/* ============================================
   B20 Modern Landing Page - CSS
   Design System: Gradients, Glassmorphism, Animations
   ============================================ */

/* === CSS Variables === */
:root {
  /* Colors */
  --color-primary: #667eea;
  --color-primary-dark: #5568d3;
  --color-secondary: #764ba2;
  --color-accent: #f093fb;
  --color-success: #4facfe;
  --color-warning: #fee140;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  --gradient-card: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
  
  /* Neutrals */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

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

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

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

/* === Container === */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* === Navigation === */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-md);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.navbar__logo img {
  height: 40px;
  width: auto;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.navbar__link {
  font-weight: 500;
  color: var(--color-gray-700);
  position: relative;
}

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

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

.navbar__link:hover::after {
  width: 100%;
}

.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
}

.navbar__toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-gray-800);
  transition: all var(--transition-base);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
}

.btn--primary {
  background: var(--gradient-primary);
  color: var(--color-white);
  box-shadow: 0 4px 14px 0 rgba(102, 126, 234, 0.4);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(102, 126, 234, 0.5);
}

.btn--secondary {
  background: var(--color-white);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--secondary:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn--lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

/* === Hero Section === */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  overflow: hidden;
}

.hero__background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-hero);
  opacity: 0.05;
  z-index: -1;
}

.hero__background::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(102, 126, 234, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 20s ease-in-out infinite;
}

.hero__background::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(240, 147, 251, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 15s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(30px, -30px) rotate(120deg); }
  66% { transform: translate(-20px, 20px) rotate(240deg); }
}

.hero__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  padding: var(--spacing-3xl) 0;
}

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

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.5rem 1rem;
  background: rgba(102, 126, 234, 0.1);
  border: 1px solid rgba(102, 126, 234, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

.hero__logo {
  max-width: 400px;
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 0.8s ease-out;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero__title-text {
  display: block;
  margin-top: var(--spacing-md);
}

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

.hero__subtitle {
  font-size: 1.25rem;
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero__cta {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

.hero__stats {
  display: flex;
  gap: var(--spacing-xl);
  animation: fadeInUp 0.8s ease-out 0.8s both;
}

.stat {
  text-align: center;
}

.stat__number {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.stat__label {
  font-size: 0.875rem;
  color: var(--color-gray-600);
  font-weight: 500;
}

/* Hero Visual */
.hero__visual {
  position: relative;
  animation: fadeInRight 1s ease-out 0.4s both;
}

.phone-mockup {
  position: relative;
  width: 300px;
  height: 600px;
  margin: 0 auto;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 40px;
  padding: 12px;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
}

.phone-mockup__screen {
  width: 100%;
  height: 100%;
  background: var(--color-white);
  border-radius: 32px;
  overflow: hidden;
}

.app-preview {
  padding: 20px;
}

.app-preview__header {
  height: 60px;
  background: linear-gradient(90deg, var(--color-gray-100) 0%, var(--color-gray-200) 100%);
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
}

.app-preview__content {
  height: 400px;
  background: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-gray-100) 100%);
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
}

.app-preview__footer {
  height: 60px;
  background: linear-gradient(90deg, var(--color-gray-100) 0%, var(--color-gray-200) 100%);
  border-radius: var(--radius-lg);
}

.floating-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 1rem 1.5rem;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  animation: floatCard 3s ease-in-out infinite;
}

.floating-card--1 {
  top: 10%;
  right: -20%;
  animation-delay: 0s;
}

.floating-card--2 {
  bottom: 15%;
  right: -15%;
  animation-delay: 1.5s;
}

@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.floating-card__icon {
  font-size: 1.5rem;
}

.floating-card__text {
  font-weight: 600;
  color: var(--color-gray-800);
  white-space: nowrap;
}

.hero__scroll {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
}

.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-gray-500);
  font-size: 0.875rem;
  font-weight: 500;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* === Animations === */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* === Sections === */
.section {
  padding: var(--spacing-3xl) 0;
}

.section--dark {
  background: linear-gradient(180deg, var(--color-gray-900) 0%, var(--color-gray-800) 100%);
  color: var(--color-white);
}

.section--faq {
  background: var(--color-gray-50);
}

.section__header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--spacing-3xl);
}

.section__label {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(102, 126, 234, 0.1);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.section--dark .section__label {
  background: rgba(102, 126, 234, 0.2);
  color: var(--color-accent);
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

.section__subtitle {
  font-size: 1.125rem;
  color: var(--color-gray-600);
  line-height: 1.8;
}

.section--dark .section__subtitle {
  color: var(--color-gray-300);
}

/* === Steps === */
.steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-lg);
  align-items: start;
  max-width: 1100px;
  margin: 0 auto;
}

.step {
  position: relative;
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
}

.step:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-2xl);
}

.step__number {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  color: var(--color-white);
  font-weight: 800;
  font-size: 1.25rem;
  border-radius: 50%;
  box-shadow: var(--shadow-lg);
}

.step__icon {
  font-size: 3rem;
  margin: var(--spacing-md) 0;
}

.step__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.step__description {
  color: var(--color-gray-600);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.step__connector {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 80px;
}

.step__connector::before {
  content: '→';
  font-size: 2rem;
  color: var(--color-primary);
  font-weight: 800;
}

/* === Benefits === */
.benefits {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
}

.benefit-card {
  padding: var(--spacing-xl);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-2xl);
  transition: all var(--transition-base);
}

.benefit-card:hover {
  transform: translateY(-8px);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.benefit-card__icon {
  margin-bottom: var(--spacing-md);
}

.benefit-card__title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.benefit-card__description {
  color: var(--color-gray-300);
  line-height: 1.7;
}

/* === Audience Cards === */
.audience {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.audience-card {
  padding: var(--spacing-xl);
  background: var(--color-white);
  border: 2px solid var(--color-gray-100);
  border-radius: var(--radius-2xl);
  transition: all var(--transition-base);
}

.audience-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-2xl);
  transform: translateY(-8px);
}

.audience-card__header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.audience-card__icon {
  font-size: 2.5rem;
}

.audience-card__title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
}

.audience-card__description {
  color: var(--color-gray-600);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.audience-card__list {
  list-style: none;
  margin-bottom: var(--spacing-md);
}

.audience-card__list li {
  padding: var(--spacing-xs) 0;
  color: var(--color-gray-700);
  font-weight: 500;
}

.audience-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-primary);
  font-weight: 600;
  transition: all var(--transition-base);
}

.audience-card__link:hover {
  gap: var(--spacing-sm);
}

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

.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.faq-item:hover {
  box-shadow: var(--shadow-md);
}

.faq-item__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  font-size: 1.125rem;
  font-weight: 600;
  text-align: left;
  color: var(--color-gray-800);
  cursor: pointer;
  transition: all var(--transition-base);
}

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

.faq-item__question svg {
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.faq-item__question[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

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

.faq-item__question[aria-expanded="true"] + .faq-item__answer {
  max-height: 500px;
}

.faq-item__answer p {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  color: var(--color-gray-600);
  line-height: 1.7;
}

/* === CTA Section === */
.cta-section {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
}

.cta-box {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  padding: var(--spacing-3xl);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-2xl);
  overflow: hidden;
}

.cta-box__content {
  z-index: 1;
}

.cta-box__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.cta-box__subtitle {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.7;
  margin-bottom: var(--spacing-xl);
}

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

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

.cta-box__buttons .btn--secondary {
  background: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

.cta-box__visual {
  position: relative;
  height: 400px;
}

.cta-box__circle {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  animation: float 20s ease-in-out infinite;
}

.cta-box__circle--1 {
  width: 300px;
  height: 300px;
  top: 0;
  right: 0;
}

.cta-box__circle--2 {
  width: 200px;
  height: 200px;
  bottom: 20%;
  right: 30%;
  animation-delay: 5s;
}

.cta-box__circle--3 {
  width: 150px;
  height: 150px;
  top: 40%;
  right: 10%;
  animation-delay: 10s;
}

/* === Footer === */
.footer {
  background: var(--color-gray-900);
  color: var(--color-gray-300);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer__main {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-gray-800);
}

.footer__logo {
  height: 40px;
  width: auto;
  margin-bottom: var(--spacing-md);
}

.footer__tagline {
  color: var(--color-gray-400);
  line-height: 1.7;
}

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

.footer__heading {
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.footer__link {
  display: block;
  padding: var(--spacing-xs) 0;
  color: var(--color-gray-400);
  transition: color var(--transition-base);
}

.footer__link:hover {
  color: var(--color-white);
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-lg);
}

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

.footer__legal {
  display: flex;
  gap: var(--spacing-lg);
}

/* === Responsive === */
@media (max-width: 1024px) {
  .hero__content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .hero__visual {
    order: -1;
  }
  
  .phone-mockup {
    width: 250px;
    height: 500px;
  }
  
  .floating-card {
    display: none;
  }
  
  .steps {
    grid-template-columns: 1fr;
  }
  
  .step__connector {
    display: none;
  }
  
  .cta-box {
    grid-template-columns: 1fr;
  }
  
  .cta-box__visual {
    display: none;
  }
  
  .footer__main {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .navbar__links {
    display: none;
  }
  
  .navbar__toggle {
    display: flex;
  }
  
  .hero__cta {
    flex-direction: column;
  }
  
  .hero__stats {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .benefits,
  .audience {
    grid-template-columns: 1fr;
  }
  
  .footer__links {
    grid-template-columns: 1fr;
  }
  
  .footer__bottom {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
}