/* ============================================================================
   MEB AI SaaS — Stylesheet
   MEB CSS Rules: clamp(), CSS variables, logical properties, 44px touch,
                  safe-area-inset, @layer, prefers-reduced-motion, focus-visible
   ============================================================================ */

@layer reset, base, components, utilities, themes;

/* ═══════════════ LAYER: RESET ═══════════════ */
@layer reset {
    *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
    body { line-height: 1.6; -webkit-font-smoothing: antialiased; }
    img, svg { max-width: 100%; display: block; }
    button, input, select, textarea { font: inherit; color: inherit; }
    a { color: inherit; text-decoration: none; }
    button { cursor: pointer; background: none; border: none; }
}

/* ═══════════════ LAYER: BASE (variables + light theme default) ═══════════════ */
@layer base {
    :root {
        /* iGulfMart Gold palette */
        --gold-50:  #FDF8EC;
        --gold-100: #F9EFD0;
        --gold-200: #F0DC9A;
        --gold-300: #E5C561;
        --gold-400: #D9AE30;
        --gold-500: #C9A84C;     /* primary gold */
        --gold-600: #A88A3A;
        --gold-700: #856C2C;
        --gold-800: #614F1F;
        --gold-900: #3D3013;

        /* Light theme (default) */
        --bg-primary:    #FFFFFF;
        --bg-secondary:  #F9FAFB;
        --bg-tertiary:   #F3F4F6;
        --bg-accent:     var(--gold-50);

        --text-primary:   #111827;
        --text-secondary: #4B5563;
        --text-tertiary:  #9CA3AF;
        --text-accent:    var(--gold-700);

        --border-light:  #E5E7EB;
        --border-medium: #D1D5DB;
        --border-strong: #9CA3AF;

        --shadow-sm:  0 1px 2px rgba(0,0,0,0.05);
        --shadow-md:  0 4px 12px rgba(0,0,0,0.08);
        --shadow-lg:  0 10px 30px rgba(0,0,0,0.12);

        --radius-sm: 6px;
        --radius-md: 10px;
        --radius-lg: 16px;
        --radius-xl: 24px;

        /* Semantic */
        --color-success: #10B981;
        --color-warning: #F59E0B;
        --color-danger:  #EF4444;
        --color-info:    #3B82F6;

        /* Typography — fluid */
        --fs-xs:   clamp(0.75rem,  0.72rem + 0.15vw, 0.8rem);
        --fs-sm:   clamp(0.85rem,  0.82rem + 0.15vw, 0.9rem);
        --fs-base: clamp(0.95rem,  0.92rem + 0.2vw,  1rem);
        --fs-md:   clamp(1.05rem,  1rem    + 0.3vw,  1.15rem);
        --fs-lg:   clamp(1.2rem,   1.1rem  + 0.5vw,  1.4rem);
        --fs-xl:   clamp(1.5rem,   1.3rem  + 1vw,    1.9rem);
        --fs-2xl:  clamp(2rem,     1.6rem  + 2vw,    2.8rem);
        --fs-3xl:  clamp(2.5rem,   2rem    + 2.5vw,  3.8rem);

        /* Spacing */
        --sp-1: 0.25rem;
        --sp-2: 0.5rem;
        --sp-3: 0.75rem;
        --sp-4: 1rem;
        --sp-6: 1.5rem;
        --sp-8: 2rem;
        --sp-12: 3rem;
        --sp-16: 4rem;

        /* Touch targets — iOS HIG 44px minimum */
        --touch-target: 44px;

        --transition-fast: 150ms ease;
        --transition-base: 250ms ease;
        --transition-slow: 400ms ease;
    }

    html, body { height: 100%; }
    body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        font-size: var(--fs-base);
        background: var(--bg-primary);
        color: var(--text-primary);
        min-height: 100dvh;
        padding-inline: env(safe-area-inset-left) env(safe-area-inset-right);
        transition: background var(--transition-base), color var(--transition-base);
    }

    body[dir="rtl"] { font-family: 'Noto Naskh Arabic', 'Amiri', Tahoma, sans-serif; }
}

/* ═══════════════ LAYER: THEMES (dark) ═══════════════ */
@layer themes {
    /* Dark theme via data-theme="dark" or prefers-color-scheme */
    [data-theme="dark"] {
        --bg-primary:    #0F1419;
        --bg-secondary:  #1A1F26;
        --bg-tertiary:   #252B35;
        --bg-accent:     #2A2419;

        --text-primary:   #F3F4F6;
        --text-secondary: #D1D5DB;
        --text-tertiary:  #9CA3AF;
        --text-accent:    var(--gold-400);

        --border-light:  #2D3340;
        --border-medium: #3F4754;
        --border-strong: #5A6271;

        --shadow-sm:  0 1px 2px rgba(0,0,0,0.3);
        --shadow-md:  0 4px 12px rgba(0,0,0,0.4);
        --shadow-lg:  0 10px 30px rgba(0,0,0,0.5);
    }

    /* Auto theme — respect OS */
    @media (prefers-color-scheme: dark) {
        :root:not([data-theme="light"]) {
            --bg-primary:    #0F1419;
            --bg-secondary:  #1A1F26;
            --bg-tertiary:   #252B35;
            --bg-accent:     #2A2419;
            --text-primary:   #F3F4F6;
            --text-secondary: #D1D5DB;
            --text-tertiary:  #9CA3AF;
            --text-accent:    var(--gold-400);
            --border-light:  #2D3340;
            --border-medium: #3F4754;
            --border-strong: #5A6271;
            --shadow-sm:  0 1px 2px rgba(0,0,0,0.3);
            --shadow-md:  0 4px 12px rgba(0,0,0,0.4);
            --shadow-lg:  0 10px 30px rgba(0,0,0,0.5);
        }
    }
}

/* ═══════════════ LAYER: COMPONENTS ═══════════════ */
@layer components {

    /* ─── Container ─── */
    .container {
        width: 100%;
        max-width: 1200px;
        margin-inline: auto;
        padding-inline: var(--sp-4);
    }

    /* ─── Navbar ─── */
    .navbar {
        position: sticky;
        top: 0;
        z-index: 100;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-light);
        backdrop-filter: blur(10px);
    }
    .navbar-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        min-height: 64px;
        gap: var(--sp-4);
    }
    .navbar-logo {
        font-size: var(--fs-lg);
        font-weight: 900;
        letter-spacing: -0.02em;
        background: linear-gradient(135deg, var(--gold-500), var(--gold-300));
        -webkit-background-clip: text;
        background-clip: text;
        -webkit-text-fill-color: transparent;
    }
    .navbar-links {
        display: flex;
        align-items: center;
        gap: var(--sp-6);
    }
    .navbar-links a {
        color: var(--text-secondary);
        font-weight: 500;
        transition: color var(--transition-fast);
        min-height: var(--touch-target);
        display: inline-flex;
        align-items: center;
    }
    .navbar-links a:hover { color: var(--text-accent); }
    .navbar-controls {
        display: flex;
        align-items: center;
        gap: var(--sp-2);
    }

    @media (max-width: 768px) {
        .navbar-links { display: none; }
        .navbar-links.open {
            display: flex;
            flex-direction: column;
            position: absolute;
            top: 100%;
            inset-inline: 0;
            background: var(--bg-primary);
            padding: var(--sp-4);
            border-bottom: 1px solid var(--border-light);
        }
    }

    /* ─── Buttons ─── */
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: var(--sp-2);
        min-height: var(--touch-target);
        padding-block: var(--sp-2);
        padding-inline: var(--sp-4);
        font-weight: 600;
        font-size: var(--fs-base);
        border-radius: var(--radius-md);
        transition: all var(--transition-fast);
        border: 1px solid transparent;
        text-align: center;
        white-space: nowrap;
    }
    .btn-primary {
        background: linear-gradient(135deg, var(--gold-500), var(--gold-600));
        color: white;
        box-shadow: var(--shadow-sm);
    }
    .btn-primary:hover {
        transform: translateY(-1px);
        box-shadow: var(--shadow-md);
        filter: brightness(1.05);
    }
    .btn-secondary {
        background: var(--bg-tertiary);
        color: var(--text-primary);
        border-color: var(--border-medium);
    }
    .btn-secondary:hover { background: var(--bg-accent); border-color: var(--gold-500); }
    .btn-ghost {
        background: transparent;
        color: var(--text-secondary);
    }
    .btn-ghost:hover { background: var(--bg-tertiary); color: var(--text-primary); }
    .btn-danger { background: var(--color-danger); color: white; }
    .btn-sm { min-height: 36px; padding-inline: var(--sp-3); font-size: var(--fs-sm); }
    .btn-lg { min-height: 52px; padding-inline: var(--sp-6); font-size: var(--fs-md); }
    .btn-icon { width: var(--touch-target); padding: 0; }

    /* ─── Cards ─── */
    .card {
        background: var(--bg-secondary);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-lg);
        padding: var(--sp-6);
        box-shadow: var(--shadow-sm);
    }
    .card-hover:hover {
        border-color: var(--gold-500);
        box-shadow: var(--shadow-md);
        transform: translateY(-2px);
        transition: all var(--transition-base);
    }

    /* ─── Forms ─── */
    .form-group { margin-bottom: var(--sp-4); }
    .form-label {
        display: block;
        margin-bottom: var(--sp-2);
        font-size: var(--fs-sm);
        font-weight: 600;
        color: var(--text-secondary);
    }
    .form-input, .form-select, .form-textarea {
        width: 100%;
        min-height: var(--touch-target);
        padding: var(--sp-3);
        background: var(--bg-primary);
        color: var(--text-primary);
        border: 1px solid var(--border-medium);
        border-radius: var(--radius-md);
        font-size: var(--fs-base);
        transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
        outline: none;
        border-color: var(--gold-500);
        box-shadow: 0 0 0 3px rgba(201,168,76,0.15);
    }
    .form-input:focus-visible { outline: 2px solid var(--gold-500); outline-offset: 2px; }
    .form-hint { font-size: var(--fs-xs); color: var(--text-tertiary); margin-top: var(--sp-1); }
    .form-error { font-size: var(--fs-sm); color: var(--color-danger); margin-top: var(--sp-1); }

    /* ─── Alerts ─── */
    .alert {
        padding: var(--sp-3) var(--sp-4);
        border-radius: var(--radius-md);
        margin-bottom: var(--sp-4);
        border-inline-start: 4px solid;
    }
    .alert-success { background: rgba(16,185,129,0.1);  border-color: var(--color-success); color: var(--color-success); }
    .alert-error   { background: rgba(239,68,68,0.1);   border-color: var(--color-danger);  color: var(--color-danger); }
    .alert-warning { background: rgba(245,158,11,0.1);  border-color: var(--color-warning); color: var(--color-warning); }
    .alert-info    { background: rgba(59,130,246,0.1);  border-color: var(--color-info);    color: var(--color-info); }

    /* ─── Badge ─── */
    .badge {
        display: inline-flex;
        align-items: center;
        padding: 4px 10px;
        font-size: var(--fs-xs);
        font-weight: 600;
        border-radius: 50px;
        text-transform: uppercase;
        letter-spacing: 0.5px;
    }
    .badge-gold { background: var(--gold-100); color: var(--gold-700); border: 1px solid var(--gold-500); }
    .badge-success { background: rgba(16,185,129,0.15); color: var(--color-success); }
    .badge-danger { background: rgba(239,68,68,0.15); color: var(--color-danger); }

    /* ─── Hero section ─── */
    .hero {
        padding-block: clamp(3rem, 8vw, 6rem);
        text-align: center;
        background: radial-gradient(ellipse at top, var(--bg-accent), transparent 70%);
    }
    .hero h1 {
        font-size: var(--fs-3xl);
        font-weight: 900;
        letter-spacing: -0.03em;
        margin-bottom: var(--sp-4);
        background: linear-gradient(135deg, var(--gold-500), var(--gold-300));
        -webkit-background-clip: text;
        background-clip: text;
        -webkit-text-fill-color: transparent;
    }
    .hero p {
        font-size: var(--fs-md);
        color: var(--text-secondary);
        max-width: 640px;
        margin-inline: auto;
        margin-bottom: var(--sp-8);
    }
    .hero-actions { display: flex; gap: var(--sp-3); justify-content: center; flex-wrap: wrap; }

    /* ─── Feature grid ─── */
    .feature-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        gap: var(--sp-4);
        margin-block: var(--sp-8);
    }
    .feature-card {
        padding: var(--sp-6);
        background: var(--bg-secondary);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-lg);
        text-align: center;
        transition: all var(--transition-base);
    }
    .feature-card:hover {
        transform: translateY(-4px);
        border-color: var(--gold-500);
        box-shadow: var(--shadow-md);
    }
    .feature-icon {
        font-size: 3rem;
        margin-bottom: var(--sp-3);
    }
    .feature-card h3 {
        color: var(--text-accent);
        margin-bottom: var(--sp-2);
        font-size: var(--fs-md);
    }
    .feature-card p {
        color: var(--text-secondary);
        font-size: var(--fs-sm);
    }

    /* ─── Pricing grid ─── */
    .pricing-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: var(--sp-4);
    }
    .pricing-card {
        padding: var(--sp-6);
        background: var(--bg-secondary);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-lg);
        position: relative;
        transition: all var(--transition-base);
    }
    .pricing-card.featured {
        border-color: var(--gold-500);
        box-shadow: 0 0 0 3px rgba(201,168,76,0.2);
    }
    .pricing-card.featured::before {
        content: 'POPULAR';
        position: absolute;
        top: -12px;
        inset-inline-start: 50%;
        transform: translateX(-50%);
        background: linear-gradient(135deg, var(--gold-500), var(--gold-600));
        color: white;
        padding: 4px 16px;
        border-radius: 50px;
        font-size: var(--fs-xs);
        font-weight: 700;
        letter-spacing: 1px;
    }
    .pricing-name { font-size: var(--fs-lg); font-weight: 700; margin-bottom: var(--sp-2); }
    .pricing-price { font-size: var(--fs-2xl); font-weight: 900; color: var(--text-accent); margin-bottom: var(--sp-4); }
    .pricing-price small { font-size: var(--fs-base); color: var(--text-tertiary); font-weight: 400; }
    .pricing-features { list-style: none; margin-block: var(--sp-4); }
    .pricing-features li {
        padding-block: var(--sp-2);
        padding-inline-start: var(--sp-6);
        position: relative;
        color: var(--text-secondary);
        font-size: var(--fs-sm);
    }
    .pricing-features li::before {
        content: '✓';
        position: absolute;
        inset-inline-start: 0;
        color: var(--color-success);
        font-weight: bold;
    }

    /* ─── Table ─── */
    .table {
        width: 100%;
        border-collapse: collapse;
        background: var(--bg-secondary);
        border-radius: var(--radius-md);
        overflow: hidden;
    }
    .table th, .table td {
        padding: var(--sp-3);
        text-align: start;
        border-bottom: 1px solid var(--border-light);
    }
    .table th {
        background: var(--bg-tertiary);
        font-weight: 600;
        color: var(--text-secondary);
        font-size: var(--fs-sm);
        text-transform: uppercase;
        letter-spacing: 0.5px;
    }
    .table tbody tr:hover { background: var(--bg-tertiary); }

    /* ─── Code block ─── */
    .code {
        background: var(--bg-tertiary);
        color: var(--text-primary);
        padding: var(--sp-4);
        border-radius: var(--radius-md);
        font-family: 'SF Mono', Consolas, monospace;
        font-size: var(--fs-sm);
        overflow-x: auto;
        border: 1px solid var(--border-light);
    }
    code {
        background: var(--bg-tertiary);
        padding: 2px 6px;
        border-radius: 4px;
        font-family: 'SF Mono', Consolas, monospace;
        font-size: 0.9em;
        color: var(--text-accent);
    }

    /* ─── Language + Theme switcher ─── */
    .switcher {
        position: relative;
    }
    .switcher-btn {
        min-height: var(--touch-target);
        min-width: var(--touch-target);
        padding: var(--sp-2);
        border-radius: var(--radius-md);
        border: 1px solid var(--border-medium);
        background: var(--bg-primary);
        color: var(--text-primary);
        font-size: var(--fs-sm);
    }
    .switcher-btn:hover { border-color: var(--gold-500); }
    .switcher-menu {
        position: absolute;
        top: calc(100% + 4px);
        inset-inline-end: 0;
        background: var(--bg-primary);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-lg);
        min-width: 180px;
        max-height: 320px;
        overflow-y: auto;
        z-index: 50;
        padding: var(--sp-1);
    }
    .switcher-menu a {
        display: flex;
        align-items: center;
        gap: var(--sp-2);
        padding: var(--sp-2) var(--sp-3);
        min-height: var(--touch-target);
        border-radius: var(--radius-sm);
        color: var(--text-primary);
        font-size: var(--fs-sm);
    }
    .switcher-menu a:hover { background: var(--bg-tertiary); }
    .switcher-menu a.active { background: var(--gold-50); color: var(--gold-700); font-weight: 600; }

    /* ─── Footer ─── */
    .footer {
        padding-block: var(--sp-12);
        background: var(--bg-secondary);
        border-top: 1px solid var(--border-light);
        color: var(--text-tertiary);
        text-align: center;
    }

    /* ─── Dashboard sidebar ─── */
    .dashboard-layout {
        display: grid;
        grid-template-columns: 240px 1fr;
        min-height: calc(100dvh - 64px);
    }
    @media (max-width: 900px) { .dashboard-layout { grid-template-columns: 1fr; } }
    .sidebar {
        background: var(--bg-secondary);
        border-inline-end: 1px solid var(--border-light);
        padding: var(--sp-4);
    }
    .sidebar nav a {
        display: flex;
        align-items: center;
        gap: var(--sp-2);
        min-height: var(--touch-target);
        padding-inline: var(--sp-3);
        margin-bottom: var(--sp-1);
        border-radius: var(--radius-md);
        color: var(--text-secondary);
        font-weight: 500;
    }
    .sidebar nav a:hover, .sidebar nav a.active {
        background: var(--bg-accent);
        color: var(--text-accent);
    }
    .main-content { padding: var(--sp-6); }

    /* ─── Stats card ─── */
    .stats-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: var(--sp-4);
        margin-bottom: var(--sp-6);
    }
    .stat-card {
        padding: var(--sp-4);
        background: var(--bg-secondary);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-md);
    }
    .stat-label { font-size: var(--fs-xs); color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.5px; }
    .stat-value { font-size: var(--fs-xl); font-weight: 700; color: var(--text-primary); margin-top: var(--sp-1); }
    .stat-change { font-size: var(--fs-xs); margin-top: var(--sp-1); }
    .stat-change.up { color: var(--color-success); }
    .stat-change.down { color: var(--color-danger); }
}

/* ═══════════════ LAYER: UTILITIES ═══════════════ */
@layer utilities {
    .text-center { text-align: center; }
    .text-start  { text-align: start; }
    .text-end    { text-align: end; }
    .hidden      { display: none !important; }
    .flex        { display: flex; }
    .grid        { display: grid; }
    .items-center { align-items: center; }
    .justify-between { justify-content: space-between; }
    .gap-2 { gap: var(--sp-2); }
    .gap-4 { gap: var(--sp-4); }
    .mt-4 { margin-top: var(--sp-4); }
    .mb-4 { margin-bottom: var(--sp-4); }
    .py-8 { padding-block: var(--sp-8); }
    .mx-auto { margin-inline: auto; }

    .text-sm { font-size: var(--fs-sm); }
    .text-lg { font-size: var(--fs-lg); }
    .text-bold { font-weight: 700; }
    .text-muted { color: var(--text-tertiary); }
    .text-accent { color: var(--text-accent); }
}

/* ═══════════════ Accessibility: 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;
    }
}

/* ═══════════════ High contrast support ═══════════════ */
@media (forced-colors: active) {
    .btn, .form-input, .card, .pricing-card {
        border: 1px solid CanvasText;
    }
}