main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 100px 20px 40px;
    font-family: "SimSun", "STSong", serif;
}

h1 {
    text-align: center;
    color: #5D4037;
    font-size: 36px;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 3px solid #FFD700;
}

section {
    background: white;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

h2 {
    color: #5D4037;
    font-size: 24px;
    margin-bottom: 20px;
    padding-left: 15px;
    border-left: 4px solid #FFD700;
}

h3 {
    color: #5D4037;
    font-size: 18px;
    margin: 25px 0 15px;
}

p {
    color: #666;
    line-height: 1.8;
    margin-bottom: 15px;
    font-size: 16px;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    padding: 10px 0;
    color: #666;
    font-size: 16px;
}

li strong {
    color: #5D4037;
}

a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.highlight {
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.1), rgba(255, 165, 0, 0.1));
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    color: #5D4037;
    font-weight: bold;
}

.form-group input,
.form-group textarea {
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #FFD700;
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.submit-btn {
    background: linear-gradient(135deg, #5D4037, #3E2723);
    color: #FFD700;
    padding: 15px 30px;
    border: none;
    border-radius: 10px;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.3s;
    font-family: "SimSun", "STSong", serif;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(93, 64, 55, 0.4);
}

.tang-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: linear-gradient(135deg, #8B4513 0%, #A0522D 50%, #8B4513 100%);
    border-top: 4px solid #FFD700;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
    padding: 8px 0;
}

.bottom-nav-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 10px;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px 10px;
    color: #FFD700;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 215, 0, 0.3);
    position: relative;
    overflow: hidden;
    font-family: "SimSun", "STSong", serif;
}

.nav-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.nav-item:hover::before {
    left: 100%;
}

.nav-item:hover {
    background: linear-gradient(135deg, #DAA520, #FFD700);
    color: #5D4037;
    border-color: #FFD700;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.4);
}

.nav-item.active {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: #5D4037;
    border-color: #FFD700;
}

.nav-icon {
    font-size: 18px;
    margin-bottom: 2px;
}

.nav-text {
    font-size: 11px;
    font-weight: 500;
    white-space: nowrap;
}

#notification {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.notification {
    padding: 15px 25px;
    border-radius: 10px;
    color: white;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideIn 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.notification.success {
    background: linear-gradient(135deg, #27ae60, #2ecc71);
}

.notification.error {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
}

.notification button {
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.scroll-to-top {
    position: fixed;
    bottom: 80px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #5D4037, #3E2723);
    color: #FFD700;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 24px;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    z-index: 999;
}

.scroll-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(93, 64, 55, 0.4);
}

.scroll-to-top.show {
    display: flex;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 28px;
    }
    
    h2 {
        font-size: 20px;
    }
    
    section {
        padding: 20px;
    }
    
    main {
        padding-bottom: 80px;
    }
    
    #notification {
        top: 10px;
        right: 10px;
        left: 10px;
    }
    
    .scroll-to-top {
        bottom: 70px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
}