/* Minimalist Architectural Structure (极简建筑空间) Theme */
:root {
  --arch-bg: #f8f9fa;
  --arch-surface: #ffffff;
  --arch-card: #f1f3f5;
  --arch-text: #1a1a1a;
  --arch-muted: #6c757d;
  --arch-border: #d1d5db;
  --arch-accent: #2563eb;
  --arch-accent-hover: #1d4ed8;
  --arch-dark-bg: #0f172a;
  --arch-dark-text: #f8fafc;
  --arch-dark-muted: #94a3b8;
  --arch-shadow: 0 4px 20px -1px rgba(0, 0, 0, 0.05), 0 2px 6px -1px rgba(0, 0, 0, 0.03);
  --arch-grid-line: rgba(0, 0, 0, 0.06);
}

* {
  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(--arch-bg);
  color: var(--arch-text);
  line-height: 1.6;
  background-image: 
    linear-gradient(var(--arch-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--arch-grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--arch-border);
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--arch-text);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--arch-text);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  border-radius: 2px;
}

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

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--arch-muted);
}

.nav-link:hover, .nav-link.active {
  color: var(--arch-text);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--arch-text);
  color: #ffffff;
  border-color: var(--arch-text);
}

.btn-primary:hover {
  background: var(--arch-accent);
  border-color: var(--arch-accent);
}

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

.btn-outline:hover {
  border-color: var(--arch-text);
  background: rgba(0, 0, 0, 0.02);
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
  background: linear-gradient(180deg, rgba(255,255,255,0.8) 0%, var(--arch-bg) 100%);
  border-bottom: 1px solid var(--arch-border);
}

.arch-tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  background: #ffffff;
  border: 1px solid var(--arch-border);
  margin-bottom: 24px;
  color: var(--arch-muted);
}

.hero-title {
  font-size: 42px;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--arch-text);
}

.hero-title span {
  color: var(--arch-accent);
}

.hero-subtitle {
  font-size: 18px;
  color: var(--arch-muted);
  max-width: 720px;
  margin: 0 auto 36px;
}

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

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

.arch-card {
  background: #ffffff;
  border: 1px solid var(--arch-border);
  padding: 12px;
  box-shadow: var(--arch-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.arch-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px -2px rgba(0, 0, 0, 0.08);
}

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

.arch-card-label {
  margin-top: 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--arch-muted);
  text-align: center;
}

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

.section-panel {
  background: #ffffff;
}

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

.section-title h2 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}

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

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

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

.feature-card:hover {
  background: #ffffff;
  border-color: var(--arch-text);
  box-shadow: var(--arch-shadow);
}

.feature-icon {
  width: 40px;
  height: 40px;
  background: var(--arch-text);
  color: #fff;
  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;
  margin-bottom: 12px;
}

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

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

.blog-card {
  background: #ffffff;
  border: 1px solid var(--arch-border);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.blog-date {
  font-size: 12px;
  font-weight: 600;
  color: var(--arch-accent);
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.blog-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

.blog-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--arch-text);
}

.blog-link:hover {
  color: var(--arch-accent);
}

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

/* FAQ Section */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-question {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--arch-text);
}

.faq-answer {
  font-size: 14px;
  color: var(--arch-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: #ffffff;
  border: 1px solid var(--arch-border);
  padding: 36px 24px;
  text-align: center;
}

.download-card-icon {
  font-size: 36px;
  margin-bottom: 16px;
}

.download-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

.download-web-banner {
  background: var(--arch-text);
  color: #ffffff;
  border: 1px solid var(--arch-text);
  padding: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.download-web-banner h3 {
  font-size: 22px;
  margin-bottom: 8px;
}

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

/* Footer */
.footer {
  background: var(--arch-dark-bg);
  color: var(--arch-dark-text);
  padding: 70px 0 30px;
}

.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: #ffffff;
}

.footer-col p {
  font-size: 14px;
  color: var(--arch-dark-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(--arch-dark-muted);
}

.footer-col ul li a:hover {
  color: #ffffff;
}

.footer-copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--arch-dark-muted);
}

@media (max-width: 992px) {
  .arch-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;
  }
}