/* ===== PANTHARADOCS SHARED THEME SYSTEM ===== */

/* Import Premium Fonts */
@import url('https://fonts.googleapis.com/css2?family=Crimson+Text:wght@400;600;700&family=JetBrains+Mono:wght@400;500;600&family=Noto+Serif+Devanagari:wght@400;600;700&display=swap');

/* ===== ROOT VARIABLES - LIGHT THEME (DEFAULT) ===== */
:root {
  /* Colors - Light Theme */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-text-primary: #1a1f2e;
  --color-text-secondary: #64748b;
  --color-text-tertiary: #94a3b8;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: #dbeafe;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-success: #16a34a;
  --color-warning: #ca8a04;
  --color-error: #dc2626;

  /* Gradients */
  --gradient-accent: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  --gradient-subtle: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 250, 252, 0.95) 100%);

  /* Shadows - Light Theme */
  --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);

  /* Backdrop - Glassmorphism */
  --backdrop-blur: blur(10px);

  /* Typography */
  --font-serif: 'Crimson Text', serif;
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-devanagari: 'Noto Serif Devanagari', serif;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  /* Line Heights */
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

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

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

  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-base: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;

  /* Z-Index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1070;
}

/* ===== ROOT VARIABLES - DARK THEME ===== */
:root[data-theme="dark"] {
  /* Colors - Dark Theme */
  --color-bg-primary: #0f1419;
  --color-bg-secondary: #1a202c;
  --color-bg-tertiary: #2d3748;
  --color-text-primary: #e0e6ed;
  --color-text-secondary: #b0b9c3;
  --color-text-tertiary: #8a95a1;
  --color-accent: #60a5fa;
  --color-accent-hover: #3b82f6;
  --color-accent-light: #1e3a8a;
  --color-border: #2d3748;
  --color-border-light: #1a202c;
  --color-success: #4ade80;
  --color-warning: #facc15;
  --color-error: #f87171;

  /* Gradients */
  --gradient-accent: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
  --gradient-subtle: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
  --gradient-card: linear-gradient(135deg, rgba(15, 20, 25, 0.95) 0%, rgba(26, 32, 44, 0.95) 100%);

  /* Shadows - Dark Theme */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* ===== GLOBAL STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
}

h1 {
  font-size: var(--text-5xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-4xl);
  letter-spacing: -0.01em;
}

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 {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* ===== HINDI TYPOGRAPHY ===== */
.lang-hi h1, .lang-hi h2, .lang-hi h3,
.lang-hi h4, .lang-hi h5, .lang-hi h6 {
  font-family: var(--font-devanagari);
  font-weight: 600;
}

.lang-hi body {
  font-family: var(--font-devanagari);
}

/* ===== HEADER & NAVIGATION ===== */
header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.navbar {
  padding: var(--spacing-md) 0;
  background-color: var(--color-bg-primary) !important;
}

.navbar-brand {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-accent) !important;
  transition: color var(--transition-fast);
}

.navbar-brand:hover {
  color: var(--color-accent-hover) !important;
}

.nav-link {
  font-family: var(--font-mono);
  color: var(--color-text-secondary) !important;
  transition: color var(--transition-fast);
  position: relative;
  padding: var(--spacing-sm) 0 !important;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent) !important;
}

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

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

/* ===== CONTROL BUTTONS ===== */
.theme-toggle,
.lang-toggle {
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  font-size: var(--text-lg);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.theme-toggle:hover,
.lang-toggle:hover {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ===== BUTTONS ===== */
.btn {
  font-family: var(--font-mono);
  font-weight: 600;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #ffffff;
  border: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background: var(--gradient-accent);
}

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

.btn-secondary:hover {
  background-color: var(--color-bg-tertiary);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ===== CARDS & CONTAINERS ===== */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  backdrop-filter: var(--backdrop-blur);
}

.card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-with-icon {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--spacing-md);
}

/* ===== BENTO GRID ===== */
.bento-grid {
  display: grid;
  gap: var(--spacing-xl);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  margin: var(--spacing-3xl) 0;
}

.bento-grid.large {
  grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 768px) {
  .bento-grid.large {
    grid-template-columns: 1fr;
  }
}

.bento-item {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.bento-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-xl);
  transform: translateY(-6px);
}

.bento-item.span-2 {
  grid-column: span 2;
}

.bento-item.span-2-rows {
  grid-row: span 2;
}

@media (max-width: 768px) {
  .bento-item.span-2,
  .bento-item.span-2-rows {
    grid-column: span 1;
    grid-row: span 1;
  }
}

/* ===== HERO SECTIONS ===== */
.hero {
  padding: var(--spacing-3xl) var(--spacing-md);
  background: var(--gradient-subtle);
  border-radius: var(--radius-2xl);
  margin: var(--spacing-3xl) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--color-accent-light), transparent);
  opacity: 0.1;
  border-radius: 50%;
}

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

/* ===== FOOTER ===== */
footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-3xl) var(--spacing-md) var(--spacing-lg);
  margin-top: var(--spacing-3xl);
}

footer h6 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-md);
}

footer p {
  margin-bottom: var(--spacing-sm);
  font-size: var(--text-sm);
}

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

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

/* ===== FORMS ===== */
.form-control {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  transition: all var(--transition-base);
}

.form-control:focus {
  background-color: var(--color-bg-primary);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
  color: var(--color-text-primary);
}

.form-label {
  color: var(--color-text-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

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

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

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

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

.slide-in-right {
  animation: slideInRight 0.6s ease-out;
}

/* Staggered animations */
.stagger > * {
  animation-delay: var(--animation-delay, 0s);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }
  h3 { font-size: var(--text-xl); }

  .bento-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  body {
    font-size: var(--text-sm);
  }

  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
  }
}

/* ===== UTILITY CLASSES ===== */
.text-accent { color: var(--color-accent); }
.text-secondary { color: var(--color-text-secondary); }
.bg-subtle { background-color: var(--color-bg-secondary); }
.border-subtle { border-color: var(--color-border); }

.shadow-card {
  box-shadow: var(--shadow-md);
}

.shadow-hover:hover {
  box-shadow: var(--shadow-lg);
}

.rounded-card {
  border-radius: var(--radius-lg);
}

/* ===== CONTAINER ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
  background-color: var(--color-accent);
}