/* ========================================
   豆包 GEO 优化官网 - 样式表
   风格：白色系、Vercel 简洁风格、豆包蓝强调
   ======================================== */

/* CSS Variables */
:root {
  /* 色彩系统 */
  --color-white: #ffffff;
  --color-bg: #ffffff;
  --color-bg-subtle: #f5f7fa;
  --color-bg-elevated: #fafafa;
  --color-black: #171717;
  --color-gray-900: #1f2937;
  --color-gray-700: #374151;
  --color-gray-600: #4d4d4d;
  --color-gray-500: #6b7280;
  --color-gray-400: #9ca3af;
  --color-gray-300: #d1d5db;
  --color-gray-200: #e5e7eb;
  --color-gray-100: #ebebeb;
  --color-gray-50: #f3f4f6;
  
  /* 豆包蓝强调色 */
  --color-primary: #0066ff;
  --color-primary-hover: #0052cc;
  --color-primary-light: #e6f0ff;
  
  /* 功能色 */
  --color-success: #10b981;
  --color-success-light: #d1fae5;
  --color-purple: #7c3aed;
  --color-purple-light: #ede9fe;
  
  /* 阴影系统 - Vercel 风格 */
  --shadow-border: 0px 0px 0px 1px rgba(0, 0, 0, 0.08);
  --shadow-subtle: 0px 2px 2px rgba(0, 0, 0, 0.04);
  --shadow-card: 0px 0px 0px 1px rgba(0, 0, 0, 0.08), 0px 2px 2px rgba(0, 0, 0, 0.04), 0px 8px 8px -8px rgba(0, 0, 0, 0.08);
  --shadow-card-hover: 0px 0px 0px 1px rgba(0, 0, 0, 0.12), 0px 4px 4px rgba(0, 0, 0, 0.06), 0px 12px 12px -8px rgba(0, 0, 0, 0.1);
  --shadow-focus: 0 0 0 2px hsla(212, 100%, 48%, 1);
  
  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-2xl: 16px;
  --radius-full: 9999px;
  
  /* 间距 */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  
  /* 字体 */
  --font-sans: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, SFMono-Regular, 'SF Mono', Menlo, monospace;
  
  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.2s ease;
  --transition-slow: 0.3s ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-gray-900);
  background-color: var(--color-white);
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

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

ul, ol {
  list-style: none;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-narrow {
  max-width: 800px;
}

/* Typography */
.text-display {
  font-size: 3rem;
  font-weight: 600;
  line-height: 1.0;
  letter-spacing: -2.4px;
}

.text-h1 {
  font-size: 2.5rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -2.4px;
}

.text-h2 {
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -1.28px;
}

.text-h3 {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.33;
  letter-spacing: -0.96px;
}

.text-h4 {
  font-size: 1.25rem;
  font-weight: 500;
  line-height: 1.4;
}

.text-body {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
}

.text-body-lg {
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.6;
}

.text-small {
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.5;
}

.text-caption {
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.33;
}

.text-mono {
  font-family: var(--font-mono);
}

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

.text-primary {
  color: var(--color-gray-900);
}

.text-secondary {
  color: var(--color-gray-500);
}

.text-accent {
  color: var(--color-primary);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-white);
  border-bottom: var(--shadow-border);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-gray-900);
  letter-spacing: -0.5px;
}

.navbar-logo svg {
  width: 32px;
  height: 32px;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.navbar-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-gray-600);
  transition: color var(--transition-fast);
}

.navbar-nav a:hover,
.navbar-nav a.active {
  color: var(--color-gray-900);
}

.navbar-cta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Mobile Menu */
.navbar-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.navbar-toggle:hover {
  background: var(--color-gray-50);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-white);
  padding: var(--space-6);
  z-index: 999;
}

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

.mobile-menu a {
  display: block;
  padding: var(--space-4) 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-gray-700);
  border-bottom: 1px solid var(--color-gray-100);
}

@media (max-width: 768px) {
  .navbar-nav,
  .navbar-cta .btn {
    display: none;
  }
  
  .navbar-toggle {
    display: flex;
  }
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-gray-900);
  color: var(--color-white);
  border: var(--shadow-border);
}

.btn-primary:hover {
  background: var(--color-black);
  color: var(--color-white);
}

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

.btn-primary-blue:hover {
  background: var(--color-primary-hover);
  color: var(--color-white);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-gray-900);
  box-shadow: var(--shadow-border);
}

.btn-secondary:hover {
  background: var(--color-gray-50);
  color: var(--color-gray-900);
}

.btn-ghost {
  background: transparent;
  color: var(--color-gray-700);
}

.btn-ghost:hover {
  background: var(--color-gray-50);
  color: var(--color-gray-900);
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: 1rem;
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: 0.8125rem;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
}

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

/* ========================================
   Cards
   ======================================== */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-6);
  transition: all var(--transition-normal);
}

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

.card-flat {
  box-shadow: none;
  border: var(--shadow-border);
}

.card-flat:hover {
  box-shadow: var(--shadow-subtle);
  transform: none;
}

.card-header {
  margin-bottom: var(--space-4);
}

.card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
}

.card-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-primary);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.card-text {
  font-size: 0.875rem;
  color: var(--color-gray-500);
  line-height: 1.6;
}

/* ========================================
   Badges & Tags
   ======================================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-full);
}

.badge-primary {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-success {
  background: var(--color-success-light);
  color: var(--color-success);
}

.badge-purple {
  background: var(--color-purple-light);
  color: var(--color-purple);
}

.badge-gray {
  background: var(--color-gray-100);
  color: var(--color-gray-600);
}

/* ========================================
   Sections
   ======================================== */
.section {
  padding: var(--space-20) 0;
}

.section-sm {
  padding: var(--space-12) 0;
}

.section-lg {
  padding: var(--space-24) 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-12);
}

.section-title {
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-gray-900);
  letter-spacing: -1.28px;
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-gray-500);
  line-height: 1.6;
}

.section-dark {
  background: var(--color-gray-900);
  color: var(--color-white);
}

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

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

.section-gray {
  background: var(--color-bg-subtle);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  padding-top: calc(64px + var(--space-16));
  padding-bottom: var(--space-20);
  text-align: center;
}

.hero-inner {
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -2.88px;
  color: var(--color-gray-900);
  margin-bottom: var(--space-6);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-gray-500);
  line-height: 1.7;
  max-width: 680px;
  margin: 0 auto var(--space-8);
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-values {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-16);
  padding-top: var(--space-12);
  border-top: 1px solid var(--color-gray-100);
}

.hero-value {
  text-align: center;
}

.hero-value-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-3);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
}

.hero-value-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-primary);
}

.hero-value-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--space-1);
}

.hero-value-text {
  font-size: 0.8125rem;
  color: var(--color-gray-500);
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
    letter-spacing: -2px;
  }
  
  .hero-values {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ========================================
   Stats Section
   ======================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.stat-card {
  text-align: center;
  padding: var(--space-8);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--color-gray-900);
  letter-spacing: -1.5px;
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-gray-500);
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ========================================
   Service Cards
   ======================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.service-card {
  padding: var(--space-8);
}

@media (max-width: 768px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Scenarios Section
   ======================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.scenario-card {
  padding: var(--space-6);
  text-align: center;
  cursor: default;
}

.scenario-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary-light), #dbeafe);
  border-radius: var(--radius-xl);
}

.scenario-icon svg {
  width: 32px;
  height: 32px;
  stroke: var(--color-primary);
}

.scenario-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.scenario-desc {
  font-size: 0.8125rem;
  color: var(--color-gray-500);
  line-height: 1.5;
}

@media (max-width: 768px) {
  .scenarios-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ========================================
   Case Cards
   ======================================== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.case-card {
  padding: var(--space-6);
}

.case-number {
  font-size: 3rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: -2px;
  margin-bottom: var(--space-2);
}

.case-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.case-desc {
  font-size: 0.875rem;
  color: var(--color-gray-500);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .cases-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Pricing Section
   ======================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  align-items: start;
}

.pricing-card {
  padding: var(--space-8);
  position: relative;
}

.pricing-card.featured {
  background: var(--color-white);
  border: 2px solid var(--color-primary);
  box-shadow: var(--shadow-card-hover);
  transform: scale(1.02);
}

.pricing-card.featured::before {
  content: '推荐';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-success);
  color: white;
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.pricing-card.professional {
  border: 1px solid var(--color-purple);
}

.pricing-card.professional::before {
  content: '效果最强';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-purple);
  color: white;
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.pricing-header {
  text-align: center;
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-gray-100);
  margin-bottom: var(--space-6);
}

.pricing-name {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-1);
}

.pricing-price-value {
  font-size: 3rem;
  font-weight: 600;
  color: var(--color-gray-900);
  letter-spacing: -2px;
}

.pricing-price-unit {
  font-size: 1rem;
  color: var(--color-gray-500);
}

.pricing-target {
  font-size: 0.8125rem;
  color: var(--color-gray-500);
  margin-top: var(--space-2);
}

.pricing-features {
  margin-bottom: var(--space-8);
}

.pricing-feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  font-size: 0.875rem;
  color: var(--color-gray-700);
}

.pricing-feature svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-success);
  flex-shrink: 0;
  margin-top: 2px;
}

.pricing-cta {
  width: 100%;
}

@media (max-width: 992px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }
  
  .pricing-card.featured {
    transform: none;
  }
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary), #0052cc);
  color: var(--color-white);
  text-align: center;
}

.cta-title {
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.cta-text {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-8);
}

.cta-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.btn-white {
  background: var(--color-white);
  color: var(--color-primary);
  font-weight: 600;
}

.btn-white:hover {
  background: var(--color-gray-100);
  color: var(--color-primary);
}

.btn-outline-white {
  background: transparent;
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

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

/* ========================================
   FAQ Section
   ======================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-gray-100);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-gray-900);
  text-align: left;
  transition: color var(--transition-fast);
}

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

.faq-question svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-gray-400);
  transition: transform var(--transition-normal);
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.faq-item.active .faq-answer {
  max-height: 200px;
}

.faq-answer-inner {
  padding-bottom: var(--space-5);
  font-size: 0.9375rem;
  color: var(--color-gray-600);
  line-height: 1.7;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.footer-logo svg {
  width: 32px;
  height: 32px;
}

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.footer-qr {
  width: 120px;
  height: 120px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.footer-qr img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.footer-column h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.8125rem;
}

.footer-contact {
  display: flex;
  gap: var(--space-6);
}

.footer-contact a {
  color: var(--color-gray-400);
}

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

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

/* ========================================
   Platform Section (Doubao)
   ======================================== */
.platform-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.platform-content h2 {
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-gray-900);
  letter-spacing: -1.28px;
  margin-bottom: var(--space-4);
}

.platform-content p {
  font-size: 1rem;
  color: var(--color-gray-600);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.platform-features {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.platform-feature {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.9375rem;
  color: var(--color-gray-700);
}

.platform-feature svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-success);
}

.platform-visual {
  background: linear-gradient(135deg, var(--color-primary-light), #dbeafe);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  position: relative;
  overflow: hidden;
}

.chat-mockup {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  padding: var(--space-6);
}

.chat-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-gray-100);
  margin-bottom: var(--space-4);
}

.chat-avatar {
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

.chat-avatar svg {
  width: 24px;
  height: 24px;
  stroke: white;
}

.chat-info h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-gray-900);
}

.chat-info span {
  font-size: 0.75rem;
  color: var(--color-gray-500);
}

.chat-messages {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.chat-message {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  line-height: 1.6;
}

.chat-message.user {
  background: var(--color-gray-100);
  color: var(--color-gray-700);
  align-self: flex-end;
}

.chat-message.ai {
  background: var(--color-primary-light);
  color: var(--color-gray-900);
  border: 1px solid rgba(0, 102, 255, 0.1);
}

.chat-message.ai strong {
  color: var(--color-primary);
}

@media (max-width: 768px) {
  .platform-intro {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Advantages Grid
   ======================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.advantage-card {
  padding: var(--space-6);
}

.advantage-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary-light), #dbeafe);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
}

.advantage-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--color-primary);
}

.advantage-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.advantage-desc {
  font-size: 0.875rem;
  color: var(--color-gray-500);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .advantages-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Contact Form
   ======================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
}

.contact-info {
  padding: var(--space-8);
}

.contact-info h2 {
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-gray-900);
  letter-spacing: -1.28px;
  margin-bottom: var(--space-4);
}

.contact-info p {
  font-size: 1rem;
  color: var(--color-gray-500);
  line-height: 1.7;
  margin-bottom: var(--space-8);
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.contact-method {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.contact-method-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
}

.contact-method-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-primary);
}

.contact-method-info h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--space-1);
}

.contact-method-info a,
.contact-method-info span {
  font-size: 0.875rem;
  color: var(--color-gray-500);
}

.contact-form-wrapper {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  padding: var(--space-8);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-gray-700);
  margin-bottom: var(--space-2);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: 0.9375rem;
  color: var(--color-gray-900);
  background: var(--color-white);
  border: var(--shadow-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Guarantees Section
   ======================================== */
.guarantees-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.guarantee-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.guarantee-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-success-light);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.guarantee-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-success);
}

.guarantee-text {
  font-size: 0.875rem;
  color: var(--color-gray-700);
  line-height: 1.5;
}

@media (max-width: 768px) {
  .guarantees-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Discount Section
   ======================================== */
.discount-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  max-width: 600px;
  margin: 0 auto;
}

.discount-card {
  padding: var(--space-8);
  text-align: center;
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
}

.discount-badge {
  display: inline-block;
  padding: var(--space-1) var(--space-4);
  background: var(--color-success-light);
  color: var(--color-success);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.discount-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.discount-savings {
  font-size: 0.875rem;
  color: var(--color-gray-500);
}

@media (max-width: 768px) {
  .discount-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Page Header
   ======================================== */
.page-header {
  padding-top: calc(64px + var(--space-16));
  padding-bottom: var(--space-16);
  text-align: center;
  background: var(--color-bg-subtle);
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--color-gray-900);
  letter-spacing: -2px;
  margin-bottom: var(--space-4);
}

.page-header p {
  font-size: 1.125rem;
  color: var(--color-gray-500);
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   Utility Classes
   ======================================== */
.flex {
  display: flex;
}

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

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.gap-2 {
  gap: var(--space-2);
}

.gap-4 {
  gap: var(--space-4);
}

.gap-6 {
  gap: var(--space-6);
}

.mt-4 {
  margin-top: var(--space-4);
}

.mt-6 {
  margin-top: var(--space-6);
}

.mt-8 {
  margin-top: var(--space-8);
}

.mb-4 {
  margin-bottom: var(--space-4);
}

.mb-6 {
  margin-bottom: var(--space-6);
}

.mb-8 {
  margin-bottom: var(--space-8);
}

.hidden {
  display: none !important;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in {
  animation: fadeIn 0.4s ease forwards;
}

/* ========================================
   Scrollbar
   ======================================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}