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

:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --primary: #1f6aff;
  --primary-strong: #1146d4;
  --line: #e2e8f0;
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
  --radius: 16px;
}

body {
  font-family: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1200px, 92vw);
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(247, 248, 251, 0.85);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: linear-gradient(135deg, #1f6aff, #6aa9ff);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.08em;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  gap: 16px;
}

.brand {
  font-weight: 700;
  font-size: 20px;
}

.nav-links {
  display: flex;
  gap: 28px;
  font-size: 15px;
  color: var(--muted);
}

.nav-cta {
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  transition: transform 0.2s ease, background 0.2s ease;
}

.nav-cta:hover {
  background: var(--primary-strong);
  transform: translateY(-1px);
}

.hero {
  padding: 90px 0 80px;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: #e6efff;
  color: var(--primary-strong);
  font-size: 14px;
  font-weight: 600;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 56px);
  letter-spacing: -0.02em;
  margin: 18px 0 16px;
}

.hero p {
  color: var(--muted);
  font-size: 18px;
  max-width: 520px;
}

.hero-placeholder {
  height: 180px;
  margin-top: 20px;
  border-radius: 12px;
  background: #eef2ff;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.hero-placeholder {
  height: 180px;
  margin-top: 20px;
  border-radius: 12px;
  background: #eef2ff;
}

.button-primary,
.button-ghost {
  padding: 12px 22px;
  border-radius: 12px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.button-primary {
  background: var(--primary);
  color: #fff;
}

.button-primary:hover {
  background: var(--primary-strong);
}

.button-ghost {
  background: #fff;
  border-color: var(--line);
  color: var(--text);
}

.section {
  padding: 70px 0;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 36px;
}

.section-header h2 {
  font-size: clamp(26px, 3.6vw, 38px);
  letter-spacing: -0.01em;
}

.section-header p {
  color: var(--muted);
  max-width: 520px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.card h3 {
  font-size: 18px;
  margin: 12px 0 8px;
}

.card p {
  color: var(--muted);
  font-size: 15px;
}

.pricing-card {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.pricing-list {
  padding-left: 18px;
  color: var(--muted);
  font-size: 14px;
}

.price {
  font-size: 34px;
  font-weight: 700;
}

.badge {
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: 999px;
  background: #eef2ff;
  color: #4338ca;
  font-size: 12px;
  font-weight: 600;
}

.case-card {
  display: grid;
  gap: 16px;
}

.link-primary {
  color: var(--primary);
  font-weight: 600;
}

.blog-card {
  display: grid;
  gap: 10px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
}

.blog-meta {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.blog-detail h1 {
  font-size: clamp(28px, 4vw, 40px);
  margin: 12px 0 8px;
}

.blog-desc {
  color: var(--muted);
  margin-bottom: 18px;
}

.blog-content {
  display: grid;
  gap: 14px;
  margin-bottom: 24px;
}

.blog-cover {
  width: 100%;
  border-radius: 16px;
  margin: 12px 0 16px;
  object-fit: cover;
}

.contact-card {
  display: grid;
  gap: 16px;
}

.contact-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.contact-grid input {
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
}

.alert-success {
  background: #ecfdf3;
  border: 1px solid #a7f3d0;
  color: #065f46;
  padding: 12px 16px;
  border-radius: 12px;
  font-weight: 600;
}

.form-status {
  margin-top: 10px;
  font-size: 14px;
  color: var(--muted);
}

.form-status.success {
  color: #065f46;
}

.form-status.error {
  color: #b91c1c;
}

.footer-title {
  font-weight: 600;
  margin-bottom: 10px;
}

.footer-desc {
  margin-top: 10px;
}

.contact-card {
  display: grid;
  gap: 18px;
}

.contact-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.contact-grid input {
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
}

.contact-grid button {
  border: none;
  cursor: pointer;
}

.brand {
  font-weight: 700;
  font-size: 20px;
}

.footer-title {
  font-weight: 600;
  margin-bottom: 10px;
}

.footer-desc {
  margin-top: 10px;
}

.pricing-list {
  padding-left: 18px;
  color: var(--muted);
  font-size: 14px;
}

.link-primary {
  color: var(--primary);
  font-weight: 600;
}

.contact-card {
  display: grid;
  gap: 18px;
}

.contact-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.contact-grid input {
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
}

.footer {
  padding: 40px 0 50px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 20px;
}

.footer-title {
  font-weight: 600;
  margin-bottom: 10px;
}

.footer-desc {
  margin-top: 10px;
}

@media (max-width: 720px) {
  .nav-links {
    display: none;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }
}