/**
 * Daily Expense Tracker - Main Stylesheet
 * Professional Business Design
 */

:root {
    --primary: #1e3a5f;
    --primary-light: #2d5a87;
    --primary-dark: #142840;
    --accent: #0d9488;
    --accent-light: #14b8a6;
    --success: #059669;
    --warning: #d97706;
    --danger: #dc2626;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --white: #ffffff;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}
a:hover { color: var(--accent); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-1px);
}
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #047857; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #b91c1c; }
.btn-outline {
    background: transparent;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
}
.btn-outline:hover {
    background: var(--gray-100);
    border-color: var(--gray-400);
}
.btn-sm { padding: 0.375rem 0.75rem; font-size: 0.8125rem; }
.btn-lg { padding: 0.75rem 1.5rem; font-size: 1rem; }

/* Form Controls */
.form-group {
    margin-bottom: 1rem;
}
.form-label {
    display: block;
    margin-bottom: 0.375rem;
    font-weight: 500;
    color: var(--gray-700);
}
.form-control {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 0.9375rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.15);
}
.form-control.is-invalid {
    border-color: var(--danger);
}
.error-text {
    font-size: 0.8125rem;
    color: var(--danger);
    margin-top: 0.25rem;
}
select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.card-header {
    padding: 1rem 1.25rem;
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    font-weight: 600;
    color: var(--gray-800);
}
.card-body { padding: 1.25rem; }
.card-footer {
    padding: 1rem 1.25rem;
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
}
.table th,
.table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}
.table th {
    font-weight: 600;
    color: var(--gray-700);
    background: var(--gray-50);
}
.table tbody tr:hover {
    background: var(--gray-50);
}
.table-actions { white-space: nowrap; }
.table-actions .btn { margin-right: 0.25rem; }

/* Alert */
.alert {
    padding: 0.875rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}
.alert-success { background: #d1fae5; color: #065f46; }
.alert-danger { background: #fee2e2; color: #991b1b; }
.alert-warning { background: #fef3c7; color: #92400e; }
.alert-info { background: #dbeafe; color: #1e40af; }

/* Badge */
.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 4px;
}
.badge-success { background: #d1fae5; color: #065f46; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-warning { background: #fef3c7; color: #92400e; }

/* Utility */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mt-2 { margin-top: 0.5rem; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }