/* ============================================
   Design System — Nusoos 2026
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Brand */
  --brand-50: #f0fdf4;
  --brand-100: #dcfce7;
  --brand-200: #bbf7d0;
  --brand-300: #86efac;
  --brand-400: #4ade80;
  --brand-500: #22c55e;
  --brand-600: #16a34a;
  --brand-700: #15803d;
  --brand-800: #166534;
  --brand-900: #14532d;

  /* Surfaces */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --surface: #ffffff;
  --surface-hover: #f8fafc;
  --surface-elevated: #ffffff;

  /* Text */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;
  --text-inverse: #f8fafc;

  /* Borders */
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-focus: var(--brand-500);

  /* Semantic */
  --success: #059669;
  --warning: #d97706;
  --danger: #dc2626;
  --info: #0284c7;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 40px -12px rgba(0,0,0,0.15);
  --shadow-glow: 0 0 20px rgba(34,197,94,0.15);

  /* Glass */
  --glass-bg: rgba(255,255,255,0.7);
  --glass-border: rgba(255,255,255,0.3);
  --glass-blur: 12px;

  /* Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-2xl: 1.5rem;
  --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);

  /* Navbar height */
  --nav-height: 4rem;
}

/* --- Dark Mode --- */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --surface: #1e293b;
  --surface-hover: #334155;
  --surface-elevated: #1e293b;

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

  --border: #334155;
  --border-hover: #475569;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.5);
  --shadow-xl: 0 20px 40px -12px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 20px rgba(34,197,94,0.25);

  --glass-bg: rgba(15,23,42,0.7);
  --glass-border: rgba(255,255,255,0.08);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --surface: #1e293b;
    --surface-hover: #334155;
    --surface-elevated: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --text-inverse: #0f172a;
    --border: #334155;
    --border-hover: #475569;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.5);
    --shadow-xl: 0 20px 40px -12px rgba(0,0,0,0.6);
    --shadow-glow: 0 0 20px rgba(34,197,94,0.25);
    --glass-bg: rgba(15,23,42,0.7);
    --glass-border: rgba(255,255,255,0.08);
  }
}

/* --- Base Styles --- */
body {
  font-family: 'IBM Plex Sans Arabic', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  transition: background-color var(--transition-base), color var(--transition-base);
}

html {
  scroll-behavior: smooth;
}

/* --- Glassmorphism --- */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
}

.glass-subtle {
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
}

@supports not (backdrop-filter: blur(1px)) {
  .glass, .glass-subtle {
    background: var(--surface);
  }
}

/* --- Surfaces --- */
.surface {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.surface:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
}

.surface-elevated {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

/* --- Buttons --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.5rem;
  background: var(--brand-600);
  color: white;
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
  font-size: 0.875rem;
}

.btn-primary:hover {
  background: var(--brand-700);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:focus-visible {
  outline: 2px solid var(--brand-500);
  outline-offset: 2px;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.5rem;
  background: transparent;
  color: var(--brand-600);
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--brand-600);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
  font-size: 0.875rem;
}

.btn-secondary:hover {
  background: var(--brand-50);
}

[data-theme="dark"] .btn-secondary:hover {
  background: rgba(34,197,94,0.1);
}

.btn-secondary:focus-visible {
  outline: 2px solid var(--brand-500);
  outline-offset: 2px;
}

/* --- Cards --- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  transition: all var(--transition-base);
}

.card-glass:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* --- Bento Grid --- */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: minmax(180px, auto);
  gap: 1rem;
}

.bento-full { grid-column: span 4; }
.bento-half { grid-column: span 2; }
.bento-third { grid-column: span 1; }
.bento-tall { grid-row: span 2; }

@media (max-width: 768px) {
  .bento-grid { grid-template-columns: repeat(2, 1fr); }
  .bento-half, .bento-full { grid-column: span 2; }
  .bento-third { grid-column: span 1; }
}

@media (max-width: 480px) {
  .bento-grid { grid-template-columns: 1fr; }
  .bento-half, .bento-full, .bento-third { grid-column: span 1; }
}

/* --- Dark Mode Toggle --- */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-secondary);
}

.theme-toggle:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon { display: none; }

[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

:root:not([data-theme="dark"]) .theme-toggle .icon-moon { display: block; }
:root:not([data-theme="dark"]) .theme-toggle .icon-sun { display: none; }

/* --- Scroll Animations --- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-fade-up { --animation-delay: 0ms; }
.animate-fade-up-1 { --animation-delay: 100ms; }
.animate-fade-up-2 { --animation-delay: 200ms; }
.animate-fade-up-3 { --animation-delay: 300ms; }

/* --- Focus Styles (Accessibility) --- */
*:focus-visible {
  outline: 2px solid var(--brand-500);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--brand-500);
  outline-offset: 2px;
}

/* --- RTL Logical Properties --- */
[dir="rtl"] .number-ltr {
  unicode-bidi: embed;
  direction: ltr;
  display: inline-block;
}

[dir="rtl"] pre,
[dir="rtl"] code {
  direction: ltr;
  text-align: left;
  unicode-bidi: embed;
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .animate-on-scroll {
    opacity: 1;
    transform: none;
  }
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* --- Selection --- */
::selection {
  background: var(--brand-200);
  color: var(--brand-900);
}

[data-theme="dark"] ::selection {
  background: var(--brand-800);
  color: var(--brand-100);
}

/* --- Cursor Blink (Chat) --- */
@keyframes blink-cursor {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.cursor-blink {
  animation: blink-cursor 1s infinite;
  color: var(--brand-500);
}

/* --- Gradient Backgrounds --- */
.bg-gradient-hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 40%, #14532d 100%);
}

.bg-gradient-brand {
  background: linear-gradient(135deg, var(--brand-600), var(--brand-500));
}

.bg-gradient-glass {
  background: linear-gradient(135deg, rgba(34,197,94,0.05), rgba(59,130,246,0.05));
}

/* --- Free Trial CTA --- */
.cta-free-trial {
  background: var(--brand-50);
  border: 2px solid var(--brand-300);
}

[data-theme="dark"] .cta-free-trial {
  background: rgba(34,197,94,0.08);
  border-color: rgba(34,197,94,0.3);
}

[data-theme="dark"] .cta-free-trial h3,
[data-theme="dark"] .cta-free-trial p {
  color: var(--text-primary);
}

[data-theme="dark"] .cta-free-trial .text-brand {
  color: var(--brand-400);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .cta-free-trial {
    background: rgba(34,197,94,0.08);
    border-color: rgba(34,197,94,0.3);
  }
  :root:not([data-theme="light"]) .cta-free-trial h3,
  :root:not([data-theme="light"]) .cta-free-trial p {
    color: var(--text-primary);
  }
}

/* --- Glow Effects --- */
.glow-brand {
  box-shadow: 0 0 30px rgba(34,197,94,0.2), 0 0 60px rgba(34,197,94,0.1);
}

[data-theme="dark"] .glow-brand {
  box-shadow: 0 0 30px rgba(34,197,94,0.3), 0 0 60px rgba(34,197,94,0.15);
}