/* ===== Design Tokens ===== */
:root {
  --color-primary: oklch(0.55 0.18 250);
  --color-primary-light: oklch(0.7 0.14 250);
  --color-primary-dark: oklch(0.4 0.16 250);
  --color-accent: oklch(0.55 0.2 30);
  --color-bg: oklch(1 0 0);
  --color-surface: oklch(0.98 0.01 250);
  --color-text: oklch(0.2 0.02 250);
  --color-text-muted: oklch(0.5 0.03 250);
  --color-border: oklch(0.9 0.02 250);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-card: 0 2px 12px oklch(0.2 0.02 250 / 0.08);
  --shadow-hover: 0 8px 30px oklch(0.2 0.02 250 / 0.12);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; transition: color var(--transition-fast); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; font-size: 1rem; }

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

/* ===== Header / Navigation ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: 72px; display: flex; align-items: center;
}
.header .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; color: var(--color-primary); }
.logo img { height: 40px; width: auto; }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-item { position: relative; }
.nav-link {
  display: flex; align-items: center; gap: 4px;
  padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: 0.95rem; font-weight: 500; color: var(--color-text);
  transition: all var(--transition-fast); white-space: nowrap;
}
.nav-link:hover, .nav-link.active { color: var(--color-primary); background: var(--color-surface); }
.nav-link .arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  margin-left: 4px;
  transition: transform var(--transition-fast);
}
.nav-link .arrow svg {
  width: 12px;
  height: 12px;
  stroke: currentColor;
  stroke-width: 2.5;
  fill: none;
}
.nav-item:hover .arrow { transform: rotate(180deg); }

.dropdown {
  position: absolute; top: 100%; left: 0; min-width: 200px;
  background: #fff; border-radius: var(--radius-md);
  box-shadow: var(--shadow-hover); padding: 8px;
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: all var(--transition-fast);
}
.nav-item:hover .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown a {
  display: block; padding: 10px 16px; border-radius: var(--radius-sm);
  font-size: 0.9rem; color: var(--color-text); transition: all var(--transition-fast);
}
.dropdown a:hover { background: var(--color-surface); color: var(--color-primary); }

.hamburger { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--color-text); border-radius: 2px; transition: all var(--transition-fast); }

/* Mobile Nav Overlay */
.mobile-nav-overlay {
  display: none; position: fixed; inset: 0; z-index: 99;
  background: rgba(0,0,0,0.4); opacity: 0; transition: opacity var(--transition-normal);
}
.mobile-nav-overlay.open { display: block; opacity: 1; }
.mobile-nav-panel {
  position: fixed; top: 0; right: 0; bottom: 0; width: 300px;
  background: #fff; z-index: 100; padding: 80px 24px 24px;
  transform: translateX(100%); transition: transform var(--transition-normal);
  overflow-y: auto;
}
.mobile-nav-overlay.open .mobile-nav-panel { transform: translateX(0); }
.mobile-nav-close {
  position: absolute; top: 20px; right: 20px; font-size: 1.5rem;
  color: var(--color-text); padding: 8px;
}
.mobile-nav-list { display: flex; flex-direction: column; gap: 4px; }
.mobile-nav-list > li > a {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0; font-size: 1.05rem; font-weight: 500;
  border-bottom: 1px solid var(--color-border);
}
.mobile-submenu { display: none; flex-direction: column; gap: 2px; padding-left: 16px; }
.mobile-submenu.open { display: flex; }
.mobile-submenu a { padding: 10px 0; font-size: 0.95rem; color: var(--color-text-muted); }

/* ===== Banner ===== */
.banner {
  margin-top: 72px; min-height: 420px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  display: flex; align-items: center; position: relative; overflow: hidden;
}
.banner-content { position: relative; z-index: 1; color: #fff; max-width: 700px; }
.banner h1 { font-size: 2.8rem; font-weight: 800; line-height: 1.2; margin-bottom: 16px; }
.banner p { font-size: 1.15rem; opacity: 0.9; margin-bottom: 32px; line-height: 1.8; }
.banner-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; background: #fff; color: var(--color-primary);
  border-radius: 50px; font-weight: 600; font-size: 1rem;
  transition: all var(--transition-fast);
}
.banner-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.15); }

/* ===== Section ===== */
.section { padding: 80px 0; }
.section-title { font-size: 2rem; font-weight: 700; text-align: center; margin-bottom: 12px; }
.section-subtitle { text-align: center; color: var(--color-text-muted); font-size: 1.05rem; margin-bottom: 48px; }

/* ===== Service Cards ===== */
.services-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.service-card {
  background: #fff; border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: 32px 28px;
  transition: all var(--transition-normal);
}
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--color-primary-light); }
.service-icon {
  width: 48px; height: 48px; border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.5rem; color: #fff; margin-right: 16px; margin-bottom: 0;
  line-height: 1; flex-shrink: 0; vertical-align: middle;
}
.service-card h3 {
  font-size: 1.15rem; font-weight: 600; margin-bottom: 10px;
  display: inline-block; vertical-align: middle;
}
.service-card p { color: var(--color-text-muted); font-size: 0.95rem; line-height: 1.7; clear: both; }

/* ===== Case Cards ===== */
.cases-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.case-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--color-border); transition: all var(--transition-normal);
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.case-img { width: 100%; height: 220px; object-fit: cover; background: var(--color-surface); }
.case-body { padding: 24px; }
.case-tag {
  display: inline-block; padding: 4px 12px; border-radius: 50px;
  background: var(--color-surface); color: var(--color-primary);
  font-size: 0.8rem; font-weight: 500; margin-bottom: 12px;
}
.case-body h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.case-body p { color: var(--color-text-muted); font-size: 0.9rem; line-height: 1.6; }

/* ===== Stats ===== */
.stats-section { background: var(--color-surface); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; text-align: center; }
.stat-number { font-size: 2.8rem; font-weight: 800; color: var(--color-primary); line-height: 1.2; }
.stat-label { color: var(--color-text-muted); font-size: 0.95rem; margin-top: 8px; }

/* ===== CTA Section ===== */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  text-align: center; color: #fff; padding: 80px 0;
}
.cta-section h2 { font-size: 2rem; font-weight: 700; margin-bottom: 16px; }
.cta-section p { font-size: 1.1rem; opacity: 0.9; margin-bottom: 32px; }
.cta-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 16px 40px; background: #fff; color: var(--color-primary);
  border-radius: 50px; font-weight: 600; font-size: 1.05rem;
  transition: all var(--transition-fast);
}
.cta-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.15); }

/* ===== Pricing ===== */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; align-items: start; }
.pricing-card {
  background: #fff; border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: 40px 32px; text-align: center;
  transition: all var(--transition-normal); position: relative;
}
.pricing-card.featured {
  border-color: var(--color-primary); transform: scale(1.05);
  box-shadow: var(--shadow-hover);
}
.pricing-badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--color-primary); color: #fff; padding: 4px 20px;
  border-radius: 50px; font-size: 0.8rem; font-weight: 600;
}
.pricing-name { font-size: 1.2rem; font-weight: 600; margin-bottom: 8px; }
.pricing-price { font-size: 2.8rem; font-weight: 800; color: var(--color-primary); margin-bottom: 4px; }
.pricing-period { color: var(--color-text-muted); font-size: 0.9rem; margin-bottom: 28px; }
.pricing-features { text-align: left; margin-bottom: 32px; }
.pricing-features li {
  padding: 10px 0; border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem; display: flex; align-items: center; gap: 10px;
}
.pricing-features li::before { content: '✓'; color: var(--color-primary); font-weight: 700; }
.pricing-btn {
  display: block; width: 100%; padding: 14px; border-radius: 50px;
  font-weight: 600; font-size: 1rem; transition: all var(--transition-fast);
  border: 2px solid var(--color-primary); color: var(--color-primary);
}
.pricing-btn:hover { background: var(--color-primary); color: #fff; }
.pricing-card.featured .pricing-btn { background: var(--color-primary); color: #fff; }
.pricing-card.featured .pricing-btn:hover { background: var(--color-primary-dark); }

/* ===== News List ===== */
.news-list { display: flex; flex-direction: column; gap: 24px; }
.news-item {
  display: flex; gap: 24px; background: #fff; border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); overflow: hidden; transition: all var(--transition-normal);
}
.news-item:hover { box-shadow: var(--shadow-hover); }
.news-thumb { width: 280px; height: 180px; min-height: 0; object-fit: cover; background: var(--color-surface); flex-shrink: 0; }
.news-content { padding: 24px; flex: 1; }
.news-date { color: var(--color-text-muted); font-size: 0.85rem; margin-bottom: 8px; }
.news-content h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: 10px; }
.news-content p { color: var(--color-text-muted); font-size: 0.95rem; line-height: 1.7; }

/* ===== Contact Form ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-weight: 500; margin-bottom: 8px; font-size: 0.95rem; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 16px; border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); font-size: 1rem; transition: border-color var(--transition-fast);
  background: #fff;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--color-primary); }
.form-group textarea { resize: vertical; min-height: 120px; }
.submit-btn {
  padding: 14px 40px; background: var(--color-primary); color: #fff;
  border-radius: 50px; font-weight: 600; font-size: 1rem;
  transition: all var(--transition-fast);
}
.submit-btn:hover { background: var(--color-primary-dark); transform: translateY(-1px); }

.contact-info-card {
  background: var(--color-surface); border-radius: var(--radius-lg); padding: 32px;
}
.contact-info-card h3 { font-size: 1.3rem; font-weight: 600; margin-bottom: 24px; }
.info-item { display: flex; gap: 16px; margin-bottom: 20px; align-items: flex-start; }
.info-icon {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--color-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; flex-shrink: 0;
}
.info-item strong { display: block; font-size: 0.95rem; margin-bottom: 2px; }
.info-item span { color: var(--color-text-muted); font-size: 0.9rem; }

/* ===== Footer ===== */
.footer {
  background: var(--color-text); color: rgba(255,255,255,0.7);
  padding: 60px 0 32px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
.footer-brand .logo { color: #fff; margin-bottom: 16px; }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; }
.footer-col h4 { color: #fff; font-size: 1rem; font-weight: 600; margin-bottom: 16px; }
.footer-col a { display: block; padding: 4px 0; font-size: 0.9rem; transition: color var(--transition-fast); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px; text-align: center; font-size: 0.85rem;
}

/* ===== Page Content ===== */
.page-content { padding: 60px 0; }
.page-content h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 16px; }
.page-content h3 { font-size: 1.25rem; font-weight: 600; margin: 32px 0 12px; }
.page-content p { margin-bottom: 16px; color: var(--color-text-muted); line-height: 1.8; }
.page-content ul { margin: 16px 0; padding-left: 24px; }
.page-content ul li { margin-bottom: 8px; color: var(--color-text-muted); position: relative; padding-left: 16px; }
.page-content ul li::before { content: '•'; color: var(--color-primary); position: absolute; left: 0; font-weight: 700; }

/* ===== Breadcrumb ===== */
.breadcrumb { padding: 16px 0; font-size: 0.9rem; color: var(--color-text-muted); }
.breadcrumb a { color: var(--color-primary); }
.breadcrumb span { margin: 0 8px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 420px; margin: 0 auto; }
  .pricing-card.featured { transform: none; }
}

@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .nav-menu { display: none; }
  .hamburger { display: flex; }
  .banner { min-height: 320px; }
  .banner h1 { font-size: 1.8rem; }
  .banner p { font-size: 1rem; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.5rem; }
  .services-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .news-item { flex-direction: column; }
  .news-thumb { width: 100%; height: 200px; min-height: 0; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .stat-number { font-size: 2rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .cta-section h2 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .banner { min-height: 260px; }
  .banner h1 { font-size: 1.5rem; }
  .banner-btn, .cta-btn { padding: 12px 24px; font-size: 0.95rem; }
  .service-card { padding: 24px 20px; }
  .pricing-card { padding: 32px 24px; }
}

/* ===== Timeline ===== */
.timeline { position: relative; left: 28px; width: 560px; max-width: 100%; margin: 0 auto; }
.timeline::before {
  content: ''; position: absolute; left: 15px; top: 8px; bottom: 8px;
  width: 2px; background: var(--color-primary-light); border-radius: 1px;
}
.timeline-item { position: relative; margin-bottom: 32px; padding-left: 40px; }
.timeline-item:last-child { margin-bottom: 0; }
.timeline-dot {
  position: absolute; left: 8px; top: 6px;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--color-primary); border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--color-primary-light); z-index: 1;
}
.timeline-content { width: 520px; max-width: 100%; padding-left: 8px; text-align: left; overflow-wrap: anywhere; }
.timeline-year {
  display: inline-block; font-size: 0.85rem; font-weight: 700;
  color: var(--color-primary); background: oklch(0.95 0.04 250);
  padding: 2px 10px; border-radius: 12px; margin-bottom: 6px;
}
.timeline-content strong { display: block; font-size: 1.05rem; margin-bottom: 4px; }
.timeline-content p { color: var(--color-text-muted); font-size: 0.95rem; line-height: 1.7; margin: 0; }

@media (max-width: 768px) {
  .timeline { left: 0; max-width: 100%; }
  .timeline-item { padding-left: 36px; }
  .timeline::before { left: 11px; }
  .timeline-dot { left: 4px; width: 14px; height: 14px; }
}