:root {
    --primary-color: #e02e24;
    --secondary-color: #ff6900;
    --accent-color: #1a73e8;
    --dark-color: #2c3e50;
    --light-gray: #f8f9fa;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.hero-section:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 100" fill="white" opacity="0.1"><polygon points="1000,100 1000,0 0,100"/></svg>');
    background-size: cover;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.feature-card {
    background: white;
    border-radius: 15px;
    padding: 40px 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: none;
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 2rem;
}

.stats-section {
    background: var(--dark-color);
    color: white;
    padding: 80px 0;
}

.stat-item {
    text-align: center;
    margin-bottom: 30px;
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--secondary-color);
    display: block;
}

.contact-section {
    background: var(--light-gray);
    padding: 80px 0;
}

.contact-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    text-align: center;
    transition: all 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-5px);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    color: white;
    font-size: 1.5rem;
}

.form-section {
    padding: 80px 0;
    background: white;
}

.form-container {
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.custom-form .form-control {
    border: 2px solid #e9ecef;
    border-radius: 10px;
    padding: 12px 16px;
    transition: all 0.3s ease;
}

.custom-form .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(224, 46, 36, 0.25);
}

.btn-primary-custom {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 10px;
    padding: 12px 30px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn-primary-custom:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(224, 46, 36, 0.4);
}

.section-title {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 20px;
    position: relative;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.screenshot-placeholder {
    background: #f8f9fa;
    border: 3px dashed #dee2e6;
    border-radius: 15px;
    padding: 60px 20px;
    text-align: center;
    margin: 20px 0;
    transition: all 0.3s ease;
}

.screenshot-placeholder:hover {
    border-color: var(--primary-color);
    background: #fff5f4;
}

.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

.floating-element {
    position: absolute;
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.loading {
    display: none;
}

.success-message {
    display: none;
    background: #d4edda;
    color: #155724;
    padding: 15px;
    border-radius: 10px;
    border: 1px solid #c3e6cb;
}

.error-message {
    display: none;
    background: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: 10px;
    border: 1px solid #f5c6cb;
}

/* 备案信息样式 */
.footer-filing {
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: 1rem;
    padding-top: 0.75rem;
}

.footer-filing a {
    color: #adb5bd !important;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-filing a:hover {
    color: #fff !important;
}

.footer-filing .small {
    font-size: 0.8rem;
    line-height: 1.4;
}

.footer-filing i {
    opacity: 0.7;
}