@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700&display=swap');

:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --secondary: #10B981;
    --dark: #111827;
    --light: #F3F4F6;
    --white: #FFFFFF;
    --danger: #EF4444;
    --warning: #F59E0B;
    --border: #E5E7EB;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--light);
    color: var(--dark);
    margin: 0;
    padding: 0;
}

/* Typography */
h1, h2, h3, h4 {
    color: var(--dark);
    margin-bottom: 1rem;
}

/* Navbar */
.navbar {
    background-color: var(--white);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    padding: 1rem 2rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}
.navbar .nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}
.nav-links {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
}
.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 600;
    transition: color 0.3s;
}
.nav-links a:hover {
    color: var(--primary);
}
.btn-logout {
    color: var(--danger) !important;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}
.mt-4 { margin-top: 1.5rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-3 { margin-bottom: 1rem; }
.d-flex { display: flex; flex-wrap: wrap; gap: 1rem; }
.justify-content-between { justify-content: space-between; }
.align-items-center { align-items: center; }

/* Cards & Forms */
.card {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05);
}
.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 1rem;
}
.form-group {
    flex: 1;
    min-width: 250px;
}
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #374151;
}
.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid #9CA3AF;
    border-radius: 8px;
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.3s, box-shadow 0.3s;
}
.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    transition: background 0.3s, transform 0.1s;
}
.btn:active {
    transform: translateY(2px);
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: #6B7280; color: var(--white); }
.btn-secondary:hover { background: #4B5563; }
.btn-danger { background: var(--danger); color: var(--white); }
.btn-danger:hover { background: #DC2626; }
.btn-info { background: #0EA5E9; color: var(--white); }
.btn-info:hover { background: #0284C7; }
.btn-block { width: 100%; display: block; }
.btn-sm { padding: 0.4rem 0.8rem; font-size: 0.875rem; }

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
}
.table th, .table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.table th {
    background-color: #F9FAFB;
    font-weight: 600;
    color: #4B5563;
}
.table tbody tr:hover {
    background-color: #F9FAFB;
}

/* Badges */
.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
}
.badge-success { background: #D1FAE5; color: #065F46; }
.badge-warning { background: #FEF3C7; color: #92400E; }

/* Login Page specific */
.login-body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}
.login-container {
    width: 100%;
    max-width: 400px;
    padding: 1rem;
}
.login-box {
    background: var(--white);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
    text-align: center;
}
.login-box h2 {
    margin-top: 0;
    color: var(--primary);
    font-size: 1.8rem;
    margin-bottom: 2rem;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}
.alert-danger {
    background: #FEE2E2;
    color: #991B1B;
    border: 1px solid #F87171;
}

/* Printable Invoice */
@media print {
    .navbar, .btn, .no-print {
        display: none !important;
    }
    body {
        background: #fff;
    }
    .container {
        padding: 0;
        max-width: 100%;
    }
    .card {
        box-shadow: none;
        border: 1px solid #000;
    }
}

/* Responsive Design */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    .card {
        padding: 1rem;
    }
    .table {
        min-width: 600px;
    }
    .form-group {
        min-width: 100%;
    }
    .d-flex {
        flex-direction: column;
        align-items: stretch;
    }
    .navbar {
        flex-direction: column;
        text-align: center;
        padding: 1rem;
    }
    .nav-links {
        justify-content: center;
        width: 100%;
    }
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    .form-row {
        flex-direction: column;
        gap: 1rem;
    }
    .form-row.align-items-end .form-group {
        margin-bottom: 1rem !important;
    }
    .form-row.align-items-end .btn {
        margin-left: 0 !important;
    }
}