/* Premium Dark Theme - AI TG Business Platform */

/* Fade-in animation */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

:root {
  /* Colors */
  --bg-primary: #0B0C10;
  --bg-secondary: #1A1B26;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --accent-blue: #0169FE;
  --accent-blue-light: #4D9AFF;
  --accent-green: #ACD200;
  --accent-red: #FF5000;
  --text-primary: #FFFFFF;
  --text-secondary: #A2A4AB;
  --text-muted: #6B7280;
  --border-color: rgba(255, 255, 255, 0.08);
  --glass-bg: rgba(11, 12, 16, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);

  /* Typography */
  --font-heading: 'Clash Display', 'Inter', sans-serif;
  --font-body: 'DM Sans', 'Inter', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 4rem;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

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

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(1, 105, 254, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Grid */
  --container-max: 1440px;
  --container-padding: 80px;
  --grid-columns: 12;
  --grid-gap: 20px;
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: var(--font-size-6xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
  color: var(--text-secondary);
  line-height: 1.7;
}

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

a:hover {
  color: var(--accent-blue-light);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: 500;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-blue-light) 100%);
  color: white;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 60px rgba(1, 105, 254, 0.5);
  color: white;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-blue);
  color: var(--text-primary);
}

/* Glass Card */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
}

.glass-card:hover {
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-glow);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(11, 12, 16, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-heading);
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-blue-light) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-2xl);
}

.nav-link {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

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

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at center, rgba(1, 105, 254, 0.15) 0%, transparent 50%);
  animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text h1 {
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text p {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-2xl);
  max-width: 500px;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
}

.hero-stats {
  display: flex;
  gap: var(--spacing-3xl);
  margin-top: var(--spacing-3xl);
}

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

.stat-value {
  font-family: var(--font-heading);
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--accent-blue);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
}

/* Phone Mockup */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.phone-mockup {
  width: 320px;
  height: 640px;
  background: var(--bg-secondary);
  border-radius: 40px;
  padding: 12px;
  box-shadow: var(--shadow-lg), 0 0 100px rgba(1, 105, 254, 0.2);
  position: relative;
  transform: perspective(1000px) rotateY(-10deg) rotateX(5deg);
  transition: transform var(--transition-slow);
}

.phone-mockup:hover {
  transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.phone-screen {
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  border-radius: 32px;
  overflow: hidden;
  position: relative;
}

.phone-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.phone-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2;
  pointer-events: none;
}

.phone-overlay-bar {
  background: rgba(11, 12, 16, 0.92);
  backdrop-filter: blur(8px);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.phone-overlay-text {
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.3px;
}

/* Features Section */
.features {
  padding: var(--spacing-3xl) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-badge {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--accent-blue);
  margin-bottom: var(--spacing-md);
}

.section-title {
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.feature-card {
  padding: var(--spacing-2xl);
  text-align: center;
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-lg);
  background: linear-gradient(135deg, rgba(1, 105, 254, 0.2) 0%, rgba(1, 105, 254, 0.1) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  stroke: var(--accent-blue);
}

.feature-card h3 {
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-xl);
}

.feature-card p {
  font-size: var(--font-size-base);
}

/* Screenshots Section */
.screenshots {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.screenshot-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 9/16;
  background: var(--bg-primary);
}

.screenshot-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* How It Works */
.how-it-works {
  padding: var(--spacing-3xl) 0;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.step-card {
  text-align: center;
  padding: var(--spacing-2xl);
}

.step-number {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-lg);
  background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-blue-light) 100%);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: white;
}

.step-card h3 {
  margin-bottom: var(--spacing-md);
}

/* Pricing Section */
.pricing {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.pricing-card {
  padding: var(--spacing-2xl);
  text-align: center;
  position: relative;
}

.pricing-card.featured {
  border-color: var(--accent-blue);
  transform: scale(1.05);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: var(--spacing-xs) var(--spacing-md);
  background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-blue-light) 100%);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-name {
  font-family: var(--font-heading);
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-md);
}

.pricing-price {
  font-family: var(--font-heading);
  font-size: var(--font-size-5xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.pricing-price span {
  font-size: var(--font-size-base);
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  margin: var(--spacing-xl) 0;
  text-align: left;
}

.pricing-features li {
  padding: var(--spacing-sm) 0;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.pricing-features li::before {
  content: '';
  width: 20px;
  height: 20px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%230169FE'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M5 13l4 4L19 7'/%3E%3C/svg%3E") no-repeat center;
  flex-shrink: 0;
}

/* Reviews Section */
.reviews {
  padding: var(--spacing-3xl) 0;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.review-card {
  padding: var(--spacing-2xl);
}

.review-stars {
  color: #FFC107;
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
}

.review-text {
  font-style: italic;
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.review-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-blue-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: white;
}

.review-name {
  font-weight: 600;
  color: var(--text-primary);
}

.review-role {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Contact Section */
.contact {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

.contact-cta {
  text-align: center;
  padding: var(--spacing-3xl) 0;
}

.contact-note {
  margin-top: var(--spacing-lg);
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

/* Footer */
.footer {
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-3xl);
}

.footer-brand p {
  margin-top: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.footer-column h4 {
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-base);
}

.footer-column ul {
  list-style: none;
}

.footer-column li {
  margin-bottom: var(--spacing-sm);
}

.footer-column a {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.footer-column a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Responsive */
@media (max-width: 1200px) {
  :root {
    --container-padding: 40px;
  }

  h1 { font-size: var(--font-size-5xl); }
  h2 { font-size: var(--font-size-3xl); }
}

@media (max-width: 992px) {
  :root {
    --container-padding: 24px;
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-text p {
    margin: 0 auto var(--spacing-2xl);
  }

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

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

  .hero-visual {
    margin-top: var(--spacing-3xl);
  }

  .phone-mockup {
    transform: none;
  }

  .features-grid,
  .screenshots-grid,
  .steps-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
  }

  h1 { font-size: var(--font-size-4xl); }
  h2 { font-size: var(--font-size-2xl); }

  .nav {
    display: none;
  }

  .features-grid,
  .screenshots-grid,
  .steps-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-xl);
  }
}

@media (max-width: 480px) {
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-xl); }

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

  .btn {
    width: 100%;
  }
}