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

:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --success: #16a34a;
    --warning: #d97706;
    --bg: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text: #1e293b;
    --text-muted: #64748b;
    --radius: 6px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0 1.5rem;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.logo {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary);
    text-decoration: none;
}

#nav-links {
    display: flex;
    gap: 1rem;
    align-items: center;
}

#nav-links a, #nav-links button {
    font-size: 0.875rem;
    text-decoration: none;
    color: var(--text-muted);
}

#nav-links a:hover {
    color: var(--text);
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    line-height: 1.5;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-primary:disabled {
    background: #93c5fd;
    cursor: not-allowed;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    background: var(--danger-hover);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg);
}

.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.alert-error {
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
}

.alert-success {
    background: #f0fdf4;
    color: var(--success);
    border: 1px solid #bbf7d0;
}

.alert-warning {
    background: #fffbeb;
    color: var(--warning);
    border: 1px solid #fde68a;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

th, td {
    text-align: left;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border);
}

th {
    font-weight: 600;
    background: var(--bg);
}

tr:hover {
    background: var(--bg);
}

tr.discrepancy {
    background: #fef2f2;
}

tr.discrepancy:hover {
    background: #fee2e2;
}

td.editable {
    cursor: pointer;
    position: relative;
}

td.editable:hover {
    background: #eff6ff;
}

td.editable input {
    width: 100%;
    padding: 0.25rem;
    border: 1px solid var(--primary);
    border-radius: 3px;
    font-size: inherit;
}

.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s;
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--primary);
    background: #eff6ff;
}

.upload-zone p {
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-success {
    background: #dcfce7;
    color: var(--success);
}

.badge-error {
    background: #fef2f2;
    color: var(--danger);
}

.badge-warning {
    background: #fffbeb;
    color: var(--warning);
}

.auth-container {
    max-width: 400px;
    margin: 4rem auto;
}

.auth-container h1 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.auth-toggle {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.auth-toggle a {
    color: var(--primary);
    text-decoration: none;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.page-header h1 {
    font-size: 1.25rem;
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.modal {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 1.5rem;
    min-width: 400px;
    max-width: 90vw;
}

.modal h2 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.modal-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
    margin-top: 1rem;
}

.reconciliation-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.reconciliation-summary .stat {
    padding: 1rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.reconciliation-summary .stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.reconciliation-summary .stat-value {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 0.25rem;
}