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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f0f2f5;
    color: #1a1a2e;
    min-height: 100vh;
}

/* Login */
.login-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #0f3460, #16213e);
}

.login-box {
    background: #fff;
    padding: 3rem;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    text-align: center;
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    color: #0f3460;
}

.login-box p {
    color: #666;
    margin-bottom: 1.5rem;
}

.login-box input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    margin-bottom: 1rem;
    transition: border-color 0.2s;
}

.login-box input:focus {
    outline: none;
    border-color: #0f3460;
}

.login-box button {
    width: 100%;
    padding: 12px;
    background: #0f3460;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
}

.login-box button:hover {
    background: #16213e;
}

.error {
    color: #e74c3c;
    margin-top: 1rem;
    font-size: 0.9rem;
}

/* Header */
header {
    background: #0f3460;
    color: #fff;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-left h1 {
    font-size: 1.4rem;
}

.subtitle {
    font-size: 0.85rem;
    opacity: 0.8;
}

.header-right {
    display: flex;
    gap: 0.75rem;
}

/* Buttons */
.btn-primary {
    background: #2ecc71;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: background 0.2s;
}

.btn-primary:hover {
    background: #27ae60;
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.3);
    padding: 8px 18px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.btn-secondary:hover {
    border-color: #fff;
    background: rgba(255,255,255,0.1);
}

.btn-danger {
    background: #e74c3c;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.btn-danger:hover {
    background: #c0392b;
}

/* Search */
.search-bar {
    padding: 1rem 2rem;
}

.search-bar input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    background: #fff;
    transition: border-color 0.2s;
}

.search-bar input:focus {
    outline: none;
    border-color: #0f3460;
}

/* Table */
.table-container {
    padding: 0 2rem;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

thead th {
    background: #16213e;
    color: #fff;
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
}

thead th:hover {
    background: #1a2744;
}

tbody tr {
    border-bottom: 1px solid #f0f0f0;
    cursor: pointer;
    transition: background 0.15s;
}

tbody tr:hover {
    background: #f7f9fc;
}

tbody td {
    padding: 12px 16px;
    font-size: 0.95rem;
}

.price-cell {
    font-weight: 600;
    color: #0f3460;
}

.actions-cell {
    white-space: nowrap;
}

.actions-cell button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 8px;
    font-size: 1.1rem;
    border-radius: 4px;
    transition: background 0.15s;
}

.actions-cell button:hover {
    background: #f0f0f0;
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: #888;
    font-size: 1.1rem;
}

/* Summary */
.summary-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
    margin: 1rem 2rem 2rem;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
    font-weight: 600;
}

#total-billing {
    font-size: 1.15rem;
    color: #0f3460;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal-content {
    background: #fff;
    border-radius: 16px;
    width: 100%;
    max-width: 700px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid #eee;
}

.modal-header h2 {
    font-size: 1.3rem;
    color: #0f3460;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: #999;
    line-height: 1;
}

.modal-close:hover {
    color: #333;
}

/* Form */
form {
    padding: 1.5rem;
}

form h3 {
    font-size: 1rem;
    color: #0f3460;
    margin: 1.25rem 0 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #f0f2f5;
}

form h3:first-child {
    margin-top: 0;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: #555;
    margin-bottom: 0.3rem;
}

.form-group input,
.form-group textarea {
    padding: 10px 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: border-color 0.2s;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #0f3460;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    border-top: 1px solid #eee;
    justify-content: flex-end;
}

.form-actions .btn-secondary {
    color: #666;
    border-color: #ddd;
}

.form-actions .btn-secondary:hover {
    color: #333;
    border-color: #999;
}

/* Detail view */
#detail-body {
    padding: 1.5rem;
}

.detail-section {
    margin-bottom: 1.5rem;
}

.detail-section h3 {
    font-size: 1rem;
    color: #0f3460;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #f0f2f5;
}

.detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem 2rem;
}

.detail-item {
    padding: 0.4rem 0;
}

.detail-label {
    font-size: 0.8rem;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-value {
    font-size: 0.95rem;
    font-weight: 500;
    color: #1a1a2e;
    word-break: break-word;
}

.detail-value.empty {
    color: #ccc;
    font-style: italic;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .form-grid,
    .detail-grid {
        grid-template-columns: 1fr;
    }

    .summary-bar {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    .table-container {
        padding: 0 1rem;
    }

    .search-bar {
        padding: 1rem;
    }

    .summary-bar {
        margin: 1rem;
    }

    thead th,
    tbody td {
        padding: 10px 8px;
        font-size: 0.85rem;
    }
}