/* ============================================================
   WPK官网 - Custom Styles
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-light: #6366f1;
  --secondary: #2563eb;
  --accent: #f59e0b;
  --dark: #1e293b;
  --gray: #64748b;
  --light: #f8fafc;
  --white: #ffffff;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  --radius-sm: 0.375rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
}

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

/* --- Body --- */
body {
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  color: var(--dark);
  overflow-x: hidden;
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
  transition: all 0.3s ease;
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
  background: rgba(255, 255, 255, 0.98);
}

.nav-link {
  position: relative;
  font-weight: 500;
  color: var(--dark);
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: width 0.3s ease;
}

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

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

/* --- Mobile Menu --- */
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 999;
  padding: 2rem;
  flex-direction: column;
  gap: 1rem;
  animation: slideDown 0.3s ease;
}

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

.mobile-menu a {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--dark);
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  transition: all 0.3s ease;
}

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

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Hero --- */
.hero-gradient {
  background: linear-gradient(135deg, #eef2ff 0%, #dbeafe 50%, #eff6ff 100%);
}

.hero-badge {
  animation: fadeInUp 0.6s ease;
}

.hero-title {
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-desc {
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-cta {
  animation: fadeInUp 0.6s ease 0.3s both;
}

.hero-img {
  animation: fadeInRight 0.8s ease 0.2s both;
}

/* --- Feature Cards --- */
.feature-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  border: 1px solid rgba(226, 232, 240, 0.5);
  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(--secondary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

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

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

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #eef2ff, #e0e7ff);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary);
  margin-bottom: 1.25rem;
  transition: all 0.3s ease;
}

.feature-card:hover .feature-icon {
  background: var(--primary);
  color: var(--white);
  transform: scale(1.1);
}

/* --- Stats Section --- */
.stat-card {
  text-align: center;
  padding: 2rem;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

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

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Testimonials --- */
.testimonial-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  border: 1px solid rgba(226, 232, 240, 0.5);
}

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

.testimonial-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--primary-light);
}

/* --- FAQ Accordion --- */
.faq-item {
  background: var(--white);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  border: 1px solid rgba(226, 232, 240, 0.6);
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(79, 70, 229, 0.2);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--dark);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  transition: color 0.3s ease;
}

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

.faq-question i {
  font-size: 0.875rem;
  color: var(--gray);
  transition: all 0.3s ease;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 1.5rem 1.25rem;
}

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

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

/* --- CTA Section --- */
.cta-gradient {
  background: linear-gradient(135deg, #4f46e5 0%, #3b82f6 50%, #2563eb 100%);
  position: relative;
  overflow: hidden;
}

.cta-gradient::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
}

.cta-gradient::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 300px;
  height: 300px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 50%;
}

/* --- Footer --- */
.footer-link {
  color: #94a3b8;
  transition: color 0.3s ease;
}

.footer-link:hover {
  color: var(--white);
}

.footer-social {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  transition: all 0.3s ease;
}

.footer-social:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-3px);
}

/* --- Buttons --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white);
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: var(--white);
  color: var(--primary);
  font-weight: 600;
  border-radius: var(--radius);
  border: 2px solid var(--primary);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: rgba(79, 70, 229, 0.05);
  transform: translateY(-2px);
}

/* --- Page Header (for About & Contact) --- */
.page-header {
  padding-top: 6rem;
  padding-bottom: 3rem;
  background: linear-gradient(135deg, #eef2ff 0%, #dbeafe 50%, #eff6ff 100%);
  text-align: center;
}

/* --- Contact Form --- */
.form-input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid #e2e8f0;
  border-radius: var(--radius);
  font-size: 1rem;
  transition: all 0.3s ease;
  background: var(--white);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

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

/* --- About Page --- */
.value-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  border: 1px solid rgba(226, 232, 240, 0.5);
}

.value-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.value-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, #eef2ff, #e0e7ff);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--primary);
  margin: 0 auto 1.25rem;
  transition: all 0.3s ease;
}

.value-card:hover .value-icon {
  background: var(--primary);
  color: var(--white);
}

/* --- Timeline --- */
.timeline-item {
  position: relative;
  padding-left: 2rem;
  padding-bottom: 2rem;
  border-left: 2px solid #e2e8f0;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -7px;
  top: 0;
  width: 12px;
  height: 12px;
  background: var(--primary);
  border-radius: 50%;
  border: 2px solid var(--white);
  box-shadow: 0 0 0 2px var(--primary);
}

.timeline-item:last-child {
  border-left-color: transparent;
}

/* --- Animations --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero-gradient {
    text-align: center;
  }

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

  .feature-card {
    padding: 1.5rem;
  }
}