/* ==========================================================================
   arabTech Design System
   Premium Editorial Tech Media Theme
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS CUSTOM PROPERTIES — DESIGN TOKENS
   -------------------------------------------------------------------------- */

:root {
  /* --- Color Palette: Light Mode --- */
  --at-bg-primary: #fafafa;
  --at-bg-secondary: #ffffff;
  --at-bg-tertiary: #f3f4f6;
  --at-bg-elevated: #ffffff;
  --at-bg-inset: #f8f9fa;
  --at-bg-overlay: rgba(0, 0, 0, 0.5);
  --at-bg-hover: #e9ecef;

  --at-text-primary: #0f172a;
  --at-text-secondary: #475569;
  --at-text-tertiary: #94a3b8;
  --at-text-inverse: #ffffff;
  --at-text-link: #2563eb;

  --at-border-primary: #e2e8f0;
  --at-border-secondary: #f1f5f9;
  --at-border-strong: #cbd5e1;

  --at-accent-primary: #2563eb;
  --at-accent-primary-hover: #1d4ed8;
  --at-accent-primary-light: rgba(37, 99, 235, 0.08);
  --at-accent-primary-medium: rgba(37, 99, 235, 0.15);
  --at-accent-secondary: #7c3aed;
  --at-accent-success: #059669;
  --at-accent-warning: #d97706;
  --at-accent-danger: #dc2626;
  --at-accent-info: #0891b2;

  --at-gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --at-gradient-subtle: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(124, 58, 237, 0.05) 100%);
  --at-gradient-hero: linear-gradient(180deg, transparent 0%, var(--at-bg-primary) 100%);

  /* --- Category Colors --- */
  --at-cat-ai: #7c3aed;
  --at-cat-dev: #2563eb;
  --at-cat-web: #059669;
  --at-cat-tutorial: #d97706;
  --at-cat-news: #dc2626;
  --at-cat-guide: #0891b2;
  --at-cat-hardware: #e11d48;
  --at-cat-cyber: #059669;
  --at-cat-saas: #0891b2;
  --at-cat-mobile: #ea580c;
  --at-cat-gaming: #7c3aed;
  --at-cat-space: #4f46e5;

  /* --- Typography Scale --- */
  --at-font-primary: 'IBM Plex Sans Arabic', 'Noto Sans Arabic', -apple-system, BlinkMacSystemFont, sans-serif;
  --at-font-mono: 'IBM Plex Mono', 'Fira Code', 'Cascadia Code', monospace;

  --at-text-xs: 0.75rem;
  --at-text-sm: 0.875rem;
  --at-text-base: 1rem;
  --at-text-lg: 1.125rem;
  --at-text-xl: 1.25rem;
  --at-text-2xl: 1.5rem;
  --at-text-3xl: 1.875rem;
  --at-text-4xl: 2.25rem;
  --at-text-5xl: 3rem;
  --at-text-6xl: 3.75rem;
  --at-text-hero: clamp(2.5rem, 5vw, 4.5rem);

  --at-leading-tight: 1.2;
  --at-leading-snug: 1.35;
  --at-leading-normal: 1.7;
  --at-leading-relaxed: 1.8;

  --at-weight-regular: 400;
  --at-weight-medium: 500;
  --at-weight-semibold: 600;
  --at-weight-bold: 700;

  /* --- Spacing Scale (8px base) --- */
  --at-space-0: 0;
  --at-space-1: 0.25rem;
  --at-space-2: 0.5rem;
  --at-space-3: 0.75rem;
  --at-space-4: 1rem;
  --at-space-5: 1.25rem;
  --at-space-6: 1.5rem;
  --at-space-8: 2rem;
  --at-space-10: 2.5rem;
  --at-space-12: 3rem;
  --at-space-16: 4rem;
  --at-space-20: 5rem;
  --at-space-24: 6rem;
  --at-space-32: 8rem;

  /* --- Border Radius --- */
  --at-radius-sm: 4px;
  --at-radius-md: 8px;
  --at-radius-lg: 12px;
  --at-radius-xl: 16px;
  --at-radius-2xl: 24px;
  --at-radius-full: 9999px;

  /* --- Shadows --- */
  --at-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --at-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --at-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --at-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --at-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.06), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --at-shadow-glow: 0 0 20px rgba(37, 99, 235, 0.15);

  /* --- Layout --- */
  --at-container-sm: 640px;
  --at-container-md: 768px;
  --at-container-lg: 1024px;
  --at-container-xl: 1200px;
  --at-container-2xl: 1400px;

  --at-header-height: 72px;
  --at-sidebar-width: 280px;
  --at-toc-width: 240px;

  /* --- Transitions --- */
  --at-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --at-transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --at-transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --at-transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* --- Z-index --- */
  --at-z-dropdown: 100;
  --at-z-sticky: 200;
  --at-z-overlay: 300;
  --at-z-modal: 400;
  --at-z-toast: 500;
}

/* --------------------------------------------------------------------------
   2. DARK MODE
   -------------------------------------------------------------------------- */

[data-theme="dark"] {
  --at-bg-primary: #0c0f1a;
  --at-bg-secondary: #111827;
  --at-bg-tertiary: #1a2035;
  --at-bg-elevated: #161d2e;
  --at-bg-inset: #0a0d16;
  --at-bg-overlay: rgba(0, 0, 0, 0.7);
  --at-bg-hover: #1e293b;

  --at-text-primary: #f1f5f9;
  --at-text-secondary: #94a3b8;
  --at-text-tertiary: #64748b;
  --at-text-inverse: #0f172a;
  --at-text-link: #60a5fa;

  --at-border-primary: #1e293b;
  --at-border-secondary: #1a2035;
  --at-border-strong: #334155;

  --at-accent-primary: #60a5fa;
  --at-accent-primary-hover: #93bbfd;
  --at-accent-primary-light: rgba(96, 165, 250, 0.08);
  --at-accent-primary-medium: rgba(96, 165, 250, 0.15);
  --at-accent-secondary: #a78bfa;
  --at-accent-success: #34d399;
  --at-accent-warning: #fbbf24;
  --at-accent-danger: #f87171;
  --at-accent-info: #22d3ee;

  --at-gradient-primary: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);
  --at-gradient-subtle: linear-gradient(135deg, rgba(96, 165, 250, 0.06) 0%, rgba(167, 139, 250, 0.06) 100%);

  --at-cat-ai: #a78bfa;
  --at-cat-dev: #60a5fa;
  --at-cat-web: #34d399;
  --at-cat-tutorial: #fbbf24;
  --at-cat-news: #f87171;
  --at-cat-guide: #22d3ee;
  --at-cat-hardware: #fb7185;
  --at-cat-cyber: #34d399;
  --at-cat-saas: #22d3ee;
  --at-cat-mobile: #fb923c;
  --at-cat-gaming: #a78bfa;
  --at-cat-space: #818cf8;

  --at-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
  --at-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --at-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --at-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
  --at-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
  --at-shadow-glow: 0 0 30px rgba(96, 165, 250, 0.2);
}


/* ==========================================================================
   3. CSS RESET & BASE
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--at-header-height) + var(--at-space-8));
}

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

[data-theme="dark"] body {
  color-scheme: dark;
}

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

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  font-size: inherit;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}


/* ==========================================================================
   4. TYPOGRAPHY
   ========================================================================== */

.at-heading {
  font-weight: var(--at-weight-bold);
  line-height: var(--at-leading-tight);
  letter-spacing: -0.01em;
}

.at-h1 {
  font-size: var(--at-text-hero);
  font-weight: var(--at-weight-bold);
  line-height: 1.15;
}

.at-h2 {
  font-size: var(--at-text-4xl);
  font-weight: var(--at-weight-bold);
}

.at-h3 {
  font-size: var(--at-text-3xl);
  font-weight: var(--at-weight-semibold);
}

.at-h4 {
  font-size: var(--at-text-2xl);
  font-weight: var(--at-weight-semibold);
}

.at-h5 {
  font-size: var(--at-text-xl);
  font-weight: var(--at-weight-semibold);
}

.at-h6 {
  font-size: var(--at-text-lg);
  font-weight: var(--at-weight-medium);
}

.at-lead {
  font-size: var(--at-text-xl);
  line-height: var(--at-leading-relaxed);
  color: var(--at-text-secondary);
}

.at-caption {
  font-size: var(--at-text-sm);
  color: var(--at-text-tertiary);
}

.at-overline {
  font-size: var(--at-text-xs);
  font-weight: var(--at-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--at-text-tertiary);
}

.at-prose {
  font-size: var(--at-text-lg);
  line-height: var(--at-leading-relaxed);
  color: var(--at-text-secondary);
}

.at-prose > * + * {
  margin-top: 1.5em;
}

.at-prose h2,
.at-prose h3,
.at-prose h4 {
  color: var(--at-text-primary);
  margin-top: 2em;
  margin-bottom: 0.75em;
}

.at-prose h2 { font-size: var(--at-text-3xl); }
.at-prose h3 { font-size: var(--at-text-2xl); }
.at-prose h4 { font-size: var(--at-text-xl); }

.at-prose p {
  margin-bottom: 1.25em;
}

.at-prose a {
  color: var(--at-accent-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--at-accent-primary-medium);
  transition: text-decoration-color var(--at-transition-fast);
}

.at-prose a:hover {
  text-decoration-color: var(--at-accent-primary);
}

.at-prose strong {
  color: var(--at-text-primary);
  font-weight: var(--at-weight-semibold);
}

.at-prose img {
  border-radius: var(--at-radius-lg);
  margin: 2em 0;
}

.at-prose figure {
  margin: 2em 0;
}

.at-prose figcaption {
  font-size: var(--at-text-sm);
  color: var(--at-text-tertiary);
  text-align: center;
  margin-top: var(--at-space-3);
}

.at-prose blockquote {
  border-inline-start: 3px solid var(--at-accent-primary);
  padding: var(--at-space-4) var(--at-space-6);
  margin: 2em 0;
  background: var(--at-accent-primary-light);
  border-radius: 0 var(--at-radius-md) var(--at-radius-md) 0;
  font-style: italic;
  color: var(--at-text-secondary);
}

.at-prose ul,
.at-prose ol {
  padding-inline-start: 1.5em;
  margin: 1.25em 0;
}

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

.at-prose li {
  margin-bottom: 0.5em;
  padding-inline-start: 0.25em;
}

.at-prose hr {
  border: none;
  height: 1px;
  background: var(--at-border-primary);
  margin: 2.5em 0;
}

.at-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 2em 0;
  font-size: var(--at-text-sm);
}

.at-prose th,
.at-prose td {
  padding: var(--at-space-3) var(--at-space-4);
  text-align: start;
  border-bottom: 1px solid var(--at-border-primary);
}

.at-prose th {
  font-weight: var(--at-weight-semibold);
  color: var(--at-text-primary);
  background: var(--at-bg-tertiary);
}

.at-prose tr:hover td {
  background: var(--at-bg-tertiary);
}


/* ==========================================================================
   5. LAYOUT
   ========================================================================== */

.at-container {
  width: 100%;
  max-width: var(--at-container-xl);
  margin-inline: auto;
  padding-inline: var(--at-space-6);
}

.at-container--narrow {
  max-width: var(--at-container-md);
}

.at-container--wide {
  max-width: var(--at-container-2xl);
}

.at-section {
  padding-block: var(--at-space-16);
}

.at-section--sm {
  padding-block: var(--at-space-8);
}

.at-grid {
  display: grid;
  gap: var(--at-space-6);
}

.at-grid--2 { grid-template-columns: repeat(2, 1fr); }
.at-grid--3 { grid-template-columns: repeat(3, 1fr); }
.at-grid--4 { grid-template-columns: repeat(4, 1fr); }

.at-flex {
  display: flex;
  align-items: center;
}

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

.at-flex--gap-sm { gap: var(--at-space-2); }
.at-flex--gap-md { gap: var(--at-space-4); }
.at-flex--gap-lg { gap: var(--at-space-6); }


/* ==========================================================================
   6. COMPONENTS — BADGES
   ========================================================================== */

.at-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--at-space-1);
  padding: var(--at-space-1) var(--at-space-3);
  font-size: var(--at-text-xs);
  font-weight: var(--at-weight-semibold);
  border-radius: var(--at-radius-full);
  white-space: nowrap;
  line-height: 1.6;
}

.at-badge--ai {
  background: rgba(124, 58, 237, 0.1);
  color: var(--at-cat-ai);
}

.at-badge--dev {
  background: rgba(37, 99, 235, 0.1);
  color: var(--at-cat-dev);
}

.at-badge--web {
  background: rgba(5, 150, 105, 0.1);
  color: var(--at-cat-web);
}

.at-badge--tutorial {
  background: rgba(217, 119, 6, 0.1);
  color: var(--at-cat-tutorial);
}

.at-badge--news {
  background: rgba(220, 38, 38, 0.1);
  color: var(--at-cat-news);
}

.at-badge--guide {
  background: rgba(8, 145, 178, 0.1);
  color: var(--at-cat-guide);
}

.at-badge--primary {
  background: var(--at-accent-primary-light);
  color: var(--at-accent-primary);
}

[data-theme="dark"] .at-badge--ai,
[data-theme="dark"] .at-badge--dev,
[data-theme="dark"] .at-badge--web,
[data-theme="dark"] .at-badge--tutorial,
[data-theme="dark"] .at-badge--news,
[data-theme="dark"] .at-badge--guide {
  opacity: 0.9;
}


/* ==========================================================================
   7. COMPONENTS — BUTTONS
   ========================================================================== */

.at-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--at-space-2);
  padding: var(--at-space-3) var(--at-space-6);
  font-size: var(--at-text-sm);
  font-weight: var(--at-weight-medium);
  border-radius: var(--at-radius-md);
  transition: all var(--at-transition-fast);
  white-space: nowrap;
  line-height: 1;
}

.at-btn--primary {
  background: var(--at-accent-primary);
  color: var(--at-text-inverse);
}

.at-btn--primary:hover {
  background: var(--at-accent-primary-hover);
  color: var(--at-text-inverse);
  box-shadow: var(--at-shadow-glow);
}

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

.at-btn--outline:hover {
  border-color: var(--at-accent-primary);
  color: var(--at-accent-primary);
  background: var(--at-accent-primary-light);
}

.at-btn--ghost {
  color: var(--at-text-secondary);
  background: transparent;
}

.at-btn--ghost:hover {
  color: var(--at-text-primary);
  background: var(--at-bg-tertiary);
}

.at-btn--sm {
  padding: var(--at-space-2) var(--at-space-4);
  font-size: var(--at-text-xs);
}

.at-btn--lg {
  padding: var(--at-space-4) var(--at-space-8);
  font-size: var(--at-text-base);
}


/* ==========================================================================
   8. COMPONENTS — CARDS
   ========================================================================== */

.at-card {
  background: var(--at-bg-secondary);
  border: 1px solid var(--at-border-primary);
  border-radius: var(--at-radius-lg);
  overflow: hidden;
  transition: all var(--at-transition-base);
}

.at-card:hover {
  box-shadow: var(--at-shadow-lg);
  border-color: var(--at-border-strong);
  transform: translateY(-2px);
}

.at-card__image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.at-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--at-transition-slow);
}

.at-card:hover .at-card__image img {
  transform: scale(1.03);
}

.at-card__body {
  padding: var(--at-space-5);
}

.at-card__meta {
  display: flex;
  align-items: center;
  gap: var(--at-space-3);
  margin-bottom: var(--at-space-3);
}

.at-card__title {
  font-size: var(--at-text-lg);
  font-weight: var(--at-weight-semibold);
  line-height: var(--at-leading-snug);
  color: var(--at-text-primary);
  margin-bottom: var(--at-space-2);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.at-card__title a {
  color: inherit;
}

.at-card__title a:hover {
  color: var(--at-accent-primary);
}

.at-card__excerpt {
  font-size: var(--at-text-sm);
  color: var(--at-text-secondary);
  line-height: var(--at-leading-normal);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.at-card__footer {
  padding: var(--at-space-4) var(--at-space-5);
  border-top: 1px solid var(--at-border-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}


/* ==========================================================================
   9. COMPONENTS — CODE BLOCKS
   ========================================================================== */

.at-code {
  position: relative;
}

.at-code__block {
  background: var(--at-bg-inset);
  border: 1px solid var(--at-border-primary);
  border-radius: var(--at-radius-lg);
  overflow: hidden;
  margin: 2em 0;
}

.at-code__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--at-space-3) var(--at-space-4);
  background: var(--at-bg-tertiary);
  border-bottom: 1px solid var(--at-border-primary);
  font-size: var(--at-text-xs);
  color: var(--at-text-tertiary);
}

.at-code__lang {
  font-weight: var(--at-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.at-code__copy {
  display: inline-flex;
  align-items: center;
  gap: var(--at-space-1);
  padding: var(--at-space-1) var(--at-space-3);
  font-size: var(--at-text-xs);
  color: var(--at-text-tertiary);
  border-radius: var(--at-radius-sm);
  transition: all var(--at-transition-fast);
  cursor: pointer;
}

.at-code__copy:hover {
  color: var(--at-text-primary);
  background: var(--at-bg-secondary);
}

.at-code__copy.copied {
  color: var(--at-accent-success);
}

.at-code__body {
  padding: var(--at-space-4);
  overflow-x: auto;
  font-family: var(--at-font-mono);
  font-size: var(--at-text-sm);
  line-height: 1.7;
  tab-size: 4;
  direction: ltr;
  text-align: left;
}

.at-code__body code {
  font-family: inherit;
}

/* Inline code */
.at-prose code:not(.at-code__body code) {
  background: var(--at-accent-primary-light);
  color: var(--at-accent-primary);
  padding: 0.15em 0.4em;
  border-radius: var(--at-radius-sm);
  font-size: 0.875em;
  font-family: var(--at-font-mono);
  direction: ltr;
  unicode-bidi: isolate;
}

[data-theme="dark"] .at-code__block {
  background: #0d1117;
  border-color: #21262d;
}


/* ==========================================================================
   10. COMPONENTS — ALERTS
   ========================================================================== */

.at-alert {
  display: flex;
  gap: var(--at-space-4);
  padding: var(--at-space-4) var(--at-space-5);
  border-radius: var(--at-radius-md);
  margin: 1.5em 0;
  border-inline-start: 4px solid;
}

.at-alert__icon {
  flex-shrink: 0;
  font-size: var(--at-text-xl);
  line-height: 1.5;
}

.at-alert__content {
  flex: 1;
}

.at-alert__title {
  font-weight: var(--at-weight-semibold);
  font-size: var(--at-text-sm);
  margin-bottom: var(--at-space-1);
}

.at-alert__text {
  font-size: var(--at-text-sm);
  line-height: var(--at-leading-normal);
  opacity: 0.85;
}

.at-alert--info {
  background: rgba(8, 145, 178, 0.06);
  border-color: var(--at-accent-info);
  color: #0e7490;
}

.at-alert--warning {
  background: rgba(217, 119, 6, 0.06);
  border-color: var(--at-accent-warning);
  color: #b45309;
}

.at-alert--danger {
  background: rgba(220, 38, 38, 0.06);
  border-color: var(--at-accent-danger);
  color: #b91c1c;
}

.at-alert--success {
  background: rgba(5, 150, 105, 0.06);
  border-color: var(--at-accent-success);
  color: #047857;
}

[data-theme="dark"] .at-alert--info { color: var(--at-accent-info); }
[data-theme="dark"] .at-alert--warning { color: var(--at-accent-warning); }
[data-theme="dark"] .at-alert--danger { color: var(--at-accent-danger); }
[data-theme="dark"] .at-alert--success { color: var(--at-accent-success); }


/* ==========================================================================
   11. COMPONENTS — FORMS
   ========================================================================== */

.at-input {
  display: flex;
  align-items: center;
  gap: var(--at-space-3);
  padding: var(--at-space-3) var(--at-space-4);
  background: var(--at-bg-secondary);
  border: 1px solid var(--at-border-primary);
  border-radius: var(--at-radius-md);
  transition: border-color var(--at-transition-fast), box-shadow var(--at-transition-fast);
}

.at-input:focus-within {
  border-color: var(--at-accent-primary);
  box-shadow: 0 0 0 3px var(--at-accent-primary-light);
}

.at-input input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  color: var(--at-text-primary);
}

.at-input input::placeholder {
  color: var(--at-text-tertiary);
}

.at-input--lg {
  padding: var(--at-space-4) var(--at-space-5);
  border-radius: var(--at-radius-lg);
}

.at-input--lg input {
  font-size: var(--at-text-lg);
}


/* ==========================================================================
   12. READING PROGRESS BAR
   ========================================================================== */

.at-progress {
  position: fixed;
  top: 0;
  inset-inline-start: 0;
  width: 0;
  height: 3px;
  background: var(--at-gradient-primary);
  z-index: calc(var(--at-z-toast) + 1);
  transition: width 50ms linear;
  border-radius: 0 2px 2px 0;
}


/* ==========================================================================
   13. TABLE OF CONTENTS
   ========================================================================== */

.at-toc {
  position: sticky;
  top: calc(var(--at-header-height) + var(--at-space-8));
  max-height: calc(100vh - var(--at-header-height) - var(--at-space-16));
  overflow-y: auto;
  padding: var(--at-space-5);
  background: var(--at-bg-secondary);
  border: 1px solid var(--at-border-primary);
  border-radius: var(--at-radius-lg);
  font-size: var(--at-text-sm);
}

.at-toc__title {
  font-size: var(--at-text-xs);
  font-weight: var(--at-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--at-text-tertiary);
  margin-bottom: var(--at-space-4);
}

.at-toc__list {
  display: flex;
  flex-direction: column;
  gap: var(--at-space-1);
}

.at-toc__link {
  display: block;
  padding: var(--at-space-2) var(--at-space-3);
  color: var(--at-text-tertiary);
  border-radius: var(--at-radius-sm);
  transition: all var(--at-transition-fast);
  border-inline-start: 2px solid transparent;
  line-height: 1.5;
}

.at-toc__link:hover {
  color: var(--at-text-primary);
  background: var(--at-bg-tertiary);
}

.at-toc__link.active {
  color: var(--at-accent-primary);
  border-inline-start-color: var(--at-accent-primary);
  background: var(--at-accent-primary-light);
  font-weight: var(--at-weight-medium);
}

.at-toc__link[data-level="3"] {
  padding-inline-start: var(--at-space-8);
  font-size: var(--at-text-xs);
}


/* ==========================================================================
   14. RESPONSIVE
   ========================================================================== */

@media (max-width: 1024px) {
  .at-grid--3 { grid-template-columns: repeat(2, 1fr); }
  .at-grid--4 { grid-template-columns: repeat(2, 1fr); }

  .at-toc {
    position: static;
    max-height: none;
    margin-bottom: var(--at-space-8);
  }
}

@media (max-width: 768px) {
  :root {
    --at-header-height: 64px;
  }

  .at-container {
    padding-inline: var(--at-space-4);
  }

  .at-section {
    padding-block: var(--at-space-10);
  }

  .at-grid--2,
  .at-grid--3,
  .at-grid--4 {
    grid-template-columns: 1fr;
  }

  .at-h1 { font-size: var(--at-text-4xl); }
  .at-h2 { font-size: var(--at-text-3xl); }
  .at-h3 { font-size: var(--at-text-2xl); }

  .at-prose {
    font-size: var(--at-text-base);
  }
}

@media (max-width: 480px) {
  .at-h1 { font-size: var(--at-text-3xl); }

  .at-btn--lg {
    padding: var(--at-space-3) var(--at-space-6);
    font-size: var(--at-text-sm);
  }
}


/* ==========================================================================
   15. UTILITY CLASSES
   ========================================================================== */

.at-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.at-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.at-line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

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

.at-divider {
  height: 1px;
  background: var(--at-border-primary);
  border: none;
}

.at-divider--dashed {
  background: none;
  border-top: 1px dashed var(--at-border-primary);
}


/* ==========================================================================
   16. HIGH-TECH COMPONENTS
   ========================================================================== */

/* --- Tech Spec Card --- */
.at-tech-spec {
  background: var(--at-bg-secondary);
  border: 1px solid var(--at-border-primary);
  border-radius: var(--at-radius-lg);
  padding: var(--at-space-5);
  display: flex;
  flex-direction: column;
  gap: var(--at-space-3);
}

.at-tech-spec__label {
  font-size: var(--at-text-xs);
  font-weight: var(--at-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--at-text-tertiary);
}

.at-tech-spec__value {
  font-size: var(--at-text-2xl);
  font-weight: var(--at-weight-bold);
  color: var(--at-text-primary);
  font-family: var(--at-font-mono);
  direction: ltr;
  unicode-bidi: isolate;
}

.at-tech-spec__bar {
  height: 4px;
  background: var(--at-bg-tertiary);
  border-radius: var(--at-radius-full);
  overflow: hidden;
}

.at-tech-spec__bar-fill {
  height: 100%;
  background: var(--at-gradient-primary);
  border-radius: var(--at-radius-full);
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Tech Status Indicator --- */
.at-status {
  display: inline-flex;
  align-items: center;
  gap: var(--at-space-2);
  font-size: var(--at-text-xs);
  font-weight: var(--at-weight-medium);
}

.at-status__dot {
  width: 8px;
  height: 8px;
  border-radius: var(--at-radius-full);
  background: var(--at-accent-success);
  animation: at-status-pulse 2s infinite;
}

@keyframes at-status-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.4); }
  50% { opacity: 0.8; box-shadow: 0 0 0 6px rgba(5, 150, 105, 0); }
}

.at-status--live .at-status__dot { background: var(--at-accent-danger); }
.at-status--beta .at-status__dot { background: var(--at-accent-warning); }
.at-status--new .at-status__dot { background: var(--at-accent-info); }

/* --- Version Tag --- */
.at-version {
  display: inline-flex;
  align-items: center;
  padding: var(--at-space-1) var(--at-space-3);
  font-size: 10px;
  font-weight: var(--at-weight-bold);
  font-family: var(--at-font-mono);
  letter-spacing: 0.05em;
  border-radius: var(--at-radius-sm);
  background: var(--at-bg-tertiary);
  color: var(--at-text-secondary);
  direction: ltr;
  unicode-bidi: isolate;
}

/* --- Chip / Tag Group --- */
.at-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--at-space-2);
}

.at-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--at-space-1);
  padding: var(--at-space-1) var(--at-space-3);
  font-size: var(--at-text-xs);
  font-weight: var(--at-weight-medium);
  background: var(--at-bg-tertiary);
  color: var(--at-text-secondary);
  border-radius: var(--at-radius-full);
  border: 1px solid var(--at-border-primary);
  transition: all var(--at-transition-fast);
  text-decoration: none;
}

.at-chip:hover {
  color: var(--at-accent-primary);
  border-color: var(--at-accent-primary);
  background: var(--at-accent-primary-light);
}

.at-chip__icon {
  font-size: 12px;
}

/* --- Stat Block --- */
.at-stat {
  text-align: center;
  padding: var(--at-space-6);
}

.at-stat__number {
  font-size: var(--at-text-4xl);
  font-weight: var(--at-weight-bold);
  font-family: var(--at-font-mono);
  background: var(--at-gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  direction: ltr;
  unicode-bidi: isolate;
}

.at-stat__label {
  font-size: var(--at-text-sm);
  color: var(--at-text-tertiary);
  margin-top: var(--at-space-2);
}

/* --- Terminal Block --- */
.at-terminal {
  background: #0d1117;
  border-radius: var(--at-radius-lg);
  overflow: hidden;
  margin: 2em 0;
  border: 1px solid #21262d;
}

.at-terminal__header {
  display: flex;
  align-items: center;
  gap: var(--at-space-2);
  padding: var(--at-space-3) var(--at-space-4);
  background: #161b22;
  border-bottom: 1px solid #21262d;
}

.at-terminal__dots {
  display: flex;
  gap: 6px;
}

.at-terminal__dot {
  width: 12px;
  height: 12px;
  border-radius: var(--at-radius-full);
}

.at-terminal__dot--red { background: #ff5f57; }
.at-terminal__dot--yellow { background: #febc2e; }
.at-terminal__dot--green { background: #28c840; }

.at-terminal__title {
  font-size: var(--at-text-xs);
  color: #8b949e;
  font-family: var(--at-font-mono);
  margin-inline-start: var(--at-space-2);
}

.at-terminal__body {
  padding: var(--at-space-4);
  font-family: var(--at-font-mono);
  font-size: var(--at-text-sm);
  line-height: 1.7;
  color: #c9d1d9;
  direction: ltr;
  text-align: left;
  overflow-x: auto;
}

.at-terminal__prompt {
  color: #7ee787;
}

.at-terminal__comment {
  color: #8b949e;
}

.at-terminal__output {
  color: #c9d1d9;
}

/* --- Benchmark Bar --- */
.at-benchmark {
  display: flex;
  align-items: center;
  gap: var(--at-space-4);
  padding: var(--at-space-3) 0;
}

.at-benchmark__label {
  min-width: 100px;
  font-size: var(--at-text-sm);
  font-weight: var(--at-weight-medium);
  color: var(--at-text-primary);
}

.at-benchmark__bar {
  flex: 1;
  height: 8px;
  background: var(--at-bg-tertiary);
  border-radius: var(--at-radius-full);
  overflow: hidden;
}

.at-benchmark__fill {
  height: 100%;
  border-radius: var(--at-radius-full);
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.at-benchmark__value {
  min-width: 48px;
  font-size: var(--at-text-sm);
  font-weight: var(--at-weight-bold);
  font-family: var(--at-font-mono);
  color: var(--at-text-primary);
  text-align: end;
  direction: ltr;
  unicode-bidi: isolate;
}