-shadow: var(--art-shadow);
}

.download-web-banner h3 {
  font-size: 22px;
  color: var(--art-gold-light);
  margin-bottom: 8px;
}

.download-web-banner p {
  color: var(--art-muted);
  font-size: 14px;
}

/* Footer */
.footer {
  background: var(--art-dark);
  color: var(--art-text);
  padding: 70px 0 30px;
  border-top: 1px solid var(--art-gold-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 50px;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--art-gold);
  letter-spacing: 1px;
}

.footer-col p {
  font-size: 14px;
  color: var(--art-muted);
  line-height: 1.7;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul li a {
  font-size: 14px;
  color: var(--art-muted);
}

.footer-col ul li a:hover {
  color: var(--art-gold-light);
}

.footer-copyright {
  border-top: 1px solid rgba(212, 175, 55, 0.2);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--art-muted);
  letter-spacing: 1px;
}

@media (max-width: 992px) {
  .deco-showcase, .features-grid, .download-grid {
    grid-template-columns: 1fr;
  }
  .blog-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .download-web-banner {
    flex-direction: column;
    text-align: center;
  }
}