@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

:root {
    --primary-color: #e63946;
    --primary-dark: #c1121f;
    --primary-light: #f1faee;
    --secondary-color: #a8dadc;
    --text-dark: #1d3557;
    --text-light: #f1faee;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    scroll-behavior: smooth;
}

.charity-red {
    background-color: var(--primary-color);
}

.charity-red-dark {
    background-color: var(--primary-dark);
}

.charity-red-light {
    background-color: var(--primary-light);
}

.text-charity {
    color: var(--primary-color);
}

.text-charity-dark {
    color: var(--text-dark);
}

.text-charity-light {
    color: var(--text-light);
}

.btn-charity {
    background-color: var(--primary-color);
    color: white;
    transition: all 0.3s ease;
}

.btn-charity:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 15px -3px rgba(230, 57, 70, 0.3);
}

.card-charity {
    transition: all 0.3s ease;
    border-radius: 0.5rem;
    overflow: hidden;
}

.card-charity:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.floating {
    animation: floating 3s ease-in-out infinite;
}

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

.wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%23ffffff' fill-opacity='1' d='M0,224L48,213.3C96,203,192,181,288,181.3C384,181,480,203,576,202.7C672,203,768,181,864,181.3C960,181,1056,203,1152,202.7C1248,203,1344,181,1392,170.7L1440,160L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'%3E%3C/path%3E%3C/svg%3E");
    background-size: 1440px 100px;
}

.wave-animation {
    animation: wave 10s linear infinite;
}

@keyframes wave {
    0% { background-position-x: 0; }
    100% { background-position-x: 1440px; }
}

#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.section {
    padding: 6rem 0;
    position: relative;
}

.section-title {
    position: relative;
    display: inline-block;
    margin-bottom: 3rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background-color: var(--primary-color);
}

.case-card {
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.case-card:hover {
    border-left-width: 8px;
    transform: translateX(5px);
}

.form-input {
    border: 1px solid #e2e8f0;
    border-radius: 0.375rem;
    padding: 0.75rem 1rem;
    width: 100%;
    transition: all 0.3s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.2);
}

.social-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

.social-icon:hover {
    color: var(--primary-dark);
    transform: translateY(-3px);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .hero-content {
        text-align: center;
    }

    .section {
        padding: 3rem 0;
    }

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

/* 加载动画 */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--primary-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-icon {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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