* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: #fafafa;
    min-height: 100vh;
    padding: 0;
    color: #1a1a1a;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 60px 20px 40px;
    background: white;
    border-bottom: 1px solid #e5e5e5;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 12px;
    font-weight: 600;
    color: #000;
    letter-spacing: -0.02em;
}

header p {
    font-size: 1em;
    color: #666;
    font-weight: 400;
}

.main-content {
    display: grid;
    grid-template-columns: 420px 1fr;
    gap: 0;
    min-height: calc(100vh - 180px);
}

.input-section {
    background: white;
    padding: 40px;
    border-right: 1px solid #e5e5e5;
    overflow-y: auto;
    max-height: calc(100vh - 180px);
}

.preview-section {
    background: #fafafa;
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.preview-header {
    width: 100%;
    max-width: 1000px;
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    justify-content: flex-end;
}

.btn-edit {
    padding: 10px 20px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    background: white;
    color: #333;
    font-size: 0.9em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-edit:hover {
    background: #fafafa;
    border-color: #000;
}

.btn-edit.active {
    background: #000;
    color: white;
    border-color: #000;
}

.edit-icon {
    font-size: 1em;
}

h2 {
    font-size: 1.1em;
    margin-bottom: 30px;
    color: #000;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
    font-size: 0.9em;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    font-size: 0.95em;
    transition: all 0.2s;
    font-family: inherit;
    background: white;
    color: #1a1a1a;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #000;
    background: #fafafa;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-group small {
    display: block;
    margin-top: 6px;
    color: #999;
    font-size: 0.85em;
}

.btn-primary, .btn-secondary {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 6px;
    font-size: 1em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.btn-primary {
    background: #000;
    color: white;
}

.btn-primary:hover {
    background: #333;
}

.btn-primary:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.btn-secondary {
    background: white;
    color: #000;
    border: 1px solid #e0e0e0;
    margin-top: 20px;
}

.btn-secondary:hover {
    background: #fafafa;
    border-color: #000;
}

.download-buttons {
    display: flex;
    gap: 12px;
    width: 100%;
    max-width: 1000px;
    margin-top: 20px;
}

.download-buttons .btn-secondary {
    flex: 1;
    margin-top: 0;
}

.slide-container {
    width: 100%;
    max-width: 1000px;
    aspect-ratio: 16/9;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
    background: white;
    position: relative;
}

.slide-container.edit-mode .slide-title,
.slide-container.edit-mode .slide-subtitle,
.slide-container.edit-mode .slide-content {
    outline: 2px dashed transparent;
    transition: outline 0.2s;
    cursor: text;
}

.slide-container.edit-mode .slide-title:hover,
.slide-container.edit-mode .slide-subtitle:hover,
.slide-container.edit-mode .slide-content:hover {
    outline-color: rgba(255,255,255,0.4);
}

.slide-container.edit-mode .slide-title:focus,
.slide-container.edit-mode .slide-subtitle:focus,
.slide-container.edit-mode .slide-content:focus {
    outline-color: rgba(255,255,255,0.8);
    outline-style: solid;
}

.edit-hint {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0,0,0,0.75);
    color: white;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.85em;
    z-index: 100;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s;
}

.edit-hint.show {
    opacity: 1;
}

.placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: white;
    color: #999;
}

.placeholder-icon {
    font-size: 3em;
    margin-bottom: 16px;
    opacity: 0.5;
}

.placeholder p {
    font-size: 0.95em;
    color: #999;
}

/* PPT 模板样式 - 专业级排版设计 */
.slide {
    width: 100%;
    height: 100%;
    padding: 80px 100px;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    font-family: 'Helvetica Neue', 'Arial', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* 1. Bold & Vibrant - 左对齐，强烈对比 */
.gradient-modern {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    justify-content: center;
    align-items: flex-start;
}

.gradient-modern .slide-title {
    font-size: 6.5em;
    font-weight: 900;
    margin-bottom: 20px;
    line-height: 0.95;
    letter-spacing: -0.05em;
    text-transform: uppercase;
    max-width: 90%;
}

.gradient-modern .slide-subtitle {
    font-size: 1.3em;
    font-weight: 300;
    opacity: 0.75;
    margin-bottom: 80px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.gradient-modern .slide-content {
    font-size: 1.4em;
    line-height: 1.9;
    font-weight: 400;
    max-width: 750px;
    opacity: 0.95;
}

/* 2. Swiss Minimalism - 居中对齐，极致留白 */
.minimal-elegant {
    background: #ffffff;
    color: #000;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.minimal-elegant::before {
    content: '';
    position: absolute;
    top: 60px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: #000;
}

.minimal-elegant .slide-title {
    font-size: 5.5em;
    font-weight: 300;
    margin-bottom: 30px;
    margin-top: 40px;
    color: #000;
    line-height: 1.15;
    letter-spacing: -0.02em;
    max-width: 900px;
}

.minimal-elegant .slide-subtitle {
    font-size: 1.8em;
    color: #999;
    font-weight: 700;
    margin-bottom: 60px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.minimal-elegant .slide-content {
    font-size: 1.15em;
    line-height: 2.3;
    color: #444;
    font-weight: 400;
    max-width: 650px;
    margin: 0 auto;
}

/* 3. Tech Brutalism - 右对齐，等宽字体 */
.tech-future {
    background: #000;
    color: #00ff88;
    justify-content: center;
    align-items: flex-end;
    text-align: right;
}

.tech-future::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(90deg, transparent 0%, transparent calc(100% - 2px), #00ff88 calc(100% - 2px), #00ff88 100%),
        linear-gradient(0deg, transparent 0%, transparent calc(100% - 2px), #00ff88 calc(100% - 2px), #00ff88 100%);
    opacity: 0.3;
}

.tech-future .slide-title {
    font-size: 7em;
    font-weight: 900;
    margin-bottom: 25px;
    line-height: 0.9;
    letter-spacing: -0.06em;
    text-shadow: 0 0 40px rgba(0,255,136,0.4);
    position: relative;
    z-index: 1;
    font-family: 'Courier New', 'Consolas', monospace;
    text-transform: uppercase;
}

.tech-future .slide-subtitle {
    font-size: 1.1em;
    color: #00ff88;
    opacity: 0.6;
    margin-bottom: 70px;
    position: relative;
    z-index: 1;
    font-weight: 400;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.tech-future .slide-content {
    font-size: 1.25em;
    line-height: 2;
    color: #00ff88;
    opacity: 0.85;
    position: relative;
    z-index: 1;
    max-width: 700px;
    font-weight: 300;
}

/* 4. Playful Modern - 左对齐，色彩层次 */
.warm-creative {
    background: linear-gradient(135deg, #ff6b6b 0%, #feca57 100%);
    color: white;
    justify-content: flex-start;
    align-items: flex-start;
    padding-top: 120px;
}

.warm-creative::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: rgba(255,255,255,0.15);
    border-radius: 50%;
    top: -250px;
    right: -100px;
}

.warm-creative::after {
    content: '';
    position: absolute;
    width: 350px;
    height: 350px;
    background: rgba(0,0,0,0.08);
    border-radius: 50%;
    bottom: -150px;
    left: -100px;
}

.warm-creative .slide-title {
    font-size: 6em;
    font-weight: 800;
    margin-bottom: 25px;
    line-height: 1;
    position: relative;
    z-index: 1;
    letter-spacing: -0.04em;
    max-width: 85%;
}

.warm-creative .slide-subtitle {
    font-size: 2.2em;
    font-weight: 300;
    opacity: 0.85;
    margin-bottom: 70px;
    position: relative;
    z-index: 1;
    letter-spacing: 0.02em;
}

.warm-creative .slide-content {
    font-size: 1.35em;
    line-height: 2;
    font-weight: 400;
    max-width: 750px;
    position: relative;
    z-index: 1;
    opacity: 0.95;
}

/* 5. Corporate Clean - 左对齐，几何装饰 */
.business-pro {
    background: #0f172a;
    color: white;
    justify-content: center;
    align-items: flex-start;
}

.business-pro::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 45%;
    height: 100%;
    background: linear-gradient(135deg, rgba(99,102,241,0.12) 0%, rgba(168,85,247,0.12) 100%);
    clip-path: polygon(25% 0, 100% 0, 100% 100%, 0% 100%);
}

.business-pro::after {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 200px;
    background: linear-gradient(180deg, #6366f1 0%, #a855f7 100%);
}

.business-pro .slide-title {
    font-size: 5.2em;
    font-weight: 700;
    margin-bottom: 30px;
    position: relative;
    z-index: 1;
    line-height: 1.1;
    letter-spacing: -0.04em;
    max-width: 80%;
}

.business-pro .slide-subtitle {
    font-size: 1.4em;
    font-weight: 600;
    margin-bottom: 60px;
    position: relative;
    z-index: 1;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #a78bfa;
    opacity: 0.9;
}

.business-pro .slide-content {
    font-size: 1.3em;
    line-height: 2.1;
    font-weight: 300;
    max-width: 700px;
    position: relative;
    z-index: 1;
    opacity: 0.9;
}

/* 6. Image Overlay - 底部左对齐，强对比 */
.unsplash-bg {
    background-size: cover;
    background-position: center;
    color: white;
    justify-content: flex-end;
    align-items: flex-start;
    padding-bottom: 100px;
}

.unsplash-bg::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60%;
    background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, transparent 100%);
}

.unsplash-bg .slide-title {
    font-size: 6.5em;
    font-weight: 900;
    margin-bottom: 25px;
    line-height: 0.95;
    text-shadow: 0 4px 30px rgba(0,0,0,0.7);
    letter-spacing: -0.05em;
    position: relative;
    z-index: 1;
    max-width: 90%;
}

.unsplash-bg .slide-subtitle {
    font-size: 1.6em;
    font-weight: 300;
    margin-bottom: 50px;
    text-shadow: 0 2px 15px rgba(0,0,0,0.6);
    letter-spacing: 0.05em;
    opacity: 0.95;
    position: relative;
    z-index: 1;
}

.unsplash-bg .slide-content {
    font-size: 1.3em;
    line-height: 2;
    font-weight: 400;
    max-width: 800px;
    text-shadow: 0 2px 15px rgba(0,0,0,0.6);
    background: rgba(0,0,0,0.5);
    padding: 40px 50px;
    border-radius: 0;
    backdrop-filter: blur(15px);
    border-left: 5px solid white;
    position: relative;
    z-index: 1;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 380px 1fr;
    }
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .input-section {
        border-right: none;
        border-bottom: 1px solid #e5e5e5;
        max-height: none;
    }
    
    .preview-section {
        min-height: 600px;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }
    
    .input-section,
    .preview-section {
        padding: 24px;
    }
    
    .slide {
        padding: 40px 50px;
    }
    
    .slide-title {
        font-size: 3em !important;
    }
}

/* 更换底图模态框 */
.background-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: white;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.modal-header {
    padding: 24px 24px 16px;
    border-bottom: 1px solid #e5e5e5;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.2em;
    font-weight: 600;
    color: #000;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.8em;
    color: #999;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: all 0.2s;
}

.modal-close:hover {
    background: #f5f5f5;
    color: #000;
}

.modal-body {
    padding: 24px;
}

.bg-option-group label {
    display: block;
    margin-bottom: 12px;
    font-weight: 500;
    color: #333;
    font-size: 0.9em;
}

.bg-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.bg-option-btn {
    padding: 12px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    background: white;
    color: #333;
    font-size: 0.9em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.bg-option-btn:hover {
    border-color: #000;
    background: #fafafa;
}

.bg-option-btn.active {
    background: #000;
    color: white;
    border-color: #000;
}

.bg-settings {
    margin-top: 16px;
}

.bg-settings label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
    font-size: 0.9em;
}

.bg-settings input,
.bg-settings select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    font-size: 0.9em;
    font-family: inherit;
}

.bg-settings small {
    display: block;
    margin-top: 6px;
    color: #999;
    font-size: 0.85em;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid #e5e5e5;
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.btn-cancel,
.btn-confirm {
    padding: 10px 24px;
    border-radius: 6px;
    font-size: 0.9em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.btn-cancel {
    background: white;
    color: #666;
    border: 1px solid #e0e0e0;
}

.btn-cancel:hover {
    background: #fafafa;
    border-color: #000;
    color: #000;
}

.btn-confirm {
    background: #000;
    color: white;
}

.btn-confirm:hover {
    background: #333;
}

.btn-confirm:disabled {
    background: #ccc;
    cursor: not-allowed;
}

/* 文字样式工具栏 */
.text-style-toolbar {
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 20px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    display: flex;
    gap: 20px;
    align-items: flex-end;
    flex-wrap: wrap;
    max-width: 1000px;
    width: 100%;
}

.toolbar-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.toolbar-group label {
    font-size: 0.85em;
    color: #666;
    font-weight: 500;
}

.toolbar-group input[type="color"] {
    width: 60px;
    height: 36px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    cursor: pointer;
    padding: 2px;
}

.toolbar-group input[type="number"] {
    width: 80px;
    padding: 8px 10px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    font-size: 0.9em;
}

.toolbar-group select {
    padding: 8px 10px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    font-size: 0.9em;
    background: white;
    cursor: pointer;
    min-width: 120px;
}

.toolbar-group input:focus,
.toolbar-group select:focus {
    outline: none;
    border-color: #000;
}

.align-buttons {
    display: flex;
    gap: 4px;
}

.align-btn {
    width: 36px;
    height: 36px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    background: white;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.align-btn:hover {
    background: #fafafa;
    border-color: #000;
}

.align-btn.active {
    background: #000;
    color: white;
    border-color: #000;
}

/* 选中文字时的提示 */
.text-selected-hint {
    position: absolute;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0,0,0,0.85);
    color: white;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.8em;
    white-space: nowrap;
    pointer-events: none;
    z-index: 10;
}

.text-selected-hint::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid rgba(0,0,0,0.85);
}