:root {
    --sidebar-width: 280px;
    --primary-dark: #0f172a;
    --secondary-dark: #1e293b;
    --accent: #042d87;
    --bg-light: #ffffff;
    --text-main: #334155;
    --border-color: #f2f5f9;
}

body {
    background-color: var(--bg-light);
    font-family: 'Plus Jakarta Sans', sans-serif;
    color: var(--text-main);
    overflow-x: hidden;
}

/* --- PREMIUM LOGIN --- */
#login-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top right, #1e293b 0%, #0f172a 100%);
    padding: 20px;
}
.login-card {
    width: 100%;
    max-width: 420px;
    padding: 40px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.25);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* --- MODERN SIDEBAR --- */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    background: var(--primary-dark);
    color: #94a3b8;
    z-index: 1050;
    overflow-y: auto;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    left: 0;
    border-right: 1px solid #334155;
}

.main-content {
    margin-left: var(--sidebar-width);
    padding: 32px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (max-width: 992px) {
    .sidebar { left: -280px; }
    .sidebar.active { left: 0; }
    .main-content { margin-left: 0; padding: 20px; }
    .mobile-header { display: flex !important; }
}

.mobile-header {
    display: none;
    background: var(--primary-dark);
    color: white;
    padding: 16px 20px;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 1040;
    border-bottom: 1px solid #334155;
}

.sidebar .nav-link {
    color: #94a3b8;
    padding: 12px 20px;
    margin: 4px 12px;
    border-radius: 8px;
    cursor: pointer;
    text-align: left;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 12px;
    border: 0;
    background: transparent;
    width: calc(100% - 24px);
}
.sidebar .nav-link:hover, .sidebar .nav-link.active {
    color: white;
    background: var(--accent);
}

.card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.02), 0 2px 4px -1px rgba(0,0,0,0.02);
    background: white;
    margin-bottom: 24px;
}
.section-header h2 {
    font-weight: 700;
    color: #0f172a;
    font-size: 1.5rem;
    letter-spacing: -0.02em;
}

.table-responsive { border-radius: 12px; border: 1px solid var(--border-color); background: white; }
.table { margin-bottom: 0; }
.table th {
    background-color: #f8fafc;
    color: #64748b;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
}
.table td {
    padding: 14px 16px;
    vertical-align: middle;
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border-color);
}

.form-control, .form-select {
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 0.875rem;
    transition: all 0.2s;
}
.form-control:focus, .form-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.stat-card {
    border-radius: 12px;
    padding: 20px;
    transition: transform 0.2s;
}
.stat-card h6 { font-size: 1.75rem; font-weight: 700; margin-top: 4px; }

.user-tag { font-size: 0.75rem; padding: 4px 10px; border-radius: 6px; background: #f1f5f9; color: #64748b; font-weight: 600; }

.nirapara-breadcrumb {
    font-size: 0.8125rem;
    margin-bottom: 1rem;
}
.nirapara-breadcrumb .breadcrumb-item a {
    color: #64748b;
    text-decoration: none;
}
.nirapara-breadcrumb .breadcrumb-item a:hover {
    color: var(--accent);
}
.nirapara-breadcrumb .breadcrumb-item.active {
    color: #0f172a;
    font-weight: 600;
}

.nav-tabs .nav-link.active { color: var(--accent) !important; border-bottom: 2px solid var(--accent) !important; }

/* --- PRINT LAYOUT --- */
@media print {
    .no-print { display: none !important; }
}
.invoice-badge-paid {
    border: 2px solid #16a34a; color: #16a34a; padding: 4px 12px; font-weight: 700;
    text-transform: uppercase; display: inline-block; border-radius: 4px;
}
.invoice-badge-unpaid {
    border: 2px solid #dc2626; color: #dc2626; padding: 4px 12px; font-weight: 700;
    text-transform: uppercase; display: inline-block; border-radius: 4px;
}