* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: #2d3436;
    background: #f8f9fa;
}

.hc-top-header {
    background: linear-gradient(135deg, #2d3436 0%, #636e72 100%);
    color: white;
    padding: 1.2rem 0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    position: sticky;
    top: 0;
    z-index: 3000;
}

.hc-nav-wrapper {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
}

.hc-logo-link {
    font-size: 2.2rem;
    font-weight: bold;
    text-decoration: none;
    color: white;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hc-logo-link:hover {
    transform: scale(1.05);
    text-shadow: 3px 3px 6px rgba(0,0,0,0.4);
}

.hc-menu-list {
    display: flex;
    list-style: none;
    gap: 3rem;
}

.hc-menu-list a {
    color: white;
    text-decoration: none;
    transition: all 0.3s;
    font-weight: 500;
    font-size: 1.1rem;
    position: relative;
    padding-bottom: 5px;
}

.hc-menu-list a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: #00b894;
    transition: all 0.3s;
    transform: translateX(-50%);
}

.hc-menu-list a:hover::before {
    width: 100%;
}

.hc-banner-area {
    background: linear-gradient(135deg, #00b894 0%, #00cec9 100%);
    padding: 5rem 0;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.hc-banner-area::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(255,255,255,0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hc-banner-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    position: relative;
    z-index: 1;
}

.hc-main-title {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    text-shadow: 3px 3px 8px rgba(0,0,0,0.3);
    animation: slideDown 1s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hc-subtitle {
    font-size: 1.5rem;
    opacity: 0.95;
    animation: slideUp 1s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hc-main-wrapper {
    max-width: 1400px;
    margin: 3rem auto;
    padding: 0 40px;
}

.hc-section-box {
    background: white;
    border-radius: 20px;
    padding: 3rem;
    margin-bottom: 3rem;
    box-shadow: 0 8px 30px rgba(0,0,0,0.08);
    transition: all 0.3s;
}

.hc-section-box:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.12);
}

.hc-section-heading {
    font-size: 2.5rem;
    color: #2d3436;
    margin-bottom: 2.5rem;
    padding-bottom: 1.2rem;
    border-bottom: 4px solid #00b894;
    position: relative;
}

.hc-section-heading::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 120px;
    height: 4px;
    background: #636e72;
}

.hc-video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2.5rem;
    margin-top: 2.5rem;
}

.hc-video-box {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid #f1f3f5;
    cursor: pointer;
}

.hc-video-box:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0,176,148,0.3);
    border-color: #00b894;
}

.hc-video-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform 0.4s;
}

.hc-video-box:hover .hc-video-img {
    transform: scale(1.15);
}

.hc-video-text {
    padding: 1.8rem;
}

.hc-video-name {
    font-size: 1.3rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: #2d3436;
    line-height: 1.4;
}

.hc-video-desc {
    font-size: 1rem;
    color: #636e72;
    line-height: 1.8;
}

.hc-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin-top: 2.5rem;
}

.hc-feature-card {
    text-align: center;
    padding: 2.5rem;
    background: linear-gradient(135deg, #00b894 0%, #00cec9 100%);
    border-radius: 20px;
    color: white;
    transition: all 0.4s;
    box-shadow: 0 8px 25px rgba(0,176,148,0.3);
}

.hc-feature-card:hover {
    transform: translateY(-15px) rotate(-3deg);
    box-shadow: 0 20px 50px rgba(0,176,148,0.5);
}

.hc-feature-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    display: block;
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.2));
}

.hc-feature-name {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: bold;
}

.hc-footer-section {
    background: linear-gradient(135deg, #2d3436 0%, #636e72 100%);
    color: white;
    padding: 4rem 0 2rem;
    margin-top: 5rem;
}

.hc-footer-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.hc-footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.hc-footer-col h3 {
    margin-bottom: 1.5rem;
    color: #00b894;
    font-size: 1.4rem;
}

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

.hc-footer-col a {
    color: #b2bec3;
    text-decoration: none;
    display: block;
    margin-bottom: 0.8rem;
    transition: all 0.3s;
    padding-left: 0;
}

.hc-footer-col a:hover {
    color: white;
    padding-left: 10px;
    text-decoration: underline;
}

.hc-copyright {
    text-align: center;
    padding-top: 2.5rem;
    border-top: 1px solid #636e72;
    color: #b2bec3;
    font-size: 1rem;
}

.hc-category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 2rem;
    margin-top: 2.5rem;
}

.hc-category-item {
    background: linear-gradient(135deg, #636e72 0%, #2d3436 100%);
    color: white;
    padding: 3rem;
    border-radius: 15px;
    text-align: center;
    text-decoration: none;
    transition: all 0.4s;
    font-weight: bold;
    font-size: 1.3rem;
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.hc-category-item:hover {
    transform: scale(1.08) translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,176,148,0.4);
    background: linear-gradient(135deg, #00b894 0%, #00cec9 100%);
}

.hc-paragraph {
    line-height: 2;
    color: #636e72;
    margin-bottom: 2rem;
    text-align: justify;
    font-size: 1.05rem;
}

.hc-display-img {
    width: 100%;
    max-width: 1000px;
    height: auto;
    border-radius: 20px;
    margin: 2.5rem auto;
    display: block;
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
    transition: transform 0.3s;
}

.hc-display-img:hover {
    transform: scale(1.03);
}

.hc-search-container {
    max-width: 800px;
    margin: 3rem auto;
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.hc-search-box {
    flex: 1;
    padding: 1.2rem;
    border: 3px solid #00b894;
    border-radius: 50px;
    font-size: 1.1rem;
    transition: all 0.3s;
}

.hc-search-box:focus {
    outline: none;
    box-shadow: 0 0 20px rgba(0,176,148,0.4);
    border-color: #00cec9;
}

.hc-search-button {
    background: linear-gradient(135deg, #00b894 0%, #00cec9 100%);
    color: white;
    padding: 1.2rem 3rem;
    border: none;
    border-radius: 50px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: bold;
    box-shadow: 0 5px 20px rgba(0,176,148,0.3);
}

.hc-search-button:hover {
    transform: scale(1.08);
    box-shadow: 0 8px 30px rgba(0,176,148,0.5);
}

.hc-tags-area {
    display: flex;
    flex-wrap: wrap;
    gap: 1.2rem;
    margin-top: 2.5rem;
}

.hc-tag {
    background: #f1f3f5;
    padding: 0.8rem 1.8rem;
    border-radius: 30px;
    font-size: 1rem;
    color: #2d3436;
    text-decoration: none;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.hc-tag:hover {
    background: #00b894;
    color: white;
    transform: translateY(-5px);
    border-color: #00b894;
    box-shadow: 0 8px 20px rgba(0,176,148,0.3);
}

@media (max-width: 768px) {
    .hc-menu-list {
        gap: 1.5rem;
        font-size: 0.9rem;
    }

    .hc-main-title {
        font-size: 2.5rem;
    }

    .hc-video-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }

    .hc-section-box {
        padding: 2rem;
    }
}