/* ============================================================
   MJFTAPP.COM — Blue-Purple Design System (名爵BV飞天)
   Original mjftapp.com style, expanded for multi-page
   ============================================================ */
@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css');

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; }

:root {
  --primary: #4361ee;
  --primary-light: #4895ef;
  --secondary: #3f37c9;
  --accent: #f72585;
  --light: #f8f9fa;
  --dark: #212529;
  --gray: #6c757d;
  --gray-light: #e9ecef;
  --success: #4cc9f0;
  --border-radius: 12px;
  --radius: 12px;
  --shadow: 0 5px 15px rgba(0,0,0,0.08);
  --shadow-lg: 0 15px 40px rgba(67,97,238,0.15);
  --transition: all 0.3s ease;
  --header-h: 80px;
}
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body { background: var(--light); color: var(--dark); line-height: 1.6; overflow-x: hidden; }
img { max-width: 100%; height: auto; border-radius: var(--radius); }
a { text-decoration: none; color: inherit; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* HEADER */
.header {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  position: fixed; width: 100%; z-index: 1000; top: 0; height: var(--header-h);
}
.header-inner {
  display: flex; justify-content: space-between; align-items: center;
  max-width: 1200px; margin: 0 auto; padding: 0 20px; height: 100%;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 22px; color: var(--primary); }
.logo-icon { color: var(--accent); font-size: 20px; }
.nav-links { display: flex; gap: 24px; }
.nav-links a {
  color: var(--dark); font-weight: 500; font-size: 14px; padding: 8px 0;
  position: relative; transition: var(--transition);
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px;
  background: var(--primary); transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.mobile-toggle {
  display: none; background: none; border: 2px solid var(--primary); color: var(--primary);
  font-size: 22px; width: 44px; height: 44px; border-radius: 8px; cursor: pointer;
  align-items: center; justify-content: center;
}

/* PAGE HERO */
.page-hero {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, #f5f7ff 0%, #e6eeff 100%);
  position: relative; overflow: hidden;
}
.page-hero::before {
  content: ''; position: absolute; top: -30%; right: -5%;
  width: 500px; height: 500px; border-radius: 50%;
  background: linear-gradient(135deg, rgba(67,97,238,0.08), rgba(63,55,201,0.04));
}
.bg-main-gradient {
  background: linear-gradient(135deg, #4361ee, #3f37c9) !important;
  color: #fff !important;
}
.bg-main-gradient::before {
  background: linear-gradient(135deg, rgba(255,255,255,0.08), rgba(255,255,255,0.03)) !important;
}
.breadcrumb { font-size: 13px; margin-bottom: 16px; opacity: 0.7; display: flex; gap: 6px; flex-wrap: wrap; }
.breadcrumb a { color: inherit; opacity: 0.8; }
.breadcrumb a:hover { opacity: 1; }
.breadcrumb .sep { opacity: 0.5; }

/* BUTTONS */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 50px; font-weight: 600; font-size: 15px;
  border: none; cursor: pointer; text-decoration: none;
  transition: var(--transition); line-height: 1;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 7px 20px rgba(67,97,238,0.3); }
.btn-accent { background: linear-gradient(135deg, var(--accent), #d81b60); color: #fff; box-shadow: var(--shadow); }
.btn-accent:hover { transform: translateY(-3px); box-shadow: 0 7px 20px rgba(247,37,133,0.3); }
.btn-outline { background: rgba(255,255,255,0.15); color: #fff; border: 2px solid rgba(255,255,255,0.4); }
.btn-outline:hover { background: rgba(255,255,255,0.25); border-color: #fff; }
.btn-ghost { background: transparent; color: var(--primary); border: 2px solid var(--primary); padding: 12px 28px; }
.btn-ghost:hover { background: rgba(67,97,238,0.06); transform: translateY(-2px); }
.btn-sm { padding: 10px 22px; font-size: 13px; }

/* SECTIONS */
.section { padding: 70px 0; }
.section-header { text-align: center; margin-bottom: 40px; }
.section-label {
  display: inline-block; padding: 4px 16px; border-radius: 20px;
  background: rgba(67,97,238,0.08); color: var(--primary);
  font-size: 12px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase;
  margin-bottom: 8px;
}
.section-title { font-size: clamp(22px,3vw,36px); font-weight: 700; color: var(--dark); }
.section-desc { color: var(--gray); font-size: 15px; max-width: 600px; margin: 12px auto 0; }

/* CARDS */
.card {
  background: #fff; border-radius: var(--radius); padding: 24px;
  box-shadow: var(--shadow); border: 1px solid var(--gray-light);
  transition: var(--transition);
}
.card:hover { transform: translateY(-5px); box-shadow: 0 12px 30px rgba(0,0,0,0.1); }
.card-icon {
  width: 60px; height: 60px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 24px; margin: 0 auto 16px;
}

/* STATS */
.stats-section {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff; padding: 60px 0;
}
.stats-grid { display: grid; gap: 24px; text-align: center; }
.stat-number {
  font-weight: 800; font-size: clamp(30px,5vw,44px);
  font-variant-numeric: tabular-nums; display: inline-block;
}
.stat-label { opacity: 0.8; font-size: 14px; margin-top: 4px; }

/* FEATURES */
.features-grid { display: grid; gap: 24px; }

/* FAQ */
.faq-item {
  background: #fff; border-radius: var(--radius); margin-bottom: 12px;
  overflow: hidden; box-shadow: var(--shadow);
}
.faq-question {
  padding: 18px 22px; cursor: pointer; display: flex; justify-content: space-between;
  align-items: center; font-weight: 600; font-size: 15px;
}
.faq-answer { padding: 0 22px; max-height: 0; overflow: hidden; color: var(--gray); font-size: 14px; transition: var(--transition); }
.faq-item.active .faq-answer { padding: 0 22px 20px; max-height: 200px; }
.faq-item.active .faq-question i { transform: rotate(180deg); }
.faq-question i { transition: var(--transition); color: var(--primary); }

/* FOOTER */
.footer {
  background: var(--dark); color: #fff; padding: 60px 0 30px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand { display: flex; flex-direction: column; gap: 12px; }
.footer-brand p { color: rgba(255,255,255,0.6); font-size: 14px; }
.footer-col h4 { font-size: 15px; margin-bottom: 20px; color: #fff; }
.footer-col a {
  display: block; color: rgba(255,255,255,0.6); font-size: 13px;
  margin-bottom: 10px; transition: var(--transition);
}
.footer-col a:hover { color: #fff; padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  color: rgba(255,255,255,0.4); font-size: 13px;
}
.footer-links { display: flex; gap: 16px; }
.footer-links a { color: rgba(255,255,255,0.4); transition: var(--transition); }
.footer-links a:hover { color: #fff; }

/* RESPONSIVE */
@media(max-width:1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media(max-width:768px) {
  .mobile-toggle { display: flex; }
  .nav-links {
    display: none; position: fixed; top: 0; right: -100%;
    width: 85%; max-width: 340px; height: 100vh;
    background: #fff; flex-direction: column;
    padding: 100px 28px 40px; gap: 0;
    box-shadow: -5px 0 25px rgba(0,0,0,0.1);
    transition: right 0.35s ease; z-index: 999; overflow-y: auto;
  }
  .nav-links.open { display: flex; right: 0; }
  .nav-links a {
    padding: 16px 0; border-bottom: 1px solid var(--gray-light);
    font-size: 16px;
  }
  .nav-links a::after { display: none; }
  .nav-links a:hover, .nav-links a.active { color: var(--primary); background: rgba(67,97,238,0.04); padding-left: 10px; }
  .page-hero { padding: 120px 0 50px; }
  .hero-content { flex-direction: column; text-align: center; }
  .section { padding: 50px 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .stats-grid { grid-template-columns: repeat(2,1fr) !important; }
}
@media(max-width:480px) {
  .page-hero { padding: 110px 0 40px; }
  .hero-btn-group { flex-direction: column; align-items: center; width: 100%; }
  .hero-btn-group .btn { width: 100%; justify-content: center; max-width: 320px; }
  .stats-grid { grid-template-columns: repeat(2,1fr) !important; gap: 16px; }
}