:root {
  --primary: #0d9488;
  --primary-dark: #0f766e;
  --primary-light: #ccfbf1;
  --text: #1e293b;
  --muted: #64748b;
  --bg: #f8fafc;
  --white: #fff;
  --border: #e2e8f0;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(15, 118, 110, .08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

header {
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-dark);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), #14b8a6);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

nav a {
  margin-left: 24px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 500;
}

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

.hero {
  background: linear-gradient(135deg, #0f766e 0%, #0d9488 50%, #2dd4bf 100%);
  color: #fff;
  padding: 88px 0 72px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 30%, rgba(255,255,255,.12), transparent 50%),
              radial-gradient(circle at 80% 70%, rgba(255,255,255,.08), transparent 40%);
}

.hero .container { position: relative; z-index: 1; }

.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(255,255,255,.15);
  border-radius: 20px;
  font-size: 13px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: 44px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.hero p {
  font-size: 17px;
  opacity: .92;
  max-width: 580px;
  margin: 0 auto 32px;
}

.btn {
  display: inline-block;
  padding: 13px 32px;
  background: #fff;
  color: var(--primary-dark);
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  box-shadow: 0 4px 14px rgba(0,0,0,.12);
  transition: transform .2s;
}

.btn:hover { transform: translateY(-2px); }

.section-title {
  text-align: center;
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 10px;
}

.section-sub {
  text-align: center;
  color: var(--muted);
  margin-bottom: 40px;
  font-size: 15px;
}

.features {
  padding: 64px 0;
  background: var(--white);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 22px;
  text-align: center;
}

.feature-icon { font-size: 32px; margin-bottom: 12px; }
.feature-card h3 { font-size: 17px; margin-bottom: 8px; }
.feature-card p { color: var(--muted); font-size: 14px; }

.tools {
  padding: 64px 0;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

.tool-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow .2s, transform .2s;
}

.tool-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.tool-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 14px;
}

.tool-card h3 { font-size: 17px; margin-bottom: 8px; }
.tool-card p { color: var(--muted); font-size: 14px; line-height: 1.6; }

.tool-tag {
  display: inline-block;
  margin-top: 12px;
  padding: 3px 10px;
  background: #ecfdf5;
  color: var(--primary-dark);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
}

.about {
  padding: 64px 0;
  background: var(--white);
}

.about-box {
  max-width: 760px;
  margin: 0 auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
}

.about-box h2 { font-size: 24px; margin-bottom: 16px; color: var(--primary-dark); }
.about-box p { color: var(--muted); }

.contact {
  padding: 64px 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  max-width: 800px;
  margin: 0 auto;
}

.contact-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}

.contact-item .label { color: var(--muted); font-size: 13px; margin-bottom: 6px; }
.contact-item .value { font-weight: 600; font-size: 15px; }

.privacy {
  padding: 64px 0;
  background: var(--white);
}

.privacy-box {
  max-width: 760px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.9;
}

footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 40px 0 28px;
  text-align: center;
}

footer a { color: #94a3b8; }
footer a:hover { color: #fff; }

.footer-bottom p { font-size: 14px; margin-bottom: 6px; }

@media (max-width: 768px) {
  .hero h1 { font-size: 30px; }
  nav a { margin-left: 14px; font-size: 14px; }
  .header-inner { height: 60px; }
}