/* ===== 文本对比 Diff ===== */
: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);
}

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

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

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

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

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

.td-toolbar {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

/* ---------- 输入区 ---------- */
.td-input-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.td-input-box {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
}

.td-input-head {
    font-size: 12px;
    color: var(--text-tertiary);
    padding-left: 2px;
}

.td-input-head b {
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', Consolas, monospace;
}

.td-textarea {
    width: 100%;
    min-height: 230px;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-family: 'JetBrains Mono', Consolas, 'Microsoft YaHei', monospace;
    font-size: 13px;
    line-height: 1.7;
    outline: none;
    resize: vertical;
    tab-size: 4;
    transition: border-color .2s, box-shadow .2s;
}

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

.td-textarea.is-drag {
    border-color: var(--accent-color);
    background: color-mix(in srgb, var(--accent-color) 8%, var(--input-bg));
}

/* ---------- 选项 ---------- */
.td-options {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 18px;
}

.td-check {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}

.td-check input {
    width: 15px;
    height: 15px;
    accent-color: var(--accent-color);
    cursor: pointer;
}

.td-view-switch {
    display: inline-flex;
    border: 1px solid var(--border-color);
    border-radius: 9px;
    overflow: hidden;
    margin-left: auto;
}

.td-view-btn {
    border: 0;
    background: transparent;
    color: var(--text-secondary);
    font-size: 13px;
    padding: 7px 16px;
    cursor: pointer;
    transition: background .18s, color .18s;
}

.td-view-btn + .td-view-btn {
    border-left: 1px solid var(--border-color);
}

.td-view-btn.active {
    background: var(--accent-color);
    color: #fff;
}

/* ---------- 统计 ---------- */
.td-stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 10px;
}

.td-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 16px 10px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-hover);
    text-align: center;
}

.td-stat .num {
    font-size: 24px;
    font-weight: 800;
    font-family: 'JetBrains Mono', Consolas, monospace;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.td-stat--accent .num {
    color: var(--accent-color);
}

.td-stat .label {
    font-size: 12px;
    color: var(--text-tertiary);
}

/* ---------- 结果 ---------- */
.td-legend {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 10px;
    font-size: 12px;
    color: var(--text-tertiary);
}

.td-lg {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.td-lg--add::before,
.td-lg--del::before,
.td-lg--mod::before {
    content: '';
    width: 10px;
    height: 10px;
    border-radius: 3px;
    display: inline-block;
}

.td-lg--add::before { background: rgba(34, 197, 94, .75); }
.td-lg--del::before { background: rgba(239, 68, 68, .75); }
.td-lg--mod::before { background: rgba(245, 158, 11, .8); }

.td-diff {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    background: var(--input-bg);
    font-family: 'JetBrains Mono', Consolas, 'Microsoft YaHei', monospace;
    font-size: 12.5px;
    line-height: 1.75;
}

.td-empty {
    margin: 0;
    padding: 28px 16px;
    text-align: center;
    color: var(--text-tertiary);
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 13px;
}

.td-diff-head {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-hover);
}

.td-diff-head span {
    padding: 8px 12px;
    font-size: 12px;
    font-family: system-ui, -apple-system, sans-serif;
    color: var(--text-tertiary);
    border-left: 1px solid var(--border-color);
}

.td-diff-head span:first-child {
    border-left: 0;
}

.td-rows {
    max-height: 620px;
    overflow: auto;
}

.td-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-bottom: 1px solid color-mix(in srgb, var(--border-color) 55%, transparent);
}

.td-row:last-child {
    border-bottom: 0;
}

.td-diff[data-mode="unified"] .td-rows .td-row {
    grid-template-columns: minmax(0, 1fr);
}

.td-cell {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 1px 10px 1px 0;
    min-width: 0;
    border-left: 1px solid color-mix(in srgb, var(--border-color) 60%, transparent);
}

.td-cell:first-child {
    border-left: 0;
}

.td-diff[data-mode="unified"] .td-cell {
    border-left: 0;
}

.td-ln {
    flex: 0 0 auto;
    width: 42px;
    text-align: right;
    padding: 0 6px 0 0;
    color: var(--text-tertiary);
    opacity: .75;
    font-size: 11.5px;
    user-select: none;
    border-right: 1px solid color-mix(in srgb, var(--border-color) 60%, transparent);
}

.td-mark {
    flex: 0 0 auto;
    width: 12px;
    text-align: center;
    user-select: none;
    color: var(--text-tertiary);
}

.td-code {
    flex: 1 1 auto;
    min-width: 0;
    white-space: pre-wrap;
    word-break: break-word;
    color: var(--text-primary);
}

.td-code:empty::after {
    content: '\00a0';
}

/* 行类型配色 */
.td-cell--add { background: rgba(34, 197, 94, .12); }
.td-cell--del { background: rgba(239, 68, 68, .12); }
.td-cell--mod-add { background: rgba(245, 158, 11, .13); }
.td-cell--mod-del { background: rgba(245, 158, 11, .13); }
.td-cell--empty { background: color-mix(in srgb, var(--border-color) 14%, transparent); }

.td-cell--add .td-mark { color: #16a34a; font-weight: 700; }
.td-cell--del .td-mark { color: #dc2626; font-weight: 700; }
.td-cell--mod-add .td-mark,
.td-cell--mod-del .td-mark { color: #d97706; font-weight: 700; }

/* 行内高亮 */
.td-code del,
.td-code ins {
    text-decoration: none;
    border-radius: 3px;
    padding: 0 1px;
}

.td-code del {
    background: rgba(239, 68, 68, .3);
    color: inherit;
}

.td-code ins {
    background: rgba(34, 197, 94, .32);
    color: inherit;
}

.td-fold {
    grid-column: 1 / -1;
    padding: 5px 12px;
    text-align: center;
    font-size: 11.5px;
    font-family: system-ui, -apple-system, sans-serif;
    color: var(--text-tertiary);
    background: var(--bg-hover);
    border-bottom: 1px solid color-mix(in srgb, var(--border-color) 55%, transparent);
    letter-spacing: .3px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
    .td-input-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .td-textarea {
        min-height: 170px;
    }

    .td-view-switch {
        margin-left: 0;
    }

    .td-row,
    .td-diff-head {
        grid-template-columns: minmax(0, 1fr);
    }

    .td-diff[data-mode="side"] .td-row .td-cell {
        border-left: 0;
    }

    .td-diff[data-mode="side"] .td-row .td-cell--empty {
        display: none;
    }

    .td-ln {
        width: 34px;
    }
}