:root {
    --primary-color: #1976d2;
    --primary-light: #42a5f5;
    --text-primary: rgba(0, 0, 0, 0.87);
    --text-secondary: rgba(0, 0, 0, 0.6);
    --background-color: #f5f5f5;
    --card-background: #ffffff;
    --border-color: #e0e0e0;
    --border-radius: 16px;
}

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

body {
    font-family: 'Google Sans', 'Google Sans Display', sans-serif;
    color: var(--text-primary);
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    line-height: 1.6;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 20px;
    width: 100%;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    margin-bottom: 80px;
    text-align: center;
}

header h1 {
    font-family: 'Google Sans Display', 'Google Sans', sans-serif;
    font-size: 2.5rem;
    font-weight: 300;
    margin: 0;
    padding: 0 0 16px;
}

.subtitle {
    font-family: 'Google Sans Display', 'Google Sans', sans-serif;
    font-size: 1.2rem;
    margin: 0;
    font-weight: 300;
}

/* 功能列表样式 */
.feature-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 600px;
    margin: 0 auto;
    flex: 1;
    justify-content: center;
}

.feature-item {
    display: flex;
    align-items: center;
    padding: 20px;
    background: white;
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-primary);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    gap: 20px;
    position: relative;
}

.feature-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.feature-item i.material-icons {
    font-size: 32px;
    color: var(--primary-color);
}

.feature-item i.navigate {
    margin-left: auto;
    color: var(--text-secondary);
}

.feature-content {
    flex: 1;
}

.feature-content h2 {
    font-family: 'Google Sans', sans-serif;
    font-size: 1.25rem;
    font-weight: 500;
    margin: 0 0 4px 0;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.feature-content h2 .dev-badge {
    font-size: 0.75rem;
    font-weight: 400;
    padding: 2px 8px;
    border-radius: 12px;
    background-color: #ff9800;
    color: white;
}

.feature-content h2 .test-badge {
    font-size: 0.75rem;
    font-weight: 400;
    padding: 2px 8px;
    border-radius: 12px;
    background-color: #4caf50;
    color: white;
}

.feature-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

/* 页面通用样式 */
.page-header {
    display: flex;
    align-items: center;
    margin-bottom: 32px;
    gap: 16px;
}

.back-button {
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.2s ease;
}

.back-button:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.page-title {
    font-family: 'Google Sans Display', sans-serif;
    font-size: 1.5rem;
    font-weight: 400;
    margin: 0;
}

/* 响应式调整 */
@media (max-width: 600px) {
    .container {
        padding: 60px 24px;
    }
    
    header {
        margin-bottom: 60px;
    }
    
    header h1 {
        font-size: 2rem;
        padding: 0 0 20px;
    }
    
    .feature-item {
        padding: 20px;
    }
    
    .feature-item i.material-icons {
        font-size: 28px;
    }

    footer {
        margin-top: 60px;
        padding: 24px 0;
    }
}

footer {
    margin-top: 80px;
    padding: 20px 0;
    color: var(--text-secondary);
    text-align: center;
}

footer a {
    text-decoration: none;
    font-weight: 500;
}

/* 错误消息样式 */
.error-message {
    color: #d32f2f;
    background-color: #ffebee;
    padding: 12px;
    border-radius: 4px;
    margin: 8px 0;
}

/* 成功消息样式 */
.success-message {
    color: #2e7d32;
    background-color: #e8f5e9;
    padding: 12px;
    border-radius: 4px;
    margin: 8px 0;
}

/* 禁用状态样式 */
select option:disabled {
    color: #999;
}

.os-select {
    margin-bottom: 1rem;
}

.lang-select {
    margin-bottom: 1rem;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

.file-preview {
    margin-top: 1rem;
    max-width: 100%;
    overflow: hidden;
    border-radius: 5px;
}

.file-preview img,
.file-preview video {
    max-width: 100%;
    max-height: 200px;
    object-fit: contain;
    border-radius: 5px;
    border: 1px solid var(--border-color);
}

.result-content div {
    margin-bottom: 0.5rem;
    padding: 0.25rem 0;
    border-bottom: 1px solid var(--border-color);
}

.download-buttons button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

/* 功能页面样式 */
.page-content {
    max-width: 600px;
    margin: 0 auto;
    padding: 24px;
    background: white;
    border-radius: var(--border-radius);
}

.page-content .input-field {
    margin-bottom: 24px;
    position: relative;
}

.page-content label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 8px;
    display: block;
    position: relative;
    background: transparent;
}

/* 下拉框样式 */
.page-content select.browser-default {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    width: 100%;
    background-color: white;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    padding-right: 32px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 16px;
    font-family: 'Google Sans', sans-serif;
    color: var(--text-primary);
    margin-top: 4px;
}

.page-content select.browser-default:focus {
    border-color: var(--primary-color);
    outline: none;
}

/* 文件输入框样式 */
.page-content .file-field {
    margin-top: 0;
}

.page-content .file-field .btn {
    border-radius: 8px;
    height: 36px;
    line-height: 36px;
    padding: 0 16px;
    margin-top: 4px;
}

.page-content .file-field .file-path-wrapper {
    padding-left: 16px;
    margin-top: 4px;
}

.page-content .file-field .file-path {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    height: 36px;
    line-height: 36px;
    padding: 0 12px;
    box-sizing: border-box;
    font-family: 'Google Sans', sans-serif;
    margin-top: 0;
}

.page-content .file-field .file-path:focus {
    border-color: var(--primary-color);
    box-shadow: none;
}

/* 大按钮样式 */
.page-content .btn-large {
    margin-top: 32px;
    border-radius: 8px;
    height: 48px;
    line-height: 48px;
    width: 100%;
    text-transform: none;
    font-family: 'Google Sans', sans-serif;
    font-weight: 500;
}

.result-area {
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
}

#resultContent {
    background: rgba(0, 0, 0, 0.03);
    padding: 16px;
    border-radius: var(--border-radius);
    margin-bottom: 16px;
    font-family: 'Google Sans Mono', monospace;
    white-space: pre-wrap;
    word-break: break-all;
}

#downloadButtons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

#downloadButtons .btn {
    flex: 1;
    min-width: 140px;
}

.file-preview {
    margin-top: 16px;
    text-align: center;
}

.file-preview img,
.file-preview video {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* 加载状态 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--primary-light);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
}

/* 错误和成功消息 */
.message {
    padding: 16px;
    border-radius: var(--border-radius);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.message i {
    font-size: 24px;
}

.message.error {
    background-color: #ffebee;
    color: #c62828;
}

.message.success {
    background-color: #e8f5e9;
    color: #2e7d32;
}

/* 响应式调整 */
@media (max-width: 600px) {
    :root {
        --border-radius: 12px;
    }

    .page-content {
        padding: 16px;
    }

    .page-content .btn-large {
        margin-top: 24px;
    }

    #downloadButtons {
        flex-direction: column;
    }

    #downloadButtons .btn {
        width: 100%;
    }
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.preview-modal {
    max-width: 90vw !important;
    width: auto !important;
    height: auto !important;
    max-height: 90vh !important;
}

.preview-modal .modal-content {
    padding: 20px;
    text-align: center;
}

.preview-modal .modal-content h4 {
    font-family: 'Google Sans Display', sans-serif;
    font-size: 1.5rem;
    margin-bottom: 20px;
    font-weight: 400;
}

.preview-modal img,
.preview-modal video {
    max-width: 100%;
    max-height: 70vh;
    object-fit: contain;
    border-radius: var(--border-radius);
    margin-bottom: 16px;
}

.preview-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    color: var(--primary-color);
    cursor: pointer;
    font-size: 0.875rem;
}

.preview-button i {
    font-size: 20px;
}

.file-info {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 4px;
}