/* ═══════════════════════════════════════════════════════════════════════════
   MI STUDIO — Premium Design System
   Palette: Violet (#7c3aed) / Orange (#f97316)
   Fonts: Poppins (headings) / Source Sans Pro (body)
═══════════════════════════════════════════════════════════════════════════ */

/* === TAILWIND CDN IMPORT === */
@import url('https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css');

/* === CUSTOM PROPERTIES === */
:root {
  --color-primary: #7c3aed;
  --color-primary-dark: #6d28d9;
  --color-primary-light: #a78bfa;
  --color-secondary: #6d28d9;
  --color-accent: #f97316;
  --color-accent-dark: #ea580c;
  --color-accent-light: #fb923c;

  --color-slate-50: #f8fafc;
  --color-slate-100: #f1f5f9;
  --color-slate-200: #e2e8f0;
  --color-slate-300: #cbd5e1;
  --color-slate-400: #94a3b8;
  --color-slate-500: #64748b;
  --color-slate-600: #475569;
  --color-slate-700: #334155;
  --color-slate-800: #1e293b;
  --color-slate-900: #0f172a;
  --color-slate-950: #020617;

  --font-heading: 'Poppins', system-ui, sans-serif;
  --font-body: 'Source Sans Pro', system-ui, sans-serif;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
}

/* === BASE STYLES === */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-body);
  color: var(--color-slate-800);
  background-color: white;
  line-height: 1.6;
}

.font-heading {
  font-family: var(--font-heading);
}

/* === HEADER STYLES === */
.header-main {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
}

.header-main.header-scrolled {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: var(--color-slate-200);
  box-shadow: var(--shadow-sm);
}

.header-logo-text {
  color: var(--color-slate-900);
}

.header-logo-tagline {
  color: var(--color-slate-500);
}

.nav-link {
  color: var(--color-slate-600);
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-slate-50);
}

.nav-link-active {
  color: var(--color-primary);
  background-color: rgba(124, 58, 237, 0.1);
}

.mobile-menu-btn {
  color: var(--color-slate-600);
}

.h-18 {
  height: 4.5rem;
}

.h-20 {
  height: 5rem;
}

/* === BUTTONS === */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  color: white;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-xl);
  box-shadow: 0 4px 14px 0 rgba(249, 115, 22, 0.39);
  transition: all 0.3s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(249, 115, 22, 0.5);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-xl);
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.3);
}

/* === TEXT GRADIENT === */
.text-gradient {
  background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-accent) 50%, var(--color-primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* === GRID PATTERN === */
.bg-grid-pattern {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 50px 50px;
}

/* === CATEGORY CARDS === */
.category-card {
  display: flex;
  flex-direction: column;
  padding: 1.75rem;
  background: white;
  border: 1px solid var(--color-slate-100);
  border-radius: var(--radius-2xl);
  transition: all 0.3s ease;
}

.category-card:hover {
  border-color: var(--color-slate-200);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.category-icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  transition: all 0.3s ease;
}

/* === ARTICLE CARDS === */
.article-card {
  background: white;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-slate-100);
  transition: all 0.3s ease;
}

.article-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
  border-color: transparent;
}

.article-card-image {
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.article-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.article-card:hover .article-card-image img {
  transform: scale(1.05);
}

.article-card-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-slate-100) 0%, var(--color-slate-200) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.article-card-content {
  padding: 1.5rem;
}

/* === VIOLET COLOR UTILITIES === */
.bg-violet-50 { background-color: #f5f3ff; }
.bg-violet-100 { background-color: #ede9fe; }
.bg-violet-200 { background-color: #ddd6fe; }
.bg-violet-600 { background-color: var(--color-primary); }
.bg-violet-700 { background-color: var(--color-primary-dark); }
.bg-violet-950 { background-color: #2e1065; }

.text-violet-600 { color: var(--color-primary); }
.text-violet-700 { color: var(--color-primary-dark); }
.text-violet-800 { color: #5b21b6; }
.text-violet-100 { color: #ede9fe; }
.text-violet-200 { color: #ddd6fe; }

.hover\:bg-violet-50:hover { background-color: #f5f3ff; }
.hover\:bg-violet-200:hover { background-color: #ddd6fe; }
.hover\:bg-violet-600:hover { background-color: var(--color-primary); }
.hover\:bg-violet-700:hover { background-color: var(--color-primary-dark); }
.hover\:text-violet-600:hover { color: var(--color-primary); }
.hover\:text-violet-800:hover { color: #5b21b6; }
.hover\:text-violet-400:hover { color: var(--color-primary-light); }
.hover\:border-violet-200:hover { border-color: #ddd6fe; }

.from-violet-600 { --tw-gradient-from: var(--color-primary); }
.from-violet-700 { --tw-gradient-from: var(--color-primary-dark); }
.from-violet-950 { --tw-gradient-from: #2e1065; }
.from-violet-100 { --tw-gradient-from: #ede9fe; }
.via-violet-600 { --tw-gradient-stops: var(--tw-gradient-from), var(--color-primary), var(--tw-gradient-to, rgba(124, 58, 237, 0)); }
.via-violet-950 { --tw-gradient-stops: var(--tw-gradient-from), #2e1065, var(--tw-gradient-to, rgba(46, 16, 101, 0)); }
.to-purple-700 { --tw-gradient-to: #7e22ce; }
.to-purple-100 { --tw-gradient-to: #f3e8ff; }

/* === ORANGE COLOR UTILITIES === */
.bg-orange-100 { background-color: #ffedd5; }
.bg-orange-200 { background-color: #fed7aa; }
.bg-orange-500 { background-color: var(--color-accent); }

.text-orange-400 { color: var(--color-accent-light); }
.text-orange-500 { color: var(--color-accent); }
.text-orange-600 { color: var(--color-accent); }
.text-orange-700 { color: var(--color-accent-dark); }

.hover\:bg-orange-200:hover { background-color: #fed7aa; }
.hover\:bg-orange-500:hover { background-color: var(--color-accent); }
.hover\:bg-orange-600:hover { background-color: var(--color-accent-dark); }
.hover\:text-orange-600:hover { color: var(--color-accent); }
.hover\:text-orange-700:hover { color: var(--color-accent-dark); }

.from-orange-100 { --tw-gradient-from: #ffedd5; }
.from-orange-500 { --tw-gradient-from: var(--color-accent); }
.to-orange-500 { --tw-gradient-to: var(--color-accent); }
.to-orange-100 { --tw-gradient-to: #ffedd5; }

/* === EMERALD COLOR UTILITIES === */
.bg-emerald-100 { background-color: #d1fae5; }
.bg-emerald-600 { background-color: #059669; }

.text-emerald-600 { color: #059669; }
.text-emerald-700 { color: #047857; }

.hover\:bg-emerald-600:hover { background-color: #059669; }
.hover\:text-emerald-600:hover { color: #059669; }
.hover\:text-emerald-700:hover { color: #047857; }

/* === SKY COLOR UTILITIES === */
.bg-sky-100 { background-color: #e0f2fe; }
.bg-sky-600 { background-color: #0284c7; }

.text-sky-600 { color: #0284c7; }
.text-sky-700 { color: #0369a1; }

.hover\:bg-sky-600:hover { background-color: #0284c7; }
.hover\:text-sky-600:hover { color: #0284c7; }
.hover\:text-sky-700:hover { color: #0369a1; }

/* === SLATE EXTENSIONS === */
.bg-slate-50 { background-color: var(--color-slate-50); }
.bg-slate-100 { background-color: var(--color-slate-100); }
.bg-slate-800 { background-color: var(--color-slate-800); }
.bg-slate-900 { background-color: var(--color-slate-900); }

.text-slate-300 { color: var(--color-slate-300); }
.text-slate-400 { color: var(--color-slate-400); }
.text-slate-500 { color: var(--color-slate-500); }
.text-slate-600 { color: var(--color-slate-600); }
.text-slate-700 { color: var(--color-slate-700); }
.text-slate-900 { color: var(--color-slate-900); }

.border-slate-100 { border-color: var(--color-slate-100); }
.border-slate-200 { border-color: var(--color-slate-200); }
.border-slate-800 { border-color: var(--color-slate-800); }

.hover\:text-white:hover { color: white; }
.hover\:bg-slate-50:hover { background-color: var(--color-slate-50); }

/* === PROSE STYLES === */
.prose {
  max-width: 65ch;
  color: var(--color-slate-800);
  line-height: 1.8;
}

.prose p {
  margin-top: 1.5em;
  margin-bottom: 1.5em;
}

.prose h2 {
  font-family: var(--font-heading);
  color: var(--color-slate-900);
  font-weight: 700;
  font-size: 1.75em;
  margin-top: 2.5em;
  margin-bottom: 1em;
  line-height: 1.3;
}

.prose h3 {
  font-family: var(--font-heading);
  color: var(--color-slate-900);
  font-weight: 600;
  font-size: 1.35em;
  margin-top: 2em;
  margin-bottom: 0.75em;
  line-height: 1.4;
}

.prose a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.prose a:hover {
  color: var(--color-primary-dark);
}

.prose strong {
  color: var(--color-slate-900);
  font-weight: 600;
}

.prose ul, .prose ol {
  margin-top: 1.5em;
  margin-bottom: 1.5em;
  padding-left: 1.75em;
}

.prose ul { list-style-type: disc; }
.prose ol { list-style-type: decimal; }

.prose li {
  margin-top: 0.5em;
  margin-bottom: 0.5em;
  padding-left: 0.25em;
}

.prose blockquote {
  font-style: italic;
  border-left: 4px solid var(--color-primary);
  padding-left: 1.5em;
  margin: 2em 0;
  color: var(--color-slate-600);
  background: var(--color-slate-50);
  padding: 1.5em;
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.prose code {
  background-color: var(--color-slate-100);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  color: var(--color-slate-800);
}

.prose pre {
  background-color: var(--color-slate-900);
  color: var(--color-slate-100);
  overflow-x: auto;
  padding: 1.25em;
  border-radius: var(--radius-xl);
  margin: 2em 0;
}

.prose pre code {
  background-color: transparent;
  padding: 0;
  border-radius: 0;
  font-size: 0.875em;
  color: inherit;
}

.prose img {
  margin: 2.5em 0;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.prose table {
  width: 100%;
  table-layout: auto;
  text-align: left;
  margin: 2.5em 0;
  font-size: 0.9em;
  line-height: 1.6;
  border-collapse: collapse;
}

.prose thead {
  background: var(--color-slate-50);
}

.prose thead th {
  color: var(--color-slate-900);
  font-weight: 600;
  padding: 1em;
  border-bottom: 2px solid var(--color-slate-200);
}

.prose tbody tr {
  border-bottom: 1px solid var(--color-slate-100);
}

.prose tbody td {
  padding: 1em;
}

.prose tbody tr:hover {
  background: var(--color-slate-50);
}

/* === LINE CLAMP === */
.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* === ASPECT RATIOS === */
.aspect-video { aspect-ratio: 16 / 9; }
.aspect-\[4\/3\] { aspect-ratio: 4 / 3; }
.aspect-\[16\/10\] { aspect-ratio: 16 / 10; }

/* === ANIMATIONS === */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.animate-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* === TRANSITIONS === */
.transition {
  transition-property: color, background-color, border-color, fill, stroke, opacity, box-shadow, transform;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 150ms;
}

.transition-all {
  transition-property: all;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 150ms;
}

.transition-colors {
  transition-property: color, background-color, border-color;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 150ms;
}

.transition-transform {
  transition-property: transform;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 150ms;
}

.transition-opacity {
  transition-property: opacity;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 150ms;
}

.duration-200 { transition-duration: 200ms; }
.duration-300 { transition-duration: 300ms; }
.duration-500 { transition-duration: 500ms; }

/* === SHADOWS === */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }
.shadow-2xl { box-shadow: var(--shadow-2xl); }

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

/* === BLUR EFFECTS === */
.blur { filter: blur(8px); }
.blur-sm { filter: blur(4px); }
.blur-xl { filter: blur(24px); }
.blur-3xl { filter: blur(64px); }

.backdrop-blur { backdrop-filter: blur(8px); }
.backdrop-blur-sm { backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
.backdrop-blur-xl { backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px); }

/* === SELECTION === */
::selection {
  background-color: var(--color-primary);
  color: white;
}

/* === FOCUS STATES === */
:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* === RESPONSIVE UTILITIES === */
@media (max-width: 640px) {
  .prose {
    font-size: 1rem;
  }

  .prose h2 {
    font-size: 1.5em;
  }

  .prose h3 {
    font-size: 1.25em;
  }

  .btn-primary,
  .btn-secondary {
    padding: 0.875rem 1.5rem;
    font-size: 0.9375rem;
  }
}

/* === TABLE OF CONTENTS === */
.toc-nav nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.toc-nav nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.toc-nav nav ul ul {
  margin-left: 1rem;
  margin-top: 0.25rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--color-slate-200);
}

.toc-nav nav li {
  line-height: 1.4;
}

.toc-nav nav a {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--color-slate-600);
  border-radius: 0.5rem;
  transition: all 0.2s ease;
  text-decoration: none;
  font-weight: 500;
}

.toc-nav nav a:hover {
  color: var(--color-primary);
  background: rgba(124, 58, 237, 0.1);
  transform: translateX(4px);
}

.toc-nav nav ul ul a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-slate-500);
}

.toc-nav nav ul ul a:hover {
  color: var(--color-primary);
}

/* === ARTICLE SINGLE STYLES === */
.article-hero {
  overflow: hidden;
}

.article-single .prose table {
  border-collapse: separate;
  border-spacing: 0;
  width: 100%;
  overflow: hidden;
  border-radius: 0.75rem;
  border: 1px solid var(--color-slate-200);
}

.article-single .prose th,
.article-single .prose td {
  text-align: left;
}

.article-single .prose tbody tr:hover {
  background-color: var(--color-slate-50);
}

.article-single .prose blockquote {
  position: relative;
}

.article-single .prose blockquote::before {
  content: '"';
  position: absolute;
  top: -0.5rem;
  left: 1rem;
  font-size: 4rem;
  font-family: Georgia, serif;
  color: var(--color-primary-light);
  opacity: 0.5;
  line-height: 1;
}

/* Progress reading indicator (optional enhancement) */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  z-index: 100;
  transition: width 0.1s ease;
}

/* === PRINT STYLES === */
@media print {
  .header-main,
  footer,
  .btn-primary,
  .btn-secondary,
  .toc-nav,
  aside {
    display: none;
  }

  .prose {
    max-width: 100%;
  }

  .article-hero {
    background: white !important;
    color: black !important;
    padding-top: 2rem !important;
  }

  .article-hero h1 {
    color: black !important;
  }
}