.timestamp-workspace {
    display: flex;
    gap: 18px;
    max-width: var(--container);
    margin: 0 auto;
    padding: 26px 20px;
    align-items: stretch;
}

/* ── 卡片 ───────────────────────────────── */
.ts-card {
    position: relative;
    flex: 1;
    min-width: 0;
    background: var(--pane-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.ts-card:hover {
    border-color: var(--border-strong);
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 10px 28px rgba(14, 165, 233, 0.14);
}

/* 卡片顶部霓虹条 */
.ts-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary), var(--accent), transparent);
}

.ts-card-header {
    position: relative;
    padding: 13px 18px 13px 30px;
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font-mono);
    letter-spacing: 0.6px;
    color: var(--text);
    background: var(--subtle-bg);
    border-bottom: 1px solid var(--border);
}

.ts-card-header::before {
    content: "";
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 2px rgba(14, 165, 233, 0.2);
}

.ts-card-body {
    padding: 20px 18px;
}

/* 卡片纵向撑满，两栏底部对齐 */
.ts-card {
    display: flex;
    flex-direction: column;
}

.ts-card-body {
    flex: 1;
}

/* ── 表单 ───────────────────────────────── */
.ts-form-row {
    display: flex;
    gap: 16px;
    align-items: flex-end;
}

.ts-field {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.ts-field-unit {
    flex: 0 0 140px;
}

.ts-label {
    font-size: 12px;
    font-family: var(--font-mono);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--text-mute);
}

.ts-input,
.ts-select {
    width: 100%;
    height: 40px;
    padding: 0 13px;
    font-size: 14px;
    font-family: var(--font-mono);
    color: var(--text);
    background: var(--pane-bg-solid);
    border: 1px solid var(--border);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.ts-input::placeholder {
    color: var(--text-mute);
}

.ts-input:hover,
.ts-select:hover {
    border-color: var(--border-strong);
}

.ts-input:focus,
.ts-select:focus {
    border-color: var(--primary);
    box-shadow: var(--ring);
}

.ts-action-row {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 18px;
}

/* ── 主按钮 ─────────────────────────────── */
.btn-convert {
    position: relative;
    min-width: 96px;
    height: 40px;
    padding: 0 24px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--btn-fg);
    background: linear-gradient(135deg, var(--primary-lift) 0%, var(--primary) 50%, var(--primary-deep) 100%);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    overflow: hidden;
    box-shadow: 0 3px 12px rgba(14, 165, 233, 0.35);
    transition: box-shadow 0.2s ease, transform 0.12s ease, filter 0.2s ease;
}

/* 按钮扫光 */
.btn-convert::after {
    content: "";
    position: absolute;
    top: 0;
    left: -60%;
    width: 40%;
    height: 100%;
    background: linear-gradient(90deg, transparent, var(--shine), transparent);
    transform: skewX(-20deg);
    transition: left 0.55s ease;
}

.btn-convert:hover {
    filter: brightness(1.08);
    box-shadow: 0 6px 20px rgba(14, 165, 233, 0.45);
}

.btn-convert:hover::after {
    left: 120%;
}

.btn-convert:active {
    transform: translateY(1px);
    box-shadow: 0 2px 8px rgba(14, 165, 233, 0.35);
}

/* ── 当前时间胶囊 ───────────────────────── */
.ts-current {
    font-size: 12px;
    font-family: var(--font-mono);
    color: var(--text-mute);
    padding: 9px 13px;
    background: var(--pane-bg-solid);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.ts-current strong {
    color: var(--primary-ink);
    font-weight: 600;
    font-family: var(--font-mono);
}

.ts-current-clickable {
    cursor: pointer;
    user-select: none;
    transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.ts-current-clickable:hover {
    border-color: var(--border-strong);
    background: var(--surface);
    box-shadow: var(--glow-soft);
}

.ts-current-clickable:active {
    transform: translateY(1px);
}

/* ── 结果 / 错误 ─────────────────────────── */
.ts-result {
    position: relative;
    margin-top: 18px;
    padding: 14px 16px;
    background: rgba(5, 150, 105, 0.06);
    border: 1px solid rgba(5, 150, 105, 0.28);
    border-radius: var(--radius);
    animation: result-in 0.28s ease;
}

@keyframes result-in {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}

.ts-result-label {
    display: block;
    font-size: 11px;
    font-family: var(--font-mono);
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: var(--success-ink);
    margin-bottom: 6px;
}

.ts-result-value {
    display: block;
    font-size: 17px;
    font-family: var(--font-mono);
    color: var(--text);
    word-break: break-all;
}

.ts-error {
    margin-top: 14px;
    padding: 11px 14px;
    font-size: 13px;
    font-family: var(--font-mono);
    color: var(--error-text);
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    border-radius: 8px;
    animation: result-in 0.28s ease;
}

@media (max-width: 768px) {
    .timestamp-workspace {
        flex-direction: column;
        padding: 16px;
    }

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

    .ts-field-unit {
        flex: 1;
    }

    .ts-action-row {
        flex-wrap: wrap;
    }
}

@media (prefers-reduced-motion: reduce) {
    .ts-result,
    .ts-error {
        animation: none;
    }

    .btn-convert::after {
        display: none;
    }
}

/* ── 自定义下拉框 ─────────────────────────
   原生 select 的弹层由系统渲染、无法用 CSS 定制，
   故用 select.js 增强为 listbox；未增强时下面的 .ts-select 样式仍生效。 */
.cs {
    position: relative;
    width: 100%;
}

/* 增强成功后隐藏原生控件，但保留在 DOM 中持有真实值 */
.cs-native {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
    pointer-events: none;
}

.cs-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    width: 100%;
    height: 40px;
    padding: 0 12px 0 13px;
    font-size: 14px;
    font-family: var(--font-mono);
    text-align: left;
    color: var(--text);
    background: var(--pane-bg-solid);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    outline: none;
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.cs-trigger:hover {
    border-color: var(--border-strong);
}

.cs-trigger:focus-visible,
.cs-open .cs-trigger {
    border-color: var(--primary);
    box-shadow: var(--ring);
}

.cs-value {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 箭头：纯 CSS 绘制，展开时翻转 */
.cs-caret {
    flex: none;
    width: 9px;
    height: 9px;
    margin-top: -3px;
    border-right: 2px solid var(--text-mute);
    border-bottom: 2px solid var(--text-mute);
    border-radius: 1px;
    transform: rotate(45deg);
    transition: transform 0.22s ease, border-color 0.18s ease;
}

.cs-trigger:hover .cs-caret {
    border-color: var(--primary-ink);
}

.cs-open .cs-caret {
    transform: rotate(-135deg);
    margin-top: 2px;
    border-color: var(--primary);
}

/* 弹层：fixed 定位，避免被 .ts-card 的 overflow: hidden 裁掉 */
.cs-panel {
    position: fixed;
    z-index: 9000;
    max-height: 260px;
    margin: 0;
    padding: 5px;
    overflow-y: auto;
    list-style: none;
    background: var(--pane-bg-solid);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.14), 0 0 0 1px rgba(14, 165, 233, 0.08);
    animation: cs-in 0.16s ease;
    transform-origin: top center;
}

.cs-panel.cs-panel-up {
    transform-origin: bottom center;
}

@keyframes cs-in {
    from { opacity: 0; transform: translateY(-4px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.cs-option {
    position: relative;
    display: flex;
    align-items: center;
    height: 36px;
    padding: 0 32px 0 12px;
    font-size: 14px;
    font-family: var(--font-mono);
    color: var(--text-dim);
    border-radius: 7px;
    cursor: pointer;
    user-select: none;
}

.cs-option.is-active {
    color: var(--text);
    background: var(--surface-hover);
}

.cs-option[aria-selected="true"] {
    color: var(--primary-ink);
    font-weight: 600;
}

/* 选中项打勾：用两条边框拼出对勾，无需图标资源 */
.cs-option[aria-selected="true"]::after {
    content: "";
    position: absolute;
    right: 13px;
    top: 50%;
    width: 5px;
    height: 9px;
    margin-top: -6px;
    border-right: 2px solid var(--primary);
    border-bottom: 2px solid var(--primary);
    transform: rotate(45deg);
}

.cs-option[aria-disabled="true"] {
    color: var(--text-mute);
    cursor: not-allowed;
}

@media (prefers-reduced-motion: reduce) {
    .cs-panel {
        animation: none;
    }
}

/* 深色下卡片投影要更深，浅色投影在深底上等于没有 */
[data-theme="dark"] .ts-card {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

[data-theme="dark"] .ts-card:hover {
    box-shadow: 0 12px 44px rgba(0, 0, 0, 0.45), 0 0 24px rgba(34, 211, 238, 0.1);
}

[data-theme="dark"] .ts-current strong {
    text-shadow: 0 0 12px rgba(34, 211, 238, 0.45);
}