/* ============================================
    세계 시간 차이 계산기 - style.css
    pastel sky blue theme (caboojoy-calculators)
    ============================================ */

    *, *::before, *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }
    
    body {
        font-family: 'Pretendard', 'Apple SD Gothic Neo', 'Noto Sans KR', sans-serif;
        background: linear-gradient(135deg, #c9e8ff 0%, #f0faff 100%);
        min-height: 100vh;
        padding: 2rem 1rem;
        color: #1a2f3e;
    }
    
    /* ── 레이아웃 ── */
    .wt-wrap {
        max-width: 680px;
        margin: 0 auto;
    }
    
    /* ── 헤더 ── */
    .wt-header {
        margin-bottom: 1.5rem;
        text-align: center;
    }
    
    .wt-title {
        font-size: 22px;
        font-weight: 700;
        color: #1a2f3e;
        margin-bottom: 4px;
    }
    
    .wt-sub {
        font-size: 14px;
        color: #5a7a8a;
    }
    
    /* ── 기준 도시 카드 ── */
    .wt-base-card {
        background: rgba(255, 255, 255, 0.85);
        backdrop-filter: blur(8px);
        border: 1px solid rgba(145, 200, 230, 0.5);
        border-radius: 16px;
        padding: 1.25rem 1.5rem;
        margin-bottom: 1rem;
        box-shadow: 0 4px 20px rgba(100, 160, 200, 0.15);
    }
    
    .wt-base-label {
        font-size: 11px;
        font-weight: 600;
        color: #5a7a8a;
        text-transform: uppercase;
        letter-spacing: 0.08em;
        margin-bottom: 0.75rem;
    }
    
    .wt-base-top {
        display: flex;
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 8px;
        margin-bottom: 0.75rem;
    }
    
    .wt-base-city {
        font-size: 18px;
        font-weight: 700;
        color: #1a2f3e;
    }
    
    .wt-base-date {
        font-size: 13px;
        color: #5a7a8a;
        margin-top: 2px;
    }
    
    .wt-base-time {
        font-size: 40px;
        font-weight: 700;
        color: #1a6fa8;
        letter-spacing: -2px;
        line-height: 1;
        font-variant-numeric: tabular-nums;
    }
    
    /* ── 공통 Select ── */
    .wt-select {
        flex: 1;
        height: 40px;
        border: 1px solid rgba(145, 200, 230, 0.6);
        border-radius: 10px;
        background: rgba(255, 255, 255, 0.7);
        color: #1a2f3e;
        font-size: 14px;
        padding: 0 12px;
        cursor: pointer;
        outline: none;
        transition: border-color 0.2s;
    }
    
    .wt-select:hover,
    .wt-select:focus {
        border-color: #5aade0;
    }
    
    .wt-base-select {
        display: flex;
        gap: 8px;
        align-items: center;
    }
    
    /* ── 비교 도시 카드 ── */
    .wt-cities {
        display: flex;
        flex-direction: column;
        gap: 8px;
        margin-bottom: 0;
    }
    
    .wt-city-card {
        background: rgba(255, 255, 255, 0.75);
        backdrop-filter: blur(6px);
        border: 1px solid rgba(145, 200, 230, 0.4);
        border-radius: 14px;
        padding: 1rem 1.25rem;
        display: flex;
        align-items: center;
        gap: 12px;
        transition: box-shadow 0.2s, border-color 0.2s;
    }
    
    .wt-city-card:hover {
        box-shadow: 0 4px 16px rgba(100, 160, 200, 0.2);
        border-color: rgba(90, 173, 224, 0.5);
    }
    
    .wt-city-main {
        flex: 1;
        min-width: 0;
    }
    
    .wt-city-row {
        display: flex;
        align-items: center;
        gap: 8px;
        flex-wrap: wrap;
        margin-bottom: 4px;
    }
    
    .wt-city-name {
        font-size: 15px;
        font-weight: 600;
        color: #1a2f3e;
    }
    
    .wt-city-tz {
        font-size: 12px;
        color: #7a9aaa;
    }
    
    .wt-city-time {
        font-size: 24px;
        font-weight: 700;
        color: #1a6fa8;
        letter-spacing: -0.5px;
        line-height: 1;
        font-variant-numeric: tabular-nums;
    }
    
    .wt-city-date {
        font-size: 12px;
        color: #5a7a8a;
        margin-top: 2px;
    }
    
    /* ── 시차 배지 ── */
    .wt-diff-badge {
        font-size: 12px;
        font-weight: 600;
        padding: 3px 10px;
        border-radius: 20px;
        white-space: nowrap;
    }
    
    .diff-pos {
        background: #d4f0e8;
        color: #0f6e56;
    }
    
    .diff-neg {
        background: #fde8e8;
        color: #b03030;
    }
    
    .diff-zero {
        background: #e8f4fb;
        color: #3a7a9a;
    }
    
    /* ── 삭제 버튼 ── */
    .wt-remove {
        width: 30px;
        height: 30px;
        border: 1px solid rgba(145, 200, 230, 0.5);
        border-radius: 8px;
        background: transparent;
        color: #7a9aaa;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 14px;
        flex-shrink: 0;
        transition: all 0.15s;
    }
    
    .wt-remove:hover {
        background: #fde8e8;
        color: #b03030;
        border-color: #f0b0b0;
    }
    
    /* ── 도시 추가 행 ── */
    .wt-add-row {
        display: flex;
        gap: 8px;
        margin-top: 1rem;
        margin-bottom: 0;
    }
    
    .wt-add-btn {
    height: 40px;
        padding: 0 18px;
        border: 1px solid rgba(90, 173, 224, 0.6);
        border-radius: 10px;
        background: rgba(201, 232, 255, 0.5);
        color: #1a6fa8;
        font-size: 14px;
        font-weight: 600;
        cursor: pointer;
        white-space: nowrap;
        transition: all 0.15s;
    }
    
    .wt-add-btn:hover {
        background: rgba(90, 173, 224, 0.25);
        border-color: #5aade0;
    }
    
    .wt-add-btn:active {
        transform: scale(0.98);
    }
    
    /* ── 시차 요약 테이블 ── */
    .wt-diff-table {
        background: rgba(255, 255, 255, 0.8);
        backdrop-filter: blur(6px);
        border: 1px solid rgba(145, 200, 230, 0.4);
        border-radius: 14px;
        margin-top: 1.25rem;
        overflow: hidden;
    }
    
    .wt-diff-table-title {
        font-size: 13px;
        font-weight: 600;
        color: #5a7a8a;
        padding: 0.875rem 1.25rem;
        border-bottom: 1px solid rgba(145, 200, 230, 0.3);
        background: rgba(201, 232, 255, 0.2);
    }
    
    .wt-diff-table table {
        width: 100%;
        border-collapse: collapse;
    }
    
    .wt-diff-cell {
        padding: 10px 1.25rem;
        font-size: 13px;
        color: #1a2f3e;
        border-bottom: 1px solid rgba(145, 200, 230, 0.2);
    }
    
    .wt-diff-cell:last-child,
    tr:last-child .wt-diff-cell {
        border-bottom: none;
    }
    
    .wt-diff-header {
        font-size: 12px;
        font-weight: 600;
        color: #5a7a8a;
        background: rgba(201, 232, 255, 0.15);
    }
    
    /* ── 업무 시간 타임라인 ── */
    .wt-overlap {
        background: rgba(255, 255, 255, 0.8);
        backdrop-filter: blur(6px);
        border: 1px solid rgba(145, 200, 230, 0.4);
        border-radius: 14px;
        margin-top: 1.25rem;
        padding: 1rem 1.25rem 1.25rem;
    }
    
    .wt-overlap-title {
        font-size: 13px;
        font-weight: 600;
        color: #5a7a8a;
        margin-bottom: 1rem;
    }
    
    .wt-city-tl {
        margin-bottom: 10px;
    }
    
    .wt-city-tl-label {
        font-size: 12px;
        font-weight: 500;
        color: #3a6a8a;
        margin-bottom: 4px;
    }
    
    .wt-timeline {
        display: flex;
        gap: 2px;
    }
    
    .wt-hour-cell {
        flex: 1;
        height: 18px;
        border-radius: 3px;
        min-width: 0;
        transition: opacity 0.2s;
    }
    
    .wt-hour-cell:hover {
        opacity: 0.7 !important;
    }
    
    .wt-timeline-label {
        display: flex;
        justify-content: space-between;
        font-size: 11px;
        color: #7a9aaa;
        margin-top: 6px;
    }
    
    /* ── 반응형 ── */
    @media (max-width: 480px) {
        body {
        padding: 1rem 0.75rem;
        }
    
        .wt-base-time {
        font-size: 30px;
        }
    
        .wt-city-time {
        font-size: 20px;
        }
    
        .wt-add-row {
        flex-direction: column;
        }

    .wt-base-select .wt-select,
    .wt-add-row .wt-select,
    .wt-add-btn {
    height: 40px;
    min-height: 40px;
    max-height: 40px;
    }
    
        .wt-add-btn {
        width: 100%;
        }
    }