/* ===== PPT 系统专用样式 - 完全复刻 Banana Slides ===== */

/* CSS 变量 */
:root {
    /* 主色 - 黄色系 (banana) */
    --banana-50: #FFF9E6;
    --banana-100: #FFE44D;
    --banana-500: #FFD700;
    --banana-600: #FFC700;
    --banana-yellow: #FFD700;
    --banana-yellow-light: #FFE44D;
    --banana-yellow-dark: #FFC700;
    --banana-yellow-pale: #FFF9E6;

    /* 中性色 */
    --ppt-black: #1A1A1A;
    --ppt-black-80: #4A4A4A;
    --ppt-black-60: #757575;
    --ppt-black-10: #F5F5F5;
    --ppt-white: #FFFFFF;

    /* 功能色 */
    --ppt-success: #52C41A;
    --ppt-warning: #FAAD14;
    --ppt-error: #FF4D4F;
    --ppt-info: #1890FF;

    /* 过渡 */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* 圆角 */
    --radius-card: 12px;
    --radius-panel: 16px;

    /* 阴影 */
    --shadow-yellow: 0 4px 12px rgba(255, 215, 0, 0.3);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

/* ===== 基础重置 ===== */
.ppt-app * {
    box-sizing: border-box;
}

.ppt-app {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: calc(100vh - 60px);
}

/* ===== 渐变背景 ===== */
.ppt-bg-gradient {
    background: linear-gradient(135deg,
        rgba(255, 249, 230, 1) 0%,
        rgba(255, 237, 213, 0.3) 50%,
        rgba(255, 228, 230, 0.5) 100%
    );
    position: relative;
    overflow: hidden;
}

.ppt-bg-gradient::before {
    content: '';
    position: absolute;
    top: -160px;
    right: -160px;
    width: 320px;
    height: 320px;
    background: rgba(255, 215, 0, 0.1);
    border-radius: 50%;
    filter: blur(60px);
    animation: pulse 4s ease-in-out infinite;
}

.ppt-bg-gradient::after {
    content: '';
    position: absolute;
    bottom: -160px;
    left: -160px;
    width: 384px;
    height: 384px;
    background: rgba(251, 146, 60, 0.1);
    border-radius: 50%;
    filter: blur(60px);
    animation: pulse 4s ease-in-out infinite 1s;
}

/* ===== 按钮样式 ===== */
.ppt-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    outline: none;
    white-space: nowrap;
}

.ppt-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.ppt-btn-primary {
    background: linear-gradient(135deg, var(--banana-500) 0%, var(--banana-600) 100%);
    color: var(--ppt-black);
    box-shadow: var(--shadow-yellow);
}

.ppt-btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(255, 215, 0, 0.4);
}

.ppt-btn-secondary {
    background: var(--ppt-white);
    color: var(--ppt-black-80);
    border: 1px solid #e5e7eb;
}

.ppt-btn-secondary:hover:not(:disabled) {
    background: var(--banana-50);
    border-color: var(--banana-500);
}

.ppt-btn-success {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(34, 197, 94, 0.3);
}

.ppt-btn-success:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.4);
}

.ppt-btn-ghost {
    background: transparent;
    color: var(--ppt-black-80);
}

.ppt-btn-ghost:hover:not(:disabled) {
    background: rgba(255, 215, 0, 0.1);
}

.ppt-btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.ppt-btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

/* ===== 卡片样式 ===== */
.ppt-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-panel);
    box-shadow: var(--shadow-2xl);
    border: none;
    padding: 40px;
    transition: all var(--transition-slow);
}

.ppt-card:hover {
    box-shadow: 0 35px 60px -12px rgba(0, 0, 0, 0.2);
}

/* ===== 标签页切换 ===== */
.ppt-tabs {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
}

.ppt-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--ppt-white);
    border: 1px solid #e5e7eb;
    color: var(--ppt-black-80);
}

.ppt-tab:hover {
    background: var(--banana-50);
}

.ppt-tab.active {
    background: linear-gradient(135deg, var(--banana-500) 0%, var(--banana-600) 100%);
    color: var(--ppt-black);
    border-color: transparent;
    box-shadow: var(--shadow-yellow);
}

.ppt-tab-icon {
    width: 20px;
    height: 20px;
}

/* ===== 输入框样式 ===== */
.ppt-input,
.ppt-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: all var(--transition-base);
    background: var(--ppt-white);
    color: var(--ppt-black);
}

.ppt-input:focus,
.ppt-textarea:focus {
    outline: none;
    border-color: var(--banana-500);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.2);
}

.ppt-textarea {
    resize: vertical;
    min-height: 120px;
    line-height: 1.6;
}

.ppt-textarea-lg {
    min-height: 200px;
}

.ppt-input::placeholder,
.ppt-textarea::placeholder {
    color: #9ca3af;
}

/* ===== 输入框包装器（带按钮） ===== */
.ppt-input-wrapper {
    position: relative;
}

.ppt-input-wrapper .ppt-textarea {
    padding-right: 120px;
    padding-bottom: 56px;
}

.ppt-input-wrapper .ppt-btn-submit {
    position: absolute;
    right: 12px;
    bottom: 12px;
}

.ppt-input-wrapper .ppt-btn-attach {
    position: absolute;
    left: 12px;
    bottom: 12px;
    padding: 8px;
    color: #9ca3af;
}

.ppt-input-wrapper .ppt-btn-attach:hover {
    color: var(--ppt-black-80);
    background: #f3f4f6;
}

/* ===== Hero 区域 ===== */
.ppt-hero {
    text-align: center;
    margin-bottom: 48px;
    padding-top: 32px;
}

.ppt-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(8px);
    border-radius: 999px;
    border: 1px solid rgba(255, 215, 0, 0.3);
    box-shadow: var(--shadow-sm);
    margin-bottom: 16px;
    font-size: 14px;
    color: var(--ppt-black-80);
}

.ppt-hero-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #ca8a04 0%, #ea580c 50%, #db2777 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% auto;
    animation: gradient 3s ease infinite;
}

.ppt-hero-subtitle {
    font-size: 18px;
    color: var(--ppt-black-60);
    margin-bottom: 24px;
}

.ppt-hero-tagline {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 28px;
    background: linear-gradient(135deg, #ca8a04 0%, #ea580c 50%, #db2777 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% auto;
    animation: gradient 3s ease infinite;
}

/* ===== 特性标签 ===== */
.ppt-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.ppt-feature-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(8px);
    border-radius: 999px;
    font-size: 13px;
    color: var(--ppt-black-80);
    border: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    cursor: default;
}

.ppt-feature-tag:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

/* ===== 提示文字 ===== */
.ppt-hint {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 24px;
    font-size: 14px;
    color: var(--ppt-black-60);
}

.ppt-hint-icon {
    color: var(--banana-600);
    flex-shrink: 0;
}

.ppt-hint-text {
    font-weight: 600;
}

/* ===== 模板选择器 ===== */
.ppt-template-section {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid #f3f4f6;
}

.ppt-template-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 600;
    color: var(--ppt-black);
    margin-bottom: 16px;
}

.ppt-template-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 12px;
}

.ppt-template-item {
    aspect-ratio: 16/9;
    border-radius: 8px;
    border: 2px solid transparent;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-base);
    background: #f3f4f6;
    position: relative;
}

.ppt-template-item:hover {
    border-color: var(--banana-500);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.ppt-template-item.selected {
    border-color: var(--banana-500);
    box-shadow: var(--shadow-yellow);
}

.ppt-template-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ppt-template-item-check {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 24px;
    height: 24px;
    background: var(--banana-500);
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    color: var(--ppt-black);
}

.ppt-template-item.selected .ppt-template-item-check {
    display: flex;
}

/* ===== 页面编辑器头部 ===== */
.ppt-header {
    background: var(--ppt-white);
    border-bottom: 1px solid #e5e7eb;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-shrink: 0;  /* 不收缩 */
    z-index: 100;
}

.ppt-header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.ppt-header-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
}

.ppt-header-logo-icon {
    font-size: 28px;
}

.ppt-header-divider {
    color: #d1d5db;
}

.ppt-header-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--ppt-black);
}

.ppt-header-center {
    flex: 1;
    max-width: 600px;
}

.ppt-header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ===== AI 输入框 ===== */
.ppt-ai-input {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    transition: all var(--transition-base);
}

.ppt-ai-input:focus-within {
    border-color: var(--banana-500);
    background: var(--ppt-white);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.1);
}

.ppt-ai-input input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 13px;
    outline: none;
}

.ppt-ai-input-icon {
    color: var(--banana-600);
}

/* ===== 上下文栏 ===== */
.ppt-context-bar {
    background: var(--banana-50);
    border-bottom: 1px solid rgba(255, 215, 0, 0.2);
    padding: 12px 24px;
    font-size: 13px;
    max-height: 80px;
    overflow-y: auto;
}

.ppt-context-label {
    font-weight: 500;
    color: var(--ppt-black-80);
    display: flex;
    align-items: center;
    gap: 4px;
}

.ppt-context-text {
    color: var(--ppt-black);
    margin-left: 8px;
    white-space: pre-wrap;
    word-break: break-word;
}

/* ===== 主内容区布局 ===== */
.ppt-main-layout {
    display: flex;
    min-height: calc(100vh - 180px);
}

.ppt-main-content {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
}

.ppt-main-sidebar {
    width: 380px;
    background: var(--ppt-white);
    border-left: 1px solid #e5e7eb;
    padding: 24px;
    overflow-y: auto;
    flex-shrink: 0;
}

/* ===== 大纲卡片 ===== */
.ppt-outline-card {
    background: var(--ppt-white);
    border: 1px solid #e5e7eb;
    border-radius: var(--radius-card);
    padding: 16px;
    margin-bottom: 16px;
    transition: all var(--transition-base);
    cursor: pointer;
}

.ppt-outline-card:hover {
    border-color: var(--banana-500);
    box-shadow: var(--shadow-md);
}

.ppt-outline-card.selected {
    border-color: var(--banana-500);
    background: var(--banana-50);
}

.ppt-outline-card.generating {
    opacity: 0.6;
    pointer-events: none;
}

.ppt-outline-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.ppt-outline-card-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--banana-500);
    color: var(--ppt-black);
    border-radius: 50%;
    font-size: 13px;
    font-weight: 600;
}

.ppt-outline-card-drag {
    color: #9ca3af;
    cursor: grab;
    padding: 4px;
}

.ppt-outline-card-drag:active {
    cursor: grabbing;
}

.ppt-outline-card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--ppt-black);
    margin-bottom: 8px;
}

.ppt-outline-card-title input {
    width: 100%;
    border: none;
    background: transparent;
    font-size: inherit;
    font-weight: inherit;
    color: inherit;
    outline: none;
    padding: 4px 0;
}

.ppt-outline-card-title input:focus {
    background: var(--banana-50);
    border-radius: 4px;
    padding: 4px 8px;
    margin: -4px -8px;
}

.ppt-outline-card-points {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ppt-outline-card-point {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 4px 0;
    font-size: 14px;
    color: var(--ppt-black-80);
}

.ppt-outline-card-point::before {
    content: '•';
    color: var(--banana-500);
    flex-shrink: 0;
}

.ppt-outline-card-point input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: inherit;
    color: inherit;
    outline: none;
}

.ppt-outline-card-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.ppt-outline-card:hover .ppt-outline-card-actions {
    opacity: 1;
}

/* 页码标签样式 */
.ppt-outline-card-page-label {
    display: flex;
    align-items: center;
    gap: 8px;
}

.ppt-outline-card-page-label .page-num {
    font-size: 14px;
    font-weight: 600;
    color: var(--ppt-black);
}

.ppt-outline-card-page-label .page-part {
    font-size: 12px;
    padding: 2px 8px;
    background: #e3f2fd;
    color: #1565c0;
    border-radius: 4px;
    font-weight: 500;
}

/* 编辑/删除按钮 */
.ppt-outline-card-btns {
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.ppt-outline-card:hover .ppt-outline-card-btns {
    opacity: 1;
}

.ppt-outline-card-btn {
    padding: 6px;
    border: none;
    background: transparent;
    color: #9ca3af;
    cursor: pointer;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.ppt-outline-card-btn:hover {
    background: var(--banana-50);
    color: var(--banana-600);
}

.ppt-outline-card-btn.delete:hover {
    background: #fef2f2;
    color: #ef4444;
}

/* ===== 弹出编辑器 ===== */
.ppt-popup-editor-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.ppt-popup-editor-overlay.show {
    opacity: 1;
}

.ppt-popup-editor {
    position: absolute;
    width: 360px;
    background: var(--ppt-white);
    border-radius: var(--radius-card);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.05);
    z-index: 1001;
    transform: scale(0.9) translateY(-10px);
    opacity: 0;
    transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.ppt-popup-editor.show {
    transform: scale(1) translateY(0);
    opacity: 1;
}

.ppt-popup-editor-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid #e5e7eb;
}

.ppt-popup-editor-header h4 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--ppt-black);
    display: flex;
    align-items: center;
    gap: 8px;
}

.ppt-popup-editor-header .page-badge {
    font-size: 12px;
    padding: 2px 8px;
    background: var(--banana-500);
    color: var(--ppt-black);
    border-radius: 4px;
    font-weight: 500;
}

.ppt-popup-editor-close {
    padding: 6px;
    border: none;
    background: transparent;
    color: #9ca3af;
    cursor: pointer;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.ppt-popup-editor-close:hover {
    background: #f3f4f6;
    color: #374151;
}

.ppt-popup-editor-body {
    padding: 20px;
}

.ppt-popup-editor-field {
    margin-bottom: 16px;
}

.ppt-popup-editor-field:last-child {
    margin-bottom: 0;
}

.ppt-popup-editor-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: #6b7280;
    margin-bottom: 8px;
}

.ppt-popup-editor-input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    font-size: 14px;
    color: var(--ppt-black);
    outline: none;
    transition: all var(--transition-fast);
}

.ppt-popup-editor-input:focus {
    border-color: var(--banana-500);
    box-shadow: 0 0 0 3px var(--banana-100);
}

.ppt-popup-editor-textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    font-size: 14px;
    color: var(--ppt-black);
    outline: none;
    resize: none;
    min-height: 120px;
    line-height: 1.6;
    transition: all var(--transition-fast);
}

.ppt-popup-editor-textarea:focus {
    border-color: var(--banana-500);
    box-shadow: 0 0 0 3px var(--banana-100);
}

.ppt-popup-editor-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    padding: 16px 20px;
    border-top: 1px solid #e5e7eb;
    background: #f9fafb;
    border-radius: 0 0 var(--radius-card) var(--radius-card);
}

/* 卡片只读模式下的要点显示 */
.ppt-outline-card-point-text {
    flex: 1;
    font-size: 14px;
    color: var(--ppt-black-80);
    line-height: 1.5;
}

/* ===== 描述卡片列表（3列网格） ===== */
.ppt-desc-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

@media (min-width: 768px) {
    .ppt-desc-list {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media (min-width: 1200px) {
    .ppt-desc-list {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
}

/* ===== 描述卡片（与PPT系统一致） ===== */
.ppt-desc-card {
    display: flex;
    flex-direction: column;
    background: var(--ppt-white);
    border: 1px solid #e5e7eb;
    border-radius: var(--radius-card);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    transition: all var(--transition-base);
}

.ppt-desc-card:hover {
    border-color: var(--banana-500);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.ppt-desc-card.generating {
    position: relative;
}

.ppt-desc-card.generating::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(255, 215, 0, 0.1) 50%,
        transparent 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    pointer-events: none;
}

/* 卡片头部（黄色背景） */
.ppt-desc-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--banana-50);
    border-bottom: 1px solid #e5e7eb;
}

.ppt-desc-card-title-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.ppt-desc-card-page {
    font-size: 14px;
    font-weight: 600;
    color: var(--ppt-black);
}

.ppt-desc-card-part {
    font-size: 12px;
    padding: 2px 8px;
    background: #e3f2fd;
    color: #1565c0;
    border-radius: 4px;
    font-weight: 500;
}

.ppt-desc-card-status {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 500;
}

.ppt-desc-card-status.pending {
    background: #f3f4f6;
    color: #6b7280;
}

.ppt-desc-card-status.generating {
    background: var(--banana-100);
    color: var(--banana-700);
}

.ppt-desc-card-status.completed {
    background: #dcfce7;
    color: #16a34a;
}

/* 卡片标题 */
.ppt-desc-card-title {
    padding: 12px 16px 0;
    font-size: 15px;
    font-weight: 600;
    color: var(--ppt-black);
}

/* 卡片内容 */
.ppt-desc-card-content {
    flex: 1;
    padding: 12px 16px;
    font-size: 13px;
    line-height: 1.7;
    color: var(--ppt-black-80);
}

.ppt-desc-card-content textarea {
    width: 100%;
    min-height: 120px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 12px;
    font-size: 13px;
    line-height: 1.6;
    color: var(--ppt-black-80);
    resize: vertical;
    transition: all var(--transition-base);
}

.ppt-desc-card-content textarea:focus {
    outline: none;
    border-color: var(--banana-500);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.1);
}

/* 无描述占位 */
.ppt-desc-card-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
    color: #9ca3af;
    text-align: center;
}

.ppt-desc-card-empty-icon {
    font-size: 32px;
    margin-bottom: 8px;
    opacity: 0.5;
}

.ppt-desc-card-empty-text {
    font-size: 13px;
}

/* 卡片底部操作区 */
.ppt-desc-card-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    padding: 12px 16px;
    border-top: 1px solid #e5e7eb;
    margin-top: auto;
}

/* 描述文本显示（非编辑状态） */
.ppt-desc-card-text {
    font-size: 13px;
    line-height: 1.8;
    color: #374151;
    white-space: pre-wrap;
    word-break: break-word;
}

/* 加载骨架屏 */
.ppt-desc-card-loading {
    padding: 8px 0;
}

.ppt-desc-card-skeleton {
    height: 14px;
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite;
    border-radius: 4px;
    margin-bottom: 10px;
}

.ppt-desc-card-skeleton.short {
    width: 60%;
}

.ppt-desc-card-loading-text {
    text-align: center;
    color: #9ca3af;
    font-size: 12px;
    margin-top: 12px;
}

@keyframes skeleton-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ===== 编辑弹窗 ===== */
.ppt-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.ppt-modal-overlay.show {
    opacity: 1;
}

.ppt-modal {
    width: 90%;
    max-width: 600px;
    background: var(--ppt-white);
    border-radius: var(--radius-card);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    transform: scale(0.9) translateY(-20px);
    opacity: 0;
    transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.ppt-modal.show {
    transform: scale(1) translateY(0);
    opacity: 1;
}

.ppt-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid #e5e7eb;
}

.ppt-modal-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--ppt-black);
    margin: 0;
}

.ppt-modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    font-size: 24px;
    color: #9ca3af;
    cursor: pointer;
    border-radius: 6px;
    transition: all var(--transition-fast);
}

.ppt-modal-close:hover {
    background: #f3f4f6;
    color: var(--ppt-black);
}

.ppt-modal-body {
    padding: 20px;
}

.ppt-modal-page-info {
    font-size: 14px;
    color: #6b7280;
    margin-bottom: 12px;
}

.ppt-modal-textarea {
    width: 100%;
    min-height: 250px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 14px;
    font-size: 14px;
    line-height: 1.7;
    color: var(--ppt-black);
    resize: vertical;
    transition: all var(--transition-base);
}

.ppt-modal-textarea:focus {
    outline: none;
    border-color: var(--banana-500);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.15);
}

.ppt-modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 20px;
    border-top: 1px solid #e5e7eb;
}

/* ===== 幻灯片预览卡片 ===== */
.ppt-slide-card {
    background: var(--ppt-white);
    border: 1px solid #e5e7eb;
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: all var(--transition-base);
}

.ppt-slide-card:hover {
    border-color: var(--banana-500);
    box-shadow: var(--shadow-lg);
}

.ppt-slide-card.selected {
    border-color: var(--banana-500);
    box-shadow: var(--shadow-yellow);
}

.ppt-slide-preview {
    aspect-ratio: 16/9;
    background: #f3f4f6;
    position: relative;
    overflow: hidden;
}

.ppt-slide-preview img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.ppt-slide-preview-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #9ca3af;
}

.ppt-slide-preview-empty-icon {
    font-size: 48px;
    margin-bottom: 8px;
}

.ppt-slide-info {
    padding: 12px 16px;
    border-top: 1px solid #e5e7eb;
}

.ppt-slide-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--ppt-black);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ppt-slide-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: #9ca3af;
}

/* ===== 进度条 ===== */
.ppt-progress {
    padding: 20px;
    background: var(--banana-50);
    border: 1px solid rgba(255, 215, 0, 0.2);
    border-radius: var(--radius-card);
    margin-bottom: 24px;
}

.ppt-progress-bar {
    height: 8px;
    background: rgba(255, 215, 0, 0.2);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 8px;
}

.ppt-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--banana-500), var(--banana-600));
    border-radius: 4px;
    transition: width 0.3s ease;
}

.ppt-progress-text {
    font-size: 13px;
    color: var(--ppt-black-80);
    text-align: center;
}

/* ===== 空状态 ===== */
.ppt-empty {
    text-align: center;
    padding: 60px 20px;
}

.ppt-empty-icon {
    font-size: 64px;
    color: #d1d5db;
    margin-bottom: 16px;
}

.ppt-empty-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--ppt-black);
    margin-bottom: 8px;
}

.ppt-empty-desc {
    font-size: 14px;
    color: #6b7280;
    margin-bottom: 24px;
}

/* ===== 预览区大图 ===== */
.ppt-preview-large {
    background: var(--ppt-white);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.ppt-preview-large-image {
    aspect-ratio: 16/9;
    background: #1a1a1a;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ppt-preview-large-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.ppt-preview-large-controls {
    padding: 16px;
    border-top: 1px solid #e5e7eb;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.ppt-preview-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.ppt-preview-page {
    font-size: 14px;
    color: var(--ppt-black-80);
    min-width: 80px;
    text-align: center;
}

/* ===== 网格布局 ===== */
.ppt-grid {
    display: grid;
    gap: 16px;
}

.ppt-grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.ppt-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.ppt-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* ===== 弹窗/模态框 ===== */
.ppt-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.ppt-modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.ppt-modal {
    background: var(--ppt-white);
    border-radius: var(--radius-panel);
    box-shadow: var(--shadow-2xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.9);
    transition: all var(--transition-base);
}

.ppt-modal-overlay.show .ppt-modal {
    transform: scale(1);
}

.ppt-modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.ppt-modal-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--ppt-black);
}

.ppt-modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    color: #6b7280;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.ppt-modal-close:hover {
    background: #f3f4f6;
    color: var(--ppt-black);
}

.ppt-modal-body {
    padding: 24px;
    overflow-y: auto;
    max-height: calc(90vh - 140px);
}

.ppt-modal-footer {
    padding: 16px 24px;
    border-top: 1px solid #e5e7eb;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* ===== Toast 通知 ===== */
.ppt-toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ppt-toast {
    padding: 12px 20px;
    background: var(--ppt-white);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    animation: slideIn 0.3s ease;
    max-width: 360px;
}

.ppt-toast.success {
    border-left: 4px solid var(--ppt-success);
}

.ppt-toast.error {
    border-left: 4px solid var(--ppt-error);
}

.ppt-toast.warning {
    border-left: 4px solid var(--ppt-warning);
}

.ppt-toast.info {
    border-left: 4px solid var(--ppt-info);
}

/* ===== 加载状态 ===== */
.ppt-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.ppt-loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid #e5e7eb;
    border-top-color: var(--banana-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.ppt-loading-text {
    margin-top: 16px;
    font-size: 14px;
    color: var(--ppt-black-80);
}

.ppt-loading-fullscreen {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.9);
    z-index: 9999;
}

/* ===== 动画 ===== */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes gradient {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

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

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .ppt-main-sidebar {
        width: 320px;
    }

    .ppt-grid-4 {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .ppt-card {
        padding: 20px;
    }

    .ppt-hero-title {
        font-size: 32px;
    }

    .ppt-tabs {
        flex-direction: column;
    }

    .ppt-main-layout {
        flex-direction: column;
    }

    .ppt-main-sidebar {
        width: 100%;
        border-left: none;
        border-top: 1px solid #e5e7eb;
    }

    .ppt-header {
        flex-wrap: wrap;
        gap: 12px;
    }

    .ppt-header-center {
        order: 3;
        max-width: 100%;
        width: 100%;
    }

    .ppt-grid-3,
    .ppt-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .ppt-grid-2,
    .ppt-grid-3,
    .ppt-grid-4 {
        grid-template-columns: 1fr;
    }
}

/* ===== 从教案生成 - 额外入口 ===== */
.ppt-plan-entry {
    margin-top: 24px;
    padding: 20px;
    background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
    border: 1px solid #a7f3d0;
    border-radius: var(--radius-card);
}

.ppt-plan-entry-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 600;
    color: #065f46;
    margin-bottom: 12px;
}

.ppt-plan-entry-desc {
    font-size: 13px;
    color: #047857;
    margin-bottom: 16px;
}

.ppt-plan-select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #a7f3d0;
    border-radius: 8px;
    font-size: 14px;
    background: var(--ppt-white);
    margin-bottom: 12px;
}

.ppt-plan-select:focus {
    outline: none;
    border-color: #10b981;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

/* ===== 预览页面布局（类似 PowerPoint） ===== */
.ppt-preview-app {
    background: #f3f4f6;
    height: calc(100vh - 60px);  /* 固定高度，不是min-height */
    display: flex;
    flex-direction: column;
    overflow: hidden;  /* 防止整体滚动 */
}

.ppt-preview-layout {
    display: flex;
    flex: 1;
    min-height: 0;  /* 关键：允许flex子元素收缩 */
    overflow: hidden;
}

/* 左侧缩略图侧边栏 */
.ppt-thumbnail-sidebar {
    width: 320px;
    background: var(--ppt-white);
    border-right: 1px solid #e5e7eb;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    min-height: 0;
}

/* 置顶操作栏 */
.ppt-thumbnail-actions-bar {
    padding: 16px;
    border-bottom: 1px solid #e5e7eb;
    flex-shrink: 0;
}

.ppt-thumbnail-header {
    padding: 12px 16px;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.ppt-thumbnail-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--ppt-black);
}

.ppt-thumbnail-count {
    font-size: 12px;
    color: #6b7280;
    background: #f3f4f6;
    padding: 2px 8px;
    border-radius: 10px;
}

.ppt-thumbnail-list {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 0;
}

/* 自定义滚动条 */
.ppt-thumbnail-list::-webkit-scrollbar {
    width: 6px;
}

.ppt-thumbnail-list::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 3px;
}

.ppt-thumbnail-list::-webkit-scrollbar-thumb {
    background: var(--banana-500);
    border-radius: 3px;
}

.ppt-thumbnail-list::-webkit-scrollbar-thumb:hover {
    background: var(--banana-600);
}

/* 缩略图卡片 */
.ppt-thumbnail-card {
    background: var(--ppt-white);
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.ppt-thumbnail-card:hover {
    border-color: var(--banana-500);
    box-shadow: var(--shadow-md);
}

.ppt-thumbnail-card.selected {
    border-color: var(--banana-500);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.3);
}

.ppt-thumbnail-card.selected .ppt-thumbnail-title-text {
    color: var(--banana-600);
    font-weight: 600;
}

.ppt-thumbnail-image {
    aspect-ratio: 16/9;
    background: #f9fafb;
    position: relative;
    overflow: hidden;
}

.ppt-thumbnail-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ppt-thumbnail-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #9ca3af;
    font-size: 11px;
}

.ppt-thumbnail-empty-icon {
    font-size: 24px;
    margin-bottom: 4px;
}

.ppt-thumbnail-info {
    padding: 10px 12px;
}

.ppt-thumbnail-title-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.ppt-thumbnail-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 22px;
    padding: 0 6px;
    background: var(--banana-500);
    color: var(--ppt-black);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
}

.ppt-thumbnail-title-text {
    font-size: 13px;
    color: var(--ppt-black);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
    min-width: 0;
}

/* 缩略图状态徽章（右下角） */
.ppt-thumbnail-badge {
    position: absolute;
    bottom: 6px;
    right: 6px;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 10px;
    font-weight: 600;
    z-index: 5;
}

.ppt-thumbnail-badge.pending {
    background: rgba(255, 255, 255, 0.9);
    color: #9ca3af;
    border: 1px solid #e5e7eb;
}

.ppt-thumbnail-badge.completed {
    background: #16a34a;
    color: white;
}

/* 右侧大图预览区 */
.ppt-preview-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
}

.ppt-preview-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px;
    background: linear-gradient(135deg, var(--banana-50) 0%, #ffffff 50%, #f9fafb 100%);
    overflow: hidden;
    min-height: 0;
}

.ppt-preview-wrapper {
    width: 100%;
    max-width: 1000px;
}

.ppt-preview-image {
    aspect-ratio: 16/9;
    background: var(--ppt-white);
    border-radius: 12px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ppt-preview-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    user-select: none;
}

.ppt-preview-image-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    background: #f9fafb;
    color: #6b7280;
}

.ppt-preview-image-empty-icon {
    font-size: 64px;
    margin-bottom: 16px;
    color: #d1d5db;
}

.ppt-preview-image-empty-title {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--ppt-black);
}

.ppt-preview-image-empty-desc {
    font-size: 14px;
    margin-bottom: 20px;
}

/* 底部控制栏 */
.ppt-preview-controls {
    background: var(--ppt-white);
    border-top: 1px solid #e5e7eb;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.ppt-preview-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.ppt-preview-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 悬停操作按钮 */
.ppt-thumbnail-card {
    position: relative;
}

.ppt-thumbnail-actions {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    gap: 8px;
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: 10;
}

.ppt-thumbnail-card:hover .ppt-thumbnail-actions {
    opacity: 1;
}

.ppt-thumbnail-card:hover .ppt-thumbnail-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
}

.ppt-thumbnail-action-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--ppt-white);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 14px;
}

.ppt-thumbnail-action-btn:hover {
    background: var(--banana-50);
    transform: scale(1.1);
}

/* 响应式 */
@media (max-width: 1024px) {
    .ppt-thumbnail-sidebar {
        width: 260px;
    }

    .ppt-preview-container {
        padding: 24px;
    }
}

@media (max-width: 768px) {
    .ppt-preview-layout {
        flex-direction: column;
    }

    .ppt-thumbnail-sidebar {
        width: 100%;
        height: auto;
        max-height: 200px;
        border-right: none;
        border-bottom: 1px solid #e5e7eb;
    }

    .ppt-thumbnail-actions-bar {
        display: none;
    }

    .ppt-thumbnail-list {
        flex-direction: row;
        overflow-x: auto;
        overflow-y: hidden;
        padding: 12px;
        gap: 12px;
    }

    .ppt-thumbnail-card {
        width: 140px;
        flex-shrink: 0;
    }

    .ppt-preview-container {
        padding: 16px;
    }

    .ppt-preview-controls {
        flex-wrap: wrap;
        gap: 12px;
    }
}

/* ===== 批量生成确认弹窗 ===== */
.ppt-generate-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.ppt-generate-modal-overlay.show {
    opacity: 1;
}

.ppt-generate-modal {
    width: 90%;
    max-width: 560px;
    background: var(--ppt-white);
    border-radius: var(--radius-card);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    transform: scale(0.9) translateY(-20px);
    opacity: 0;
    transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.ppt-generate-modal.show {
    transform: scale(1) translateY(0);
    opacity: 1;
}

.ppt-generate-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid #e5e7eb;
}

.ppt-generate-modal-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--ppt-black);
    margin: 0;
}

.ppt-generate-modal-subtitle {
    font-size: 14px;
    color: #6b7280;
    margin-top: 4px;
}

.ppt-generate-modal-body {
    padding: 24px;
}

.ppt-generate-section {
    margin-bottom: 24px;
}

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

.ppt-generate-section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--ppt-black);
    margin-bottom: 12px;
}

.ppt-generate-section-desc {
    font-size: 13px;
    color: #6b7280;
    margin-bottom: 12px;
}

/* 模板网格 */
.ppt-template-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.ppt-template-item {
    aspect-ratio: 16/9;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    background: #f9fafb;
}

.ppt-template-item:hover {
    border-color: var(--banana-400);
}

.ppt-template-item.selected {
    border-color: var(--banana-500);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.3);
}

.ppt-template-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ppt-template-name {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 6px 8px;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    color: white;
    font-size: 12px;
    font-weight: 500;
    text-align: center;
}

.ppt-template-check {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 20px;
    height: 20px;
    background: var(--banana-500);
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    color: var(--ppt-black);
    font-size: 12px;
    font-weight: bold;
}

.ppt-template-item.selected .ppt-template-check {
    display: flex;
}

/* 额外要求输入 */
.ppt-generate-textarea {
    width: 100%;
    min-height: 80px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 12px;
    font-size: 14px;
    line-height: 1.6;
    color: var(--ppt-black);
    resize: vertical;
    transition: all var(--transition-base);
}

.ppt-generate-textarea:focus {
    outline: none;
    border-color: var(--banana-500);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.15);
}

.ppt-generate-modal-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    border-top: 1px solid #e5e7eb;
    background: #f9fafb;
}

.ppt-generate-cost {
    font-size: 14px;
    color: #6b7280;
}

.ppt-generate-cost strong {
    color: var(--banana-600);
    font-weight: 600;
}

.ppt-generate-modal-actions {
    display: flex;
    gap: 12px;
}

/* 弹窗关闭按钮 */
.ppt-generate-modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: #9ca3af;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    transition: color 0.2s;
}

.ppt-generate-modal-close:hover {
    color: #374151;
}

/* 弹窗信息提示 */
.ppt-generate-modal-info {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: #fef3c7;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    color: #92400e;
}

.ppt-generate-modal-info-icon {
    font-size: 18px;
}

/* 弹窗区块 */
.ppt-generate-modal-section {
    margin-bottom: 20px;
}

.ppt-generate-modal-section:last-child {
    margin-bottom: 0;
}

.ppt-generate-modal-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--ppt-black);
    margin-bottom: 12px;
}

/* 弹窗输入框 */
.ppt-generate-modal-textarea {
    width: 100%;
    min-height: 80px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 12px;
    font-size: 14px;
    line-height: 1.6;
    color: var(--ppt-black);
    resize: vertical;
    font-family: inherit;
    transition: all var(--transition-base);
}

.ppt-generate-modal-textarea:focus {
    outline: none;
    border-color: var(--banana-500);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.15);
}

.ppt-generate-modal-textarea::placeholder {
    color: #9ca3af;
}

/* 模板预览块 */
.ppt-template-preview {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ppt-template-preview-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 6px 6px 0 0;
}

.ppt-template-icon {
    font-size: 24px;
    opacity: 0.8;
}

/* ===== 历史项目区域 ===== */
.ppt-history-section {
    margin-top: 32px;
    background: var(--ppt-white);
    border-radius: var(--radius-panel);
    padding: 24px;
    box-shadow: var(--shadow-md);
}

.ppt-history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid #e5e7eb;
}

.ppt-history-header-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 600;
    color: var(--ppt-black);
}

.ppt-history-header-link {
    font-size: 14px;
    color: var(--banana-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.ppt-history-header-link:hover {
    color: var(--banana-500);
    text-decoration: underline;
}

.ppt-history-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.ppt-history-card {
    background: var(--ppt-white);
    border: 1px solid #e5e7eb;
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: all var(--transition-base);
}

.ppt-history-card:hover {
    border-color: var(--banana-500);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.ppt-history-thumbnail {
    position: relative;
    aspect-ratio: 16/9;
    background: #f3f4f6;
    overflow: hidden;
}

.ppt-history-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ppt-history-thumbnail-empty {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    color: #d1d5db;
    background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
}

.ppt-history-status {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 500;
    border-radius: 4px;
    background: rgba(0, 0, 0, 0.6);
    color: white;
}

.ppt-history-status.completed {
    background: rgba(22, 163, 74, 0.9);
}

.ppt-history-status.generating {
    background: rgba(234, 179, 8, 0.9);
}

.ppt-history-status.description {
    background: rgba(59, 130, 246, 0.9);
}

/* ===== 教案预览弹窗 ===== */
.ppt-plan-preview-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ppt-plan-preview-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.ppt-plan-preview-content {
    position: relative;
    background: #fff;
    border-radius: 12px;
    width: 90%;
    max-width: 900px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

.ppt-plan-preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid #e5e7eb;
    flex-shrink: 0;
}

.ppt-plan-preview-header h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.ppt-plan-preview-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #9ca3af;
    line-height: 1;
}

.ppt-plan-preview-body {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 20px;
    background: #fff;
    min-height: 0;
}

.ppt-plan-preview-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 14px 20px;
    border-top: 1px solid #e5e7eb;
    flex-shrink: 0;
}

.ppt-history-status.outline {
    background: rgba(139, 92, 246, 0.9);
}

.ppt-history-status.draft {
    background: rgba(107, 114, 128, 0.9);
}

.ppt-history-info {
    padding: 16px;
}

.ppt-history-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--ppt-black);
    margin-bottom: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ppt-history-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: #6b7280;
    margin-bottom: 8px;
}

.ppt-history-time {
    font-size: 12px;
    color: #9ca3af;
}

.ppt-history-actions {
    padding: 12px 16px;
    border-top: 1px solid #f3f4f6;
    display: flex;
    gap: 8px;
}

.ppt-history-actions .ppt-btn {
    flex: 1;
}

.ppt-history-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 48px 20px;
    color: #9ca3af;
    font-size: 14px;
}

.ppt-history-footer {
    display: flex;
    justify-content: center;
    margin-top: 16px;
}

.ppt-history-footer .ppt-btn {
    align-items: center;
}

/* 响应式 - 历史项目 */
@media (max-width: 768px) {
    .ppt-history-grid {
        grid-template-columns: 1fr;
    }

    .ppt-history-section {
        padding: 16px;
        margin-top: 24px;
    }
}

/* ===== 流式生成样式 ===== */
.ppt-stream-container {
    background: linear-gradient(135deg, #fefce8 0%, #fef9c3 100%);
    border: 2px solid var(--banana-100);
    border-radius: var(--radius-panel);
    padding: 24px;
    min-height: 400px;
    max-height: 600px;
    display: flex;
    flex-direction: column;
}

.ppt-stream-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--banana-100);
    margin-bottom: 16px;
    font-size: 16px;
    font-weight: 600;
    color: var(--ppt-black);
}

.ppt-stream-icon {
    font-size: 24px;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

.ppt-stream-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.8;
    color: var(--ppt-black-80);
}

.ppt-stream-content::-webkit-scrollbar {
    width: 6px;
}

.ppt-stream-content::-webkit-scrollbar-track {
    background: transparent;
}

.ppt-stream-content::-webkit-scrollbar-thumb {
    background: var(--banana-100);
    border-radius: 3px;
}

/* 打字机光标效果 */
.ppt-stream-content::after {
    content: '▋';
    animation: blink 1s step-end infinite;
    color: var(--banana-500);
}

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

/* ===== 教案选择区域 ===== */
.ppt-plan-area {
    margin-top: 24px;
    padding: 20px;
    background: var(--ppt-white);
    border: 1px solid #e5e7eb;
    border-radius: 12px;
}

.ppt-plan-select-wrapper {
    display: flex;
    gap: 12px;
    align-items: stretch;
}

.ppt-plan-select {
    flex: 1;
    height: 44px;
    padding: 0 16px;
    font-size: 15px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    background: var(--ppt-white);
    color: var(--ppt-black);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-sizing: border-box;
}

.ppt-plan-select-wrapper .ppt-btn {
    height: 44px;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    box-sizing: border-box;
}

.ppt-plan-select:hover {
    border-color: var(--banana-400);
}

.ppt-plan-select:focus {
    outline: none;
    border-color: var(--banana-500);
    box-shadow: 0 0 0 3px rgba(234, 179, 8, 0.1);
}

/* ===== 风格展示预览（ppt.html 首页） ===== */
.ppt-style-preview {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.ppt-style-preview-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.ppt-style-preview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.ppt-style-preview-item {
    aspect-ratio: 16 / 9;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.ppt-style-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.ppt-style-preview-hint {
    text-align: left;
    color: var(--text-secondary);
    font-size: 13px;
    margin-top: 12px;
    margin-bottom: 0;
}

/* ===== 模板选择区域标题 ===== */
.ppt-template-header {
    text-align: center;
    margin-bottom: 32px;
}

.ppt-template-main-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--ppt-black);
    margin-bottom: 8px;
}

.ppt-template-subtitle {
    font-size: 16px;
    color: var(--ppt-black-60);
}

/* ===== 自定义风格 ===== */
.ppt-custom-style {
    margin-top: 32px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.ppt-custom-style-divider {
    display: flex;
    align-items: center;
    margin-bottom: 16px;
    color: var(--ppt-black-40);
    font-size: 14px;
}

.ppt-custom-style-divider::before,
.ppt-custom-style-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: #e5e7eb;
}

.ppt-custom-style-divider span {
    padding: 0 16px;
}

.ppt-custom-style-input {
    width: 100%;
    padding: 14px 18px;
    font-size: 15px;
    border: 1px solid #d1d5db;
    border-radius: 10px;
    background: var(--ppt-white);
    color: var(--ppt-black);
    transition: all var(--transition-fast);
    box-sizing: border-box;
}

.ppt-custom-style-input:hover {
    border-color: var(--banana-400);
}

.ppt-custom-style-input:focus {
    outline: none;
    border-color: var(--banana-500);
    box-shadow: 0 0 0 3px rgba(234, 179, 8, 0.1);
}

.ppt-custom-style-input::placeholder {
    color: #9ca3af;
}

.ppt-custom-style-hint {
    margin-top: 10px;
    font-size: 13px;
    color: var(--ppt-black-40);
    text-align: center;
}

/* ===== 教案预览弹窗 ===== */
.ppt-plan-preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ppt-plan-preview-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}

.ppt-plan-preview-content {
    position: relative;
    background: var(--ppt-white);
    border-radius: var(--radius-panel);
    width: 90%;
    max-width: 860px;
    max-height: 90vh;
    box-shadow: var(--shadow-2xl);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.ppt-plan-preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    border-bottom: 1px solid #e5e7eb;
    flex-shrink: 0;
}

.ppt-plan-preview-header h3 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
    color: var(--ppt-black);
}

.ppt-plan-preview-close {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: #9ca3af;
    line-height: 1;
    padding: 0;
    transition: color var(--transition-fast);
}

.ppt-plan-preview-close:hover {
    color: var(--ppt-black);
}

.ppt-plan-preview-body {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    background: #f5f5f5;
}

.ppt-plan-preview-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid #e5e7eb;
    background: var(--ppt-white);
    flex-shrink: 0;
}