/**
 * Append Mode Styles
 * 
 * 第二阶段追加模式的样式定义
 * 基于第一阶段的设计系统和优化架构
 * 
 * @version 2.0.0
 * @author Phase Two Implementation
 */

/* ==========================================================================
   追加模式容器
   ========================================================================== */

.append-mode-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--bg-color, #ffffff);
    color: var(--text-color, #333333);
    font-family: var(--font-family, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif);
}

/* ==========================================================================
   追加控制区域
   ========================================================================== */

.append-controls {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-color, #ffffff);
    border-bottom: 1px solid var(--border-color, #e1e5e9);
    padding: 12px 16px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(8px);
}

.append-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.append-toolbar .left-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.append-toolbar .right-status {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* ==========================================================================
   按钮样式
   ========================================================================== */

.append-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    user-select: none;
}

.append-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.append-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 主要按钮 */
.append-btn.primary {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.2);
}

.append-btn.primary:hover:not(:disabled) {
    background: linear-gradient(135deg, #2563eb, #1e40af);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(59, 130, 246, 0.3);
}

.append-btn.primary:active {
    transform: translateY(0);
}

/* 次要按钮 */
.append-btn.secondary {
    background: var(--bg-secondary, #f8fafc);
    color: var(--text-secondary, #64748b);
    border: 1px solid var(--border-color, #e2e8f0);
}

.append-btn.secondary:hover:not(:disabled) {
    background: var(--bg-hover, #f1f5f9);
    color: var(--text-primary, #334155);
    border-color: var(--border-hover, #cbd5e1);
}

/* 历史按钮 */
.history-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--border-color, #e2e8f0);
    border-radius: 4px;
    color: var(--text-secondary, #64748b);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.history-btn:hover {
    background: var(--bg-hover, #f8fafc);
    color: var(--text-primary, #334155);
}

/* 按钮图标 */
.btn-icon {
    font-size: 16px;
    line-height: 1;
}

.btn-text {
    font-weight: 500;
}

/* ==========================================================================
   状态指示器
   ========================================================================== */

.append-status {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: var(--text-secondary, #64748b);
}

.section-count {
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 500;
}

.append-indicator {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.append-indicator.idle {
    display: none;
}

.append-indicator.appending {
    background: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
}

.append-indicator.appending::before {
    content: '⏳';
    animation: pulse 1.5s ease-in-out infinite;
}

.append-indicator.error {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.append-indicator.error::before {
    content: '⚠️';
}

.append-indicator.success {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

.append-indicator.success::before {
    content: '✅';
}

/* ==========================================================================
   内容区域
   ========================================================================== */

.append-content-area {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    scroll-behavior: smooth;
}

/* ==========================================================================
   追加段落
   ========================================================================== */

.append-section {
    margin-bottom: 24px;
    border: 1px solid var(--border-color, #e2e8f0);
    border-radius: 8px;
    background: var(--bg-color, #ffffff);
    overflow: hidden;
    transition: all 0.3s ease;
    animation: slideInUp 0.3s ease-out;
}

.append-section:hover {
    border-color: var(--border-hover, #cbd5e1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.append-section:last-child {
    margin-bottom: 0;
}

/* 段落头部 */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-secondary, #f8fafc);
    border-bottom: 1px solid var(--border-color, #e2e8f0);
    font-size: 13px;
}

.section-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-id {
    font-weight: 600;
    color: var(--text-primary, #1e293b);
}

.section-time {
    color: var(--text-secondary, #64748b);
    font-family: var(--font-mono, 'SF Mono', Monaco, monospace);
}

.section-actions {
    display: flex;
    align-items: center;
    gap: 4px;
}

.section-action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: none;
    border-radius: 4px;
    background: transparent;
    color: var(--text-secondary, #64748b);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 14px;
}

.section-action-btn:hover {
    background: var(--bg-hover, #f1f5f9);
    color: var(--text-primary, #334155);
}

.section-action-btn:active {
    transform: scale(0.95);
}

/* 段落内容 */
.section-content {
    padding: 16px;
    line-height: 1.6;
}

.section-content.markdown-body {
    /* 继承第一阶段的markdown样式 */
    font-size: 14px;
}

.section-content.markdown-body h1,
.section-content.markdown-body h2,
.section-content.markdown-body h3 {
    margin-top: 0;
    margin-bottom: 12px;
}

.section-content.markdown-body p {
    margin-bottom: 12px;
}

.section-content.markdown-body pre {
    margin: 12px 0;
    padding: 12px;
    background: var(--code-bg, #f6f8fa);
    border-radius: 6px;
    overflow-x: auto;
}

.section-content.markdown-body code {
    background: var(--code-bg, #f6f8fa);
    padding: 2px 4px;
    border-radius: 3px;
    font-size: 13px;
}

.section-content.markdown-body blockquote {
    margin: 12px 0;
    padding: 8px 16px;
    border-left: 4px solid var(--accent-color, #3b82f6);
    background: rgba(59, 130, 246, 0.05);
    font-style: italic;
}

.section-content.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
}

.section-content.markdown-body th,
.section-content.markdown-body td {
    padding: 8px 12px;
    border: 1px solid var(--border-color, #e2e8f0);
    text-align: left;
}

.section-content.markdown-body th {
    background: var(--bg-secondary, #f8fafc);
    font-weight: 600;
}

/* ==========================================================================
   段落分隔符
   ========================================================================== */

.section-separator {
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        var(--border-color, #e2e8f0) 20%,
        var(--border-color, #e2e8f0) 80%,
        transparent
    );
    margin: 16px 0;
    position: relative;
}

.section-separator::before {
    content: '···';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-color, #ffffff);
    color: var(--text-secondary, #64748b);
    padding: 0 12px;
    font-size: 14px;
    letter-spacing: 4px;
}

/* ==========================================================================
   错误状态
   ========================================================================== */

.section-error {
    padding: 12px;
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 6px;
    margin: 8px 0;
}

.error-message {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #dc2626;
    font-size: 13px;
}

.error-icon {
    font-size: 16px;
}

.error-text {
    font-weight: 500;
}

/* ==========================================================================
   历史记录切换
   ========================================================================== */

.append-history-toggle {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border-color, #e2e8f0);
}

/* ==========================================================================
   响应式设计
   ========================================================================== */

@media (max-width: 768px) {
    .append-controls {
        padding: 8px 12px;
    }
    
    .append-toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }
    
    .append-toolbar .left-actions {
        justify-content: center;
    }
    
    .append-toolbar .right-status {
        justify-content: center;
        font-size: 12px;
    }
    
    .append-content-area {
        padding: 12px;
    }
    
    .append-section {
        margin-bottom: 16px;
    }
    
    .section-header {
        padding: 8px 12px;
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .section-actions {
        align-self: flex-end;
    }
    
    .section-content {
        padding: 12px;
    }
}

@media (max-width: 480px) {
    .append-btn {
        padding: 6px 12px;
        font-size: 13px;
    }
    
    .btn-text {
        display: none;
    }
    
    .section-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
}

/* ==========================================================================
   动画效果
   ========================================================================== */

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ==========================================================================
   深色模式支持
   ========================================================================== */

@media (prefers-color-scheme: dark) {
    .append-mode-container {
        --bg-color: #0f172a;
        --bg-secondary: #1e293b;
        --bg-hover: #334155;
        --text-color: #f1f5f9;
        --text-primary: #f1f5f9;
        --text-secondary: #94a3b8;
        --border-color: #334155;
        --border-hover: #475569;
        --code-bg: #1e293b;
        --accent-color: #60a5fa;
    }
    
    .append-btn.primary {
        background: linear-gradient(135deg, #2563eb, #1d4ed8);
    }
    
    .append-btn.primary:hover:not(:disabled) {
        background: linear-gradient(135deg, #3b82f6, #2563eb);
    }
    
    .append-section {
        background: var(--bg-color);
        border-color: var(--border-color);
    }
    
    .section-separator::before {
        background: var(--bg-color);
    }
}

/* ==========================================================================
   高对比度模式支持
   ========================================================================== */

@media (prefers-contrast: high) {
    .append-section {
        border-width: 2px;
    }
    
    .section-header {
        border-bottom-width: 2px;
    }
    
    .append-btn {
        border-width: 2px;
    }
    
    .append-btn.primary {
        background: #1d4ed8;
        border: 2px solid #1e40af;
    }
    
    .append-btn.secondary {
        border-width: 2px;
    }
}

/* ==========================================================================
   减少动画模式支持
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    .append-section {
        animation: none;
    }
    
    .append-btn,
    .section-action-btn,
    .history-btn {
        transition: none;
    }
    
    .append-indicator.appending::before {
        animation: none;
    }
    
    .append-content-area {
        scroll-behavior: auto;
    }
}

/* ==========================================================================
   打印样式
   ========================================================================== */

@media print {
    .append-controls,
    .section-actions,
    .append-history-toggle {
        display: none;
    }
    
    .append-section {
        border: 1px solid #000;
        margin-bottom: 20px;
        break-inside: avoid;
    }
    
    .section-content {
        color: #000;
    }
}