/* ============================================================
   PC28预测网 - Shared Styles
   ============================================================ */

/* ---------- CSS Variables / Theme ---------- */
:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-light: #6366f1;
  --accent: #f59e0b;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 25px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 40px -5px rgba(0,0,0,0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Smooth Scrolling ---------- */
html {
  scroll-behavior: smooth;
}

/* ---------- Base Typography ---------- */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

.navbar.scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.navbar .nav-link {
  position: relative;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.938rem;
  padding: 0.375rem 0;
  transition: color var(--transition);
}

.navbar .nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: width var(--transition);
}

.navbar .nav-link:hover,
.navbar .nav-link.active {
  color: var(--primary);
}

.navbar .nav-link:hover::after,
.navbar .nav-link.active::after {
  width: 100%;
}

.nav-btn-primary {
  background: var(--primary);
  color: #fff !important;
  padding: 0.5rem 1.5rem !important;
  border-radius: 9999px;
  font-weight: 600;
  transition: all var(--transition);
  box-shadow: 0 2px 8px rgba(79,70,229,0.3);
}

.nav-btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 4px 16px rgba(79,70,229,0.45);
  transform: translateY(-1px);
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  z-index: 999;
  animation: slideDown 0.3s ease;
}

.mobile-menu.open {
  display: block;
}

.mobile-menu a {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.mobile-menu a:hover {
  background: rgba(79,70,229,0.08);
  color: var(--primary);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Buttons ---------- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--primary);
  color: #fff;
  padding: 0.75rem 2rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 14px rgba(79,70,229,0.35);
}

.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 6px 22px rgba(79,70,229,0.5);
  transform: translateY(-2px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--primary);
  padding: 0.75rem 2rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: 2px solid var(--primary);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

/* ---------- Section Styles ---------- */
.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.25;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: rgba(79,70,229,0.08);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.813rem;
  padding: 0.375rem 1rem;
  border-radius: 9999px;
  letter-spacing: 0.025em;
}

/* ---------- Hero ---------- */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  background: linear-gradient(135deg, #fafbff 0%, #eef1ff 40%, #f8fafc 100%);
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -150px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(79,70,229,0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-section::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(245,158,11,0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-img-wrapper {
  position: relative;
}

.hero-img-wrapper img {
  border-radius: 20px;
  box-shadow: var(--shadow-xl);
}

.hero-float-card {
  position: absolute;
  background: #fff;
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: floatCard 3s ease-in-out infinite;
}

.hero-float-card.top-right {
  top: 8%;
  right: -10%;
  animation-delay: 0s;
}

.hero-float-card.bottom-left {
  bottom: 12%;
  left: -8%;
  animation-delay: 1.5s;
}

@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ---------- Feature Cards ---------- */
.feature-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(79,70,229,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary);
  margin-bottom: 1.25rem;
  transition: all var(--transition);
}

.feature-card:hover .feature-icon {
  background: var(--primary);
  color: #fff;
  transform: scale(1.05);
}

/* ---------- Stats ---------- */
.stats-section {
  background: linear-gradient(135deg, var(--primary) 0%, #3730a3 100%);
  position: relative;
  overflow: hidden;
}

.stats-section::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -80px;
  width: 300px;
  height: 300px;
  background: rgba(255,255,255,0.04);
  border-radius: 50%;
  pointer-events: none;
}

.stat-item {
  text-align: center;
  color: #fff;
  padding: 1rem;
}

.stat-number {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.025em;
}

.stat-label {
  font-size: 1rem;
  opacity: 0.8;
  margin-top: 0.375rem;
  font-weight: 500;
}

/* ---------- Testimonials ---------- */
.testimonial-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all var(--transition);
}

.testimonial-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.testimonial-stars {
  color: var(--accent);
  letter-spacing: 2px;
}

/* ---------- FAQ Accordion ---------- */
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: var(--primary-light);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: #fff;
  border: none;
  padding: 1.25rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  transition: background var(--transition);
}

.faq-question:hover {
  background: var(--bg-light);
}

.faq-question i {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: transform var(--transition);
  flex-shrink: 0;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-answer-inner {
  padding: 0 1.5rem 1.25rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-item.active .faq-question {
  color: var(--primary);
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

/* ---------- CTA Section ---------- */
.cta-section {
  background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 50%, #c7d2fe 100%);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(79,70,229,0.07) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

/* ---------- Footer ---------- */
.site-footer {
  background: #0f172a;
  color: #cbd5e1;
}

.site-footer h4 {
  color: #fff;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.site-footer a {
  color: #94a3b8;
  text-decoration: none;
  transition: color var(--transition);
}

.site-footer a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 1.5rem;
  margin-top: 2.5rem;
  text-align: center;
  font-size: 0.875rem;
  color: #64748b;
}

/* ---------- About Page ---------- */
.about-hero {
  min-height: 50vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #fafbff 0%, #eef1ff 50%, #f8fafc 100%);
  padding-top: 80px;
}

.about-value-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  transition: all var(--transition);
}

.about-value-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
  border-color: var(--primary-light);
}

.about-value-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(79,70,229,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary);
  margin: 0 auto 1.25rem;
}

/* ---------- Contact Page ---------- */
.contact-form-group {
  margin-bottom: 1.25rem;
}

.contact-form-group label {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  font-size: 0.938rem;
}

.contact-form-group input,
.contact-form-group textarea,
.contact-form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  color: var(--text-primary);
  background: #fff;
  transition: all var(--transition);
  outline: none;
}

.contact-form-group input:focus,
.contact-form-group textarea:focus,
.contact-form-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

.contact-info-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: all var(--transition);
}

.contact-info-card:hover {
  box-shadow: var(--shadow-lg);
}

.contact-info-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(79,70,229,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  color: var(--primary);
  flex-shrink: 0;
}

/* ---------- Animations ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Toast / Notification ---------- */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: #1e293b;
  color: #fff;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-xl);
  z-index: 2000;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 500;
  transform: translateY(120px);
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast.success {
  background: #059669;
}

.toast.error {
  background: #dc2626;
}

/* ---------- Page Header (About/Contact) ---------- */
.page-header {
  padding-top: 120px;
  padding-bottom: 3rem;
  text-align: center;
  background: linear-gradient(135deg, #fafbff 0%, #eef1ff 50%, #f8fafc 100%);
}

.page-header h1 {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--text-primary);
}

.page-header .breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.938rem;
  margin-top: 0.75rem;
}

.page-header .breadcrumb a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.page-header .breadcrumb a:hover {
  text-decoration: underline;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .section-title {
    font-size: 1.75rem;
  }

  .hero-section {
    min-height: auto;
    padding-top: 100px;
    padding-bottom: 3rem;
  }

  .hero-float-card {
    display: none;
  }

  .stat-number {
    font-size: 2rem;
  }

  .page-header h1 {
    font-size: 2rem;
  }
}