/* ========================================
   Delta Landing Page - Professional Styles
   ======================================== */

/* Base Reset & Variables */
:root {
  --primary: #fff6b3;
  --primary-dark: #e6dc9e;
  --bg-dark: #0a0a0a;
  --bg-card: #111111;
  --bg-card-hover: #1a1a1a;
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.5);
  --border-color: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(255, 255, 255, 0.2);
  --gradient-primary: linear-gradient(135deg, #fff6b3 0%, #ffd700 100%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 0;
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.nav-logo-img {
  width: 45px;
  height: 45px;
  object-fit: contain;
  transition: transform var(--transition-normal);
}

.nav-logo:hover .nav-logo-img {
  transform: rotate(10deg) scale(1.05);
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
}

.nav-logo-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.nav-logo-subtitle {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2.5rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

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

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

.nav-link:hover::after {
  width: 100%;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-normal);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0.65rem 1.5rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--primary);
  color: #000;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(255, 246, 179, 0.3);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-hover);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--text-secondary);
}

.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1rem;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 8rem 2rem 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top, rgba(255, 246, 179, 0.05) 0%, transparent 50%),
              radial-gradient(ellipse at bottom right, rgba(255, 246, 179, 0.03) 0%, transparent 40%);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.5rem 1rem;
  background: rgba(255, 246, 179, 0.1);
  border: 1px solid rgba(255, 246, 179, 0.2);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--primary);
  margin-bottom: 2rem;
  animation: fadeInDown 0.8s ease;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  letter-spacing: -2px;
  animation: fadeInUp 0.8s ease 0.2s backwards;
}

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

.hero-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  animation: fadeInUp 0.8s ease 0.4s backwards;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 4rem;
  animation: fadeInUp 0.8s ease 0.6s backwards;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  animation: fadeInUp 0.8s ease 0.8s backwards;
}

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

.stat-number {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border-color);
}

/* Hero Visual */
.hero-visual {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  width: 400px;
  height: 400px;
  z-index: 1;
  opacity: 0.15;
}

.hero-visual-ring {
  position: absolute;
  border: 1px solid var(--primary);
  border-radius: 50%;
  opacity: 0.3;
}

.ring-1 {
  width: 100%;
  height: 100%;
  animation: ringPulse 4s ease-in-out infinite;
}

.ring-2 {
  width: 75%;
  height: 75%;
  top: 12.5%;
  left: 12.5%;
  animation: ringPulse 4s ease-in-out infinite 1s;
}

.ring-3 {
  width: 50%;
  height: 50%;
  top: 25%;
  left: 25%;
  animation: ringPulse 4s ease-in-out infinite 2s;
}

.hero-visual-logo {
  position: absolute;
  width: 30%;
  height: 30%;
  top: 35%;
  left: 35%;
  object-fit: contain;
  filter: sepia(100%) saturate(300%) hue-rotate(30deg) brightness(1.2);
}

/* ========================================
   Sections Common
   ======================================== */
.section {
  padding: 6rem 2rem;
  position: relative;
}

.section-container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-tag {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: rgba(255, 246, 179, 0.1);
  border: 1px solid rgba(255, 246, 179, 0.2);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 1rem;
}

.section-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   Features Section
   ======================================== */
.features-section {
  background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-card) 100%);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  transition: all var(--transition-normal);
  opacity: 0;
  transform: translateY(30px);
}

.feature-card.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.feature-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 246, 179, 0.1);
  border-radius: 12px;
  margin-bottom: 1.25rem;
  color: var(--primary);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.feature-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ========================================
   How It Works Section
   ======================================== */
.how-it-works-section {
  background: var(--bg-card);
}

.steps-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
}

.step-card {
  flex: 1;
  max-width: 320px;
  text-align: center;
  padding: 2rem;
  opacity: 0;
  transform: translateY(30px);
}

.step-card.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.step-number {
  font-size: 4rem;
  font-weight: 800;
  color: var(--primary);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: 1rem;
}

.step-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.step-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.step-connector {
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--border-hover), transparent);
}

/* ========================================
   About Section
   ======================================== */
.about-section {
  background: var(--bg-dark);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-text {
  opacity: 0;
  transform: translateX(-30px);
}

.about-text.animate-in {
  opacity: 1;
  transform: translateX(0);
}

.about-text .section-tag {
  margin-bottom: 1rem;
}

.about-text .section-title {
  text-align: left;
  margin-bottom: 1.5rem;
}

.about-description {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 1rem;
  line-height: 1.8;
}

.about-features {
  list-style: none;
  margin-top: 2rem;
}

.about-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0.75rem 0;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}

.about-features li:last-child {
  border-bottom: none;
}

.about-features svg {
  color: var(--primary);
  flex-shrink: 0;
}

.about-visual {
  opacity: 0;
  transform: translateX(30px);
}

.about-visual.animate-in {
  opacity: 1;
  transform: translateX(0);
}

.about-visual-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
}

.about-image {
  width: 100%;
  height: auto;
  border-radius: 12px;
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
  background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-card) 50%, var(--bg-dark) 100%);
}

.cta-content {
  text-align: center;
  padding: 4rem;
  background: linear-gradient(135deg, rgba(255, 246, 179, 0.05) 0%, transparent 100%);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  opacity: 0;
  transform: scale(0.95);
}

.cta-content.animate-in {
  opacity: 1;
  transform: scale(1);
}

.cta-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.cta-description {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 2rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 4rem 2rem 2rem;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-main {
  display: flex;
  justify-content: space-between;
  gap: 4rem;
  margin-bottom: 3rem;
}

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

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 1rem;
}

.footer-logo img {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.footer-logo span {
  font-size: 1.25rem;
  font-weight: 700;
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 4rem;
}

.footer-column h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

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

.footer-column li {
  margin-bottom: 0.5rem;
}

.footer-column a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.2);
  }
}

@keyframes ringPulse {
  0%, 100% {
    opacity: 0.3;
    transform: scale(1);
  }
  50% {
    opacity: 0.1;
    transform: scale(1.05);
  }
}

/* Animation delays for feature cards */
.feature-card:nth-child(1) { transition-delay: 0s; }
.feature-card:nth-child(2) { transition-delay: 0.1s; }
.feature-card:nth-child(3) { transition-delay: 0.2s; }
.feature-card:nth-child(4) { transition-delay: 0.3s; }
.feature-card:nth-child(5) { transition-delay: 0.4s; }
.feature-card:nth-child(6) { transition-delay: 0.5s; }

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
  .hero-visual {
    display: none;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .about-text .section-title {
    text-align: center;
  }
  
  .about-text {
    text-align: center;
  }
  
  .about-features li {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .nav-menu,
  .nav-actions {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(20px);
    padding: 2rem;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal);
  }
  
  .nav-menu.active,
  .nav-actions.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  
  .nav-actions {
    top: auto;
    bottom: 0;
    padding-bottom: 3rem;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .hero {
    padding: 7rem 1.5rem 3rem;
    min-height: auto;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .stat-divider {
    width: 60px;
    height: 1px;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .steps-grid {
    flex-direction: column;
    gap: 1rem;
  }
  
  .step-connector {
    width: 2px;
    height: 40px;
    background: linear-gradient(180deg, transparent, var(--border-hover), transparent);
  }
  
  .footer-main {
    flex-direction: column;
    gap: 2rem;
  }
  
  .footer-links {
    flex-wrap: wrap;
    gap: 2rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .section {
    padding: 4rem 1rem;
  }
  
  .cta-content {
    padding: 2rem 1.5rem;
  }
  
  .btn-lg {
    padding: 0.8rem 1.5rem;
    font-size: 0.95rem;
  }
}