/* ========================================
   ALPARAI DESIGN SYSTEM
   Premium, Stripe-quality visual design
   ======================================== */

/* === RESET & BASE === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors */
  --color-primary: #0A192F;
  --color-accent: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;
  --color-info: #3B82F6;
  --color-purple: #8B5CF6;
  
  /* Grays */
  --color-gray-50: #F9FAFB;
  --color-gray-100: #F3F4F6;
  --color-gray-200: #E5E7EB;
  --color-gray-300: #D1D5DB;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-800: #1F2937;
  --color-gray-900: #111827;
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-blur: 20px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 30px rgba(16, 185, 129, 0.3);
  
  /* Typography */
  --font-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  background: linear-gradient(135deg, #0A192F 0%, #1a2332 100%);
  color: white;
  line-height: 1.6;
  overflow-x: hidden;
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }

@media (max-width: 768px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
  h3 { font-size: 1.5rem; }
}

/* === LAYOUT === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-sm {
  padding: 3rem 0;
}

/* === NAVIGATION === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 25, 47, 0.9);
  backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
  padding: 1rem 0;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-accent) 0%, #22D3EE 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

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

.nav-link {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

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

.lang-switcher {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s ease;
}

.lang-switcher:hover {
  background: rgba(16, 185, 129, 0.2);
  border-color: var(--color-accent);
}

/* === BUTTONS === */
.btn {
  display: inline-block;
  padding: 0.875rem 1.75rem;
  border-radius: 0.75rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent) 0%, #059669 100%);
  color: white;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(16, 185, 129, 0.5);
}

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

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--color-accent);
}

.btn-ghost {
  background: transparent;
  color: var(--color-accent);
  padding: 0.5rem 1rem;
}

.btn-ghost:hover {
  background: rgba(16, 185, 129, 0.1);
}

/* === CARDS === */
.card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: 1rem;
  padding: 2rem;
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card-highlight {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
}

/* === BADGES === */
.badge {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.badge-accent {
  background: rgba(16, 185, 129, 0.2);
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.2);
  color: var(--color-warning);
  border: 1px solid var(--color-warning);
}

.badge-danger {
  background: rgba(239, 68, 68, 0.2);
  color: var(--color-danger);
  border: 1px solid var(--color-danger);
}

/* === HERO SECTION === */
.hero {
  padding: 10rem 0 6rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.15) 0%, transparent 70%);
  animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  margin-bottom: 1.5rem;
}

.hero-title {
  margin-bottom: 1rem;
  background: linear-gradient(135deg, white 0%, rgba(255, 255, 255, 0.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.7);
  max-width: 700px;
  margin: 0 auto 2rem;
}

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

/* === STATS GRID === */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

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

.stat-value {
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-accent) 0%, #22D3EE 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  color: rgba(255, 255, 255, 0.7);
  margin-top: 0.5rem;
}

/* === LEADERBOARD === */
.leaderboard-tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--glass-border);
  flex-wrap: wrap;
}

.tab {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.6);
  padding: 1rem 1.5rem;
  cursor: pointer;
  font-weight: 600;
  border-bottom: 3px solid transparent;
  transition: all 0.3s ease;
}

.tab.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 2rem;
}

.leaderboard-table th {
  text-align: left;
  padding: 1rem;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 600;
  border-bottom: 1px solid var(--glass-border);
}

.leaderboard-table td {
  padding: 1.25rem 1rem;
  border-bottom: 1px solid var(--glass-border);
}

.leaderboard-table tr:hover {
  background: rgba(255, 255, 255, 0.05);
}

.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
  font-weight: 700;
}

.rank-1 { background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%); color: #000; }
.rank-2 { background: linear-gradient(135deg, #C0C0C0 0%, #808080 100%); color: #000; }
.rank-3 { background: linear-gradient(135deg, #CD7F32 0%, #8B4513 100%); color: #fff; }

.model-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.model-name {
  font-weight: 700;
  font-size: 1.1rem;
}

.model-provider {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.875rem;
}

.score-badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-weight: 700;
  font-size: 1.5rem;
}

.score-high {
  background: rgba(16, 185, 129, 0.2);
  color: var(--color-accent);
}

.score-medium {
  background: rgba(245, 158, 11, 0.2);
  color: var(--color-warning);
}

.score-low {
  background: rgba(239, 68, 68, 0.2);
  color: var(--color-danger);
}

.trend-icon {
  font-size: 1.25rem;
}

.trend-up { color: var(--color-accent); }
.trend-down { color: var(--color-danger); }
.trend-stable { color: var(--color-gray-600); }

/* === CALCULATOR === */
.calculator {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
  border: 2px solid var(--glass-border);
  border-radius: 1.5rem;
  padding: 3rem;
  margin: 3rem 0;
}

.slider-group {
  margin: 2rem 0;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
  font-weight: 600;
}

.slider-value {
  color: var(--color-accent);
  font-size: 1.5rem;
  font-weight: 800;
}

input[type="range"] {
  width: 100%;
  height: 0.5rem;
  border-radius: 0.25rem;
  background: var(--glass-bg);
  outline: none;
  -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer;
  box-shadow: var(--shadow-glow);
}

input[type="range"]::-moz-range-thumb {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  border: none;
}

.scenario-buttons {
  display: flex;
  gap: 1rem;
  margin: 2rem 0;
  flex-wrap: wrap;
}

.scenario-btn {
  flex: 1;
  min-width: 150px;
  padding: 1rem;
  border: 2px solid var(--glass-border);
  background: var(--glass-bg);
  color: white;
  border-radius: 0.75rem;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s ease;
}

.scenario-btn.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.calculator-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 2px solid var(--glass-border);
}

.result-item h4 {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
  text-transform: uppercase;
}

.result-value {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-accent) 0%, #22D3EE 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* === TEAM SECTION === */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.team-card {
  text-align: center;
  position: relative;
}

.team-photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1.5rem;
  border: 4px solid var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.team-name {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.team-title {
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 1rem;
}

.team-bio {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.linkedin-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: #0077B5;
  color: white;
  text-decoration: none;
  border-radius: 0.5rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.linkedin-btn:hover {
  background: #005582;
  transform: translateY(-2px);
}

/* === FOOTER === */
.footer {
  background: rgba(0, 0, 0, 0.3);
  border-top: 1px solid var(--glass-border);
  padding: 3rem 0 2rem;
  margin-top: 5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-col h4 {
  margin-bottom: 1rem;
  color: var(--color-accent);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-link {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--glass-border);
  color: rgba(255, 255, 255, 0.5);
}

/* === UTILITIES === */
.text-center { text-align: center; }
.text-accent { color: var(--color-accent); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .nav-links {
    gap: 1rem;
  }
  
  .hero {
    padding: 7rem 0 4rem;
  }
  
  .section {
    padding: 3rem 0;
  }
  
  .calculator {
    padding: 2rem 1.5rem;
  }
  
  .leaderboard-table {
    font-size: 0.875rem;
  }
  
  .leaderboard-table td,
  .leaderboard-table th {
    padding: 0.75rem 0.5rem;
  }
}

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

.fade-in {
  animation: fadeInUp 0.6s ease-out;
}

/* === CHART CONTAINER === */
.chart-container {
  max-width: 600px;
  margin: 2rem auto;
  padding: 2rem;
  background: var(--glass-bg);
  border-radius: 1rem;
  border: 1px solid var(--glass-border);
}