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

:root {
  --primary: #FF6B45;
  --primary-light: #FF8A6A;
  --primary-dark: #E55A38;
  --primary-bg: #FFF3F0;
  --text-title: #1A1A1A;
  --text-body: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border: #EEEEEE;
  --bg: #F5F5F5;
  --white: #FFFFFF;
  --radius-card: 16px;
  --radius-btn: 40px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
  color: var(--text-body);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--white);
  transition: box-shadow 0.3s;
}

.navbar.scrolled {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.navbar-inner {
  display: flex;
  align-items: center;
  height: 56px;
  gap: 24px;
}

.navbar-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  flex-shrink: 0;
}

.navbar-nav {
  display: flex;
  gap: 20px;
}

.navbar-nav a {
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.navbar-nav a:hover {
  color: var(--primary);
}

.navbar-hint {
  margin-left: auto;
  font-size: 13px;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* ===== Hero ===== */
.hero {
  padding: 120px 24px 80px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--white);
  text-align: center;
}

.hero-content {
  max-width: 600px;
  margin: 0 auto;
}

.hero-sub {
  font-size: 16px;
  opacity: 0.85;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.hero-title {
  font-size: 56px;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: 4px;
}

.hero-desc {
  font-size: 17px;
  line-height: 1.8;
  opacity: 0.92;
  margin-bottom: 32px;
}

.hero-cta {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-btn);
  padding: 12px 32px;
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 32px;
}

.hero-tags {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-tags span {
  font-size: 13px;
  opacity: 0.75;
  padding: 4px 12px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 20px;
}

/* ===== Section ===== */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg);
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-title);
  text-align: center;
  margin-bottom: 48px;
}

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

.card {
  background: var(--white);
  border-radius: var(--radius-card);
  padding: 32px 24px;
  text-align: center;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transition: transform 0.2s;
}

.card:hover {
  transform: translateY(-4px);
}

.card-icon {
  font-size: 40px;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-title);
  margin-bottom: 10px;
}

.card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Steps ===== */
.steps {
  max-width: 560px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
}

.step-body h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-title);
  margin-bottom: 4px;
}

.step-body p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  text-align: center;
}

.footer-brand {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-title);
  margin-bottom: 6px;
}

.footer-company {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.footer-beian {
  font-size: 13px;
}

.footer-beian a {
  color: var(--text-muted);
  text-decoration: none;
}

.footer-beian a:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 768px) {
  .navbar-nav {
    display: none;
  }

  .hero {
    padding: 100px 20px 60px;
  }

  .hero-title {
    font-size: 40px;
  }

  .hero-desc {
    font-size: 15px;
  }

  .hero-desc br {
    display: none;
  }

  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 24px;
    margin-bottom: 36px;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .card {
    padding: 24px 20px;
  }
}