:root {
    /* Brand colors */
    --color-primary: #2563eb;
    --color-primary-light: #3b82f6;
    --color-primary-dark: #1d4ed8;
    --color-primary-soft: #eff6ff;

    --color-accent: #10b981;
    --color-accent-light: #34d399;
    --color-accent-dark: #059669;
    --color-accent-soft: #ecfdf5;

    /* Surfaces */
    --color-surface: #ffffff;
    --color-background: #f4f6fa;
    --color-background-soft: #eef2f7;
    --color-input-bg: #f1f5f9;
    --color-border: #e2e8f0;
    --color-border-soft: #edf1f6;

    /* Text */
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-text-light: #94a3b8;

    /* Sidebar / brand panel */
    --color-sidebar-from: #1e3a5f;
    --color-sidebar-mid: #1e293b;
    --color-sidebar-to: #0f172a;
    --brand-gradient: linear-gradient(165deg, var(--color-sidebar-from) 0%, var(--color-sidebar-mid) 45%, var(--color-sidebar-to) 100%);
    --color-sidebar-hover: rgba(255, 255, 255, 0.07);
    --color-sidebar-active: rgba(16, 185, 129, 0.16);

    /* Layout */
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 88px;
    --navbar-height: 76px;
    --content-max-width: 1440px;

    /* Elevation & shape */
    --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-sm: 0 4px 16px rgba(15, 23, 42, 0.05);
    --shadow-md: 0 12px 32px rgba(15, 23, 42, 0.08);
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 22px;
    --transition: 0.2s ease;

    /* Typography */
    --font-family: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    margin: 0;
    font-family: var(--font-family);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Shared buttons */
.btn-primary {
    --bs-btn-bg: var(--color-accent);
    --bs-btn-border-color: var(--color-accent);
    --bs-btn-hover-bg: var(--color-accent-dark);
    --bs-btn-hover-border-color: var(--color-accent-dark);
    --bs-btn-active-bg: var(--color-accent-dark);
    --bs-btn-active-border-color: var(--color-accent-dark);
    --bs-btn-focus-shadow-rgb: 16, 185, 129;
    font-weight: 600;
    border-radius: var(--radius-sm);
}

.btn-outline-primary {
    --bs-btn-color: var(--color-primary);
    --bs-btn-border-color: #bfdbfe;
    --bs-btn-hover-bg: var(--color-primary-soft);
    --bs-btn-hover-border-color: #93c5fd;
    --bs-btn-hover-color: var(--color-primary);
    --bs-btn-active-bg: var(--color-primary-soft);
    --bs-btn-active-border-color: #93c5fd;
    --bs-btn-active-color: var(--color-primary);
    --bs-btn-focus-shadow-rgb: 37, 99, 235;
    font-weight: 600;
    border-radius: var(--radius-sm);
    background: var(--color-surface);
}

/* Shared form controls */
.form-control {
    border-radius: var(--radius-sm);
    border-color: var(--color-border);
    background: var(--color-input-bg);
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.form-control:focus {
    border-color: #93c5fd;
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
    background: var(--color-surface);
}

.btn:focus,
.btn:active:focus,
.form-control:focus,
.form-check-input:focus {
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

/* Shared brand logo */
.brand-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent));
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.25);
    color: #ffffff;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    flex-shrink: 0;
}