:root {
  --bg: #f2f6ff;
  --card: #ffffff;
  --text: #112346;
  --muted: #4a5b80;
  --primary: #1465ff;
  --primary-dark: #0c4fce;
  --line: #d7e2f8;
  --accent: #e9f0ff;
  --soft: #f8fbff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 15%, #ecfff8 0%, transparent 40%),
    radial-gradient(circle at 90% 0%, #e8efff 0%, transparent 35%),
    var(--bg);
}

.topbar {
  max-width: 1160px;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}

.brand img {
  width: 36px;
  height: 36px;
}

nav {
  display: flex;
  gap: 18px;
  align-items: center;
}

a {
  color: var(--text);
}

nav a {
  text-decoration: none;
  color: var(--muted);
}

.cta-link,
.lang-toggle {
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--primary-dark);
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
}

.topbar-actions {
  display: flex;
  gap: 10px;
}

main {
  max-width: 1160px;
  margin: 0 auto;
  padding: 8px 20px 56px;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  align-items: stretch;
}

.hero-text,
.hero-card,
.section,
.auth-panel,
.auth-side {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 26px;
  box-shadow: 0 12px 30px rgba(12, 39, 91, 0.05);
}

.badge {
  display: inline-block;
  background: var(--accent);
  color: var(--primary-dark);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 12px;
  letter-spacing: 0.02em;
  font-weight: 700;
}

h1 {
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.15;
  margin: 14px 0;
}

h2 {
  margin: 0;
  font-size: clamp(24px, 2.8vw, 34px);
}

p {
  color: var(--muted);
  line-height: 1.72;
}

.hero-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.btn {
  border: none;
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  font-weight: 700;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

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

.btn-secondary {
  background: #fff;
  border: 1px solid var(--line);
  color: var(--primary-dark);
}

.section {
  margin-top: 24px;
}

.section-soft {
  background: linear-gradient(160deg, #ffffff 0%, #eef4ff 100%);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.grid-3,
.path-list,
.faq-list,
.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.grid-3 article,
.path-list article,
.faq-list article,
.metrics article {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  background: var(--soft);
}

.metric-value {
  margin: 0;
  font-size: 28px;
  color: var(--primary-dark);
  font-weight: 800;
}

footer {
  max-width: 1160px;
  margin: 0 auto;
  padding: 8px 20px 28px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.auth-wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
}

.auth-form {
  display: none;
  gap: 10px;
  margin-top: 14px;
}

.auth-form.active {
  display: grid;
}

label {
  display: grid;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}

input {
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--line);
  font-size: 14px;
}

.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tab-btn {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  color: var(--muted);
}

.tab-btn.active {
  border-color: var(--primary);
  color: var(--primary-dark);
  background: var(--accent);
}

.toast {
  margin-top: 14px;
  min-height: 24px;
  color: var(--primary-dark);
  font-size: 14px;
}

@media (max-width: 980px) {
  .hero,
  .auth-wrap,
  .grid-3,
  .path-list,
  .faq-list,
  .metrics {
    grid-template-columns: 1fr;
  }

  nav {
    display: none;
  }

  .topbar {
    flex-wrap: wrap;
  }
}