/* ============================================================
   LeadVerifier Design System
   Premium SaaS CSS — Clean, Modern, Professional
   ============================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ── CSS Custom Properties ── */
:root {
    /* Colors — Indigo/Slate palette */
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    --primary-200: #c7d2fe;
    --primary-300: #a5b4fc;
    --primary-400: #818cf8;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;
    --primary-800: #3730a3;
    --primary-900: #312e81;

    --secondary-500: #8b5cf6;
    --secondary-600: #7c3aed;

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

    /* Semantic */
    --success-50: #ecfdf5;
    --success-500: #10b981;
    --success-600: #059669;
    --warning-50: #fffbeb;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    --danger-50: #fef2f2;
    --danger-500: #ef4444;
    --danger-600: #dc2626;
    --info-50: #eff6ff;
    --info-500: #3b82f6;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;

    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* 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 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);

    /* Layout */
    --sidebar-width: 260px;
    --header-height: 64px;
    --max-width: 1280px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--slate-800);
    background-color: var(--slate-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--primary-600); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--primary-700); }

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

h1, h2, h3, h4, h5, h6 { 
    color: var(--slate-900); 
    font-weight: 700; 
    line-height: 1.3;
    letter-spacing: -0.02em;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.625rem 1.25rem;
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 600;
    line-height: 1;
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
    text-decoration: none;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: #fff;
    box-shadow: 0 1px 3px rgba(79, 70, 229, 0.3);
}
.btn-primary:hover { 
    background: linear-gradient(135deg, var(--primary-700), var(--primary-800));
    color: #fff;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.35); 
    transform: translateY(-1px); 
}

.btn-secondary {
    background: #fff;
    color: var(--slate-700);
    border-color: var(--slate-300);
}
.btn-secondary:hover { background: var(--slate-50); border-color: var(--slate-400); color: var(--slate-900); }

.btn-success { background: var(--success-600); color: #fff; }
.btn-success:hover { background: var(--success-500); color: #fff; transform: translateY(-1px); }

.btn-danger { background: var(--danger-600); color: #fff; }
.btn-danger:hover { background: var(--danger-500); color: #fff; }

.btn-ghost { background: transparent; color: var(--slate-600); }
.btn-ghost:hover { background: var(--slate-100); color: var(--slate-900); }

.btn-sm { padding: 0.375rem 0.75rem; font-size: var(--font-size-xs); }
.btn-lg { padding: 0.875rem 2rem; font-size: var(--font-size-base); }
.btn-xl { padding: 1rem 2.5rem; font-size: var(--font-size-lg); border-radius: var(--radius-xl); }

.btn-icon { padding: 0.5rem; border-radius: var(--radius-md); }

.btn:disabled, .btn.disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* ── Forms ── */
.form-group { margin-bottom: var(--space-5); }
.form-label { display: block; font-size: var(--font-size-sm); font-weight: 500; color: var(--slate-700); margin-bottom: var(--space-2); }

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    color: var(--slate-900);
    background-color: #fff;
    border: 1px solid var(--slate-300);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    outline: none;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-input::placeholder { color: var(--slate-400); }
.form-textarea { resize: vertical; min-height: 100px; }
.form-hint { font-size: var(--font-size-xs); color: var(--slate-500); margin-top: var(--space-1); }
.form-error { font-size: var(--font-size-xs); color: var(--danger-600); margin-top: var(--space-1); }

/* ── Cards ── */
.card {
    background: #fff;
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}
.card:hover { box-shadow: var(--shadow-md); }
.card-body { padding: var(--space-6); }
.card-header { padding: var(--space-5) var(--space-6); border-bottom: 1px solid var(--slate-100); display: flex; align-items: center; justify-content: space-between; }
.card-title { font-size: var(--font-size-lg); font-weight: 600; }
.card-footer { padding: var(--space-4) var(--space-6); border-top: 1px solid var(--slate-100); background: var(--slate-50); border-radius: 0 0 var(--radius-xl) var(--radius-xl); }

/* ── Stat Cards ── */
.stat-card { text-align: center; padding: var(--space-6); }
.stat-card .stat-value { font-size: var(--font-size-3xl); font-weight: 800; color: var(--slate-900); letter-spacing: -0.03em; }
.stat-card .stat-label { font-size: var(--font-size-sm); color: var(--slate-500); margin-top: var(--space-1); font-weight: 500; }
.stat-card .stat-icon { width: 48px; height: 48px; border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin: 0 auto var(--space-3); }

/* ── Badges ── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 0.125rem 0.625rem;
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    line-height: 1.5;
}
.badge-primary { background: var(--primary-50); color: var(--primary-700); }
.badge-success { background: var(--success-50); color: var(--success-600); }
.badge-warning { background: var(--warning-50); color: var(--warning-600); }
.badge-danger { background: var(--danger-50); color: var(--danger-600); }
.badge-info { background: var(--info-50); color: var(--info-500); }
.badge-neutral { background: var(--slate-100); color: var(--slate-600); }

/* Quality Badges */
.quality-excellent { background: linear-gradient(135deg, #fef3c7, #fde68a); color: #92400e; }
.quality-good { background: var(--success-50); color: var(--success-600); }
.quality-questionable { background: var(--warning-50); color: var(--warning-600); }
.quality-poor { background: var(--danger-50); color: var(--danger-600); }

/* ── Tables ── */
.data-table { width: 100%; border-collapse: collapse; }
.data-table thead th {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--slate-500);
    border-bottom: 2px solid var(--slate-200);
    text-align: left;
    white-space: nowrap;
    cursor: pointer;
    user-select: none;
}
.data-table thead th:hover { color: var(--slate-700); }
.data-table tbody tr {
    border-bottom: 1px solid var(--slate-100);
    transition: background var(--transition-fast);
}
.data-table tbody tr:hover { background: var(--slate-50); }
.data-table tbody td {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    color: var(--slate-700);
    vertical-align: middle;
}
.data-table .company-cell { font-weight: 600; color: var(--slate-900); }
.data-table .score-cell { font-weight: 700; font-size: var(--font-size-lg); }

/* ── Progress Bars ── */
.progress { height: 8px; background: var(--slate-200); border-radius: var(--radius-full); overflow: hidden; }
.progress-bar {
    height: 100%;
    border-radius: var(--radius-full);
    background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
    transition: width 0.5s ease;
}
.progress-bar.success { background: linear-gradient(90deg, var(--success-500), var(--success-600)); }

.progress-lg { height: 16px; border-radius: var(--radius-lg); }
.progress-lg .progress-bar { border-radius: var(--radius-lg); }

/* ── Score Circle ── */
.score-circle {
    width: 80px; height: 80px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: var(--font-size-2xl); font-weight: 800;
    color: #fff;
    position: relative;
}
.score-circle.excellent { background: linear-gradient(135deg, #f59e0b, #d97706); }
.score-circle.good { background: linear-gradient(135deg, var(--success-500), var(--success-600)); }
.score-circle.questionable { background: linear-gradient(135deg, var(--warning-500), var(--warning-600)); }
.score-circle.poor { background: linear-gradient(135deg, var(--danger-500), var(--danger-600)); }
.score-circle-lg { width: 120px; height: 120px; font-size: var(--font-size-4xl); }

/* ── Layout: App Shell ── */
.app-layout { display: flex; min-height: 100vh; }

.sidebar {
    width: var(--sidebar-width);
    background: var(--slate-900);
    color: #fff;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-slow);
    overflow-y: auto;
}

.sidebar-logo {
    padding: var(--space-6);
    display: flex; align-items: center; gap: var(--space-3);
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.sidebar-logo h1 { font-size: var(--font-size-xl); font-weight: 800; color: #fff; letter-spacing: -0.02em; }
.sidebar-logo .logo-icon {
    width: 36px; height: 36px;
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    border-radius: var(--radius-lg);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem;
}

.sidebar-nav { flex: 1; padding: var(--space-4) 0; }
.sidebar-section { padding: var(--space-2) var(--space-6); margin-top: var(--space-4); }
.sidebar-section-title { font-size: var(--font-size-xs); font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--slate-500); }

.sidebar-link {
    display: flex; align-items: center; gap: var(--space-3);
    padding: 0.625rem var(--space-6);
    font-size: var(--font-size-sm);
    color: var(--slate-400);
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
    text-decoration: none;
}
.sidebar-link:hover { color: #fff; background: rgba(255,255,255,0.05); }
.sidebar-link.active { color: #fff; background: rgba(99, 102, 241, 0.15); border-left-color: var(--primary-500); }
.sidebar-link .link-icon { font-size: 1.25rem; width: 24px; text-align: center; }

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-width: 0;
    max-width: 100%;
    overflow-x: hidden;
}

/* ── App Header ── */
.app-header {
    height: var(--header-height);
    background: #fff;
    border-bottom: 1px solid var(--slate-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-8);
    position: sticky;
    top: 0;
    z-index: 50;
}
.app-header-left { display: flex; align-items: center; gap: var(--space-4); min-width: 0; }
.app-header-right { display: flex; align-items: center; gap: var(--space-4); }

.page-title-bar { font-size: var(--font-size-lg); font-weight: 700; color: var(--slate-900); }
.breadcrumb { display: flex; align-items: center; gap: var(--space-2); font-size: var(--font-size-sm); color: var(--slate-500); }
.breadcrumb a { color: var(--slate-500); }
.breadcrumb a:hover { color: var(--primary-600); }
.breadcrumb-sep { color: var(--slate-300); }

.content-area { 
    padding: var(--space-8); 
    flex: 1; 
    min-width: 0;
    max-width: 100%;
    overflow-x: hidden;
}

/* ── Mobile Hamburger & Close Button ── */
.mobile-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: var(--slate-100);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    color: var(--slate-700);
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 0;
    flex-shrink: 0;
}
.mobile-toggle:hover {
    background: var(--slate-200);
    color: var(--slate-900);
}
.mobile-toggle:active {
    transform: scale(0.95);
}

.sidebar-close-btn {
    display: none;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #fff;
    font-size: 1.15rem;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    margin-left: auto;
    transition: all var(--transition-fast);
}
.sidebar-close-btn:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* ── Container & Grid System ── */
.container { width: 100%; max-width: var(--max-width); margin-left: auto; margin-right: auto; padding-left: var(--space-6); padding-right: var(--space-6); }

.grid { display: grid; gap: var(--space-6); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

.col-span-1 { grid-column: span 1; }
.col-span-2 { grid-column: span 2; }
.col-span-3 { grid-column: span 3; }
.col-span-full { grid-column: 1 / -1; }

/* ── Settings Layout & Multi-Column System ── */
.settings-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: var(--space-8);
    align-items: start;
}
.settings-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.settings-nav-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 11px 16px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--slate-600);
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.settings-nav-btn:hover {
    background: var(--slate-100);
    color: var(--slate-900);
}
.settings-nav-btn.active {
    background: var(--primary-50);
    color: var(--primary-700);
    font-weight: 600;
    border-color: var(--primary-200);
}
.settings-nav-icon {
    font-size: 1.15rem;
    width: 22px;
    text-align: center;
    flex-shrink: 0;
}
.settings-panel {
    display: none;
}
.settings-panel.active {
    display: block;
    animation: fadeIn 0.2s ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Page Header Standard ── */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}
.page-header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-shrink: 0;
}

.settings-mobile-picker {
    display: none;
}

@media (max-width: 860px) {
    .page-header {
        margin-bottom: var(--space-6);
        gap: var(--space-4);
    }
    .page-header-actions {
        margin-top: var(--space-2);
        margin-bottom: var(--space-3);
        width: 100%;
    }
    .page-header-actions .btn {
        width: 100%;
        padding: 12px 20px;
        font-size: 0.9375rem;
    }
    .settings-mobile-picker {
        display: block;
        margin-top: var(--space-4);
        margin-bottom: var(--space-6);
        padding: var(--space-4);
        background: #fff;
        border: 1px solid var(--slate-200);
        border-radius: var(--radius-xl);
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    }
    .settings-all-divider {
        border: none !important;
        margin: 0 !important;
        padding: 0 !important;
    }
    .settings-layout {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    .settings-sidebar-card {
        position: static !important;
        padding: 0 !important;
        background: transparent !important;
        border: none !important;
        box-shadow: none !important;
        margin-bottom: var(--space-6) !important;
    }
    .settings-sidebar-card .text-xs {
        display: none;
    }
    .settings-nav {
        flex-direction: row;
        overflow-x: auto;
        padding: 6px 4px 14px 4px;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        gap: 10px;
        margin-bottom: var(--space-4);
    }
    .settings-nav::-webkit-scrollbar {
        display: none;
    }
    .settings-nav-btn {
        white-space: nowrap;
        padding: 10px 18px;
        flex: 0 0 auto;
        width: auto;
        background: #fff;
        border: 1px solid var(--slate-200);
        border-radius: var(--radius-full);
        box-shadow: 0 1px 3px rgba(0,0,0,0.05);
        font-size: 0.875rem;
    }
    .settings-nav-btn.active {
        background: var(--primary-600);
        color: #fff;
        border-color: var(--primary-600);
        box-shadow: 0 3px 10px rgba(79, 70, 229, 0.35);
    }
    .settings-nav-btn.active .badge {
        background: rgba(255, 255, 255, 0.25);
        color: #fff;
    }
    .col-span-2, .col-span-3, .col-span-full {
        grid-column: span 1 !important;
    }
}

/* ── Flexbox Utilities ── */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ── Spacing Utilities ── */
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.px-2 { padding-left: var(--space-2); padding-right: var(--space-2); }
.px-3 { padding-left: var(--space-3); padding-right: var(--space-3); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.py-1 { padding-top: var(--space-1); padding-bottom: var(--space-1); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-3 { padding-top: var(--space-3); padding-bottom: var(--space-3); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }

/* ── Text Utilities ── */
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--slate-500); }
.text-primary { color: var(--primary-600); }
.text-success { color: var(--success-600); }
.text-danger { color: var(--danger-600); }
.text-warning { color: var(--warning-600); }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ── Modals ── */
.modal-overlay {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center;
    z-index: 1000;
    opacity: 0; visibility: hidden;
    transition: all var(--transition-base);
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal {
    background: #fff;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    width: 90%; max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(20px);
    transition: transform var(--transition-base);
}
.modal-overlay.active .modal { transform: translateY(0); }
.modal-header { padding: var(--space-6); border-bottom: 1px solid var(--slate-100); display: flex; justify-content: space-between; align-items: center; }
.modal-body { padding: var(--space-6); }
.modal-footer { padding: var(--space-4) var(--space-6); border-top: 1px solid var(--slate-100); display: flex; justify-content: flex-end; gap: var(--space-3); }

/* ── Toast Notifications ── */
.toast-container { position: fixed; top: var(--space-6); right: var(--space-6); z-index: 9999; display: flex; flex-direction: column; gap: var(--space-3); }
.toast {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    display: flex; align-items: center; gap: var(--space-3);
    min-width: 320px; max-width: 480px;
    animation: slideIn 0.3s ease;
    border-left: 4px solid;
}
.toast-success { background: #fff; color: var(--success-600); border-left-color: var(--success-500); }
.toast-error { background: #fff; color: var(--danger-600); border-left-color: var(--danger-500); }
.toast-warning { background: #fff; color: var(--warning-600); border-left-color: var(--warning-500); }
.toast-info { background: #fff; color: var(--info-500); border-left-color: var(--info-500); }
.toast-close { margin-left: auto; cursor: pointer; opacity: 0.5; font-size: 1.2rem; }
.toast-close:hover { opacity: 1; }

@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes slideOut { from { transform: translateX(0); opacity: 1; } to { transform: translateX(100%); opacity: 0; } }

/* ── Empty States ── */
.empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-8);
}
.empty-state .empty-icon { font-size: 4rem; margin-bottom: var(--space-4); opacity: 0.3; }
.empty-state h3 { color: var(--slate-700); margin-bottom: var(--space-2); }
.empty-state p { color: var(--slate-500); margin-bottom: var(--space-6); max-width: 400px; margin-left: auto; margin-right: auto; }

/* ── Pagination ── */
.pagination { display: flex; align-items: center; gap: var(--space-1); }
.page-link {
    display: flex; align-items: center; justify-content: center;
    width: 36px; height: 36px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm); font-weight: 500;
    color: var(--slate-600);
    text-decoration: none;
    transition: all var(--transition-fast);
}
.page-link:hover { background: var(--slate-100); color: var(--slate-900); }
.page-link.active { background: var(--primary-600); color: #fff; }
.page-link.disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Skeleton Loading ── */
.skeleton { background: linear-gradient(90deg, var(--slate-200) 25%, var(--slate-100) 50%, var(--slate-200) 75%); background-size: 200% 100%; animation: shimmer 1.5s infinite; border-radius: var(--radius-md); }
.skeleton-text { height: 14px; margin-bottom: 8px; }
.skeleton-heading { height: 24px; width: 60%; margin-bottom: 16px; }
.skeleton-card { height: 120px; }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ── Dropdown ── */
.dropdown { position: relative; }
.dropdown-menu {
    position: absolute; top: 100%; right: 0;
    background: #fff; border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
    min-width: 200px; padding: var(--space-2);
    z-index: 500;
    opacity: 0; visibility: hidden; transform: translateY(8px);
    transition: all var(--transition-fast);
}
.dropdown.open .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-item {
    display: flex; align-items: center; gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    color: var(--slate-700);
    border-radius: var(--radius-md);
    cursor: pointer; text-decoration: none;
    transition: background var(--transition-fast);
}
.dropdown-item:hover { background: var(--slate-50); color: var(--slate-900); }
.dropdown-divider { height: 1px; background: var(--slate-100); margin: var(--space-2) 0; }

/* ── Tooltips ── */
[data-tooltip] { position: relative; }
[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute; bottom: calc(100% + 8px); left: 50%; transform: translateX(-50%);
    background: var(--slate-800); color: #fff;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs); font-weight: 500;
    white-space: nowrap; z-index: 100;
}

/* ── Checkbox ── */
.checkbox-wrapper { display: flex; align-items: center; gap: var(--space-2); cursor: pointer; }
.checkbox-wrapper input[type="checkbox"] {
    width: 18px; height: 18px;
    border: 2px solid var(--slate-300);
    border-radius: var(--radius-sm);
    cursor: pointer;
    accent-color: var(--primary-600);
}

/* ── Tags ── */
.tag {
    display: inline-flex; align-items: center; gap: var(--space-1);
    padding: 0.125rem 0.5rem;
    font-size: var(--font-size-xs); font-weight: 500;
    border-radius: var(--radius-full);
    background: var(--primary-50); color: var(--primary-700);
}
.tag-dot { width: 6px; height: 6px; border-radius: 50%; }

/* ── Signal Indicators ── */
.signal-check { color: var(--success-500); font-weight: 600; }
.signal-cross { color: var(--danger-500); font-weight: 600; }
.signal-warn { color: var(--warning-500); font-weight: 600; }

/* ── File Upload Zone ── */
.upload-zone {
    border: 2px dashed var(--slate-300);
    border-radius: var(--radius-xl);
    padding: var(--space-12) var(--space-8);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--slate-50);
}
.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--primary-500);
    background: var(--primary-50);
}
.upload-zone .upload-icon { font-size: 3rem; margin-bottom: var(--space-4); opacity: 0.4; }
.upload-zone h4 { color: var(--slate-700); margin-bottom: var(--space-2); }
.upload-zone p { color: var(--slate-500); font-size: var(--font-size-sm); }

/* ── Processing Animation ── */
.processing-bar { position: relative; overflow: hidden; }
.processing-bar::after {
    content: '';
    position: absolute; top: 0; left: -50%; width: 50%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: processingShimmer 1.5s infinite;
}
@keyframes processingShimmer { 0% { left: -50%; } 100% { left: 150%; } }

/* ── Responsive & Mobile Layout System ── */
.table-responsive {
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    display: block;
    margin: 0;
}
.table-responsive > .data-table,
.table-responsive > table {
    width: 100%;
    margin-bottom: 0;
}

.sidebar-backdrop {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.65);
    backdrop-filter: blur(4px);
    z-index: 45;
    opacity: 0;
    transition: opacity var(--transition-base);
}
.sidebar-backdrop.active {
    display: block;
    opacity: 1;
}

@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-5 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
    .grid-2, .grid-3, .grid-4, .grid-5,
    [style*="grid-template-columns"] {
        grid-template-columns: 1fr !important;
    }
}

@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-100%);
        z-index: 150;
        box-shadow: 0 0 40px rgba(0,0,0,0.5);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .sidebar-close-btn {
        display: inline-flex;
    }
    .main-content {
        margin-left: 0;
        min-width: 0;
    }
    .mobile-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
    .app-header {
        padding: 0 var(--space-4);
        position: sticky;
        top: 0;
        z-index: 40;
        background: #ffffff;
    }
    .page-title-bar {
        font-size: var(--font-size-base);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 180px;
    }
    .content-area {
        padding: var(--space-4);
        min-width: 0;
    }

    /* Page top action bars wrap gracefully */
    .content-area > .flex.justify-between:first-child,
    .page-header {
        flex-direction: column;
        align-items: stretch !important;
        gap: var(--space-3);
    }
    .content-area > .flex.justify-between:first-child > .flex,
    .page-header-actions {
        flex-wrap: wrap;
        width: 100%;
    }
    .content-area > .flex.justify-between:first-child .btn,
    .page-header-actions .btn {
        flex: 1 1 auto;
        justify-content: center;
        text-align: center;
    }

    /* Card headers wrap cleanly on small screens */
    .card-header.flex {
        flex-direction: column;
        align-items: flex-start !important;
        gap: var(--space-2);
    }
    .card-header.flex > *:last-child {
        align-self: flex-start;
    }

    /* Search & Filter bars stack on mobile */
    .card-body form.flex {
        flex-direction: column;
        align-items: stretch !important;
        gap: var(--space-3);
    }
    .card-body form.flex input.form-input,
    .card-body form.flex select.form-select,
    .card-body form.flex button {
        max-width: 100% !important;
        width: 100%;
    }

    /* Data table horizontal scroll */
    .card-body.p-0,
    .table-responsive {
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    .data-table {
        min-width: 540px;
    }

    /* Modals responsive sizing */
    .modal {
        width: calc(100vw - 32px) !important;
        max-width: 480px !important;
        margin: var(--space-4) auto;
        max-height: 88vh;
        overflow-y: auto;
    }
    .modal-footer {
        flex-wrap: wrap;
    }
    .modal-footer .btn {
        flex: 1 1 auto;
    }

    /* Pre & code block overflow handling */
    pre {
        max-width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

/* ── Visibility ── */
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--slate-300); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--slate-400); }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); }