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

:root {
    --bg-app: #1e1e1e;
    --bg-pane: #252526;
    --bg-header: #333333;
    --text-primary: #d4d4d4;
    --text-secondary: #808080;
    --border: #3c3c3c;
    --accent: #0e639c;
    --accent-hover: #1177bb;
    --success: #4ec9b0;
}

body {
    font-family: 'Consolas', 'Monaco', monospace;
    background: var(--bg-app);
    color: var(--text-primary);
    min-height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border);
}

.header h1 {
    font-size: 1rem;
    font-weight: 500;
}

.btn-primary, .btn-secondary, .btn-copy {
    padding: 0.4rem 0.8rem;
    border: none;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

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

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

.btn-copy {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
}

.btn-copy:hover {
    background: var(--border);
    color: var(--text-primary);
}

.main-content {
    flex: 1;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* 現在時刻セクション */
.current-time-section, .convert-section, .quick-section {
    background: var(--bg-pane);
    border-radius: 6px;
}

/* クイック参照セクション */
.quick-buttons {
    display: flex;
    gap: 0.5rem;
    padding: 0.75rem;
    flex-wrap: wrap;
}

.quick-btn {
    padding: 0.4rem 0.75rem;
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.quick-btn:hover {
    background: var(--border);
    color: var(--text-primary);
}

.quick-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-radius: 6px 6px 0 0;
}

.current-time-content {
    padding: 0.75rem;
}

.time-row {
    display: flex;
    align-items: center;
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border);
}

.time-row:last-child {
    border-bottom: none;
}

.time-label {
    min-width: 120px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.time-value {
    font-size: 0.85rem;
    color: var(--success);
    font-family: inherit;
}

/* 変換セクション */
.convert-content {
    padding: 0.75rem;
}

.input-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.input-row input[type="text"] {
    flex: 1;
    min-width: 200px;
    padding: 0.5rem;
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
}

.input-row input::placeholder {
    color: var(--text-secondary);
}

.unit-toggle {
    display: flex;
    background: var(--bg-app);
    border-radius: 4px;
    overflow: hidden;
}

.unit-btn {
    padding: 0.5rem 0.75rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
}

.unit-btn.active {
    background: var(--accent);
    color: white;
}

/* 日時入力 */
.datetime-inputs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.datetime-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.datetime-row input[type="date"],
.datetime-row input[type="time"] {
    padding: 0.5rem;
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
}

.tz-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.tz-label select {
    padding: 0.4rem;
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.8rem;
}

/* 相対時間 */
.relative-inputs {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.relative-inputs input[type="number"] {
    width: 80px;
    padding: 0.5rem;
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    text-align: center;
}

.relative-inputs select {
    padding: 0.5rem;
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
}

/* 差分計算 */
.diff-inputs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.diff-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.diff-label {
    min-width: 50px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.diff-row input[type="text"] {
    flex: 1;
    padding: 0.5rem;
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
}

.diff-row input::placeholder {
    color: var(--text-secondary);
}

.diff-summary {
    font-size: 1rem;
    color: #dcdcaa;
    font-weight: 500;
    padding: 0.5rem;
    background: rgba(220, 220, 170, 0.1);
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

/* 結果ボックス */
.result-box {
    margin-top: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-app);
    border-radius: 4px;
    min-height: 60px;
}

.result-box:empty::before {
    content: '結果がここに表示されます';
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.result-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.3rem 0;
    border-bottom: 1px solid var(--border);
}

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

.result-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    min-width: 100px;
}

.result-value {
    flex: 1;
    font-size: 0.85rem;
    color: var(--success);
    word-break: break-all;
}

.result-copy {
    padding: 0.2rem 0.4rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 3px;
    color: var(--text-secondary);
    font-size: 0.65rem;
    cursor: pointer;
    margin-left: 0.5rem;
}

.result-copy:hover {
    background: var(--border);
    color: var(--text-primary);
}

/* フッター */
.footer {
    padding: 0.5rem 1rem;
    background: var(--bg-header);
    border-top: 1px solid var(--border);
    font-size: 0.7rem;
    color: var(--text-secondary);
}

/* トースト */
.toast {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    background: var(--success);
    color: var(--bg-app);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.2s;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* コードスニペット */
.code-snippets {
    margin-top: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-app);
    border-radius: 4px;
}

.snippet-header {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.snippet-tabs {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 0.5rem;
}

.snippet-tab {
    padding: 0.3rem 0.6rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 3px;
    color: var(--text-secondary);
    font-size: 0.7rem;
    cursor: pointer;
    transition: all 0.2s;
}

.snippet-tab:hover {
    background: var(--border);
    color: var(--text-primary);
}

.snippet-tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.code-output {
    padding: 0.5rem;
    background: var(--bg-pane);
    border-radius: 4px;
    font-size: 0.75rem;
    color: #dcdcaa;
    white-space: pre-wrap;
    word-break: break-all;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.btn-small {
    padding: 0.15rem 0.4rem;
    font-size: 0.65rem;
}

/* レスポンシブ */
@media (max-width: 600px) {
    .input-row {
        flex-direction: column;
        align-items: stretch;
    }

    .input-row input[type="text"] {
        min-width: auto;
    }

    .unit-toggle {
        align-self: flex-start;
    }

    .datetime-row {
        flex-direction: column;
        align-items: stretch;
    }

    .relative-inputs {
        flex-direction: column;
        align-items: stretch;
    }

    .relative-inputs input,
    .relative-inputs select {
        width: 100%;
    }
}