/* ============================================
   StarTrek — Global Design System
   ISRO BAH 2026 | Team Star Trek
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ---- Design Tokens ---- */
:root {
  /* Apple Minimal Light Palette */
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f7;
  --bg-tertiary: #e8e8ed;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.7);

  /* Accent colors (Subtle Apple-style) */
  --accent-purple: #5e5ce6;
  --accent-purple-glow: rgba(94, 92, 230, 0.2);
  --accent-blue: #007aff;
  --accent-blue-glow: rgba(0, 122, 255, 0.2);
  --accent-cyan: #32ade6;
  --accent-teal: #30b0c7;
  --accent-green: #34c759;
  --accent-amber: #ff9f0a;
  --accent-orange: #ff9500;
  --accent-red: #ff3b30;
  --accent-pink: #ff2d55;

  /* AQI scale colors (Apple-standard) */
  --aqi-good: #34c759;
  --aqi-satisfactory: #32ade6;
  --aqi-moderate: #ffcc00;
  --aqi-poor: #ff9500;
  --aqi-very-poor: #ff3b30;
  --aqi-severe: #a30000;

  /* Text */
  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #86868b;
  --text-accent: #007aff;

  /* Borders */
  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-glass: rgba(255, 255, 255, 0.4);
  --border-active: rgba(0, 0, 0, 0.15);

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #1d1d1f 0%, #6e6e73 100%);
  --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(255,255,255,0.6));
  --gradient-glow: radial-gradient(ellipse at center, rgba(0, 122, 255, 0.05) 0%, transparent 70%);
  --gradient-mesh: radial-gradient(at 20% 80%, rgba(0, 122, 255, 0.04) 0%, transparent 50%),
    radial-gradient(at 80% 20%, rgba(94, 92, 230, 0.04) 0%, transparent 50%),
    radial-gradient(at 50% 50%, rgba(52, 199, 89, 0.03) 0%, transparent 50%);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-glow-purple: 0 4px 12px rgba(94, 92, 230, 0.15);
  --shadow-glow-cyan: 0 4px 12px rgba(0, 122, 255, 0.15);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-index scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-tooltip: 500;
}

/* ---- Typography ---- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 3rem);
}

h3 {
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
}

h4 {
  font-size: clamp(1.1rem, 2vw, 1.25rem);
}

p {
  color: var(--text-secondary);
}

.mono {
  font-family: 'JetBrains Mono', monospace;
}

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

/* ---- Glass Card ---- */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.glass-card:hover {
  border-color: var(--border-active);
  box-shadow: var(--shadow-glow-purple);
  transform: translateY(-2px);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: #1d1d1f;
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 0 50px rgba(124, 58, 237, 0.5);
}

.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn-primary:hover::after {
  opacity: 1;
}

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

.btn-outline:hover {
  border-color: var(--accent-purple);
  background: rgba(124, 58, 237, 0.1);
}

/* ---- Badges / Tags ---- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-purple {
  background: rgba(124, 58, 237, 0.15);
  color: var(--accent-purple);
  border: 1px solid rgba(124, 58, 237, 0.3);
}

.badge-cyan {
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.badge-green {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-amber {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* ---- Utility ---- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-4xl) 0;
  position: relative;
}

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

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-sm {
  gap: var(--space-sm);
}

.gap-md {
  gap: var(--space-md);
}

.gap-lg {
  gap: var(--space-lg);
}

.gap-xl {
  gap: var(--space-xl);
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-purple);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: #9461f7;
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-40px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse-glow {

  0%,
  100% {
    opacity: 0.6;
  }

  50% {
    opacity: 1;
  }
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0px);
  }

  50% {
    transform: translateY(-12px);
  }
}

@keyframes orbit {
  from {
    transform: rotate(0deg) translateX(120px) rotate(0deg);
  }

  to {
    transform: rotate(360deg) translateX(120px) rotate(-360deg);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }

  100% {
    background-position: 200% 0;
  }
}

@keyframes spin-slow {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

.animate-fade-in-up {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.animate-fade-in {
  opacity: 0;
  animation: fadeIn 0.5s ease forwards;
}

/* Staggered animation delays */
.delay-1 {
  animation-delay: 0.1s;
}

.delay-2 {
  animation-delay: 0.2s;
}

.delay-3 {
  animation-delay: 0.3s;
}

.delay-4 {
  animation-delay: 0.4s;
}

.delay-5 {
  animation-delay: 0.5s;
}

.delay-6 {
  animation-delay: 0.6s;
}

/* Scroll-driven reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Selection ---- */
::selection {
  background: rgba(124, 58, 237, 0.4);
  color: white;
}

/* ---- Link Defaults ---- */
a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-purple);
}

/* ---- Image defaults ---- */
img {
  max-width: 100%;
  display: block;
}

/* ---- Code ---- */
code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  background: rgba(124, 58, 237, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text-accent);
}