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

:root {
    --primary-color: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #4338ca;
    --accent-color: #f97316;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-light: #f9fafb;
    --bg-dark: #1e293b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --transition: all 0.3s ease;
    --max-width: 1200px;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* 导航栏样式 */
.navbar {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 0;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link.highlight {
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-md);
    padding: 0.5rem 1rem;
}

.nav-link.highlight:hover {
    background-color: var(--primary-color);
    color: white;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    padding: 5rem 0 0;
    position: relative;
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 3rem;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #ffffff, #e0e7ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transform: perspective(1000px) rotateY(-10deg);
    transition: var(--transition);
}

.hero-image:hover img {
    transform: perspective(1000px) rotateY(-5deg) translateY(-10px);
}

.wave-divider {
    position: relative;
    width: 100%;
    height: 100px;
    margin-top: -1px;
}

.wave-divider.flip {
    transform: rotate(180deg);
    margin-bottom: -1px;
}

.wave-divider svg {
    position: absolute;
    width: 100%;
    height: 100px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    border: none;
    outline: none;
    background-color: var(--primary-color);
    color: white;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background-color: var(--primary-dark);
}

.btn:active {
    transform: translateY(0);
}

.btn i {
    font-size: 1.1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.btn-outline {
    background: transparent;
    border: 2px solid white;
    color: white;
}

.btn-outline:hover {
    background-color: white;
    color: var(--primary-color);
}

.btn:disabled {
    background-color: var(--text-light);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* 特性区域 */
.features {
    padding: 5rem 0;
    background-color: var(--bg-color);
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-color);
    margin-bottom: 1rem;
    position: relative;
}

.section-header h2::after {
    content: '';
    position: absolute;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

.section-header p {
    font-size: 1.25rem;
    color: var(--text-light);
}

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

.feature-card {
    background-color: var(--bg-light);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
}

.feature-icon i {
    font-size: 1.75rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* 使用步骤 */
.how-it-works {
    padding: 5rem 0;
    background-color: var(--bg-light);
    position: relative;
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    max-width: 800px;
    margin: 0 auto;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 2rem;
    position: relative;
}

.step:not(:last-child)::after {
    content: '';
    position: absolute;
    width: 2px;
    background-color: var(--primary-light);
    top: 50px;
    bottom: -40px;
    left: 30px;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.step-content p {
    color: var(--text-light);
    font-size: 1.1rem;
}

/* 主要内容区域 */
.main-content {
    padding: 5rem 0;
    background-color: var(--bg-color);
}

.card {
    background-color: white;
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.card-header {
    padding: 1.5rem 2rem;
    background: linear-gradient(to right, var(--primary-color), var(--primary-dark));
    color: white;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.card-header i {
    font-size: 1.5rem;
}

.card-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.card-body {
    padding: 2rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

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

.input-icon {
    position: relative;
}

.input-icon i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

.form-group input, .form-group select {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--bg-light);
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.file-upload {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    background-color: var(--bg-light);
}

.file-upload:hover {
    border-color: var(--primary-color);
    background-color: rgba(79, 70, 229, 0.05);
}

.file-upload.dragover {
    border-color: var(--primary-color);
    background-color: rgba(79, 70, 229, 0.1);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-content i {
    font-size: 3rem;
    color: var(--primary-color);
}

.upload-hint {
    color: var(--text-light);
    font-size: 0.9rem;
}

.sheet-selector {
    margin: 1.5rem 0;
    padding: 1rem;
    background-color: var(--bg-light);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.sheet-selector h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sheet-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.sheet-item {
    background-color: var(--bg-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.sheet-item:hover {
    background-color: rgba(79, 70, 229, 0.05);
}

.sheet-item.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.preview-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    overflow: hidden;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.preview-table th, .preview-table td {
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    text-align: left;
}

.preview-table th {
    background-color: var(--bg-light);
    font-weight: 600;
    color: var(--text-color);
    position: sticky;
    top: 0;
    z-index: 1;
}

.preview-table tr:nth-child(even) {
    background-color: var(--bg-light);
}

.loading {
    display: none;
}

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

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(79, 70, 229, 0.1);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 2rem;
}

.loading-hint {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

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

.report {
    display: none;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.report-content {
    line-height: 1.8;
    font-size: 1.1rem;
}

.report-content h2, .report-content h3 {
    margin: 1.5rem 0 1rem;
    color: var(--text-color);
    font-weight: 700;
}

.report-content h2 {
    font-size: 1.75rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.report-content h3 {
    font-size: 1.4rem;
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem;
}

.report-content p {
    margin-bottom: 1rem;
}

.report-content ul, .report-content ol {
    margin: 1rem 0 1rem 2rem;
}

.report-content li {
    margin-bottom: 0.5rem;
}

.report-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    overflow: hidden;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.chart-container {
    margin: 2rem 0;
    padding: 1.5rem;
    background-color: var(--bg-light);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.chart-container h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
    color: var(--text-color);
    text-align: center;
}

.status {
    padding: 1rem;
    border-radius: var(--radius-md);
    margin: 1rem 0;
    display: none;
    font-weight: 500;
}

.status.success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.status.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* 自定义告示栏样式 */
.custom-notice {
    margin-top: 2rem;
    padding: 1rem 1.5rem;
    background-color: #fff8e1;
    border: 1px solid #ffecb3;
    border-radius: var(--radius-md);
    color: #795548;
    font-size: 1rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}
.custom-notice span {
    color: var(--primary-color);
    font-weight: 600;
    cursor: default;
}
.custom-notice:hover {
    box-shadow: var(--shadow-md);
}

/* 客户评价 */
.testimonials {
    padding: 5rem 0;
    background-color: var(--bg-light);
    position: relative;
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background-color: white;
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.testimonial-content {
    margin-bottom: 1.5rem;
    position: relative;
}

.testimonial-content::before {
    content: '"';
    font-size: 4rem;
    color: var(--primary-light);
    opacity: 0.2;
    position: absolute;
    top: -1.5rem;
    left: -0.5rem;
    font-family: serif;
}

.testimonial-content p {
    font-size: 1.1rem;
    color: var(--text-color);
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.testimonial-author img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.testimonial-author h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-color);
}

.testimonial-author p {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* 页脚 */
.footer {
    background-color: var(--bg-dark);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    flex: 1;
    min-width: 200px;
}

.footer-logo h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 1rem 0 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-logo i {
    font-size: 1.5rem;
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1rem;
}

.footer-links {
    flex: 2;
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-col {
    flex: 1;
    min-width: 150px;
}

.footer-col h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: white;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 0.75rem;
}

.footer-col a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-col a:hover {
    color: white;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 1.2rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: white;
    transform: translateY(-3px);
}

/* 动画 */
.animate-fade-in {
    animation: fadeIn 1s ease forwards;
    opacity: 0;
}

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

.animate-fade-in:nth-child(1) { animation-delay: 0.1s; }
.animate-fade-in:nth-child(2) { animation-delay: 0.3s; }
.animate-fade-in:nth-child(3) { animation-delay: 0.5s; }

/* 响应式设计 */
@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-image {
        margin-top: 2rem;
    }
    
    .hero-image img {
        transform: none;
        max-width: 90%;
    }
    
    .hero-image:hover img {
        transform: translateY(-10px);
    }
    
    .footer-content {
        flex-direction: column;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .feature-grid, .testimonial-grid {
        grid-template-columns: 1fr;
    }
    
    .step {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .step:not(:last-child)::after {
        display: none;
    }
    
    .step-content {
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 576px) {
    .card-body {
        padding: 1.5rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .preview-table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}