/* 基础 */
:root {
  --bg: #0b0b11;
  --text: #e9ecf1;
  --muted: #aab2c0;
  --primary: #7c5cff;
  --secondary: #18d2d2;
  --accent: #ff6ec7;
  --glass: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.16);
  --radius: 16px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(1200px 800px at 10% -10%, rgba(124,92,255,0.25), transparent 60%),
              radial-gradient(1200px 800px at 90% 10%, rgba(24,210,210,0.2), transparent 60%),
              linear-gradient(180deg, #0b0b11 0%, #0f0f17 100%);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.link { color: var(--secondary); }

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 组件 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--glass);
  color: var(--text);
  backdrop-filter: blur(10px);
  transition: transform .15s ease, background .2s ease, box-shadow .2s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn.primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border: none;
}
.btn.secondary {
  background: linear-gradient(135deg, #202534, #161a27);
}
.btn.ghost { background: transparent; }

.section { padding: 96px 0; position: relative; }
.section.alt { background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0)); }
.section-title { font-size: 36px; margin: 0 0 12px; letter-spacing: .5px; }
.section-subtitle { margin: 0 0 36px; color: var(--muted); }

.grid-2 { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.card {
  padding: 24px;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.glass {
  background: linear-gradient(180deg, rgba(255,255,255,0.12), rgba(255,255,255,0.04));
  border: 1px solid rgba(255,255,255,0.18);
  backdrop-filter: blur(12px);
}
.glow { box-shadow: 0 0 0 1px rgba(124,92,255,0.3), 0 20px 60px rgba(124,92,255,0.2); }

/* 顶部导航 */
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(11,11,17,0.6); backdrop-filter: blur(10px); border-bottom: 1px solid rgba(255,255,255,0.06); }
.nav { display: grid; grid-template-columns: auto 1fr auto auto; align-items: center; height: 64px; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; }
.brand .logo { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: linear-gradient(135deg, var(--accent), var(--primary)); }
.brand-text { font-size: 18px; }
.nav-links { display: flex; gap: 18px; justify-content: center; }
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--text); }
.nav-cta { display: flex; gap: 12px; }
.menu-toggle { display: none; font-size: 20px; background: none; border: none; color: var(--text); }

/* Hero */
.hero { position: relative; padding: 120px 0 80px; overflow: hidden; }
.hero h1 { font-size: 46px; line-height: 1.15; margin: 0 0 16px; }
.hero .subtitle { color: var(--muted); margin: 0 0 24px; }
.cta-group { display: flex; gap: 12px; margin: 18px 0 10px; }
.hero-points { margin: 16px 0 0; padding: 0; list-style: none; color: var(--muted); }
.hero-points li { margin: 8px 0; }
.gradient-text { background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }

.phone { width: 330px; height: 640px; border-radius: 28px; border: 1px solid rgba(255,255,255,0.18); padding: 14px; box-shadow: 0 30px 80px rgba(0,0,0,0.45), 0 0 0 1px rgba(255,255,255,0.06) inset; }
.phone .screen { height: 100%; border-radius: 22px; background: linear-gradient(180deg, #0e111a, #111624); padding: 16px; display: grid; align-content: end; gap: 10px; }
.chat-bubble { max-width: 88%; padding: 12px 14px; border-radius: 16px; font-size: 14px; line-height: 1.4; }
.chat-bubble.you { background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.14); border-bottom-left-radius: 4px; }
.chat-bubble.ai { background: linear-gradient(135deg, rgba(124,92,255,0.35), rgba(24,210,210,0.35)); border: 1px solid rgba(255,255,255,0.18); border-bottom-right-radius: 4px; }

.blur-1, .blur-2 { position: absolute; filter: blur(80px); opacity: 0.55; }
.blur-1 { width: 240px; height: 240px; left: -60px; top: -40px; background: radial-gradient(circle at 30% 30%, var(--accent), transparent 60%); }
.blur-2 { width: 280px; height: 280px; right: -60px; bottom: -40px; background: radial-gradient(circle at 70% 70%, var(--primary), transparent 60%); }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: step; list-style: none; padding: 0; margin: 24px 0 0; }
.steps li { background: rgba(255,255,255,0.04); border: 1px solid var(--border); padding: 18px; border-radius: 14px; }
.steps li span { display: inline-block; width: 28px; height: 28px; line-height: 28px; text-align: center; border-radius: 8px; margin-right: 8px; background: linear-gradient(135deg, var(--primary), var(--secondary)); font-weight: 700; }

/* Plans */
.plan { position: relative; }
.plan .price { font-size: 28px; margin: 8px 0 16px; }
.plan ul { margin: 0 0 16px; padding-left: 18px; color: var(--muted); }
.plan.highlight { transform: translateY(-8px); background: linear-gradient(180deg, rgba(255,255,255,0.12), rgba(255,255,255,0.05)); box-shadow: 0 30px 90px rgba(124,92,255,0.25); }
.plan .badge { position: absolute; top: -10px; right: 14px; padding: 6px 10px; font-size: 12px; border-radius: 20px; background: linear-gradient(135deg, var(--accent), var(--primary)); }

/* Quotes */
.quote { font-style: italic; }
.quote cite { display: block; margin-top: 8px; color: var(--muted); font-style: normal; }

/* FAQ */
.faq details { background: rgba(255,255,255,0.04); border: 1px solid var(--border); padding: 16px 18px; border-radius: 12px; margin-bottom: 12px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { color: var(--muted); }

/* CTA */
.cta { text-align: center; }
.waitlist-form { margin: 16px auto; display: flex; gap: 10px; max-width: 520px; }
.waitlist-form input { flex: 1; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border); background: rgba(255,255,255,0.06); color: var(--text); }

/* Footer */
.site-footer { padding: 32px 0; border-top: 1px solid rgba(255,255,255,0.06); background: rgba(11,11,17,0.6); backdrop-filter: blur(10px); }
.footer-grid { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 16px; }
.footer-links { display: flex; gap: 14px; }
.socials { display: flex; gap: 14px; }
.fine { color: var(--muted); font-size: 13px; }
.brand.inline { display: inline-flex; align-items: center; gap: 8px; }

/* 动画与滚动显隐 */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* 响应式 */
@media (max-width: 1000px) {
  .grid-2 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav { grid-template-columns: auto auto 1fr auto; }
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; background: rgba(11,11,17,0.95); padding: 12px 20px; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .nav-links.open { display: flex; flex-direction: column; gap: 12px; }
  .menu-toggle { display: inline-block; }
  .grid-3 { grid-template-columns: 1fr; }
  .phone { margin: 10px auto 0; }
  .hero { padding: 96px 0 56px; }
  .section { padding: 72px 0; }
  .waitlist-form { flex-direction: column; }
}