/* ===================================
   Premium Visual Design System
   Linear.app Inspired - a-ask.io
   =================================== */

/* CSS Custom Properties - Premium Theme */
:root {
  /* Dark Theme Base */
  --bg-primary: #0A0A0F;
  --bg-secondary: #111118;
  --bg-tertiary: #16161D;
  --bg-elevated: #1C1C24;
  --bg-card: rgba(255, 255, 255, 0.03);
  
  /* Accent Colors */
  --accent-blue: #5E6AD2;
  --accent-purple: #9D7CD8;
  --accent-cyan: #7DCFFF;
  --accent-pink: #F472B6;
  
  /* Brand Integration */
  --brand-primary: #3B82F6;
  --brand-accent: #F97316;
  
  /* Text Colors */
  --text-primary: #FFFFFF;
  --text-secondary: #A1A1AA;
  --text-muted: #71717A;
  --text-dim: #52525B;
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-bg-hover: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-border-hover: rgba(255, 255, 255, 0.12);
  --glass-blur: 20px;
  
  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 50%, #F97316 100%);
  --gradient-blue-purple: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);
  --gradient-purple-pink: linear-gradient(135deg, #8B5CF6 0%, #F472B6 100%);
  --gradient-orange: linear-gradient(135deg, #F97316 0%, #FB923C 100%);
  
  /* Shadows */
  --shadow-glow-blue: 0 0 60px rgba(59, 130, 246, 0.3);
  --shadow-glow-purple: 0 0 60px rgba(139, 92, 246, 0.3);
  --shadow-glow-orange: 0 0 60px rgba(249, 115, 22, 0.3);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.6);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* 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);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ===================================
   Reset & Base Styles
   =================================== */

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

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

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

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

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

.text-glow {
  text-shadow: 0 0 40px rgba(59, 130, 246, 0.5);
}

/* ===================================
   Navigation - Premium White Header
   =================================== */

.nav-premium {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0.5rem 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
  transition: all var(--transition-base);
}

.nav-premium.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.12);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
}

.nav-logo img {
  height: 120px;
  width: auto;
  margin: -30px 0;
}

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

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  color: #374151;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
  position: relative;
}

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

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

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

.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: #374151;
  transition: all var(--transition-fast);
}

@media (min-width: 768px) {
  .mobile-menu-btn {
    display: none;
  }
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-fast);
}

/* ===================================
   Hero Section - Premium
   =================================== */

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

/* Animated Gradient Orbs */
.gradient-orbs {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.5;
  animation: float 25s ease-in-out infinite;
}

.orb-1 {
  width: 800px;
  height: 800px;
  background: var(--brand-primary);
  top: -300px;
  left: -200px;
}

.orb-2 {
  width: 600px;
  height: 600px;
  background: var(--accent-purple);
  bottom: -200px;
  right: -100px;
  animation-delay: -8s;
}

.orb-3 {
  width: 500px;
  height: 500px;
  background: var(--brand-accent);
  top: 40%;
  left: 60%;
  animation-delay: -15s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(60px, -60px) scale(1.1); }
  50% { transform: translate(-40px, 40px) scale(0.9); }
  75% { transform: translate(50px, 50px) scale(1.05); }
}

/* Grid Pattern Overlay */
.grid-pattern {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 1000px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  backdrop-filter: blur(10px);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: #22C55E;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

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

.hero-title {
  font-size: clamp(3rem, 10vw, 5.5rem);
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 3rem;
  line-height: 1.6;
}

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

/* ===================================
   Premium Buttons
   =================================== */

.btn-premium {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary-premium {
  background: var(--gradient-blue-purple);
  color: white;
  box-shadow: var(--shadow-glow-blue);
}

.btn-primary-premium:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 80px rgba(59, 130, 246, 0.5);
}

.btn-secondary-premium {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
}

.btn-secondary-premium:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  transform: translateY(-2px);
}

/* ===================================
   Section Styles
   =================================== */

.section-premium {
  padding: 8rem 2rem;
  position: relative;
}

.section-container {
  max-width: 1400px;
  margin: 0 auto;
}

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

.section-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--brand-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ===================================
   Glass Cards
   =================================== */

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 2rem;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, transparent 50%);
  pointer-events: none;
}

.glass-card:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  transform: translateY(-8px);
  box-shadow: var(--shadow-card-hover);
}

/* Card with Glow Border */
.glow-card {
  position: relative;
}

.glow-card::after {
  content: '';
  position: absolute;
  inset: -1px;
  background: var(--gradient-blue-purple);
  border-radius: inherit;
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.glow-card:hover::after {
  opacity: 0.5;
  filter: blur(20px);
}

/* ===================================
   Features Grid
   =================================== */

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

@media (min-width: 768px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  padding: 2.5rem;
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.feature-icon.blue { background: linear-gradient(135deg, rgba(59, 130, 246, 0.2) 0%, rgba(59, 130, 246, 0.1) 100%); }
.feature-icon.purple { background: linear-gradient(135deg, rgba(139, 92, 246, 0.2) 0%, rgba(139, 92, 246, 0.1) 100%); }
.feature-icon.orange { background: linear-gradient(135deg, rgba(249, 115, 22, 0.2) 0%, rgba(249, 115, 22, 0.1) 100%); }

.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;
  margin-bottom: 1.5rem;
}

.feature-list {
  list-style: none;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding: 0.5rem 0;
}

.feature-list li::before {
  content: '→';
  color: var(--brand-primary);
  font-weight: 600;
}

/* ===================================
   About Section
   =================================== */

.about-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.about-card {
  text-align: center;
  padding: 3rem 2rem;
}

.about-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.5rem;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-icon svg {
  width: 32px;
  height: 32px;
}

.about-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

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

.values-list {
  list-style: none;
  text-align: left;
  margin-top: 1rem;
}

.values-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
  color: var(--text-secondary);
}

.values-list li svg {
  width: 18px;
  height: 18px;
  color: var(--accent-purple);
  flex-shrink: 0;
}

/* ===================================
   Technology Section
   =================================== */

.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

@media (min-width: 768px) {
  .tech-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.tech-card {
  padding: 1.5rem;
  text-align: center;
}

.tech-emoji {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.tech-name {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

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

/* ===================================
   CTA Section
   =================================== */

.cta-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
}

.cta-content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.cta-title {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 1rem;
}

.cta-description {
  color: var(--text-secondary);
  font-size: 1.125rem;
  margin-bottom: 2rem;
}

/* ===================================
   Footer - Premium
   =================================== */

.footer-premium {
  background: var(--bg-secondary);
  border-top: 1px solid var(--glass-border);
  padding: 4rem 2rem 2rem;
}

.footer-container {
  max-width: 1400px;
  margin: 0 auto;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--glass-border);
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
}

.footer-copyright {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-legal {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1rem;
}

.footer-legal a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

.footer-legal a:hover {
  color: var(--text-secondary);
}

/* ===================================
   Back to Top
   =================================== */

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  color: var(--text-primary);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--glass-bg-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow-blue);
}

/* ===================================
   Scroll Animations
   =================================== */

.animate-on-scroll {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }
.stagger-6 { transition-delay: 0.6s; }

/* ===================================
   Responsive Adjustments
   =================================== */

@media (max-width: 767px) {
  .hero-premium {
    padding: 6rem 1.5rem 3rem;
  }
  
  .section-premium {
    padding: 5rem 1.5rem;
  }
  
  .glass-card {
    padding: 1.5rem;
  }
  
  .feature-card {
    padding: 2rem;
  }
  
  .orb {
    filter: blur(80px);
    opacity: 0.3;
  }
  
  .orb-1 { width: 400px; height: 400px; }
  .orb-2 { width: 300px; height: 300px; }
  .orb-3 { width: 250px; height: 250px; }
}

/* ===================================
   Utility Classes
   =================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}