/* リセットと基本スタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', 'Meiryo', sans-serif;
    font-size: 14px;
    color: #333;
    background-color: #f5f5f5;
    min-height: 100vh;
}

#app {
    min-height: 100vh;
    padding: 16px;
    padding-top: 80px;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

/* タイトル */
h1 {
    font-size: 22px;
    color: #0891b2;
    margin-bottom: 4px;
}

.subtitle {
    color: #666;
    font-size: 14px;
    margin-bottom: 20px;
}

/* タブ */
.tabs {
    display: flex;
    border-bottom: 2px solid #e0e0e0;
    margin-bottom: 16px;
}

.tab-btn {
    flex: 1;
    padding: 12px 8px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: #666;
    transition: all 0.2s;
}

.tab-btn:hover {
    color: #0891b2;
}

.tab-btn.active {
    color: #0891b2;
    border-bottom-color: #0891b2;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* パネル */
.panel {
    margin-bottom: 16px;
    padding: 16px;
    background-color: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
}

.panel h2 {
    font-size: 14px;
    margin-bottom: 16px;
    color: #555;
    padding-bottom: 8px;
    border-bottom: 1px solid #eee;
}

.result-panel {
    background-color: #f0fdfa;
    border-color: #99f6e4;
}

.result-panel h2 {
    color: #0e7490;
    border-bottom-color: #99f6e4;
}

/* フォーム */
.form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block;
    margin-bottom: 4px;
    font-size: 13px;
    color: #555;
    font-weight: 500;
}

.form-row {
    display: flex;
    gap: 12px;
}

.form-row .form-group {
    flex: 1;
}

input[type="date"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 14px;
    font-family: 'Consolas', 'Monaco', 'Meiryo', monospace;
    background-color: #fff;
}

textarea {
    resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: #0891b2;
    box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.1);
}

/* ボタン */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background-color: #0891b2;
    color: #fff;
}

.btn-primary:hover {
    background-color: #0e7490;
}

.btn-secondary {
    background-color: #64748b;
    color: #fff;
}

.btn-secondary:hover:not(:disabled) {
    background-color: #475569;
}

.btn-secondary:disabled {
    background-color: #cbd5e1;
    cursor: not-allowed;
}

.btn-full {
    width: 100%;
}

.button-row {
    display: flex;
    gap: 8px;
}

.button-row .btn {
    flex: 1;
}

/* 結果表示（グリッド） */
.result-grid-display {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 8px 16px;
    font-size: 14px;
}

.result-grid-display .placeholder {
    grid-column: 1 / -1;
    color: #999;
    font-style: italic;
    text-align: center;
    padding: 20px;
}

.result-grid-display .label {
    color: #666;
    font-weight: 500;
}

.result-grid-display .value {
    font-family: 'Consolas', 'Monaco', monospace;
    color: #0e7490;
    font-weight: 600;
}

.result-grid-display .value.large {
    font-size: 20px;
}

.result-grid-display .separator {
    grid-column: 1 / -1;
    height: 1px;
    background-color: #e0e0e0;
    margin: 4px 0;
}

/* 結果エリア（一括変換用） */
.result-panel-inner {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid #eee;
}

.result-panel-inner h3 {
    font-size: 13px;
    color: #0e7490;
    margin-bottom: 8px;
}

.result-area {
    min-height: 80px;
    padding: 12px;
    background-color: #f0fdfa;
    border: 1px solid #99f6e4;
    border-radius: 6px;
    margin-bottom: 12px;
    font-family: 'Consolas', 'Monaco', 'Meiryo', monospace;
    font-size: 13px;
    line-height: 1.8;
    white-space: pre-wrap;
    word-break: break-all;
}

.result-area .placeholder {
    color: #999;
    font-style: italic;
}

.result-area .result-line {
    padding: 4px 0;
    border-bottom: 1px dashed #ccece6;
}

.result-area .result-line:last-child {
    border-bottom: none;
}

.result-area .error {
    color: #dc2626;
}

/* 使い方セクション */
.usage-section {
    margin-top: 24px;
    margin-bottom: 24px;
}

.usage-section summary {
    padding: 12px 16px;
    background-color: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    color: #555;
}

.usage-section summary:hover {
    background-color: #fafafa;
}

.usage-section[open] summary {
    border-radius: 8px 8px 0 0;
    border-bottom: none;
}

.usage-content {
    padding: 16px;
    background-color: #fff;
    border: 1px solid #e0e0e0;
    border-top: none;
    border-radius: 0 0 8px 8px;
}

.usage-content h3 {
    font-size: 14px;
    color: #0891b2;
    margin: 16px 0 8px 0;
}

.usage-content h3:first-child {
    margin-top: 0;
}

.usage-content p,
.usage-content ul {
    margin-bottom: 12px;
    color: #555;
}

.usage-content ul {
    margin-left: 20px;
}

.usage-content li {
    margin-bottom: 4px;
}

.usage-content code {
    background-color: #f1f5f9;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    color: #0e7490;
}

/* レスポンシブ */
@media (max-width: 480px) {
    #app {
        padding: 12px;
        padding-top: 72px;
    }

    h1 {
        font-size: 20px;
    }

    .tab-btn {
        font-size: 13px;
        padding: 10px 6px;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .panel {
        padding: 12px;
    }

    .button-row {
        flex-direction: column;
    }
}