/* ================================================
   VX-Dental Official Website — Design System & Styles
   ================================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors */
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light: #DBEAFE;
  --accent: #7C3AED;
  --accent-light: #EDE9FE;
  --success: #059669;
  --danger: #DC2626;
  --warning: #EA580C;

  /* Neutrals */
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;
  --gray-950: #030712;

  /* Spacing */
  --section-py: 120px;
  --container-max: 1200px;
  --container-px: 24px;

  /* Typography */
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;

  /* Shadows */
  --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 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
  --shadow-card: 0 0 0 1px rgba(0,0,0,0.03), 0 2px 4px rgba(0,0,0,0.04), 0 12px 24px rgba(0,0,0,0.06);

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 150ms var(--ease-out);
  --transition-base: 300ms var(--ease-out);
  --transition-slow: 500ms var(--ease-out);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--gray-800);
  background: #ffffff;
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-px);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition-base);
}

.nav.scrolled {
  padding: 10px 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-px);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--gray-900);
}

.logo-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.logo-icon svg {
  width: 100%;
  height: 100%;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-600);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--gray-900);
}

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

.nav-cta {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: var(--gray-900);
  color: #fff;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.nav-cta:hover {
  background: var(--primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 60% at 50% 20%, rgba(37, 99, 235, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 60%, rgba(124, 58, 237, 0.04) 0%, transparent 50%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(0,0,0,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 80%);
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: orbFloat 20s ease-in-out infinite;
}

.hero-orb-1 {
  width: 400px;
  height: 400px;
  background: rgba(37, 99, 235, 0.15);
  top: 10%;
  left: 15%;
}

.hero-orb-2 {
  width: 300px;
  height: 300px;
  background: rgba(124, 58, 237, 0.12);
  top: 40%;
  right: 10%;
  animation-delay: -7s;
}

.hero-orb-3 {
  width: 250px;
  height: 250px;
  background: rgba(5, 150, 105, 0.08);
  bottom: 15%;
  left: 40%;
  animation-delay: -14s;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 15px) scale(0.95); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  animation: fadeInUp 1s var(--ease-out) 0.2s both;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--primary-light);
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 28px;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
  animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: clamp(36px, 5.5vw, 64px);
  font-weight: 800;
  line-height: 1.15;
  color: var(--gray-950);
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 18px;
  color: var(--gray-500);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 64px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-size: 15px;
  font-weight: 600;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #4F46E5 100%);
  color: #fff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
}

.btn-secondary {
  background: var(--gray-100);
  color: var(--gray-700);
  border: 1px solid var(--gray-200);
}

.btn-secondary:hover {
  background: var(--gray-200);
  transform: translateY(-1px);
}

.btn-white {
  background: #fff;
  color: var(--gray-900);
  box-shadow: var(--shadow-md);
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Hero Metrics */
.hero-metrics {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
}

.metric {
  text-align: center;
}

.metric-value {
  font-size: 36px;
  font-weight: 800;
  color: var(--gray-900);
  font-variant-numeric: tabular-nums;
}

.metric-suffix {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
}

.metric-label {
  display: block;
  font-size: 13px;
  color: var(--gray-500);
  margin-top: 4px;
}

.metric-divider {
  width: 1px;
  height: 40px;
  background: var(--gray-200);
}

/* --- Section Shared --- */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-badge {
  display: inline-block;
  padding: 4px 14px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-badge-light {
  background: rgba(255,255,255,0.15);
  color: #fff;
}

.section-title {
  font-size: clamp(28px, 3.5vw, 42px);
  font-weight: 800;
  color: var(--gray-950);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 17px;
  color: var(--gray-500);
  max-width: 560px;
  margin: 0 auto;
}

/* --- Features Section --- */
.features {
  padding: var(--section-py) 0;
  background: var(--gray-50);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--gray-200);
  transition: all var(--transition-base);
  position: relative;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: transparent;
}

.feature-card-lg {
  grid-column: span 1;
  grid-row: span 2;
  display: flex;
  flex-direction: column;
  background: linear-gradient(135deg, #1E3A5F 0%, #0F172A 100%);
  color: #fff;
  border-color: transparent;
}

.feature-card-lg h3 {
  color: #fff;
}

.feature-card-lg p {
  color: rgba(255,255,255,0.7);
}

.feature-card-lg:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.3);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--icon-bg, rgba(37,99,235,0.1));
  color: var(--icon-color, #2563EB);
  margin-bottom: 20px;
}

.feature-card-lg .feature-icon {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
}

.feature-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
  margin-top: auto;
  padding-top: 6px;
}

/* --- Workflow Section --- */
.workflow {
  padding: var(--section-py) 0;
}

.workflow-steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
}

.workflow-step {
  flex: 1;
  max-width: 240px;
  text-align: center;
  position: relative;
}

.step-number {
  font-size: 48px;
  font-weight: 800;
  color: var(--primary); /* 蓝色高亮展示 */
  line-height: 1;
  margin-bottom: 16px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-variant-numeric: tabular-nums;
}

.workflow-step:hover .step-number {
  transform: translateY(-6px) scale(1.05); /* 向上跳动并轻微放大的特效 */
  text-shadow: 0 8px 16px rgba(37, 99, 235, 0.2);
}

.step-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  transition: all var(--transition-base);
}

.workflow-step:hover .step-icon {
  background: var(--primary);
  color: #fff;
  transform: scale(1.05);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.25);
}

.step-content h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.step-content p {
  font-size: 13px;
  color: var(--gray-500);
  line-height: 1.6;
}

.workflow-connector {
  display: flex;
  align-items: center;
  color: var(--gray-300);
  padding-top: 56px;
  flex-shrink: 0;
}

/* --- Team Section --- */
.team {
  padding: var(--section-py) 0;
  background: var(--gray-50);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.team-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  border: 1px solid var(--gray-200);
  transition: all var(--transition-base);
}

.team-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: transparent;
}

.team-avatar {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

.avatar-placeholder {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--avatar-color, var(--primary));
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}

.team-card:hover .avatar-placeholder {
  transform: scale(1.05);
}

.team-card h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 4px;
}

.team-title {
  font-size: 14px;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 12px;
}

.team-desc {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.6;
  margin-bottom: 16px;
}

.team-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

.team-tags span {
  padding: 4px 10px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-full);
  font-size: 12px;
  color: var(--gray-600);
}

/* --- Stats Section --- */
.stats {
  padding: var(--section-py) 0;
  background: linear-gradient(135deg, #0F172A 0%, #1E3A5F 50%, #1E1B4B 100%);
  color: #fff;
}

.stats-content {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
  align-items: center;
}

.stats-title {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.stats-desc {
  font-size: 16px;
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.stat-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-base);
}

.stat-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.12);
  transform: translateY(-2px);
}

.stat-value {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 4px;
  font-variant-numeric: tabular-nums;
}

.stat-value span {
  font-size: 20px;
  color: var(--primary);
  font-weight: 600;
}

.stat-label {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 12px;
}

.stat-bar {
  height: 4px;
  background: rgba(255,255,255,0.1);
  border-radius: 2px;
  overflow: hidden;
}

.stat-bar-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  transition: width 1.5s var(--ease-out);
}

.stat-bar-fill.animate {
  width: var(--bar-width);
}

/* --- CTA Section --- */
.cta {
  padding: var(--section-py) 0;
}

.cta-content {
  position: relative;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  border-radius: var(--radius-xl);
  padding: 80px 40px;
  text-align: center;
  color: #fff;
  overflow: hidden;
}

.cta-bg-pattern {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 20% 50%, rgba(255,255,255,0.1) 0%, transparent 50%),
                     radial-gradient(circle at 80% 50%, rgba(255,255,255,0.05) 0%, transparent 50%);
}

.cta-content h2 {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  margin-bottom: 12px;
  position: relative;
}

.cta-content p {
  font-size: 17px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
  position: relative;
}

.cta-actions {
  position: relative;
}

/* --- Footer --- */
.footer {
  padding: 60px 0 0;
  background: var(--gray-950);
  color: rgba(255,255,255,0.6);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand {
  max-width: 320px;
}

.footer-brand .nav-logo {
  margin-bottom: 12px;
  color: #fff;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
}

.footer-links {
  display: flex;
  gap: 60px;
}

.footer-col h5 {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 10px;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding: 24px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255,255,255,0.3);
}

.footer-disclaimer {
  margin-top: 8px;
  font-size: 12px !important;
  color: rgba(255,255,255,0.2) !important;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --section-py: 80px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    padding: 16px 24px;
    flex-direction: column;
    gap: 12px;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-lg);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-cta {
    display: none;
  }

  .hero-title br {
    display: none;
  }

  .hero-desc {
    font-size: 16px;
  }

  .hero-desc br {
    display: none;
  }

  .hero-actions {
    flex-direction: column;
    gap: 12px;
  }

  .hero-metrics {
    flex-direction: column;
    gap: 24px;
  }

  .metric-divider {
    width: 60px;
    height: 1px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .feature-card-lg {
    grid-row: span 1;
  }

  .workflow-steps {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

  .workflow-step {
    max-width: 100%;
  }

  .workflow-connector {
    transform: rotate(90deg);
    padding-top: 0;
  }

  .team-grid {
    grid-template-columns: 1fr;
  }

  .stats-content {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .cta-content {
    padding: 60px 24px;
  }

  .footer-content {
    flex-direction: column;
    gap: 32px;
  }

  .footer-links {
    gap: 32px;
  }
}

/* --- Animations on Scroll --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

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