:root {
    --primary-color: #2ecc71;
    --primary-dark: rgb(110, 196, 12);
    --bg-color: rgb(13, 15, 17);
    --card-bg: rgba(30, 35, 50, 0.8);
    --card-hover: rgba(50, 55, 70, 0.9);
    --text-color: white;
    --text-secondary: #aaa;
    --accent-gradient: linear-gradient(to right, rgb(181, 230, 119), rgb(104, 180, 5));
    --cta-gradient: linear-gradient(135deg, #D6FB72 0%, #76F9B1 100%);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.main-top, .main-content {
    max-width: 1200px;
    margin: 0 auto 50px;
    padding: 20px;
    text-align: center;
}

.main-content {
    background-color: var(--card-bg);
    border-radius: 15px;
}

h1 {
    font-size: clamp(28px, 5vw, 35px);
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 15px;
}

.subtitle {
    margin-bottom: 30px;
    font-size: clamp(18px, 3vw, 25px);
    color: var(--text-color);
}

.upload-area {
    margin: 30px 0;
    padding: 40px 20px;
    border: 2px dashed #555;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(46, 204, 113, 0.05);
}

.upload-btn {
    background: var(--accent-gradient);
    color: #000;
    padding: 12px 80px;
    border: none;
    border-radius: 4px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    margin-top: 10px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(104, 180, 5, 0.3);
}

.file-info {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 20px;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 30px;
    flex-wrap: wrap;
    gap: 15px;
}

.speaker-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* 用户评价区域样式优化 */
.user-reviews-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 30px;
}

.review-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    transition: all 0.3s ease;
    cursor: pointer;
    height: 100%;
}

.review-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    background-color: var(--card-hover);
}

.review-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-size: cover;
    background-position: center;
    margin: 0 auto;
    background-color: #444;
}

.review-content {
    flex: 1;
    text-align: center;
}

.review-stars {
    color: #f1c40f;
    margin-bottom: 10px;
    font-size: 18px;
}

.review-text {
    margin-bottom: 10px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.reviewer-info {
    color: var(--text-secondary);
    font-size: 14px;
}

/* 常见问题样式优化 */
.faq-section h2 {
    color: var(--text-color);
    text-align: center;
    margin-bottom: 30px;
    font-size: 24px;
}

.faq-item {
    margin-bottom: 15px;
    border-bottom: 1px solid #555;
    padding-bottom: 15px;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    color: var(--primary-color);
    padding: 10px 0;
}

.faq-toggle {
    transition: transform 0.3s ease;
}

.faq-question.active .faq-toggle {
    transform: rotate(180deg);
}

.faq-answer {
    margin-top: 10px;
    color: var(--text-color);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    text-align: left;
}

.faq-answer.active {
    max-height: 500px;
    padding-bottom: 10px;
}

/* 其他样式 */
.steps-container,
.testimonials-container {
    display: flex;
    justify-content: space-between;
    margin: 40px 0;
    flex-wrap: wrap;
    gap: 20px;
}

.reasons-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 40px 0;
}

.step-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    flex: 1;
    min-width: 250px;
}

.step-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    background-color: var(--card-hover);
}

.step-icon {
    font-size: 48px;
    color: #3498db;
    margin-bottom: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 80px;
}

.step-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 15px;
}

.step-number-circle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-weight: bold;
}

.testimonial-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    width: 30%;
    margin-bottom: 20px;
    text-align: center;
}

.reason-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    text-align: left;
    transition: all 0.3s ease;
    cursor: pointer;
}

.reason-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    background-color: var(--card-hover);
}

.reason-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.reason-icon {
    font-size: 24px;
    color: var(--primary-color);
}

.step-number {
    font-size: 18px;
    font-weight: bold;
    color: white;
    margin-bottom: 10px;
}

.rating {
    color: #f1c40f;
    margin-bottom: 10px;
}

.promo-section {
    background: linear-gradient(135deg, rgba(100, 200, 255, 0.2), rgba(150, 220, 255, 0.3));
    padding: 40px;
    text-align: center;
    border-radius: 8px;
    margin-top: 40px;
    box-shadow: 0 4px 15px rgba(100, 200, 255, 0.2);
}

.promo-logo {
    font-size: 48px;
    color: #3498db;
    margin-bottom: 20px;
}

.cta-button {
    background-color: var(--primary-color);
    color: white;
    padding: 12px 30px;
    border: none;
    border-radius: 4px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    margin-top: 20px;
    transition: all 0.3s ease;
}

.cta-button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(46, 204, 113, 0.3);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-top, .main-content {
        padding: 15px;
    }
    
    .steps-container {
        flex-direction: column;
    }
    
    .step-card {
        width: 100%;
    }
    
    .controls {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .user-reviews-grid {
        grid-template-columns: 1fr;
    }
    
    .review-card {
        flex-direction: column;
        text-align: center;
    }
    
    .review-avatar {
        margin: 0 auto;
    }
}

/* 超大屏幕优化 */
@media (min-width: 1920px) {
    .user-reviews-grid {
        gap: 50px;
    }
}

.cta-section {
    background: var(--cta-gradient);
    padding: 2rem;
    border-radius: 0.5rem;
    margin-top: 3rem;
    text-align: center;
}

.cta-title {
    color: #2D2D33;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.cta-text {
    color: #2D2D33;
    margin-bottom: 1.5rem;
}

.cta-button-dark {
    background: #2D2D33;
    color: white;
    border: none;
    border-radius: 0.5rem;
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.cta-button-dark:hover {
    background: #1E1E1E;
    transform: translateY(-2px);
}

/* 加载优化 */
.lazy-load {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-load.loaded {
    opacity: 1;
}

/* 无障碍优化 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 焦点可见性 */
button:focus-visible,
.faq-question:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}