/* ============================================
   AIML IGNITE 2026 — Global Design System
   Dark Theme | Blue-Purple Gradient | Glassmorphism
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ============================================
   1. CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ============================================ */
:root {
  /* ---- Color Palette ---- */
  --color-bg-primary:    #06060f;
  --color-bg-secondary:  #0c0c1d;
  --color-bg-tertiary:   #12122a;
  --color-surface:       #1a1a35;
  --color-surface-hover: #22224a;

  /* Glass */
  --glass-bg:            rgba(255, 255, 255, 0.04);
  --glass-bg-hover:      rgba(255, 255, 255, 0.08);
  --glass-border:        rgba(255, 255, 255, 0.08);
  --glass-border-hover:  rgba(255, 255, 255, 0.15);

  /* Accent gradients */
  --gradient-primary:    linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary:  linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #a855f7 100%);
  --gradient-accent:     linear-gradient(135deg, #06b6d4 0%, #3b82f6 50%, #8b5cf6 100%);
  --gradient-hero:       linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
  --gradient-warm:       linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
  --gradient-success:    linear-gradient(135deg, #10b981 0%, #059669 100%);
  --gradient-danger:     linear-gradient(135deg, #ef4444 0%, #dc2626 100%);

  /* Solid colors */
  --color-primary:       #818cf8;
  --color-primary-dark:  #6366f1;
  --color-primary-light: #a5b4fc;
  --color-secondary:     #a78bfa;
  --color-accent:        #c084fc;
  --color-success:       #34d399;
  --color-warning:       #fbbf24;
  --color-danger:        #f87171;
  --color-info:          #38bdf8;

  /* Text */
  --text-primary:        #f1f5f9;
  --text-secondary:      #94a3b8;
  --text-tertiary:       #64748b;
  --text-muted:          #475569;
  --text-inverse:        #0f172a;

  /* ---- Typography ---- */
  --font-heading:        'Space Grotesk', sans-serif;
  --font-body:           'Inter', sans-serif;
  --font-mono:           'JetBrains Mono', monospace;

  --text-xs:   0.75rem;    /* 12px */
  --text-sm:   0.875rem;   /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg:   1.125rem;   /* 18px */
  --text-xl:   1.25rem;    /* 20px */
  --text-2xl:  1.5rem;     /* 24px */
  --text-3xl:  1.875rem;   /* 30px */
  --text-4xl:  2.25rem;    /* 36px */
  --text-5xl:  3rem;       /* 48px */
  --text-6xl:  3.75rem;    /* 60px */
  --text-7xl:  4.5rem;     /* 72px */

  --leading-tight:  1.25;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  /* ---- Spacing ---- */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* ---- Borders & Radius ---- */
  --radius-sm:   0.375rem;
  --radius-md:   0.5rem;
  --radius-lg:   0.75rem;
  --radius-xl:   1rem;
  --radius-2xl:  1.5rem;
  --radius-full: 9999px;

  --border-width: 1px;

  /* ---- Shadows ---- */
  --shadow-sm:    0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md:    0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg:    0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-xl:    0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  --shadow-2xl:   0 25px 50px -12px rgba(0, 0, 0, 0.6);
  --shadow-glow:  0 0 20px rgba(129, 140, 248, 0.3);
  --shadow-glow-lg: 0 0 40px rgba(129, 140, 248, 0.4), 0 0 80px rgba(167, 139, 250, 0.2);

  /* ---- 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:   350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* ---- Z-index ---- */
  --z-dropdown: 1000;
  --z-sticky:   1020;
  --z-fixed:    1030;
  --z-modal-backdrop: 1040;
  --z-modal:    1050;
  --z-popover:  1060;
  --z-tooltip:  1070;
  --z-toast:    1080;

  /* ---- Layout ---- */
  --container-max: 1280px;
  --sidebar-width: 280px;
  --navbar-height: 72px;
}

/* ============================================
   2. RESET & BASE STYLES
   ============================================ */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg-primary);
  border-left: 1px solid var(--glass-border);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--color-primary-dark) 0%, var(--color-secondary) 100%);
  border-radius: var(--radius-full);
  border: 2.5px solid var(--color-bg-primary);
}
::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-accent) 100%);
}

/* ---- Selection ---- */
::selection {
  background: rgba(129, 140, 248, 0.3);
  color: var(--text-primary);
}

/* ---- Links ---- */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--color-primary-light);
}

/* ---- Images ---- */
img, svg {
  max-width: 100%;
  display: block;
}

/* ---- Lists ---- */
ul, ol {
  list-style: none;
}

/* ---- Headings ---- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: var(--leading-tight);
  color: var(--text-primary);
}
h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

/* ============================================
   3. UTILITY CLASSES
   ============================================ */

/* ---- Container ---- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ---- Text Alignment ---- */
.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }

/* ---- Flex ---- */
.flex          { display: flex; }
.flex-col      { flex-direction: column; }
.flex-wrap     { flex-wrap: wrap; }
.items-center  { align-items: center; }
.items-start   { align-items: flex-start; }
.items-end     { align-items: flex-end; }
.justify-center   { justify-content: center; }
.justify-between  { justify-content: space-between; }
.justify-end      { justify-content: flex-end; }
.gap-1  { gap: var(--space-1); }
.gap-2  { gap: var(--space-2); }
.gap-3  { gap: var(--space-3); }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }
.gap-8  { gap: var(--space-8); }

/* ---- Grid ---- */
.grid       { display: grid; }
.grid-2     { grid-template-columns: repeat(2, 1fr); }
.grid-3     { grid-template-columns: repeat(3, 1fr); }
.grid-4     { grid-template-columns: repeat(4, 1fr); }

/* ---- Spacing ---- */
.mt-4  { margin-top: var(--space-4); }
.mt-6  { margin-top: var(--space-6); }
.mt-8  { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mb-4  { margin-bottom: var(--space-4); }
.mb-6  { margin-bottom: var(--space-6); }
.mb-8  { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.p-4   { padding: var(--space-4); }
.p-6   { padding: var(--space-6); }
.p-8   { padding: var(--space-8); }

/* ---- Visibility ---- */
.hidden    { display: none !important; }
.sr-only   { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

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

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

/* ---- Glassmorphism ---- */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: var(--border-width) solid var(--glass-border);
  border-radius: var(--radius-xl);
}
.glass:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
}

.glass-strong {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: var(--border-width) solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-xl);
}

/* ---- Section ---- */
.section {
  padding: var(--space-24) 0;
  position: relative;
}

.section-title {
  font-size: var(--text-4xl);
  font-weight: 800;
  text-align: center;
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-16);
}

/* ---- Divider ---- */
.divider {
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  margin: var(--space-6) auto var(--space-8);
}

/* ============================================
   4. ANIMATIONS & KEYFRAMES
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

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

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

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

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

@keyframes slideUp {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

@keyframes slideDown {
  from { transform: translateY(-100%); }
  to   { transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.5; }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 20px rgba(129, 140, 248, 0.3); }
  50%      { box-shadow: 0 0 40px rgba(129, 140, 248, 0.6), 0 0 80px rgba(167, 139, 250, 0.3); }
}

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

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes bounceIn {
  0%   { opacity: 0; transform: scale(0.3); }
  50%  { opacity: 1; transform: scale(1.05); }
  70%  { transform: scale(0.95); }
  100% { transform: scale(1); }
}

@keyframes ripple {
  0%   { transform: scale(0); opacity: 0.5; }
  100% { transform: scale(4); opacity: 0; }
}

/* ---- Scroll Reveal ---- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal-left.revealed {
  opacity: 1;
  transform: translateX(0);
}
.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal-right.revealed {
  opacity: 1;
  transform: translateX(0);
}
.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal-scale.revealed {
  opacity: 1;
  transform: scale(1);
}

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

/* ============================================
   5. LOADING SCREEN
   ============================================ */
.page-loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--color-bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}
.page-loader.loaded {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-logo {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-8);
  animation: pulse 1.5s ease-in-out infinite;
}

.loader-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--glass-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ============================================
   6. RESPONSIVE BREAKPOINTS
   ============================================ */
@media (max-width: 1280px) {
  :root { --container-max: 1024px; }
}
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }
}
@media (max-width: 768px) {
  :root { --navbar-height: 64px; }
  .container { padding: 0 var(--space-4); }
  .section { padding: var(--space-16) 0; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }
  .section-title { font-size: var(--text-3xl); }
  .section-subtitle { font-size: var(--text-base); }
  .hide-mobile { display: none !important; }
}
@media (max-width: 480px) {
  h1 { font-size: var(--text-2xl); }
  .section { padding: var(--space-12) 0; }
}