/* ==========================================================================
   O-CHAT LANDING PAGE DESIGN SYSTEM
   Theme Brand Colors:
   - Electric Blue: #0260DA
   - Vibrant Crimson Red: #F91020
   - Emerald Green: #09B944
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  /* Brand Theme Colors */
  --primary-blue: #0260DA;
  --primary-blue-glow: rgba(2, 96, 218, 0.4);
  --accent-red: #F91020;
  --accent-red-glow: rgba(249, 16, 32, 0.4);
  --accent-green: #09B944;
  --accent-green-glow: rgba(9, 185, 68, 0.4);

  /* Background Palette */
  --bg-dark: #070c12;
  --bg-card: #0e1622;
  --bg-card-hover: #142030;
  --bg-glass: rgba(14, 22, 34, 0.75);
  --bg-[#162232]: #162232;

  /* Border & Gradients */
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(2, 96, 218, 0.3);
  --gradient-brand: linear-gradient(135deg, #0260DA 0%, #09B944 50%, #F91020 100%);
  --gradient-blue-green: linear-gradient(135deg, #0260DA 0%, #09B944 100%);
  --gradient-card: linear-gradient(180deg, rgba(22, 34, 50, 0.8) 0%, rgba(14, 22, 34, 0.95) 100%);

  /* Text Colors */
  --text-main: #ffffff;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  /* Typography */
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;

  /* Layout */
  --container-max: 1280px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
}

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

html, body {
  scroll-behavior: smooth;
  font-size: 16px;
  overflow-x: hidden;
  width: 100%;
  max-width: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.25s ease;
  word-break: break-word;
}

ul {
  list-style: none;
}

img, picture, svg, video {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  box-sizing: border-box;
}

/* Typography Helpers */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.2;
}

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

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

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.badge-blue {
  background: rgba(2, 96, 218, 0.15);
  color: #3b82f6;
  border: 1px solid rgba(2, 96, 218, 0.4);
}

.badge-green {
  background: rgba(9, 185, 68, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(9, 185, 68, 0.4);
}

.badge-red {
  background: rgba(249, 16, 32, 0.15);
  color: #f87171;
  border: 1px solid rgba(249, 16, 32, 0.4);
}

/* Pulsing Dot */
.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  position: relative;
}

.pulse-dot.green { background: var(--accent-green); }
.pulse-dot.red { background: var(--accent-red); }
.pulse-dot.blue { background: var(--primary-blue); }

.pulse-dot::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: inherit;
  opacity: 0.6;
  animation: pulse-ring 1.8s infinite ease-out;
}

@keyframes pulse-ring {
  0% { transform: scale(0.8); opacity: 0.8; }
  100% { transform: scale(2.2); opacity: 0; }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 14px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-blue) 0%, #004bb5 100%);
  color: #ffffff;
  box-shadow: 0 8px 24px var(--primary-blue-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px var(--primary-blue-glow);
  filter: brightness(1.1);
}

.btn-green {
  background: linear-gradient(135deg, var(--accent-green) 0%, #079636 100%);
  color: #ffffff;
  box-shadow: 0 8px 24px var(--accent-green-glow);
}

.btn-green:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px var(--accent-green-glow);
  filter: brightness(1.1);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  color: #ffffff;
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.9rem;
  border-radius: 10px;
}

.btn-lg {
  padding: 18px 36px;
  font-size: 1.1rem;
  border-radius: 16px;
}

/* Header Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 20px 0;
  transition: all 0.3s ease;
  backdrop-filter: blur(16px);
  background: rgba(7, 12, 18, 0.6);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.navbar.scrolled {
  padding: 14px 0;
  background: rgba(7, 12, 18, 0.92);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.6rem;
  letter-spacing: -0.5px;
}

.logo-img {
  height: 42px;
  width: 42px;
  object-fit: cover;
  border-radius: 50%;
  box-shadow: 0 0 12px rgba(2, 96, 218, 0.4);
}

.lang-toggle-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  padding: 8px 16px;
  border-radius: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.88rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.25s ease;
}

.lang-toggle-btn:hover {
  background: var(--primary-blue);
  border-color: var(--primary-blue);
  box-shadow: 0 4px 16px var(--primary-blue-glow);
}

.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 0 20px var(--primary-blue-glow);
  position: relative;
}

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Hero Section */
.hero {
  padding: 180px 0 100px;
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at 50% 20%, rgba(2, 96, 218, 0.18) 0%, rgba(7, 12, 18, 0) 60%);
}

.hero-glow-1 {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(2, 96, 218, 0.25) 0%, rgba(9, 185, 68, 0.1) 40%, transparent 70%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  text-align: center;
  max-width: 920px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero-title {
  font-size: 3.8rem;
  font-weight: 900;
  letter-spacing: -1.5px;
  margin: 24px 0 20px;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-preview {
  position: relative;
  margin-top: 40px;
  border-radius: var(--radius-lg);
  padding: 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 25px 80px rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(20px);
}

.hero-preview img {
  border-radius: var(--radius-md);
  width: 100%;
}

/* Stats Section */
.stats-banner {
  padding: 60px 0;
  border-y: 1px solid var(--border-color);
  background: rgba(14, 22, 34, 0.4);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 30px;
  text-align: center;
}

.stat-item h3 {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 4px;
}

.stat-item p {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
}

/* Features Section */
.section {
  padding: 120px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 70px;
}

.section-title {
  font-size: 2.8rem;
  margin: 16px 0;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 32px;
}

.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(2, 96, 218, 0.5);
  box-shadow: 0 20px 50px rgba(2, 96, 218, 0.15);
}

.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 24px;
}

.feature-icon.blue { background: rgba(2, 96, 218, 0.15); color: #3b82f6; }
.feature-icon.red { background: rgba(249, 16, 32, 0.15); color: var(--accent-red); }
.feature-icon.green { background: rgba(9, 185, 68, 0.15); color: var(--accent-green); }

.feature-card h3 {
  font-size: 1.4rem;
  margin-bottom: 14px;
}

/* Fluid Typography Helpers */
.hero-title {
  font-size: clamp(1.75rem, 5vw + 0.8rem, 3.8rem);
  font-weight: 900;
  letter-spacing: -1px;
  margin: 24px 0 20px;
  line-height: 1.15;
  word-break: break-word;
  overflow-wrap: break-word;
}

.hero-subtitle {
  font-size: clamp(0.95rem, 2vw + 0.4rem, 1.25rem);
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.6;
  word-break: break-word;
}

.section-title {
  font-size: clamp(1.6rem, 4vw + 0.6rem, 2.8rem);
  margin: 16px 0;
  letter-spacing: -0.5px;
  word-break: break-word;
  overflow-wrap: break-word;
}

.section-desc {
  font-size: clamp(0.9rem, 1.5vw + 0.4rem, 1.15rem);
  color: var(--text-muted);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 28px;
}

.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(2, 96, 218, 0.5);
  box-shadow: 0 20px 50px rgba(2, 96, 218, 0.15);
}

.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 24px;
}

.feature-icon.blue { background: rgba(2, 96, 218, 0.15); color: #3b82f6; }
.feature-icon.red { background: rgba(249, 16, 32, 0.15); color: var(--accent-red); }
.feature-icon.green { background: rgba(9, 185, 68, 0.15); color: var(--accent-green); }

.feature-card h3 {
  font-size: 1.35rem;
  margin-bottom: 14px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Screenshots Showcase Section (7 Screenshot Slots) */
.screenshots-section {
  background: radial-gradient(circle at 50% 50%, rgba(9, 185, 68, 0.08) 0%, transparent 70%);
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 28px;
}

.screenshot-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.35s ease;
  width: 100%;
  max-width: 100%;
}

.screenshot-card:hover {
  transform: translateY(-8px);
  border-color: rgba(9, 185, 68, 0.5);
  box-shadow: 0 25px 60px rgba(9, 185, 68, 0.15);
}

.screenshot-img-box {
  width: 100%;
  height: 240px;
  background: #000;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.screenshot-img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.screenshot-card:hover .screenshot-img-box img {
  transform: scale(1.05);
}

.screenshot-info {
  padding: 24px;
}

.screenshot-info h4 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.screenshot-info p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* How It Works */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 28px;
  margin-top: 50px;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  position: relative;
  width: 100%;
  max-width: 100%;
}

.step-number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--gradient-blue-green);
  color: white;
  font-weight: 900;
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 28px;
  margin-top: 50px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 44px 36px;
  position: relative;
  transition: all 0.35s ease;
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(2, 96, 218, 0.15) 0%, rgba(14, 22, 34, 0.95) 100%);
  border-color: var(--primary-blue);
  transform: scale(1.04);
}

.pricing-header {
  margin-bottom: 30px;
}

.pricing-price {
  font-size: 3.2rem;
  font-weight: 900;
  margin: 16px 0 8px;
}

.pricing-features {
  margin: 30px 0;
  space-y: 14px;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.pricing-feature-item.active {
  color: var(--text-main);
  font-weight: 600;
}

/* Mobile App Download Section */
.download-box {
  background: linear-gradient(135deg, rgba(2, 96, 218, 0.2) 0%, rgba(9, 185, 68, 0.15) 100%);
  border: 1px solid rgba(2, 96, 218, 0.4);
  border-radius: var(--radius-lg);
  padding: clamp(28px, 5vw, 60px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  width: 100%;
  box-sizing: border-box;
}

.download-info h2 {
  font-size: clamp(1.5rem, 4vw + 0.5rem, 2.6rem);
  margin-bottom: 16px;
  word-break: break-word;
}

.download-info p {
  font-size: clamp(0.9rem, 2vw + 0.3rem, 1.05rem);
  line-height: 1.7;
}

.download-btn-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.download-btn-group .btn {
  flex: 1 1 auto;
  min-width: 180px;
  text-align: center;
  justify-content: center;
}

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

.download-image img {
  width: 100%;
  max-width: 340px;
  height: auto;
  border-radius: 20px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  object-fit: contain;
}

/* FAQ Accordion */
.faq-grid {
  max-width: 860px;
  margin: 50px auto 0;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
}

.faq-question {
  padding: 24px;
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-answer {
  padding: 0 24px 24px;
  color: var(--text-muted);
  font-size: 0.98rem;
  display: none;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-item.active .faq-question {
  color: #3b82f6;
}

/* Footer */
.footer {
  background: #04080c;
  padding: 80px 0 30px;
  border-top: 1px solid var(--border-color);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 60px;
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* Mobile Drawer Action Buttons */
.mobile-nav-buttons {
  display: none;
  width: 100%;
  flex-direction: column;
  gap: 12px;
  margin-top: 10px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
  display: none;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  font-size: 1.2rem;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.mobile-menu-toggle:hover {
  background: var(--primary-blue);
  border-color: var(--primary-blue);
}

/* Responsive Breakpoints */
@media (max-width: 992px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .nav-actions .btn {
    display: none;
  }

  .mobile-nav-buttons {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    background: #0b131d;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    flex-direction: column;
    align-items: stretch;
    padding: 24px;
    gap: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.85);
    display: none;
    z-index: 999;
  }

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

  .hero {
    padding: 130px 0 60px;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.05rem;
  }

  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

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

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

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

  .download-box {
    grid-template-columns: 1fr;
    padding: 32px 20px;
    text-align: center;
  }

  .download-btn-group {
    justify-content: center;
  }

  .download-btn-group .btn {
    min-width: unset;
    width: 100%;
  }

  .download-image img {
    max-width: 260px;
    margin: 0 auto;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .pricing-card.featured {
    transform: scale(1);
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 14px;
  }

  .section {
    padding: 56px 0;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .nav-actions {
    gap: 6px;
  }

  .btn-sm {
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  .lang-toggle-btn {
    padding: 6px 10px;
    font-size: 0.8rem;
  }

  .pricing-card {
    padding: 24px 16px;
  }

  .pricing-price {
    font-size: 2.4rem;
  }

  .screenshot-img-box {
    height: 200px;
  }

  .download-box {
    padding: 24px 16px;
  }

  .download-btn-group .btn {
    width: 100%;
    min-width: unset;
  }

  .download-image img {
    max-width: 220px;
  }

  .faq-question {
    font-size: 1rem;
    padding: 18px 16px;
  }

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

  .footer {
    padding: 50px 0 24px;
  }
}