/* ============================================
   智赢AI - 企业官网样式表
   设计系统：科技蓝 + 蓝紫渐变 + 黑白基底
   ============================================ */

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

:root {
  /* Colors - Primary */
  --blue-50: #eff6ff;
  --blue-100: #dbeafe;
  --blue-200: #bfdbfe;
  --blue-300: #93c5fd;
  --blue-400: #60a5fa;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --blue-800: #1e40af;
  --blue-900: #1e3a8a;

  /* Colors - Purple */
  --purple-400: #a78bfa;
  --purple-500: #8b5cf6;
  --purple-600: #7c3aed;
  --purple-700: #6d28d9;

  /* Colors - Slate */
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --slate-950: #020617;

  /* Semantic */
  --white: #ffffff;
  --black: #000000;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --gradient-primary-light: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --gradient-dark: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  --gradient-hero: radial-gradient(ellipse at top, #1e3a8a 0%, #0f172a 50%, #020617 100%);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Container */
  --container-max: 1200px;
  --container-padding: 24px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
  --shadow-blue: 0 4px 14px rgba(37, 99, 235, 0.35);
  --shadow-purple: 0 4px 14px rgba(124, 58, 237, 0.35);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  color: var(--slate-800);
  background: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul, ol {
  list-style: none;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ===== Layout Utilities ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

.section-sm {
  padding: var(--space-2xl) 0;
}

.section-dark {
  background: var(--gradient-dark);
  color: var(--white);
}

.section-light {
  background: var(--slate-50);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-2xl);
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: var(--blue-50);
  color: var(--blue-600);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.section-dark .section-tag {
  background: rgba(59, 130, 246, 0.15);
  color: var(--blue-300);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.section-dark .section-title {
  color: var(--white);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--slate-500);
  line-height: 1.7;
}

.section-dark .section-subtitle {
  color: var(--slate-400);
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  white-space: nowrap;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--white);
  box-shadow: var(--shadow-blue);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
  border-color: var(--white);
  background: rgba(255, 255, 255, 0.1);
}

.btn-outline-dark {
  background: transparent;
  color: var(--blue-600);
  border-color: var(--blue-200);
}

.btn-outline-dark:hover {
  background: var(--blue-50);
  border-color: var(--blue-400);
}

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

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

.btn-lg {
  padding: 16px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.875rem;
}

.btn-block {
  width: 100%;
}

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

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  padding: 12px 0;
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--white);
  transition: color var(--transition-base);
}

.navbar.scrolled .nav-logo {
  color: var(--slate-900);
}

.logo-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  color: var(--white);
  font-size: 1.1rem;
}

.logo-text {
  letter-spacing: -0.02em;
}

.logo-text span {
  color: var(--blue-400);
}

.navbar.scrolled .logo-text span {
  color: var(--blue-600);
}

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

.nav-menu a {
  font-size: 0.95rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  transition: color var(--transition-base);
  position: relative;
}

.navbar.scrolled .nav-menu a {
  color: var(--slate-600);
}

.nav-menu a:hover {
  color: var(--white);
}

.navbar.scrolled .nav-menu a:hover {
  color: var(--blue-600);
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

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

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-cta .btn-primary {
  background: var(--gradient-primary);
  color: var(--white);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: all var(--transition-base);
  border-radius: 2px;
}

.navbar.scrolled .nav-toggle span {
  background: var(--slate-800);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.3;
}

.hero-glow-1 {
  top: -200px;
  right: -100px;
  background: var(--blue-600);
}

.hero-glow-2 {
  bottom: -200px;
  left: -100px;
  background: var(--purple-600);
}

.hero-container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: var(--blue-300);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--blue-400);
  border-radius: 50%;
  animation: pulse 2s ease infinite;
}

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

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--white);
  margin-bottom: var(--space-md);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--slate-400);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.hero-stats {
  display: flex;
  gap: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-stat {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 1.75rem;
  font-weight: 800;
  background: var(--gradient-primary-light);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--slate-400);
  margin-top: 4px;
}

/* Hero Visual - Growth Loop */
.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.growth-loop-svg {
  width: 100%;
  max-width: 480px;
  height: auto;
}

.growth-loop-svg .rotating-circle {
  animation: rotate 30s linear infinite;
  transform-origin: 260px 260px;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.growth-loop-svg .node-circle {
  transition: all var(--transition-base);
}

.growth-loop-svg .node-group:hover .node-circle {
  r: 42;
}

.growth-loop-svg .pulse-ring {
  animation: pulse-ring 3s ease-out infinite;
  transform-origin: center;
}

@keyframes pulse-ring {
  0% { opacity: 0.6; r: 36; }
  100% { opacity: 0; r: 55; }
}

/* ===== Trust Bar ===== */
.trust-bar {
  background: var(--slate-900);
  padding: 32px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.trust-bar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.trust-label {
  font-size: 0.85rem;
  color: var(--slate-500);
  font-weight: 500;
}

.trust-industries {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.trust-industry {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--slate-400);
  font-size: 0.9rem;
  font-weight: 500;
}

.trust-industry svg {
  width: 18px;
  height: 18px;
  color: var(--blue-400);
}

/* ===== Pain Points Section ===== */
.pain-points {
  background: var(--slate-50);
}

.pain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.pain-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--slate-200);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.pain-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.pain-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--blue-200);
}

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

.pain-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue-50);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  color: var(--blue-600);
}

.pain-icon svg {
  width: 26px;
  height: 26px;
}

.pain-number {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--slate-100);
  line-height: 1;
}

.pain-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--slate-800);
  margin-bottom: var(--space-xs);
}

.pain-card p {
  font-size: 0.9rem;
  color: var(--slate-500);
  line-height: 1.6;
}

.pain-cta {
  text-align: center;
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--slate-200);
}

.pain-cta p {
  font-size: 1.05rem;
  color: var(--slate-700);
  font-weight: 500;
  margin-bottom: var(--space-md);
}

.pain-cta p strong {
  color: var(--blue-600);
}

/* ===== Solutions Section ===== */
.solutions {
  background: var(--white);
}

.solution-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.solution-tab {
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--slate-600);
  background: var(--slate-100);
  transition: all var(--transition-base);
  cursor: pointer;
  border: 1px solid transparent;
  display: flex;
  align-items: center;
  gap: 8px;
}

.solution-tab svg {
  width: 18px;
  height: 18px;
}

.solution-tab:hover {
  background: var(--blue-50);
  color: var(--blue-600);
}

.solution-tab.active {
  background: var(--gradient-primary);
  color: var(--white);
  box-shadow: var(--shadow-blue);
}

.solution-panel {
  display: none;
  animation: fadeInUp 0.4s ease;
}

.solution-panel.active {
  display: block;
}

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

.solution-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
  background: var(--slate-50);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  border: 1px solid var(--slate-200);
}

.solution-info h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--slate-900);
  margin-bottom: var(--space-xs);
}

.solution-product {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--blue-50);
  color: var(--blue-600);
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.solution-solve {
  font-size: 0.95rem;
  color: var(--slate-600);
  margin-bottom: var(--space-lg);
  line-height: 1.7;
}

.solution-capabilities {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: var(--space-lg);
}

.capability-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--slate-700);
}

.capability-item svg {
  width: 20px;
  height: 20px;
  color: var(--blue-600);
  flex-shrink: 0;
  margin-top: 2px;
}

.solution-value {
  padding: var(--space-md);
  background: var(--white);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--blue-600);
}

.solution-value-label {
  font-size: 0.8rem;
  color: var(--slate-400);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.solution-value-text {
  font-size: 0.95rem;
  color: var(--slate-800);
  font-weight: 500;
}

.solution-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
}

.solution-visual svg {
  width: 100%;
  max-width: 360px;
  height: auto;
}

/* ===== Conversion Funnel ===== */
.funnel {
  background: var(--gradient-dark);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.funnel::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.funnel-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 720px;
  margin: 0 auto;
  position: relative;
}

.funnel-step {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-lg);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  margin-bottom: 0;
  position: relative;
  transition: all var(--transition-base);
}

.funnel-step:hover {
  background: rgba(59, 130, 246, 0.15);
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateX(8px);
}

.funnel-step:not(:last-child)::after {
  content: '';
  position: absolute;
  bottom: -24px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 24px;
  background: linear-gradient(to bottom, rgba(59, 130, 246, 0.5), transparent);
}

.funnel-num {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.funnel-text {
  font-size: 1rem;
  font-weight: 500;
  color: var(--slate-200);
}

.funnel-text strong {
  color: var(--white);
}

/* ===== Diagnosis Tool ===== */
.diagnosis {
  background: var(--slate-50);
}

.diagnosis-wrap {
  max-width: 760px;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--slate-200);
}

.diagnosis-header {
  background: var(--gradient-primary);
  padding: var(--space-xl) var(--space-xl) var(--space-lg);
  color: var(--white);
  text-align: center;
}

.diagnosis-header h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: var(--space-xs);
}

.diagnosis-header p {
  font-size: 0.95rem;
  opacity: 0.9;
}

.diagnosis-progress {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: var(--space-md) var(--space-xl);
  background: var(--slate-50);
  border-bottom: 1px solid var(--slate-200);
}

.progress-bar {
  flex: 1;
  height: 6px;
  background: var(--slate-200);
  border-radius: var(--radius-full);
  overflow: hidden;
  max-width: 300px;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  width: 16.67%;
}

.progress-text {
  font-size: 0.85rem;
  color: var(--slate-500);
  font-weight: 600;
  white-space: nowrap;
}

.diagnosis-body {
  padding: var(--space-xl);
  min-height: 380px;
}

.diagnosis-step {
  display: none;
  animation: fadeInUp 0.3s ease;
}

.diagnosis-step.active {
  display: block;
}

.diagnosis-step h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--slate-800);
  margin-bottom: var(--space-md);
}

.option-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.option-grid.cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.option-card {
  padding: var(--space-md);
  border: 2px solid var(--slate-200);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--slate-600);
  background: var(--white);
}

.option-card:hover {
  border-color: var(--blue-300);
  background: var(--blue-50);
}

.option-card.selected {
  border-color: var(--blue-600);
  background: var(--blue-50);
  color: var(--blue-700);
}

.option-card.selected::after {
  content: '✓';
  position: absolute;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.checkbox-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: var(--space-md);
  border: 2px solid var(--slate-200);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--slate-600);
  background: var(--white);
}

.checkbox-card:hover {
  border-color: var(--blue-300);
  background: var(--blue-50);
}

.checkbox-card.selected {
  border-color: var(--blue-600);
  background: var(--blue-50);
  color: var(--blue-700);
}

.checkbox-indicator {
  width: 20px;
  height: 20px;
  border: 2px solid var(--slate-300);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.checkbox-card.selected .checkbox-indicator {
  background: var(--blue-600);
  border-color: var(--blue-600);
  color: var(--white);
}

.checkbox-indicator svg {
  width: 14px;
  height: 14px;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.checkbox-card.selected .checkbox-indicator svg {
  opacity: 1;
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--slate-700);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--slate-200);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  color: var(--slate-800);
  transition: border-color var(--transition-base);
  background: var(--white);
}

.form-input:focus {
  outline: none;
  border-color: var(--blue-500);
}

.form-input::placeholder {
  color: var(--slate-400);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.diagnosis-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--slate-200);
}

.btn-back {
  color: var(--slate-500);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 16px;
  transition: color var(--transition-base);
}

.btn-back:hover {
  color: var(--slate-800);
}

.btn-back:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* Diagnosis Result */
.diagnosis-result {
  display: none;
}

.diagnosis-result.active {
  display: block;
  animation: fadeInUp 0.4s ease;
}

.result-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--green-50, #ecfdf5);
  border-radius: var(--radius-full);
  color: var(--success);
}

.result-icon svg {
  width: 32px;
  height: 32px;
}

.result-title {
  text-align: center;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--slate-900);
  margin-bottom: var(--space-xs);
}

.result-subtitle {
  text-align: center;
  font-size: 0.9rem;
  color: var(--slate-500);
  margin-bottom: var(--space-lg);
}

.result-recommendations {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: var(--space-lg);
}

.result-rec {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: var(--space-md);
  background: var(--slate-50);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--blue-600);
}

.rec-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue-50);
  border-radius: var(--radius-sm);
  color: var(--blue-600);
  flex-shrink: 0;
}

.rec-icon svg {
  width: 20px;
  height: 20px;
}

.rec-content h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--slate-800);
  margin-bottom: 4px;
}

.rec-content p {
  font-size: 0.85rem;
  color: var(--slate-500);
  line-height: 1.5;
}

.result-cta {
  text-align: center;
  padding: var(--space-lg);
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  color: var(--white);
}

.result-cta h5 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.result-cta p {
  font-size: 0.9rem;
  opacity: 0.9;
  margin-bottom: var(--space-md);
}

/* ===== Solution Packages ===== */
.packages {
  background: var(--white);
}

.package-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  max-width: 1100px;
  margin: 0 auto;
}

.package-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  border: 2px solid var(--slate-200);
  transition: all var(--transition-base);
  position: relative;
  display: flex;
  flex-direction: column;
}

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

.package-card.featured {
  border-color: var(--blue-600);
  box-shadow: var(--shadow-blue);
  transform: scale(1.03);
}

.package-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.package-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 16px;
  background: var(--gradient-primary);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.package-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--slate-900);
  margin-bottom: var(--space-xs);
}

.package-target {
  font-size: 0.85rem;
  color: var(--slate-500);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--slate-200);
}

.package-features {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: var(--space-lg);
}

.package-feature {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--slate-600);
}

.package-feature svg {
  width: 20px;
  height: 20px;
  color: var(--blue-600);
  flex-shrink: 0;
  margin-top: 2px;
}

.package-card .btn {
  margin-top: auto;
}

/* ===== Case Studies ===== */
.cases {
  background: var(--slate-50);
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.case-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--slate-200);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

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

.case-header {
  padding: var(--space-md) var(--space-lg);
  background: var(--gradient-dark);
  color: var(--white);
}

.case-industry {
  display: inline-flex;
  padding: 3px 10px;
  background: rgba(59, 130, 246, 0.2);
  color: var(--blue-300);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 8px;
}

.case-company {
  font-size: 1.1rem;
  font-weight: 700;
}

.case-body {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.case-section {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.case-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--blue-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.case-text {
  font-size: 0.875rem;
  color: var(--slate-600);
  line-height: 1.6;
}

.case-products {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.case-product-tag {
  padding: 3px 10px;
  background: var(--blue-50);
  color: var(--blue-600);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
}

.case-results {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--slate-50);
  border-radius: var(--radius-md);
  margin-top: auto;
}

.case-metric {
  text-align: center;
}

.case-metric-num {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.case-metric-label {
  font-size: 0.7rem;
  color: var(--slate-500);
  margin-top: 2px;
}

/* ===== Growth Academy ===== */
.academy {
  background: var(--white);
}

.academy-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.academy-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--slate-200);
  transition: all var(--transition-base);
  cursor: pointer;
}

.academy-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--blue-200);
}

.academy-img {
  height: 140px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.academy-img::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.3) 100%);
}

.academy-img svg {
  width: 48px;
  height: 48px;
  color: rgba(255, 255, 255, 0.9);
  z-index: 1;
}

.academy-category {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 3px 10px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--blue-600);
  font-size: 0.7rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  z-index: 2;
}

.academy-content {
  padding: var(--space-md);
}

.academy-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--slate-800);
  line-height: 1.5;
  margin-bottom: var(--space-xs);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.academy-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75rem;
  color: var(--slate-400);
}

/* ===== About Section ===== */
.about {
  background: var(--gradient-dark);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.about::before {
  content: '';
  position: absolute;
  top: -300px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.about-content {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.about-text h3 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: var(--space-md);
  line-height: 1.4;
}

.about-text h3 span {
  background: var(--gradient-primary-light);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-text p {
  font-size: 1rem;
  color: var(--slate-400);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.about-philosophy {
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: var(--space-lg);
}

.about-philosophy p {
  font-size: 1.05rem;
  color: var(--slate-300);
  font-style: italic;
  margin-bottom: 0;
}

.about-philosophy p strong {
  color: var(--blue-300);
  font-style: normal;
}

.about-advantages {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.advantage-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: var(--space-sm) var(--space-md);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--slate-300);
}

.advantage-item svg {
  width: 20px;
  height: 20px;
  color: var(--blue-400);
  flex-shrink: 0;
}

.about-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-visual svg {
  width: 100%;
  max-width: 400px;
  height: auto;
}

/* ===== Final CTA ===== */
.final-cta {
  background: var(--gradient-primary);
  padding: var(--space-3xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: '';
  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, 0.1) 0%, transparent 50%);
}

.final-cta-content {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
}

.final-cta h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--white);
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.final-cta p {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-xl);
}

.final-cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Footer ===== */
.footer {
  background: var(--slate-950);
  color: var(--slate-400);
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-brand .nav-logo {
  color: var(--white);
  margin-bottom: var(--space-md);
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
  max-width: 320px;
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.875rem;
}

.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-contact-item svg {
  width: 18px;
  height: 18px;
  color: var(--blue-400);
  flex-shrink: 0;
}

.footer-col h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--space-md);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul a {
  font-size: 0.875rem;
  color: var(--slate-400);
  transition: color var(--transition-base);
}

.footer-col ul a:hover {
  color: var(--blue-400);
}

.footer-bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.825rem;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom a {
  color: var(--slate-500);
  transition: color var(--transition-base);
}

.footer-bottom a:hover {
  color: var(--blue-400);
}

/* ===== Scroll Animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ===== Floating Contact Widget ===== */
.float-contact {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.float-btn {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-blue);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
}

.float-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.5);
}

.float-btn svg {
  width: 24px;
  height: 24px;
}

.float-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-full);
  border: 2px solid var(--blue-400);
  animation: pulse-ring 2s ease-out infinite;
}

.float-btn-wechat {
  background: #07c160;
}

.float-btn-wechat:hover {
  background: #06ad56;
  box-shadow: 0 8px 24px rgba(7, 193, 96, 0.45);
}

.float-btn-wechat::before {
  border-color: #07c160;
}

.float-btn-top {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition: all var(--transition-base);
}

.float-btn-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.float-btn-top:hover {
  background: var(--gradient-primary);
  transform: translateY(-4px);
}

.float-wechat-popup {
  position: absolute;
  right: 64px;
  bottom: 60px;
  background: var(--white);
  border-radius: 14px;
  padding: 18px 16px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
  text-align: center;
  width: 180px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px) scale(0.95);
  transition: all var(--transition-base);
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.float-wechat-popup.active {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.float-wechat-popup img {
  width: 148px;
  height: 148px;
  border-radius: 8px;
  display: block;
  margin: 0 auto 10px;
  background: #fff;
}

.float-wechat-popup p {
  font-size: 0.875rem;
  color: var(--slate-900);
  font-weight: 600;
  margin-bottom: 4px;
}

.float-wechat-tip {
  font-size: 0.7rem;
  color: var(--slate-500);
  display: block;
}

.float-wechat-popup::after {
  content: '';
  position: absolute;
  right: -8px;
  bottom: 22px;
  width: 16px;
  height: 16px;
  background: var(--white);
  transform: rotate(45deg);
  border-right: 1px solid rgba(0, 0, 0, 0.06);
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 2px;
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content {
    order: 2;
  }

  .hero-visual {
    order: 1;
    margin-bottom: var(--space-lg);
  }

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

  .hero-actions,
  .hero-stats {
    justify-content: center;
  }

  .solution-content {
    grid-template-columns: 1fr;
  }

  .solution-visual {
    order: -1;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

  .package-card.featured {
    transform: none;
  }

  .package-card.featured:hover {
    transform: translateY(-6px);
  }
}

@media (max-width: 768px) {
  :root {
    --space-3xl: 4rem;
    --space-2xl: 3rem;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--white);
    flex-direction: column;
    padding: 80px 24px 24px;
    gap: 16px;
    transition: right var(--transition-base);
    box-shadow: var(--shadow-xl);
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-menu a {
    color: var(--slate-700);
    font-size: 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-cta {
    display: none;
  }

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

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

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

  .academy-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .hero-stats {
    flex-wrap: wrap;
    gap: var(--space-md);
  }

  .option-grid,
  .option-grid.cols-3 {
    grid-template-columns: 1fr;
  }

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

  .form-row {
    grid-template-columns: 1fr;
  }

  .solution-capabilities {
    grid-template-columns: 1fr;
  }

  .about-advantages {
    grid-template-columns: 1fr;
  }

  .float-contact {
    bottom: 20px;
    right: 20px;
  }
}

@media (max-width: 480px) {
  .academy-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }
}