/* ==========================================================================
   Kuppi.ai Design System & Styling
   ========================================================================== */

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

:root {
  /* Color Palette */
  --bg-primary: #0a0d14;
  --bg-secondary: #101522;
  --bg-card: rgba(20, 26, 43, 0.7);
  --bg-card-hover: rgba(28, 36, 58, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.03);
  
  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-secondary: #ec4899;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;

  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --gradient-card: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(236, 72, 153, 0.05) 100%);
  --gradient-glow: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.25) 0%, transparent 70%);
  --gradient-border: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.03) 100%);

  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #818cf8;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.5);

  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 25px -3px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 40px -5px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.35);

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 35%, rgba(236, 72, 153, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 50% 80%, rgba(6, 182, 212, 0.08) 0%, transparent 50%);
  background-attachment: fixed;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 5.5vw, 4.2rem); }
h2 { font-size: clamp(2rem, 3.5vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 2vw, 1.6rem); }
h4 { font-size: 1.15rem; }

p {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

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

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

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.8rem;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-normal);
  border: none;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.6);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: #ffffff;
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1.05rem 2.2rem;
  font-size: 1.1rem;
}

.btn-sm {
  padding: 0.55rem 1.2rem;
  font-size: 0.9rem;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: var(--text-accent);
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulse 2s infinite;
}

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

/* Glass Cards */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition-normal);
  position: relative;
}

.glass-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md), 0 0 25px rgba(99, 102, 241, 0.1);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 13, 20, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-normal);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: #ffffff;
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--gradient-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.nav-links a:hover {
  color: #ffffff;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: #ffffff;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 5rem 0 4rem;
  position: relative;
  text-align: center;
}

.hero-content {
  max-width: 860px;
  margin: 0 auto;
}

.hero-section h1 {
  margin: 1.5rem 0 1.25rem;
  letter-spacing: -0.02em;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2.2rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.telco-partners {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.partner-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* App Mockup Showcase */
.mockup-container {
  margin-top: 4rem;
  position: relative;
}

.mockup-glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  height: 350px;
  background: radial-gradient(ellipse, rgba(99, 102, 241, 0.35), transparent 70%);
  filter: blur(50px);
  z-index: 0;
  pointer-events: none;
}

.mockup-wrapper {
  position: relative;
  z-index: 1;
  background: rgba(16, 21, 34, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: 0 30px 60px -10px rgba(0, 0, 0, 0.8), var(--shadow-glow);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
  text-align: left;
}

.mockup-feature-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.chat-preview {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.chat-bubble {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  max-width: 90%;
  line-height: 1.5;
}

.chat-bubble.user {
  background: rgba(99, 102, 241, 0.2);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #ffffff;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.chat-bubble.ai {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: #e2e8f0;
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.chat-bubble.ai strong {
  color: var(--accent-cyan);
}

/* ==========================================================================
   Stats Section
   ========================================================================== */
.stats-section {
  padding: 3rem 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.01);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-item h3 {
  font-size: 2.5rem;
  margin-bottom: 0.25rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-item p {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ==========================================================================
   Features Section
   ========================================================================== */
.section {
  padding: 6rem 0;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.5rem;
}

.section-header h2 {
  margin: 1rem 0 1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--accent-primary);
}

.feature-card h3 {
  margin-bottom: 0.75rem;
}

.feature-card p {
  font-size: 0.98rem;
  line-height: 1.6;
}

/* ==========================================================================
   Interactive Demo Section
   ========================================================================== */
.demo-section {
  background: linear-gradient(180deg, rgba(16, 21, 34, 0.4) 0%, rgba(10, 13, 20, 0.9) 100%);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.interactive-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
  max-width: 800px;
  margin: 0 auto;
}

.demo-tabs {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1rem;
}

.demo-tab-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-fast);
}

.demo-tab-btn.active {
  background: var(--gradient-primary);
  color: #ffffff;
}

/* Flashcard Demo */
.flashcard-demo {
  perspective: 1000px;
  min-height: 240px;
  cursor: pointer;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 240px;
  text-align: center;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

.flashcard-demo.flipped .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-front, .flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.flashcard-front {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(20, 26, 43, 0.9) 100%);
}

.flashcard-back {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(20, 26, 43, 0.9) 100%);
  transform: rotateY(180deg);
  border-color: rgba(16, 185, 129, 0.3);
}

.flashcard-tag {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.flashcard-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 1.5rem;
}

/* ==========================================================================
   Pricing & Carrier Billing Section
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.pricing-card.popular {
  border-color: rgba(99, 102, 241, 0.5);
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08) 0%, rgba(20, 26, 43, 0.85) 100%);
  position: relative;
}

.popular-badge {
  position: absolute;
  top: -12px;
  right: 24px;
  background: var(--gradient-primary);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.8rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.price-tag {
  font-size: 2.8rem;
  font-family: var(--font-heading);
  font-weight: 800;
  color: #ffffff;
  margin: 1.25rem 0 0.5rem;
}

.price-tag span {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
}

.pricing-features {
  list-style: none;
  margin: 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.98rem;
}

.pricing-features li i {
  color: var(--accent-emerald);
  font-size: 1.1rem;
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  overflow: hidden;
  transition: var(--transition-normal);
}

.faq-item.active {
  border-color: rgba(99, 102, 241, 0.4);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
  padding: 0 1.5rem;
}

.faq-item.active .faq-answer {
  padding-bottom: 1.25rem;
}

.faq-answer p {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   CTA Section
   ========================================================================== */
.cta-box {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.25) 0%, rgba(236, 72, 153, 0.15) 100%);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-xl);
  padding: 4rem 2rem;
  text-align: center;
  max-width: 960px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.cta-box h2 {
  margin-bottom: 1rem;
}

.cta-box p {
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto 2.2rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: rgba(8, 10, 16, 0.95);
  border-top: 1px solid var(--border-subtle);
  padding: 4.5rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand p {
  margin-top: 1rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 320px;
}

.footer-col h4 {
  color: #ffffff;
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.footer-links a:hover {
  color: var(--accent-primary);
  padding-left: 4px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-bottom a {
  color: var(--text-muted);
}

.footer-bottom a:hover {
  color: #ffffff;
}

/* ==========================================================================
   Policy & Legal Document Pages
   ========================================================================== */
.policy-header {
  padding: 4rem 0 2.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.01);
}

.policy-header h1 {
  margin: 1rem 0 0.5rem;
}

.policy-body {
  padding: 3.5rem 0 5rem;
}

.policy-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 3rem;
}

.policy-section {
  margin-bottom: 2.5rem;
}

.policy-section h2 {
  font-size: 1.45rem;
  margin-bottom: 1rem;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.policy-section h3 {
  font-size: 1.15rem;
  margin: 1.25rem 0 0.5rem;
  color: var(--text-accent);
}

.policy-section p {
  margin-bottom: 1rem;
  line-height: 1.75;
}

.policy-section ul {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.policy-section ul li {
  line-height: 1.6;
}

.policy-highlight-box {
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.policy-highlight-box strong {
  color: #ffffff;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .mockup-wrapper {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .nav-links, .nav-actions .btn-secondary {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .mobile-menu.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 76px;
    left: 0;
    width: 100%;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-subtle);
    padding: 1.5rem;
    gap: 1.25rem;
  }
  .policy-card {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}