/*
  ╔═══════════════════════════════════════════════════════════════════════╗
  ║  RAG Platform Design System v3 — OLED Glass Edition                  ║
  ║  Noto Arabic · Glassmorphism · OLED Dark · RTL-first                 ║
  ║  Based on UI/UX Pro Max skill recommendations                         ║
  ╚═══════════════════════════════════════════════════════════════════════╝
*/

/* ── Arabic Fonts (Noto — best Arabic rendering) ─────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Noto+Naskh+Arabic:wght@400;500;600;700&family=Noto+Sans+Arabic:wght@300;400;500;600;700&display=swap');

:root {
  /* OLED-optimised backgrounds */
  --bg-primary:   #02030a;
  --bg-secondary: #07091a;
  --bg-card:      rgba(10, 15, 35, 0.72);
  --bg-card-hover:rgba(14, 22, 50, 0.82);
  --bg-input:     rgba(8, 12, 28, 0.80);

  /* Accent palette */
  --accent:       #6366f1;
  --accent-2:     #22d3ee;
  --accent-3:     #8b5cf6;
  --accent-hover: #818cf8;
  --accent-soft:  rgba(99, 102, 241, 0.14);
  --accent-glow:  rgba(99, 102, 241, 0.32);

  /* Text */
  --text-primary:   #eef2ff;
  --text-secondary: #a5b4ce;
  --text-muted:     #5a6a8a;

  /* Glass borders */
  --border:        rgba(255, 255, 255, 0.07);
  --border-active: rgba(99, 102, 241, 0.50);

  /* Semantic */
  --success:      #34d399;
  --success-soft: rgba(52, 211, 153, 0.13);
  --warning:      #fbbf24;
  --warning-soft: rgba(251, 191, 36, 0.13);
  --danger:       #fb7185;
  --danger-soft:  rgba(251, 113, 133, 0.13);

  /* Shape */
  --radius:    18px;
  --radius-sm: 12px;
  --radius-xs: 8px;

  /* Shadows */
  --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.45);
  --shadow-md: 0 20px 60px rgba(0, 0, 0, 0.60);

  /* Motion */
  --transition: 220ms cubic-bezier(0.2, 0.8, 0.2, 1);

  /* Typography */
  --font-heading: 'Noto Naskh Arabic', 'Georgia', serif;
  --font-body:    'Noto Sans Arabic', 'Segoe UI', sans-serif;
  --font-mono:    'Space Mono', 'Courier New', monospace;
  --line-height:  1.8;
}

[data-theme="light"] {
  --bg-primary:   #f5f7ff;
  --bg-secondary: #ffffff;
  --bg-card:      rgba(255, 255, 255, 0.90);
  --bg-card-hover:#f0f4ff;
  --bg-input:     #f1f5fe;

  --accent:       #5254e8;
  --accent-2:     #0891b2;
  --accent-3:     #7c3aed;
  --accent-hover: #3d40d6;
  --accent-soft:  rgba(82, 84, 232, 0.10);
  --accent-glow:  rgba(82, 84, 232, 0.20);

  --text-primary:   #0f172a;
  --text-secondary: #334155;
  --text-muted:     #64748b;

  --border:        rgba(82, 84, 232, 0.13);
  --border-active: rgba(82, 84, 232, 0.38);

  --success:      #059669;
  --success-soft: rgba(5, 150, 105, 0.10);
  --warning:      #b45309;
  --warning-soft: rgba(180, 83, 9, 0.10);
  --danger:       #e11d48;
  --danger-soft:  rgba(225, 29, 72, 0.10);

  --shadow-sm: 0 2px 14px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 14px 40px rgba(15, 23, 42, 0.13);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font-body);
  line-height: var(--line-height);
  background:
    radial-gradient(ellipse 1400px 700px at 15% -5%, rgba(99, 102, 241, 0.13), transparent 55%),
    radial-gradient(ellipse 1000px 500px at 88% 108%, rgba(139, 92, 246, 0.13), transparent 60%),
    radial-gradient(ellipse 600px 400px at 55% 50%, rgba(34, 211, 238, 0.05), transparent 60%),
    var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

.u-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.u-card:hover {
  border-color: var(--border-active);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.u-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  font: 600 0.84rem/1 var(--font-body);
  letter-spacing: 0.2px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

.u-btn svg { width: 16px; height: 16px; }

.u-btn-primary {
  color: #fff;
  background: linear-gradient(130deg, var(--accent), var(--accent-3));
  box-shadow: 0 10px 24px var(--accent-glow);
}

.u-btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 15px 30px var(--accent-glow);
}

.u-btn-ghost {
  background: color-mix(in srgb, var(--bg-input) 90%, transparent);
  border-color: var(--border);
  color: var(--text-secondary);
}

.u-btn-ghost:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.u-btn-danger {
  border-color: rgba(251, 113, 133, 0.25);
  color: var(--danger);
  background: var(--danger-soft);
}

.u-btn-sm { padding: 8px 12px; font-size: 0.76rem; }

.u-input,
textarea.u-input,
select.u-input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  background: color-mix(in srgb, var(--bg-input) 88%, transparent);
  color: var(--text-primary);
  font: 500 0.9rem/1.4 var(--font-body);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.u-input:focus {
  border-color: var(--border-active);
  box-shadow: 0 0 0 3px var(--accent-soft);
  background: var(--bg-card);
}

.u-input::placeholder { color: var(--text-muted); }

.u-label {
  display: inline-block;
  margin-bottom: 6px;
  color: var(--text-muted);
  font: 700 0.67rem/1 var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.u-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 999px;
  font: 700 0.69rem/1 var(--font-mono);
  letter-spacing: 0.2px;
}

.u-badge-success { background: var(--success-soft); color: var(--success); }
.u-badge-warning { background: var(--warning-soft); color: var(--warning); }
.u-badge-danger  { background: var(--danger-soft);  color: var(--danger); }
.u-badge-accent  { background: var(--accent-soft);  color: var(--accent); }

.theme-toggle,
.lang-toggle {
  display: inline-flex;
  align-items: center;
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-input) 86%, transparent);
  backdrop-filter: blur(10px);
}

.theme-toggle button,
.lang-toggle button {
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.theme-toggle button {
  width: 30px;
  height: 30px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle button svg { width: 15px; height: 15px; }

.lang-toggle button {
  padding: 5px 9px;
  border-radius: 999px;
  font: 700 0.68rem/1 var(--font-mono);
}

.theme-toggle button.active,
.lang-toggle button.active {
  color: var(--accent);
  background: var(--accent-soft);
}

.theme-toggle button:hover,
.lang-toggle button:hover {
  color: var(--text-primary);
  transform: translateY(-1px);
}

.u-toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 1200;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-card) 88%, transparent);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-md);
  padding: 12px 16px;
  font-size: 0.83rem;
  transform: translateY(22px);
  opacity: 0;
  transition: transform var(--transition), opacity var(--transition);
}

.u-toast.show { transform: translateY(0); opacity: 1; }
.u-toast.success { color: var(--success); border-color: rgba(52, 211, 153, 0.35); }
.u-toast.error { color: var(--danger); border-color: rgba(251, 113, 133, 0.35); }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes spin { to { transform: rotate(360deg); } }

::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--border-active) 65%, transparent);
  border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--accent) 70%, transparent);
}