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

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1800px;
    margin: 0 auto;
    padding: 15px;
}

header {
    background-color: #2c3e50;
    color: white;
    padding: 15px 0;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

header h1 {
    text-align: center;
    font-size: 28px;
}

nav {
    background-color: #34495e;
    padding: 10px 0;
    margin-bottom: 20px;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: #2c3e50;
}

.card {
    background: white;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.dashboard-card {
    background: white;
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s;
    cursor: pointer;
}

.dashboard-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.dashboard-card h2 {
    color: #2c3e50;
    margin-bottom: 15px;
}

.dashboard-card p {
    color: #666;
    font-size: 14px;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.3s;
    margin: 5px;
}

.btn-sm {
    padding: 4px 8px;
    font-size: 12px;
}

.btn-primary {
    background-color: #3498db;
    color: white;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.btn-success {
    background-color: #27ae60;
    color: white;
}

.btn-success:hover {
    background-color: #229954;
}

.btn-danger {
    background-color: #e74c3c;
    color: white;
}

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

.btn-secondary {
    background-color: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background-color: #7f8c8d;
}

.form-group {
    margin-bottom: 8px;
}

.form-group label {
    display: block;
    margin-bottom: 2px;
    font-weight: 600;
    color: #2c3e50;
    font-size: 14px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 5px 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #3498db;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

table th,
table td {
    padding: 8px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

table th {
    background-color: #34495e;
    color: white;
    font-weight: 600;
    white-space: nowrap;
}

table tr:hover {
    background-color: #f8f9fa;
}

.items-table {
    margin-top: 10px;
}

.items-table-wrapper {
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 8px;
}

.items-table table {
    margin-bottom: 0;
}

.items-table table th,
.items-table table td {
    padding: 0px 4px;
}

.items-table table th {
    position: sticky;
    top: 0;
    z-index: 10;
}

.items-table input,
.items-table select {
    width: 100%;
    padding: 4px 6px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.total-section {
    margin-top: 10px;
    text-align: right;
}

.total-row {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    margin: 5px 0;
    font-size: 16px;
}

.total-row.grand-total {
    font-size: 20px;
    font-weight: bold;
    color: #2c3e50;
    border-top: 2px solid #2c3e50;
    padding-top: 10px;
}

.actions {
    margin-top: 15px;
    display: flex;
    justify-content: space-between;
    gap: 8px;
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.badge-draft {
    background-color: #95a5a6;
    color: white;
}

.badge-sent {
    background-color: #3498db;
    color: white;
}

.badge-approved {
    background-color: #27ae60;
    color: white;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state p {
    font-size: 18px;
    margin-bottom: 20px;
}

@media print {
    @page {
        size: A4;
        margin: 10mm 20mm 10mm 20mm;
    }

    * {
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
    }

    body {
        margin: 0 !important;
        padding: 0 20mm !important;
        background: white;
    }

    .container {
        max-width: 100% !important;
        margin: 0 !important;
        padding: 0 !important;
    }

    nav,
    .actions,
    .btn,
    header {
        display: none !important;
    }

    .card {
        box-shadow: none !important;
        border: none !important;
        padding: 0 !important;
        margin: 0 !important;
    }
}

/* タブレット対応 */
@media (max-width: 1024px) {
    .container {
        padding: 15px;
    }

    header h1 {
        font-size: 24px;
    }

    .dashboard-cards {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }

    nav ul {
        gap: 15px;
    }
}

/* スマートフォン対応 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    header {
        padding: 15px 0;
        margin-bottom: 15px;
    }

    header h1 {
        font-size: 20px;
        padding: 0 10px;
    }

    nav {
        padding: 10px 0;
        margin-bottom: 15px;
    }

    nav ul {
        gap: 10px;
        padding: 0 10px;
    }

    nav a {
        padding: 6px 12px;
        font-size: 13px;
    }

    .card {
        padding: 15px;
        margin-bottom: 15px;
    }

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

    .dashboard-cards {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .dashboard-card {
        padding: 20px;
    }

    .dashboard-card h2 {
        font-size: 18px;
    }

    .btn {
        padding: 8px 15px;
        font-size: 13px;
        width: 100%;
        text-align: center;
    }

    .btn-sm {
        padding: 6px 12px;
        font-size: 12px;
        width: auto;
    }

    .actions {
        flex-direction: column;
        gap: 10px;
    }

    .actions > div {
        display: flex;
        flex-direction: column;
        gap: 5px;
        width: 100%;
    }

    /* テーブルをカード形式に変更 */
    table {
        font-size: 14px;
    }

    table thead {
        display: none;
    }

    table tbody {
        display: block;
    }

    table tr {
        display: block;
        margin-bottom: 15px;
        border: 1px solid #ddd;
        border-radius: 8px;
        padding: 10px;
        background: white;
    }

    table td {
        display: block;
        text-align: left;
        padding: 8px 10px;
        border-bottom: 1px solid #f0f0f0;
        position: relative;
        padding-left: 45%;
    }

    table td:last-child {
        border-bottom: none;
    }

    table td:before {
        content: attr(data-label);
        position: absolute;
        left: 10px;
        font-weight: bold;
        color: #2c3e50;
    }

    /* 明細テーブルは通常表示を維持 */
    .items-table table thead {
        display: table-header-group;
    }

    .items-table table tbody {
        display: table-row-group;
    }

    .items-table table tr {
        display: table-row;
        margin-bottom: 0;
        border: none;
        padding: 0;
    }

    .items-table table td {
        display: table-cell;
        padding: 8px 4px;
        padding-left: 4px;
    }

    .items-table table td:before {
        content: none;
    }

    .items-table input {
        padding: 6px;
        font-size: 12px;
    }

    .total-row {
        font-size: 14px;
        gap: 10px;
    }

    .total-row.grand-total {
        font-size: 18px;
    }

    .form-group input,
    .form-group textarea,
    .form-group select {
        font-size: 16px; /* iOS のズーム防止 */
    }

    .empty-state {
        padding: 40px 15px;
    }

    .empty-state p {
        font-size: 16px;
    }
}

/* 小さいスマートフォン対応 */
@media (max-width: 480px) {
    header h1 {
        font-size: 18px;
    }

    nav ul {
        flex-direction: column;
        align-items: center;
    }

    nav a {
        display: block;
        width: 200px;
        text-align: center;
    }

    .dashboard-card h2 {
        font-size: 16px;
    }

    .items-table {
        overflow-x: auto;
    }

    .items-table table {
        min-width: 500px;
    }

    table td {
        padding-left: 40%;
        font-size: 13px;
    }
}

/* 備考欄スタイル */
.note-toggle {
    width: 24px;
    height: 24px;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 14px;
    color: #666;
    transition: transform 0.3s ease, color 0.3s ease;
    flex-shrink: 0;
}

.note-toggle:hover {
    color: #333;
}

.note-toggle.open {
    transform: rotate(180deg);
}

/* 備考がある場合（▼マーク）の色 */
.note-toggle.has-content:not(.open) {
    color: #3498db;
    font-weight: bold;
}

.item-note-row {
    background-color: #f8f9fa;
}

.item-note-container {
    padding: 8px 12px;
    border-left: 3px solid #3498db;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
    }
    to {
        opacity: 1;
        max-height: 200px;
    }
}

.note-header {
    font-size: 13px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 5px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.item-note {
    width: 100%;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 6px;
    font-family: inherit;
    font-size: 14px;
    resize: vertical;
    min-height: 50px;
    line-height: 1.5;
}

.item-note:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.1);
}

.item-note::placeholder {
    color: #999;
}

/* アコーディオンスタイル */
.accordion-section {
    margin-bottom: 12px;
}

.accordion-header {
    padding: 6px 5px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s ease;
}

.accordion-header:hover {
    opacity: 0.9;
}

.accordion-icon {
    font-size: 14px;
    transition: transform 0.3s ease;
    user-select: none;
}

.accordion-content {
    overflow: hidden;
    transition: max-height 0.3s ease;
}