/* ===== 日期计算器 ===== */
:root {
    --card-bg: var(--c-bg-card);
    --border-color: var(--c-border);
    --text-primary: var(--c-text);
    --text-secondary: var(--c-text-sub);
    --text-tertiary: var(--c-text-muted);
    --bg-hover: var(--c-bg-soft);
    --input-bg: var(--c-surface-soft);
    --accent-color: var(--c-primary);
    --card-shadow: var(--shadow-md);
}

.dc-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin: 16px 0 20px;
}

.dc-title {
    font-size: 26px;
    font-weight: 800;
    margin: 0;
    letter-spacing: -0.3px;
}

.dc-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 18px;
    margin-bottom: 18px;
    box-shadow: var(--card-shadow);
}

.dc-block-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 17px;
    margin: 0 0 14px;
}

.dc-tip-inline {
    font-size: 12px;
    font-weight: 400;
    color: var(--text-tertiary);
}

.dc-tip {
    margin-top: 12px;
    font-size: 12.5px;
    color: var(--text-tertiary);
    line-height: 1.7;
}

.dc-row {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    flex-wrap: wrap;
}

.dc-row--wrap {
    align-items: flex-end;
}

.dc-row--top {
    align-items: flex-start;
}

.dc-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.dc-field--num {
    width: 140px;
}

.dc-field--grow {
    flex: 1;
    min-width: 220px;
}

.dc-label {
    font-size: 12.5px;
    color: var(--text-secondary);
}

.dc-input {
    height: 40px;
    padding: 0 12px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: border-color .2s, box-shadow .2s;
}

.dc-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-color) 18%, transparent);
}

.dc-input[type="number"] {
    font-family: 'JetBrains Mono', Consolas, monospace;
}

.dc-result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 10px;
    margin-top: 16px;
}

.dc-result-grid--3 {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.dc-result-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 12px 14px;
    border: 1px dashed var(--border-color);
    border-radius: 10px;
    background: var(--bg-hover);
}

.dc-result-item .k {
    font-size: 12px;
    color: var(--text-tertiary);
}

.dc-result-item .v {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    word-break: break-all;
    cursor: text;
    user-select: all;
}

.dc-result-item .v.dc-big {
    font-size: 22px;
    font-weight: 800;
    color: var(--accent-color);
    font-family: 'JetBrains Mono', Consolas, monospace;
}

.dc-quick {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.dc-quick-label {
    font-size: 12.5px;
    color: var(--text-secondary);
}

.dc-quick-btn {
    padding: 5px 12px;
    font-size: 13px;
}