/* ==========================================================================
   文本对比工具 - 紧凑现代主题
   命名前缀: .td-*
   ========================================================================== */

.td-page-header { margin-bottom: 16px; }
.td-page-title {
    font: 700 28px/1.2 var(--yst-font);
    letter-spacing: var(--yst-letter-spacing);
    color: var(--yst-text);
    margin: 0 0 8px;
}
.td-page-desc {
    font-size: 14px;
    color: var(--yst-text-2);
    margin: 0 0 14px;
}
.td-feature-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.td-tag {
    display: inline-flex;
    align-items: center;
    height: 22px;
    padding: 0 9px;
    background: var(--yst-bg-subtle);
    border: 1px solid var(--yst-border);
    border-radius: 5px;
    color: var(--yst-text-muted);
    font: 600 11px/1 var(--yst-font-mono, "SF Mono", monospace);
    letter-spacing: 0.5px;
    text-transform: lowercase;
}

/* 工具栏 */
.td-toolbar-card {
    padding: 12px 16px;
    margin-bottom: 14px;
}
.td-toolbar-row {
    display: flex;
    align-items: center;
}
.td-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}
.td-actions-divider {
    width: 1px;
    height: 22px;
    background: var(--yst-border);
    margin: 0 4px;
}
.td-upload {
    cursor: pointer;
    display: inline-flex;
    align-items: center;
}
.td-btn-danger {
    color: var(--yst-danger, #dc2626) !important;
    border-color: rgba(220, 38, 38, 0.3) !important;
}
.td-btn-danger:hover {
    background: rgba(220, 38, 38, 0.08) !important;
    color: var(--yst-danger, #dc2626) !important;
    border-color: var(--yst-danger, #dc2626) !important;
}

/* 左右两栏 */
.td-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 14px;
}
@media (max-width: 1023px) {
    .td-split { grid-template-columns: 1fr; }
}

.td-card { padding: 18px 20px; }
.td-pane {
    display: flex;
    flex-direction: column;
}

.td-section-header {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px dashed var(--yst-border);
}
.td-section-label {
    font: 700 14px var(--yst-font);
    color: var(--yst-text);
    letter-spacing: var(--yst-letter-spacing);
}
.td-section-desc {
    font-size: 12px;
    color: var(--yst-text-muted);
}

/* 编辑器 */
.td-editor-wrap {
    position: relative;
    display: flex;
    background: #fafafa;
    border: 1.5px solid var(--yst-border);
    border-radius: 8px;
    overflow: hidden;
    flex: 1;
    transition: border-color .15s, box-shadow .15s;
}
.td-editor-wrap:focus-within {
    border-color: var(--yst-brand);
    box-shadow: 0 0 0 3px rgba(0, 158, 148, 0.12);
}
.td-line-numbers {
    flex-shrink: 0;
    width: 44px;
    padding: 12px 0;
    background: #f0f4f4;
    border-right: 1px solid var(--yst-border);
    font: 13px/1.6 var(--yst-font-mono, "SF Mono", monospace);
    color: var(--yst-text-light);
    text-align: right;
    user-select: none;
    overflow: hidden;
}
.td-line-numbers > div {
    padding: 0 8px 0 0;
}
.td-editor {
    flex: 1;
    width: 100%;
    min-height: 380px;
    max-height: 70vh;
    padding: 12px 14px;
    border: none;
    outline: none;
    background: transparent;
    color: var(--yst-text);
    font: 13px/1.6 var(--yst-font-mono, "SF Mono", monospace);
    overflow-y: auto;
    white-space: pre-wrap;
    word-break: break-all;
    tab-size: 4;
}

/* 对比高亮 - 同时支持工具脚本注入的旧 class 名 */
.td-editor .added,
.text-content .added {
    background: rgba(34, 197, 94, 0.18);
    color: #15803d;
}
.td-editor .removed,
.text-content .removed {
    background: rgba(220, 38, 38, 0.16);
    color: #b91c1c;
    text-decoration: line-through;
}
.td-editor .modified,
.text-content .modified {
    background: rgba(245, 158, 11, 0.18);
    color: #b45309;
}

/* 信息卡 */
.td-info { padding: 18px 22px; margin-bottom: 14px; }
.td-feature h3 {
    font: 700 14px/1.4 var(--yst-font);
    color: var(--yst-text);
    margin: 0 0 6px;
    position: relative;
    padding-left: 12px;
}
.td-feature h3::before {
    content: "";
    position: absolute;
    left: 0; top: 5px; bottom: 5px;
    width: 3px;
    background: var(--yst-brand);
    border-radius: 0 2px 2px 0;
}
.td-feature p {
    font: 13px/1.6 var(--yst-font);
    color: var(--yst-text-2);
    margin: 0;
}

/* 移动端 */
@media (max-width: 768px) {
    .td-page-title { font-size: 22px; }
    .td-card, .td-info, .td-toolbar-card { padding: 14px 14px; }
    .td-line-numbers { width: 36px; }
    .td-editor { min-height: 280px; font-size: 12px; }
}