/* Dark theme variables and base styles */
:root {
    /* Brand */
    --primary: #3B82F6;
    --primary-dark: #2563EB;
    --primary-light: rgba(59, 130, 246, 0.1);
    --primary-glow: rgba(59, 130, 246, 0.3);

    --secondary: #10B981;
    --secondary-light: rgba(16, 185, 129, 0.1);
    --secondary-glow: rgba(16, 185, 129, 0.3);

    --warning: #F59E0B;
    --warning-light: rgba(245, 158, 11, 0.1);
    --warning-glow: rgba(245, 158, 11, 0.3);

    --danger: #EF4444;
    --danger-light: rgba(239, 68, 68, 0.1);
    --danger-glow: rgba(239, 68, 68, 0.3);

    --info: #8B5CF6;
    --info-light: rgba(139, 92, 246, 0.1);

    /* Dark Backgrounds */
    --bg-primary: #0F172A;
    --bg-secondary: #0B1220;
    --bg-tertiary: #111827;
    --bg-card: #0F172A;
    --bg-hover: #162133;

    /* Text */
    --text-primary: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-light: #94A3B8;
    --text-muted: #64748B;

    /* Borders & Shadows */
    --border: rgba(148, 163, 184, 0.08);
    --border-light: rgba(148, 163, 184, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 6px 18px rgba(2,6,23,0.6);
    --shadow-lg: 0 12px 30px rgba(2,6,23,0.7);

    /* Layout */
    --sidebar-width: 280px;
    --header-height: 70px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

/* Base reset for dark theme */
* { box-sizing: border-box; }
html,body { height: 100%; }
body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Utility classes for modern UI */
.container { max-width: 1200px; margin: 0 auto; padding: 16px; }
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: var(--shadow-sm);
}

.header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 0 18px;
    background: linear-gradient(90deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
    border-bottom: 1px solid var(--border);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 10px;
    font-weight: 600;
    color: var(--text-primary);
    background: transparent;
}

.btn-primary { background: linear-gradient(180deg, var(--primary), var(--primary-dark)); box-shadow: var(--shadow-md); }
.btn-ghost { background: rgba(255,255,255,0.02); border: 1px solid var(--border); }

h1,h2,h3 { margin: 0 0 8px 0; color: var(--text-primary); }
p { color: var(--text-secondary); }

/* Cards grid */
.grid { display: grid; gap: 12px; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Small helpers */
.muted { color: var(--text-muted); }
.text-primary { color: var(--text-primary); }

/* Responsive tweaks */
@media (max-width: 900px) {
    .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
    .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
}