/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-gradient: linear-gradient(135deg, #5b6cdb 0%, #4a5fc1 100%);
    --secondary-gradient: linear-gradient(135deg, #58b3d9 0%, #5dade2 100%);
    --success-color: #58b3d9;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c9a;
    --border-color: #d4dae6;
    --bg-light: #ebedf7;
    --shadow-sm: 0 1px 2px 0 rgba(91, 108, 219, 0.08);
    --shadow-md: 0 4px 6px -1px rgba(91, 108, 219, 0.12);
    --shadow-lg: 0 10px 15px -3px rgba(91, 108, 219, 0.15);
    --shadow-xl: 0 20px 25px -5px rgba(91, 108, 219, 0.18);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
        'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #f5f0ff 0%, #e8f4ff 50%, #f0f7ff 100%);
    min-height: 100vh;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
.header {
    background: white;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: #000000;
}

.logo-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav a:hover,
.nav a.active {
    color: #5b6cdb;
}

.nav a.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-gradient);
    border-radius: 2px;
}

/* 主要内容区 */
.main {
    padding: 3rem 0;
}

/* 英雄区域 */
.hero {
    text-align: center;
    margin-bottom: 3rem;
}

.title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: #000000;
}

.subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 900px;
    margin: 0 auto;
    white-space: nowrap;
}

/* 工作区 */
.workspace {
    background: white;
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--shadow-xl);
    margin-bottom: 4rem;
    position: relative;
}

/* 语言选择器 */
.language-selector {
    display: flex;
    align-items: flex-end;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.lang-group {
    flex: 1;
    min-width: 200px;
}

.lang-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.lang-select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    color: var(--text-primary);
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
}

.lang-select:hover {
    border-color: #5b6cdb;
}

.lang-select:focus {
    border-color: #5b6cdb;
    box-shadow: 0 0 0 3px rgba(91, 108, 219, 0.15);
}

.swap-btn {
    background: var(--bg-light);
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #5b6cdb;
    transition: all 0.3s ease;
}

.swap-btn:hover {
    background: #5b6cdb;
    color: white;
    transform: rotate(180deg);
}

/* 图片区域 */
.image-area {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.upload-section,
.result-section {
    display: flex;
    flex-direction: column;
}

.upload-box,
.result-box {
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    background: var(--bg-light);
}

.upload-box {
    cursor: pointer;
}

.upload-box:hover {
    border-color: #5b6cdb;
    background: linear-gradient(135deg, rgba(91, 108, 219, 0.05) 0%, rgba(74, 95, 193, 0.05) 100%);
}

.upload-box.dragover {
    border-color: #5b6cdb;
    background: linear-gradient(135deg, rgba(91, 108, 219, 0.1) 0%, rgba(74, 95, 193, 0.1) 100%);
    transform: scale(1.02);
}

.upload-content {
    text-align: center;
    padding: 2rem;
}

.upload-icon {
    margin-bottom: 1rem;
    animation: pulse 2s ease-in-out infinite;
}

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

.upload-text {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.preview-container,
.result-container {
    width: 100%;
    height: 100%;
    position: relative;
}

.preview-container img,
.result-container img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 1rem;
}

.remove-btn,
.download-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(0, 0, 0, 0.6);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.remove-btn:hover {
    background: rgba(239, 68, 68, 0.9);
    transform: scale(1.1);
}

.download-btn {
    width: auto;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    background: var(--primary-gradient);
    gap: 0.5rem;
    font-weight: 600;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.result-placeholder {
    text-align: center;
    color: var(--text-secondary);
}

.result-placeholder svg {
    margin-bottom: 1rem;
}

.image-label {
    text-align: center;
    margin-top: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* 操作区域 */
.action-area {
    display: flex;
    justify-content: center;
}

.translate-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 1rem 3rem;
    border-radius: 50px;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.translate-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.translate-btn:active:not(:disabled) {
    transform: translateY(0);
}

.translate-btn:disabled {
    background: var(--border-color);
    cursor: not-allowed;
    box-shadow: none;
}

/* 加载动画 */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 24px;
    z-index: 10;
}

.loading-spinner {
    text-align: center;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-color);
    border-top: 4px solid #5b6cdb;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-spinner p {
    color: var(--text-secondary);
    font-weight: 600;
}

/* 功能特点 */
.features {
    margin-top: 6rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 页脚 */
.footer {
    background: #1e3a5f;
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer .container {
    text-align: center;
    color: #ffffff;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .workspace {
        padding: 1.5rem;
    }

    .image-area {
        grid-template-columns: 1fr;
    }

    .language-selector {
        flex-direction: column;
        align-items: stretch;
    }

    .swap-btn {
        transform: rotate(90deg);
    }

    .swap-btn:hover {
        transform: rotate(270deg);
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .nav {
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }

    .upload-box,
    .result-box {
        min-height: 300px;
    }

    .translate-btn {
        width: 100%;
        justify-content: center;
    }
}