* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: '微软雅黑', sans-serif;
}

body {
    background: url("../../background.png") no-repeat center center fixed;
    background-size: cover;
    min-height: 100vh;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 50px;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(5px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links li {
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: #2c3e50;
    font-weight: 500;
    padding: 10px 15px;
    border-radius: 5px;
    transition: all 0.3s;
    position: relative;
}

.nav-links a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #3498db;
    transition: width 0.3s;
}

.nav-links a:hover::before {
    width: 100%;
}

.nav-links a:hover {
    color: #3498db;
}

.logo img {
    height: 40px;
    max-width: 180px;
    transition: transform 0.3s;
}

.logo:hover img {
    transform: scale(1.05);
}

.back-button {
    position: absolute;
    left: 50px;
    top: 90px;
    display: flex;
    align-items: center;
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
    padding: 8px 15px;
    border-radius: 20px;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(2px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    z-index: 100;
}

.back-button::before {
    content: '';
    display: block;
    width: 12px;
    height: 12px;
    border-left: 2px solid #3498db;
    border-bottom: 2px solid #3498db;
    transform: rotate(45deg);
    margin-right: 8px;
    transition: all 0.3s;
}

.back-button:hover {
    transform: translateX(-5px);
    background: rgba(255,255,255,1);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.back-button:hover::before {
    border-color: #2980b9;
}

.container {
    width: 85%;
    max-width: 800px;
    margin: 100px auto;
    padding: 40px;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(3px);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    text-align: center;
}

h1 {
    color: #2c3e50;
    margin-bottom: 30px;
    font-size: 2.4em;
}

.month-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 30px 0;
}

.month-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.month-header {
    font-size: 1.2em;
    color: #2c3e50;
    padding: 10px;
    background: rgba(52, 152, 219, 0.1);
    border-radius: 8px;
}

.month-btn {
    padding: 12px 20px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    text-align: center;
    border: 1px solid #0F76A4;
}

.month-btn:hover {
    background: #2980b9;
    box-shadow: 0 4px 12px rgba(52,152,219,0.3);
}

.month-btn.disabled {
    background: #727272;
    color: #e0e0e0;
    border: 1px solid #595959;
    box-shadow: none;
    transform: none !important;
    transition: all 0.3s;
}

.month-btn.disabled:hover {
    cursor: not-allowed;
    background: #909090;
}

.pagination {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
}

.page-btn {
    display: inline-block;
    /*width: 100px;*/
    padding: 15px 15px;
    margin: 10px 0;
    background: #3498db;
    color: white !important;
    border-radius: 25px;
    text-decoration: none;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(52,152,219,0.3);
    border: 1px solid #2980b9;
    font-size: 1em;
    font-weight: bold;
}

.page-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52,152,219,0.4);
}

.unavailable {
    background: #727272;
    border: 1px solid #595959;
    box-shadow: 0 6px 20px rgba(114,114,114,0.3);
}

.unavailable:hover {
    background: #909090;
    cursor: not-allowed;
    box-shadow: 0 6px 20px rgba(114,114,114,0.4);
}

@media (max-width: 768px) {
    .container {
        width: 95%;
        padding: 25px;
    }

    .month-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .back-button {
        left: 20px;
        top: 70px;
    }
}