:root {
  --primary: #7c3aed;
  --primary-light: #a78bfa;
  --primary-dark: #5b21b6;
  --secondary: #ec4899;
  --accent: #8b5cf6;
  --bg: #faf7ff;
  --bg-dark: #1a1a2e;
  --text: #1f1b2e;
  --text-light: #6b7280;
  --text-lighter: #9ca3af;
  --card: #ffffff;
  --border: rgba(139, 92, 246, 0.15);
  --shadow: 0 20px 60px rgba(124, 58, 237, 0.12);
  --shadow-lg: 0 30px 80px rgba(124, 58, 237, 0.18);
  --gradient-primary: linear-gradient(135deg, #7c3aed 0%, #ec4899 100%);
  --gradient-soft: linear-gradient(135deg, rgba(124, 58, 237, 0.08) 0%, rgba(236, 72, 153, 0.08) 100%);
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.3);
  --container-width: 1200px;
}
.site { background: var(--bg) !important; position: relative; overflow-x: hidden; }
.site::before { content: ""; position: absolute; top: -200px; right: -200px; width: 600px; height: 600px; background: radial-gradient(circle, rgba(124, 58, 237, 0.15) 0%, transparent 70%); border-radius: 50%; z-index: 0; animation: float1 8s ease-in-out infinite; pointer-events: none; }
.site::after { content: ""; position: absolute; top: 40%; left: -300px; width: 500px; height: 500px; background: radial-gradient(circle, rgba(236, 72, 153, 0.12) 0%, transparent 70%); border-radius: 50%; z-index: 0; animation: float2 10s ease-in-out infinite; pointer-events: none; }
@keyframes float1 { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(-30px, 30px); } }
@keyframes float2 { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(30px, -30px); } }
.site-header { background: var(--glass-bg) !important; backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--glass-border) !important; padding: 16px 0 !important; position: sticky; top: 0; z-index: 100; }
@media (min-width: 1200px) { .site-header { padding: 16px calc((100vw - var(--container-width)) / 2) !important; } }
.brand-mark { background: var(--gradient-primary) !important; border-radius: 12px !important; box-shadow: 0 4px 15px rgba(124, 58, 237, 0.4); color: #fff !important; height: 40px !important; width: 40px !important; font-size: 18px !important; }
nav a { position: relative; padding: 6px 0; transition: color 0.3s ease; color: var(--text-light) !important; font-weight: 600 !important; }
nav a:hover { color: var(--primary) !important; }
nav a::after { content: ""; position: absolute; bottom: 0; left: 50%; width: 0; height: 2px; background: var(--gradient-primary); transition: all 0.3s ease; transform: translateX(-50%); border-radius: 2px; }
nav a:hover::after { width: 100%; }
.hero { background: none !important; max-width: var(--container-width); margin: 0 auto; padding: 60px 24px 80px !important; position: relative; z-index: 1; min-height: 68vh !important; }
.hero::after { content: ""; position: absolute; right: -100px; top: 50%; transform: translateY(-50%); width: 450px; height: 450px; background: url("/smartagt-preview.png") center / contain no-repeat; opacity: 0.25; border-radius: 50%; z-index: -1; filter: blur(2px); }
.eyebrow { background: var(--gradient-soft) !important; border: 1px solid var(--border) !important; border-radius: 999px !important; color: var(--primary) !important; display: inline-block !important; font-size: 14px !important; font-weight: 700 !important; margin: 0 0 20px !important; padding: 8px 18px !important; }
h1 { background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary) 100%) !important; -webkit-background-clip: text !important; -webkit-text-fill-color: transparent !important; background-clip: text !important; font-size: 60px !important; line-height: 1.1 !important; margin-bottom: 24px !important; letter-spacing: -1px !important; }
h2 { font-size: 36px !important; line-height: 1.3 !important; color: var(--text) !important; }
.lead { color: var(--text-light) !important; font-size: 18px !important; line-height: 1.9 !important; }
.primary-action, .secondary-action { border-radius: 14px !important; padding: 15px 26px !important; font-size: 15px !important; font-weight: 700 !important; gap: 10px !important; transition: all 0.3s ease !important; }
.primary-action { background: var(--gradient-primary) !important; color: #fff !important; box-shadow: 0 8px 25px rgba(124, 58, 237, 0.35) !important; }
.primary-action:hover { transform: translateY(-2px) !important; box-shadow: 0 12px 35px rgba(124, 58, 237, 0.45) !important; }
.secondary-action { background: var(--glass-bg) !important; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border: 1px solid var(--border) !important; color: var(--primary) !important; }
.secondary-action:hover { background: #fff !important; border-color: var(--primary-light) !important; transform: translateY(-2px) !important; }
.trust-row span { background: var(--glass-bg) !important; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border: 1px solid var(--glass-border) !important; border-radius: 999px !important; color: var(--text-light) !important; padding: 8px 16px !important; font-size: 14px !important; font-weight: 500 !important; }
.trust-row svg { color: var(--primary) !important; }
.section { max-width: var(--container-width) !important; margin: 0 auto !important; padding: 80px 24px !important; position: relative; z-index: 1; }
.section-heading { text-align: center !important; margin: 0 auto 50px !important; max-width: 680px !important; }
.feature-grid { gap: 20px !important; margin-top: 40px !important; }
.feature { background: var(--card) !important; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border: 1px solid var(--border) !important; border-radius: 20px !important; box-shadow: var(--shadow) !important; min-height: 200px !important; padding: 30px !important; transition: all 0.4s ease !important; position: relative; overflow: hidden; }
.feature::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--gradient-primary); opacity: 0; transition: opacity 0.3s ease; }
.feature:hover { transform: translateY(-8px) !important; box-shadow: var(--shadow-lg) !important; border-color: rgba(124, 58, 237, 0.3) !important; }
.feature:hover::before { opacity: 1; }
.feature svg { color: #fff !important; background: var(--gradient-primary); padding: 12px; border-radius: 14px; margin-bottom: 18px; box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3); }
.feature h3 { font-size: 20px !important; margin-bottom: 10px !important; color: var(--text) !important; }
.feature p, .split-section p, .download-band p { color: var(--text-light) !important; line-height: 1.8 !important; }
.workflow { background: var(--bg-dark) !important; padding: 50px 24px !important; position: relative; overflow: hidden; }
.workflow::before { content: ""; position: absolute; top: -100px; right: -100px; width: 400px; height: 400px; background: radial-gradient(circle, rgba(124, 58, 237, 0.3) 0%, transparent 70%); border-radius: 50%; pointer-events: none; }
.workflow-step { border-left: 2px solid rgba(139, 92, 246, 0.3) !important; padding-left: 24px !important; }
.workflow-step span { background: var(--gradient-primary) !important; -webkit-background-clip: text !important; -webkit-text-fill-color: transparent !important; background-clip: text !important; font-size: 14px !important; font-weight: 800 !important; letter-spacing: 1px !important; }
.workflow-step strong { color: #fff !important; font-size: 18px !important; }
.split-section { max-width: var(--container-width) !important; margin: 0 auto !important; padding: 80px 24px !important; gap: 50px !important; align-items: center; }
.security-list span { background: var(--card) !important; border: 1px solid var(--border) !important; border-radius: 16px !important; box-shadow: 0 4px 15px rgba(0, 0, 0, 0.04) !important; padding: 22px 26px 22px 50px !important; font-weight: 500 !important; transition: all 0.3s ease !important; position: relative; }
.security-list span::before { content: "✓"; position: absolute; left: 22px; top: 50%; transform: translateY(-50%); width: 24px; height: 24px; background: var(--gradient-primary); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 800; }
.security-list span:hover { transform: translateX(6px) !important; box-shadow: 0 8px 25px rgba(124, 58, 237, 0.15) !important; border-color: rgba(124, 58, 237, 0.3) !important; }
.download-band { background: var(--gradient-primary) !important; padding: 60px 24px !important; position: relative; overflow: hidden; }
.download-band::before { content: ""; position: absolute; top: -50%; right: -10%; width: 400px; height: 400px; background: rgba(255, 255, 255, 0.1); border-radius: 50%; pointer-events: none; }
.download-band::after { content: ""; position: absolute; bottom: -60%; left: -5%; width: 300px; height: 300px; background: rgba(255, 255, 255, 0.08); border-radius: 50%; pointer-events: none; }
.download-band h2 { color: #fff !important; }
.download-band p { color: rgba(255, 255, 255, 0.85) !important; }
.download-band .primary-action { background: #fff !important; color: var(--primary) !important; box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15) !important; }
@media (max-width: 980px) { h1 { font-size: 42px !important; } .hero::after { width: 300px; height: 300px; right: 50%; transform: translateX(50%); top: 20px; } .feature-grid, .workflow, .split-section { grid-template-columns: 1fr !important; } }

.contact-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  animation: fadeIn 0.25s ease;
}
.contact-modal-mask {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(26, 26, 46, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.contact-modal-box {
  position: relative;
  background: #fff;
  border-radius: 28px;
  padding: 40px 36px 32px;
  width: 88%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 30px 80px rgba(124, 58, 237, 0.25);
  animation: scaleIn 0.3s ease;
}
.contact-modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 36px;
  height: 36px;
  border: 0;
  background: #f3f4f6;
  border-radius: 50%;
  font-size: 22px;
  color: #6b7280;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  transition: all 0.2s ease;
}
.contact-modal-close:hover {
  background: #e5e7eb;
  color: #374151;
  transform: rotate(90deg);
}
.contact-modal-icon {
  font-size: 56px;
  margin-bottom: 16px;
}
.contact-modal-box h3 {
  margin: 0 0 8px;
  font-size: 24px;
  background: linear-gradient(135deg, #7c3aed 0%, #ec4899 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.contact-modal-box > p {
  margin: 0 0 24px;
  color: #6b7280;
  font-size: 14px;
}
.contact-modal-vx {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.08) 0%, rgba(236, 72, 153, 0.08) 100%);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 24px;
}
.contact-modal-vx span {
  display: block;
  color: #6b7280;
  font-size: 13px;
  margin-bottom: 8px;
}
.contact-modal-vx strong {
  display: block;
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 2px;
  background: linear-gradient(135deg, #7c3aed 0%, #ec4899 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-family: 'Courier New', monospace;
}
.contact-modal-copy {
  width: 100%;
  padding: 14px;
  border: 0;
  border-radius: 14px;
  background: linear-gradient(135deg, #7c3aed 0%, #ec4899 100%);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 25px rgba(124, 58, 237, 0.35);
  transition: all 0.3s ease;
}
.contact-modal-copy:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 35px rgba(124, 58, 237, 0.45);
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
/* ===== 手机端适配 ===== */
@media (max-width: 768px) {
  body { font-size: 14px; }
  .site-header { padding: 12px 0 !important; }
  .brand { font-size: 16px; }
  .brand-mark { width: 36px !important; height: 36px !important; font-size: 16px !important; border-radius: 10px !important; }
  nav { display: none !important; }
  .hero { padding: 30px 20px 50px !important; min-height: auto !important; }
  .hero::after { display: none; }
  h1 { font-size: 36px !important; }
  .lead { font-size: 15px !important; line-height: 1.8 !important; }
  .eyebrow { font-size: 12px !important; padding: 6px 14px !important; }
  .hero-actions { flex-direction: column; align-items: stretch; margin-top: 24px; }
  .primary-action, .secondary-action { width: 100%; justify-content: center; padding: 14px 20px !important; font-size: 15px !important; }
  .trust-row { gap: 8px !important; margin-top: 20px !important; }
  .trust-row span { font-size: 12px !important; padding: 6px 12px !important; }
  .section { padding: 50px 20px !important; }
  h2 { font-size: 26px !important; }
  .feature-grid { grid-template-columns: 1fr !important; gap: 14px !important; margin-top: 24px !important; }
  .feature { padding: 22px !important; min-height: auto !important; border-radius: 16px !important; }
  .feature h3 { font-size: 18px !important; }
  .feature p { font-size: 14px !important; }
  .feature svg { padding: 10px; border-radius: 12px; margin-bottom: 14px; }
  .workflow { padding: 30px 20px !important; }
  .workflow > div { grid-template-columns: 1fr 1fr !important; gap: 16px; }
  .workflow-step { border-left: 0 !important; border-top: 2px solid rgba(139, 92, 246, 0.3); padding: 16px 0 0 !important; }
  .workflow-step:first-child { border-top: 0; padding-top: 0; }
  .workflow-step strong { font-size: 15px !important; }
  .split-section { padding: 50px 20px !important; gap: 30px !important; grid-template-columns: 1fr !important; }
  .security-list span { padding: 18px 20px 18px 48px !important; font-size: 14px; }
  .security-list span::before { left: 16px; width: 22px; height: 22px; font-size: 12px; }
  .download-band { padding: 40px 20px !important; }
  .download-band-inner { flex-direction: column !important; text-align: center; gap: 20px; }
  .download-band h2 { font-size: 24px !important; }
  .download-band p { font-size: 14px !important; }
  .download-band .primary-action { width: 100%; justify-content: center; }
  .contact-modal-box { padding: 32px 24px 26px !important; border-radius: 24px !important; width: 92%; }
  .contact-modal-icon { font-size: 44px; margin-bottom: 12px; }
  .contact-modal-box h3 { font-size: 20px !important; }
  .contact-modal-vx { padding: 16px !important; margin-bottom: 20px; }
  .contact-modal-vx strong { font-size: 24px !important; letter-spacing: 1px; }
  .contact-modal-copy { padding: 12px !important; font-size: 15px !important; }
  .contact-modal-close { width: 32px; height: 32px; font-size: 18px; top: 10px; right: 10px; }
}

@media (max-width: 480px) {
  h1 { font-size: 30px !important; }
  h2 { font-size: 22px !important; }
  .section { padding: 40px 16px !important; }
  .hero { padding: 24px 16px 40px !important; }
  .feature { padding: 18px !important; }
}