:root {
  --bg: #fafafa;
  --surface: #fff;
  --border: #e5e5e5;
  --text: #1a1a1a;
  --text-secondary: #666;
  --primary: #111;
  --indigo: #6366f1;
  --indigo-deep: #4f46e5;
  --violet: #8b5cf6;
  --cyan: #06b6d4;
  --red: #c62828;
  --radius: 8px;
}

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

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

body {
  font-family: -apple-system, "Inter", "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

/* ---------- Header ---------- */
.header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.9);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}
.nav {
  max-width: 1080px; margin: 0 auto;
  padding: 12px 24px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 17px; font-weight: 700; letter-spacing: -0.3px;
  color: var(--text);
}
.logo img { width: 28px; height: 28px; border-radius: 7px; display: block; }
.logo-badge {
  font-size: 11px; font-weight: 600; padding: 2px 8px;
  border-radius: 10px; background: #e8f5e9; color: #2e7d32;
  letter-spacing: .3px;
}
.nav-links { display: flex; gap: 18px; align-items: center; font-size: 14px; flex-wrap: wrap; }
.nav-links a { color: var(--text-secondary); transition: color .15s; }
.nav-links a:hover { color: var(--text); }
.nav-link-cta {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 10px;
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: #fff !important; font-weight: 600; font-size: 14px;
  box-shadow: 0 2px 10px rgba(99,102,241,.3);
  transition: all .2s;
}
.nav-link-cta:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(99,102,241,.4); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: 88px 24px 72px;
  background: linear-gradient(180deg, #0a0a0a 0%, #111 35%, #1a1a2e 65%, #16213e 88%, #fafafa 100%);
}
.hero-grid {
  position: absolute; inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse 60% 55% at 50% 30%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 60% 55% at 50% 30%, black 20%, transparent 70%);
  pointer-events: none;
}
.hero-glow {
  position: absolute; top: -140px; left: 50%; transform: translateX(-50%);
  width: 760px; height: 420px;
  background: radial-gradient(ellipse, rgba(99,102,241,.2) 0%, rgba(6,182,212,.07) 42%, transparent 70%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; max-width: 720px; margin: 0 auto; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 500; letter-spacing: .5px;
  padding: 6px 16px; border-radius: 20px;
  background: rgba(255,255,255,.06); color: rgba(255,255,255,.7);
  border: 1px solid rgba(255,255,255,.08);
  backdrop-filter: blur(4px);
  margin-bottom: 28px;
}
.hero-badge-dot {
  width: 6px; height: 6px; border-radius: 50%; background: #22c55e;
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(34,197,94,.4); }
  50% { opacity: .8; box-shadow: 0 0 0 4px rgba(34,197,94,0); }
}
.hero-title {
  font-size: 44px; font-weight: 800; line-height: 1.15;
  letter-spacing: -1.5px; color: #fff;
  margin-bottom: 20px;
}
.hero-accent {
  background: linear-gradient(135deg, #818cf8, #06b6d4, #34d399);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 16px; line-height: 1.75; color: rgba(255,255,255,.55);
  max-width: 560px; margin: 0 auto 36px;
}
.hero-actions { display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap; }
.hero-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 30px; border: none; border-radius: 10px;
  font-size: 16px; font-weight: 600; color: #fff; cursor: pointer;
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  box-shadow: 0 4px 20px rgba(99,102,241,.3);
  transition: all .2s;
}
.hero-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(99,102,241,.4); }
.hero-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 10px;
  font-size: 15px; font-weight: 500; color: rgba(255,255,255,.6);
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.1);
  transition: all .2s;
}
.hero-ghost:hover { background: rgba(255,255,255,.1); color: #fff; border-color: rgba(255,255,255,.2); }
.trust {
  margin-top: 34px; font-size: 13px; color: rgba(255,255,255,.5);
  display: flex; gap: 18px; justify-content: center; flex-wrap: wrap;
}

/* ---------- Sections ---------- */
.section { padding: 56px 24px; max-width: 860px; margin: 0 auto; }
.section h2 {
  font-size: 22px; font-weight: 700; letter-spacing: -0.4px;
  margin-bottom: 16px;
}
.section p { color: #444; margin-bottom: 12px; }
.section ul { margin: 0 0 16px 22px; color: #444; }
.section li { margin-bottom: 8px; }

.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin: 24px 0; }
.step {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 20px 18px;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
  transition: all .2s;
}
.step:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,.06); }
.step-num {
  width: 26px; height: 26px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; color: #fff; margin-bottom: 10px;
  background: linear-gradient(135deg, #6366f1, #4f46e5);
}
.step b { display: block; margin-bottom: 6px; font-size: 15px; }
.step p { font-size: 14px; color: var(--text-secondary); margin: 0; }

.privacy-note {
  background: #f0fdf4; border: 1px solid #bbf7d0;
  border-left: 3px solid #22c55e;
  padding: 14px 18px; border-radius: 10px; font-size: 14px; margin: 18px 0;
}
.warning {
  background: #fef2f2; border: 1px solid #fecaca;
  border-left: 3px solid #ef4444;
  padding: 14px 18px; border-radius: 10px; font-size: 14px; margin: 18px 0;
}

.cta-band {
  text-align: center; padding: 24px 0 8px;
}
.cta-band a { margin: 0 8px; }

/* ---------- FAQ ---------- */
.faq-item { border-bottom: 1px solid var(--border); padding: 18px 0; }
.faq-item h3 { font-size: 16px; margin-bottom: 6px; }
.faq-item p { color: #555; font-size: 15px; }

/* ---------- Related Tools ---------- */
.related-tools { max-width: 1080px; margin: 0 auto; padding: 40px 24px; }
.related-tools h2 { font-size: 22px; font-weight: 700; margin-bottom: 20px; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.related-card { display: block; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; transition: border-color .15s, box-shadow .15s; }
.related-card:hover { border-color: var(--indigo); box-shadow: 0 2px 12px rgba(99,102,241,.08); }
.related-card h3 { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.related-card p { font-size: 13px; color: var(--text-secondary); }

/* ---------- Footer ---------- */
.footer {
  margin-top: 40px;
  border-top: 1px solid #1f2440;
  background: linear-gradient(180deg, #16213e, #0f0f23);
  padding: 36px 24px;
  color: #aab;
}
.footer-links { max-width: 1080px; margin: 0 auto; text-align: center; }
.footer-links a { color: rgba(255,255,255,.7); margin: 0 12px; line-height: 2; transition: opacity .15s; }
.footer-links a:hover { opacity: 1; color: #fff; }
.footer-copy { margin-top: 16px; color: rgba(255,255,255,.4); font-size: 13px; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hero { padding: 64px 20px 52px; }
  .hero-title { font-size: 30px; letter-spacing: -0.5px; }
  .hero-desc { font-size: 14px; }
  .hero-cta { padding: 12px 24px; font-size: 15px; }
  .hero-ghost { padding: 12px 20px; font-size: 14px; }
  .section { padding: 40px 20px; }
  .section h2 { font-size: 20px; }
  .steps { gap: 12px; }
  .nav { padding: 10px 16px; }
}