/* ========================================
   德扑学院 - 高端SaaS落地页
   Custom Styles
   ======================================== */

/* --- CSS Variables --- */
:root {
  --primary: #6366F1;
  --primary-dark: #4F46E5;
  --primary-light: #818CF8;
  --primary-50: #EEF2FF;
  --primary-100: #E0E7FF;
  --primary-200: #C7D2FE;
  --accent: #F59E0B;
  --dark: #1E1B4B;
  --text: #374151;
  --text-light: #6B7280;
  --bg: #FAFAFA;
  --white: #FFFFFF;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 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(0,0,0,0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.05);
  --shadow-xl: 0 25px 50px -12px rgba(0,0,0,0.15);
  --shadow-indigo: 0 10px 25px -5px rgba(99,102,241,0.3);
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Base --- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Selection --- */
::selection {
  background: var(--primary);
  color: white;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: #f1f1f1;
}
::-webkit-scrollbar-thumb {
  background: var(--primary-200);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary-light);
}

/* --- Navbar Styles --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: all var(--transition);
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  background: rgba(255,255,255,0.95);
  border-bottom: 1px solid rgba(99,102,241,0.1);
  box-shadow: 0 1px 20px rgba(0,0,0,0.06);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--dark);
  transition: color var(--transition);
}

.nav-logo .logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 10px;
  color: white;
  font-size: 1.2rem;
  box-shadow: 0 4px 12px rgba(99,102,241,0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  transition: color var(--transition);
  padding: 4px 0;
}

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

.nav-links a:hover {
  color: var(--primary);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white !important;
  border-radius: 50px;
  font-weight: 600 !important;
  font-size: 0.88rem !important;
  text-decoration: none;
  transition: all var(--transition);
  box-shadow: 0 4px 15px rgba(99,102,241,0.3);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99,102,241,0.4);
}

.nav-cta::after {
  display: none !important;
}

/* Mobile Menu */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--dark);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: background var(--transition);
}

.mobile-toggle:hover {
  background: var(--primary-50);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(20px);
  z-index: 999;
  padding: 24px;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
}

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

.mobile-menu a {
  display: block;
  padding: 14px 20px;
  text-decoration: none;
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 500;
  border-radius: 12px;
  transition: all var(--transition);
}

.mobile-menu a:hover,
.mobile-menu a:active {
  background: var(--primary-50);
  color: var(--primary);
}

.mobile-menu .mobile-cta {
  margin-top: 12px;
  text-align: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white !important;
  border-radius: 50px;
  font-weight: 600;
}

/* --- Hero Section --- */
.hero-section {
  position: relative;
  padding: 140px 0 100px;
  overflow: hidden;
  background: linear-gradient(180deg, #EEF2FF 0%, #FAFAFA 100%);
}

.hero-bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  pointer-events: none;
}

.hero-bg-orb.orb-1 {
  width: 400px;
  height: 400px;
  background: rgba(99,102,241,0.15);
  top: -100px;
  right: -100px;
  animation: orbFloat 8s ease-in-out infinite;
}

.hero-bg-orb.orb-2 {
  width: 300px;
  height: 300px;
  background: rgba(245,158,11,0.1);
  bottom: -50px;
  left: -80px;
  animation: orbFloat 10s ease-in-out infinite reverse;
}

.hero-bg-orb.orb-3 {
  width: 200px;
  height: 200px;
  background: rgba(99,102,241,0.12);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: orbPulse 6s ease-in-out infinite;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(20px, -20px); }
  66% { transform: translate(-15px, 15px); }
}

@keyframes orbPulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.4; }
  50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.7; }
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: white;
  border: 1px solid var(--primary-200);
  border-radius: 50px;
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero-badge .badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  animation: badgePulse 2s ease-in-out infinite;
}

@keyframes badgePulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--dark);
  margin-bottom: 20px;
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--primary), #7C3AED);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-light);
  line-height: 1.7;
  max-width: 520px;
  margin-bottom: 32px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 8px 25px rgba(99,102,241,0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 35px rgba(99,102,241,0.45);
}

.btn-secondary {
  background: white;
  color: var(--primary);
  border: 2px solid var(--primary-200);
}

.btn-secondary:hover {
  background: var(--primary-50);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.hero-image-wrapper {
  position: relative;
  z-index: 2;
}

.hero-image-wrapper img {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  transition: transform var(--transition);
}

.hero-image-wrapper img:hover {
  transform: translateY(-5px);
}

.hero-image-glow {
  position: absolute;
  inset: -4px;
  border-radius: calc(var(--radius-xl) + 4px);
  background: linear-gradient(135deg, var(--primary), var(--primary-light), var(--primary));
  opacity: 0.15;
  filter: blur(30px);
  z-index: -1;
}

/* --- Section Common --- */
.section-padding {
  padding: 90px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  padding: 6px 18px;
  background: var(--primary-50);
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 50px;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 12px;
  line-height: 1.25;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
}

/* --- Features Section --- */
.features-section {
  background: var(--white);
}

.feature-card {
  background: white;
  border: 1px solid rgba(99,102,241,0.08);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  height: 100%;
}

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

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
  color: var(--primary);
  font-size: 1.4rem;
  margin-bottom: 20px;
  transition: all var(--transition);
}

.feature-card:hover .feature-icon {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow-indigo);
  transform: scale(1.05);
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.92rem;
  color: var(--text-light);
  line-height: 1.65;
  margin: 0;
}

/* --- Stats Section --- */
.stats-section {
  background: linear-gradient(135deg, var(--dark), #312E81);
  position: relative;
  overflow: hidden;
}

.stats-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.stat-item {
  text-align: center;
  color: white;
  position: relative;
  z-index: 2;
}

.stat-number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin-bottom: 6px;
  background: linear-gradient(180deg, #FFFFFF 0%, #C7D2FE 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.95rem;
  color: rgba(199,210,254,0.8);
  font-weight: 500;
}

.stat-icon-small {
  display: inline-block;
  font-size: 1.8rem;
  margin-bottom: 12px;
  opacity: 0.9;
}

/* --- Testimonials Section --- */
.testimonials-section {
  background: var(--bg);
}

.testimonial-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  border: 1px solid rgba(99,102,241,0.06);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  height: 100%;
}

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

.testimonial-stars {
  color: #F59E0B;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
  position: relative;
  padding-left: 16px;
  border-left: 3px solid var(--primary-200);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-weight: 700;
  font-size: 0.95rem;
}

.testimonial-name {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--dark);
}

.testimonial-role {
  font-size: 0.8rem;
  color: var(--text-light);
}

/* --- FAQ Section --- */
.faq-section {
  background: var(--white);
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid rgba(99,102,241,0.1);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  background: white;
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: var(--primary-200);
}

.faq-item.active {
  border-color: var(--primary-200);
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--dark);
  transition: color var(--transition);
}

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

.faq-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary-50);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  transition: all var(--transition);
}

.faq-item.active .faq-icon {
  background: var(--primary);
  color: white;
  transform: rotate(45deg);
}

.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;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.92rem;
  color: var(--text-light);
  line-height: 1.7;
}

/* --- CTA Section --- */
.cta-section {
  background: linear-gradient(135deg, var(--primary), #4F46E5);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  top: -250px;
  right: -100px;
  pointer-events: none;
}

.cta-section::after {
  content: '';
  position: absolute;
  width: 350px;
  height: 350px;
  border-radius: 50%;
  background: rgba(255,255,255,0.04);
  bottom: -150px;
  left: -80px;
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: white;
}

.cta-title {
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  font-weight: 800;
  margin-bottom: 14px;
}

.cta-desc {
  font-size: 1.05rem;
  color: rgba(199,210,254,0.9);
  margin-bottom: 32px;
  line-height: 1.6;
}

.btn-white {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: white;
  color: var(--primary);
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all var(--transition);
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

.btn-white:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 40px rgba(0,0,0,0.2);
  color: var(--primary-dark);
}

.btn-outline-white {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: transparent;
  color: white;
  border: 2px solid rgba(255,255,255,0.4);
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all var(--transition);
}

.btn-outline-white:hover {
  background: rgba(255,255,255,0.1);
  border-color: white;
  transform: translateY(-2px);
}

/* --- Footer --- */
.footer-section {
  background: var(--dark);
  color: rgba(199,210,254,0.7);
  padding: 60px 0 30px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-size: 1.25rem;
  font-weight: 700;
  color: white;
}

.footer-brand .logo-icon-small {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 9px;
  color: white;
  font-size: 1rem;
}

.footer-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-social {
  display: flex;
  gap: 10px;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: rgba(255,255,255,0.06);
  color: rgba(199,210,254,0.7);
  text-decoration: none;
  font-size: 1rem;
  transition: all var(--transition);
}

.footer-social a:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
}

.footer-title {
  color: white;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: rgba(199,210,254,0.6);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid rgba(199,210,254,0.1);
  text-align: center;
  font-size: 0.84rem;
  color: rgba(199,210,254,0.4);
}

/* --- Animations --- */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.scale-in {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* --- Float animation for decorative elements --- */
@keyframes floatSlow {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

.float-slow {
  animation: floatSlow 5s ease-in-out infinite;
}

/* --- Responsive --- */
@media (max-width: 1023px) {
  .hero-section {
    padding: 120px 0 70px;
    text-align: center;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-image-wrapper {
    margin-top: 40px;
  }

  .section-padding {
    padding: 60px 0;
  }
}

@media (max-width: 767px) {
  .nav-links {
    display: none;
  }

  .mobile-toggle {
    display: block;
  }

  .navbar .container {
    height: 64px;
    padding: 0 16px;
  }

  .hero-section {
    padding: 100px 0 50px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .hero-buttons .btn {
    width: 100%;
    justify-content: center;
    max-width: 300px;
  }

  .section-padding {
    padding: 50px 0;
  }

  .feature-card {
    padding: 24px 20px;
  }

  .stat-item {
    margin-bottom: 32px;
  }

  .testimonial-card {
    padding: 24px 20px;
  }

  .faq-question {
    padding: 16px 18px;
    font-size: 0.92rem;
  }

  .faq-answer-inner {
    padding: 0 18px 16px;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }

  .footer-section {
    padding: 40px 0 24px;
  }

  .footer-col {
    margin-bottom: 28px;
  }
}