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

:root {
  --bg: #0f0f1a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #222240;
  --accent: #7c6cf0;
  --accent-dim: #5a4db8;
  --text: #e8e8f0;
  --text-muted: #8888aa;
  --border: #2a2a44;
  --radius: 16px;
}

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

/* ====== Nav ====== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15,15,26,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo { font-size: 22px; font-weight: 700; color: var(--text); letter-spacing: -0.5px; }
.nav-links { display: flex; gap: 24px; align-items: center; }
.nav-links a { color: var(--text-muted); font-size: 14px; font-weight: 600; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }

/* ====== Hero ====== */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(124,108,240,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.hero-content { position: relative; max-width: 680px; }
.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 100px;
  background: rgba(124,108,240,0.12);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
  border: 1px solid rgba(124,108,240,0.2);
}
.hero h1 { font-size: clamp(36px, 7vw, 60px); font-weight: 800; line-height: 1.15; margin-bottom: 20px; letter-spacing: -1px; }
.gradient-text { background: linear-gradient(135deg, var(--accent), #a78bfa); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-sub { font-size: 18px; color: var(--text-muted); max-width: 520px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-note { margin-top: 16px; font-size: 13px; color: var(--text-muted); opacity: 0.6; }

/* ====== Buttons ====== */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dim); transform: translateY(-1px); }
.btn-secondary { background: var(--bg-card); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--bg-card-hover); }
.btn-disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }

/* ====== Sections ====== */
.section { padding: 100px 24px; }
.section-inner { max-width: 1100px; margin: 0 auto; }
.section h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; text-align: center; margin-bottom: 12px; }
.section-sub { text-align: center; color: var(--text-muted); font-size: 17px; margin-bottom: 48px; max-width: 560px; margin-left: auto; margin-right: auto; }

/* ====== Features ====== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all 0.3s;
}
.feature-card:hover { background: var(--bg-card-hover); transform: translateY(-2px); }
.feature-icon { font-size: 32px; margin-bottom: 12px; }
.feature-card h3 { font-size: 18px; margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--text-muted); line-height: 1.6; }

/* ====== Trust Section ====== */
.trust-section { background: linear-gradient(180deg, var(--bg) 0%, var(--bg-card) 50%, var(--bg) 100%); }
.trust-section .section-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.trust-text h2 { text-align: left; }
.trust-text p { color: var(--text-muted); margin-bottom: 20px; }
.trust-text ul { list-style: none; padding: 0; }
.trust-text li { padding: 8px 0; font-size: 15px; color: var(--text); border-bottom: 1px solid var(--border); }
.trust-text li:last-child { border: none; }

.trust-levels { display: flex; flex-direction: column; gap: 16px; }
.level {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: all 0.2s;
}
.level:hover { border-color: var(--accent); }
.level-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #6a5acd);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}
.level-label { font-size: 15px; color: var(--text); }

/* ====== Pricing ====== */
.pricing-cards {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}
.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  width: 320px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.price-card.featured {
  border-color: var(--accent);
  position: relative;
}
.featured-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #fff;
  padding: 4px 14px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
}
.price-card h3 { font-size: 20px; }
.price { margin: 8px 0; }
.price-amount { font-size: 36px; font-weight: 800; }
.price-period { font-size: 14px; color: var(--text-muted); }
.price-card ul { list-style: none; padding: 0; flex: 1; }
.price-card li { padding: 6px 0; font-size: 14px; color: var(--text-muted); }

/* ====== CTA ====== */
.cta-section { text-align: center; }

/* ====== Footer ====== */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 24px;
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  text-align: center;
}
.footer-brand strong { font-size: 18px; }
.footer-brand p { font-size: 13px; color: var(--text-muted); }
.footer-links { display: flex; gap: 20px; }
.footer-links a { font-size: 13px; color: var(--text-muted); }
.footer-links a:hover { color: var(--text); }
.footer-copy { font-size: 12px; color: var(--text-muted); opacity: 0.5; }

/* ====== Privacy ====== */
.privacy-page { max-width: 680px; margin: 0 auto; padding: 120px 24px 60px; }
.privacy-page h1 { font-size: 32px; margin-bottom: 24px; }
.privacy-page h2 { font-size: 20px; margin-top: 32px; margin-bottom: 12px; }
.privacy-page p { margin-bottom: 16px; color: var(--text-muted); }


/* ====== AI-Native Tag ====== */
.nav-tag {
  font-size: 10px;
  font-weight: 600;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  color: #fff;
  padding: 2px 8px;
  border-radius: 100px;
  vertical-align: middle;
  margin-left: 6px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.lang-toggle {
  font-size: 14px !important;
  padding: 4px 12px !important;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all 0.2s;
}
.lang-toggle:hover { border-color: var(--accent); color: var(--accent) !important; }

/* ====== Responsive ====== */
@media (max-width: 768px) {
  .trust-section .section-inner { grid-template-columns: 1fr; gap: 40px; }
  .features-grid { grid-template-columns: 1fr; }
  .price-card { width: 100%; max-width: 400px; }
  .hero h1 { font-size: 32px; }
}