:root {
  --bg: #eef0f4;
  --bg-warm: #faf7f4;
  --card: rgba(255, 255, 255, 0.82);
  --text: #253041;
  --subtext: #6f7b8f;
  --accent: #7fb3a2;
  --accent-dark: #5f9988;
  --border: rgba(37, 48, 65, 0.08);
  --hero-pink: rgba(255, 196, 222, 0.35);
  --hero-teal: rgba(176, 224, 220, 0.45);
  --max: 960px;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}

a {
  color: var(--accent-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

/* ── Header ── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: rgba(238, 240, 244, 0.85);
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
}

.logo-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 20px;
  font-size: 14px;
}

.nav-links a {
  color: var(--subtext);
}

.nav-links a:hover {
  color: var(--text);
}

/* ── Hero ── */

.hero {
  position: relative;
  overflow: hidden;
  padding: 56px 0 64px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, var(--hero-pink), transparent 45%),
    radial-gradient(circle at 85% 30%, var(--hero-teal), transparent 42%);
  pointer-events: none;
}

.hero .wrap {
  position: relative;
  display: grid;
  gap: 32px;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-dark);
  background: rgba(127, 179, 162, 0.14);
  border-radius: 999px;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-lead {
  margin: 0 0 28px;
  max-width: 540px;
  font-size: 17px;
  color: var(--subtext);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 8px 20px rgba(127, 179, 162, 0.28);
}

.btn-primary:hover {
  background: var(--accent-dark);
}

.btn-ghost {
  color: var(--text);
  background: var(--card);
  border-color: var(--border);
}

.hero-note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--subtext);
}

.hero-card {
  padding: 28px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 12px 32px rgba(37, 48, 65, 0.06);
}

.hero-card h2 {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--subtext);
}

.hero-card p {
  margin: 0 0 8px;
  font-size: 15px;
}

.hero-card .highlight {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
}

/* ── Features ── */

.section {
  padding: 48px 0;
}

.section-title {
  margin: 0 0 8px;
  font-size: 24px;
  font-weight: 700;
}

.section-desc {
  margin: 0 0 28px;
  color: var(--subtext);
  max-width: 560px;
}

.features {
  display: grid;
  gap: 16px;
}

.feature {
  padding: 22px 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
}

.feature-icon {
  font-size: 22px;
  margin-bottom: 8px;
}

.feature h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.feature p {
  margin: 0;
  font-size: 14px;
  color: var(--subtext);
}

/* ── Footer ── */

.site-footer {
  margin-top: 24px;
  padding: 32px 0 48px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--subtext);
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
  align-items: flex-start;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links a {
  color: var(--subtext);
}

@media (min-width: 720px) {
  .hero .wrap {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .features {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 600px) {
  .nav-links {
    gap: 12px;
    font-size: 13px;
  }
}