/* ========== 0079 钴蓝+亮黄「对比冲击风」CSS ========== */

:root {
  --blue: #1e40af;
  --blue-dark: #1e3a8a;
  --blue-light: #2563eb;
  --yellow: #facc15;
  --yellow-light: #fde047;
  --yellow-dark: #ca8a04;
  --white: #ffffff;
  --gray-light: #e2e8f0;
  --gray: #94a3b8;
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: #1e293b;
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ========== Navbar ========== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: var(--blue);
  padding: 0.9rem 0;
  box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}
.navbar .container {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem;
}
.navbar .logo {
  font-size: 1.5rem; font-weight: 800;
  color: var(--yellow); text-decoration: none;
  letter-spacing: 1px;
}
.navbar .logo span { color: var(--white); font-weight: 300; }
.nav-links { display: flex; gap: 2rem; list-style: none; align-items: center; }
.nav-links a {
  color: rgba(255,255,255,0.9); text-decoration: none;
  font-weight: 500; font-size: 0.95rem;
  transition: var(--transition);
}
.nav-links a:hover { color: var(--yellow); }
.nav-links .btn-nav {
  background: var(--yellow); color: var(--blue-dark) !important;
  padding: 0.55rem 1.6rem; border-radius: 6px;
  font-weight: 700; font-size: 0.9rem;
  transition: var(--transition);
}
.nav-links .btn-nav:hover { background: var(--yellow-light); transform: translateY(-1px); }
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; background: none; border: none; padding: 5px;
}
.hamburger span { display: block; width: 26px; height: 2px; background: var(--yellow); transition: var(--transition); }

/* ========== Hero - Split Panel ========== */
.hero {
  min-height: 100vh; display: flex; align-items: stretch;
  padding-top: 60px;
}
.hero-left {
  flex: 0 0 60%; background: var(--blue);
  display: flex; align-items: center; padding: 4rem 5rem 4rem 3rem;
  position: relative; overflow: hidden;
}
.hero-left::after {
  content: ''; position: absolute; right: -40px; top: 50%; transform: translateY(-50%) rotate(8deg);
  width: 80px; height: 120%; background: var(--blue);
}
.hero-left h1 {
  font-size: 3.5rem; font-weight: 800; color: var(--white); line-height: 1.2; margin-bottom: 1.2rem;
}
.hero-left h1 .hl { color: var(--yellow); display: block; font-size: 2rem; font-weight: 300; }
.hero-left p { color: rgba(255,255,255,0.75); font-size: 1.1rem; margin-bottom: 2rem; max-width: 480px; }
.hero-btns { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-right {
  flex: 0 0 40%; background: var(--yellow);
  display: flex; align-items: center; justify-content: center;
  padding: 4rem 3rem;
}
.hero-right .hero-text {
  text-align: center;
}
.hero-right h2 { font-size: 2rem; color: var(--blue-dark); font-weight: 800; margin-bottom: 1rem; }
.hero-right p { color: var(--blue-dark); font-size: 1rem; opacity: 0.8; }
.hero-right img {
  width: 100%; max-width: 350px;
  border-radius: 12px; box-shadow: 0 20px 50px rgba(0,0,0,0.15);
}
.btn-primary {
  background: var(--yellow); color: var(--blue-dark);
  padding: 0.85rem 2.2rem; border-radius: 6px;
  text-decoration: none; font-weight: 700;
  transition: var(--transition); border: none; cursor: pointer;
  font-size: 1rem; display: inline-block;
}
.btn-primary:hover { background: var(--yellow-light); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(250,204,21,0.4); }
.btn-outline {
  background: transparent; color: var(--yellow);
  padding: 0.85rem 2.2rem; border-radius: 6px;
  text-decoration: none; font-weight: 700;
  border: 2px solid var(--yellow); transition: var(--transition);
}
.btn-outline:hover { background: var(--yellow); color: var(--blue-dark); }

/* ========== Section Common ========== */
section { padding: 5rem 2rem; }
.section-tag { font-size: 0.85rem; font-weight: 700; letter-spacing: 3px; text-transform: uppercase; margin-bottom: 0.5rem; }
.section-title { font-size: 2.4rem; font-weight: 800; color: var(--blue-dark); margin-bottom: 0.8rem; line-height: 1.3; }
.section-desc { color: #64748b; font-size: 1.05rem; max-width: 560px; }

/* ========== Features - Alternating ========== */
#features { background: #f8fafc; }
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 0; max-width: 1140px; margin: 3rem auto 0;
}
.feat-card {
  padding: 3rem 2.5rem; color: var(--white);
  transition: var(--transition);
}
.feat-card:nth-child(1), .feat-card:nth-child(3), .feat-card:nth-child(5) { background: var(--blue); }
.feat-card:nth-child(2), .feat-card:nth-child(4), .feat-card:nth-child(6) { background: var(--blue-dark); }
.feat-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.2); }
.feat-card .feat-icon { font-size: 2.4rem; color: var(--yellow); margin-bottom: 1.2rem; }
.feat-card h3 { font-size: 1.2rem; margin-bottom: 0.7rem; font-weight: 700; }
.feat-card p { opacity: 0.85; font-size: 0.95rem; }

/* ========== Stats ========== */
#stats { background: var(--blue-dark); text-align: center; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; max-width: 1000px; margin: 0 auto; }
.stat-num { font-size: 3.5rem; font-weight: 800; color: var(--yellow); line-height: 1; margin-bottom: 0.5rem; }
.stat-label { color: rgba(255,255,255,0.7); font-size: 0.95rem; text-transform: uppercase; letter-spacing: 1px; }

/* ========== Testimonials ========== */
#testimonials { background: #f8fafc; }
.testimonials-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 2rem; max-width: 1100px; margin: 3rem auto 0;
}
.testi-card {
  background: var(--blue); color: var(--white);
  padding: 2.5rem 2rem; border-radius: 12px;
  position: relative; transition: var(--transition);
}
.testi-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(30,64,175,0.3); }
.testi-card .testi-quote {
  font-size: 3rem; color: var(--yellow); line-height: 1;
  margin-bottom: 1rem; font-family: Georgia, serif;
}
.testi-card p { opacity: 0.9; font-size: 1rem; line-height: 1.7; margin-bottom: 1rem; }
.testi-card .author { color: var(--yellow); font-weight: 700; }

/* ========== FAQ ========== */
#faq { background: var(--white); }
.faq-container { max-width: 750px; margin: 3rem auto 0; }
.faq-item { margin-bottom: 0.5rem; border: 2px solid transparent; border-radius: 8px; overflow: hidden; transition: var(--transition); }
.faq-item:has(.faq-q.active) { border-color: var(--yellow); }
.faq-q {
  width: 100%; padding: 1.2rem 1.5rem; text-align: left;
  background: var(--blue); border: none; cursor: pointer;
  font-size: 1.05rem; font-weight: 600; color: var(--white);
  display: flex; justify-content: space-between; align-items: center;
  transition: var(--transition); font-family: inherit;
}
.faq-q:hover { background: var(--blue-light); }
.faq-q i { color: var(--yellow); font-size: 0.9rem; transition: transform 0.3s; }
.faq-q.active i { transform: rotate(45deg); }
.faq-q.active { background: var(--blue-light); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease; background: #fff; }
.faq-a.open { max-height: 200px; padding: 1.2rem 1.5rem; }
.faq-a p { color: #475569; font-size: 0.95rem; line-height: 1.8; }

/* ========== CTA - Diagonal Split ========== */
#cta {
  position: relative; overflow: hidden; text-align: center;
  background: linear-gradient(180deg, var(--yellow) 50%, var(--blue) 50%);
  padding: 5rem 2rem;
}
#cta-inner {
  max-width: 600px; margin: 0 auto;
  background: var(--white); padding: 3rem 2.5rem;
  border-radius: 16px; box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}
#cta-inner h2 { font-size: 2rem; color: var(--blue-dark); margin-bottom: 1rem; font-weight: 800; }
#cta-inner p { color: #64748b; margin-bottom: 2rem; }
#cta-inner .btn-primary { background: var(--blue); color: var(--white); font-size: 1.1rem; padding: 1rem 3rem; }
#cta-inner .btn-primary:hover { background: var(--blue-light); box-shadow: 0 6px 20px rgba(37,99,235,0.4); }

/* ========== Footer ========== */
.footer { background: var(--blue-dark); padding: 3rem 2rem 2rem; color: rgba(255,255,255,0.7); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; max-width: 1200px; margin: 0 auto 2rem; }
.footer h3 { color: var(--yellow); font-size: 1.1rem; margin-bottom: 1rem; font-weight: 700; }
.footer a { color: rgba(255,255,255,0.6); text-decoration: none; transition: var(--transition); display: block; margin-bottom: 0.5rem; font-size: 0.9rem; }
.footer a:hover { color: var(--yellow); }
.footer-bottom { text-align: center; padding-top: 2rem; border-top: 1px solid rgba(250,204,21,0.2); font-size: 0.85rem; max-width: 1200px; margin: 0 auto; }

/* ========== Sub Pages ========== */
.hero-sub {
  background: var(--blue); padding: 8rem 2rem 4rem; text-align: center;
  color: var(--white);
}
.hero-sub h1 { font-size: 2.6rem; margin-bottom: 0.8rem; }
.hero-sub h1 span { color: var(--yellow); }
.hero-sub p { opacity: 0.8; font-size: 1.1rem; }

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav-links { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: var(--blue); padding: 1.5rem 2rem; gap: 1rem; }
  .nav-links.open { display: flex; }
  .hero { flex-direction: column; }
  .hero-left { flex: auto; padding: 3rem 2rem; text-align: center; }
  .hero-left h1 { font-size: 2.4rem; }
  .hero-right { flex: auto; padding: 3rem 2rem; }
  .hero-left p { margin: 0 auto 2rem; }
  .hero-btns { justify-content: center; }
  .features-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; text-align: center; }
  .section-title { font-size: 2rem; }
}
@media (max-width: 480px) {
  .hero-left h1 { font-size: 1.8rem; }
  .hero-left h1 .hl { font-size: 1.4rem; }
  .stats-grid { grid-template-columns: 1fr; }
}