/* 期卷列表页样式 - 精美设计 */

.issue-list-container {
    padding: 20px 0;
    max-width: 1600px;
    margin: 0 auto;
}

/* 页面标题 */
.archives-title {
    font-size: 44px;
    font-weight: 700;
    color: #002b5c;
    margin-bottom: 55px;
    text-align: center;
    letter-spacing: -0.8px;
    position: relative;
    padding-bottom: 22px;
}

.archives-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 90px;
    height: 4px;
    background: linear-gradient(90deg, #c42021 0%, #e63946 100%);
    border-radius: 2px;
}

/* Volume 分组 */
.volume-section {
    margin-bottom: 65px;
}

.volume-title {
    font-size: 34px;
    font-weight: 700;
    color: #002b5c;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 2px solid #f0f0f0;
    position: relative;
    letter-spacing: -0.3px;
}

.volume-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 75px;
    height: 2px;
    background: linear-gradient(90deg, #c42021 0%, #e63946 100%);
}

/* 期卷网格 - 4列布局 */
.issues-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 55px;
}

/* 期卷卡片 - 精美设计 */
.issue-card {
    background: #fff;
    border-radius: 14px;
    overflow: hidden;
    transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
    border: 1px solid #f5f5f5;
    position: relative;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.issue-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    opacity: 0;
    transition: opacity 0.35s ease;
    z-index: 1;
}

.issue-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.12);
    border-color: #e8e8e8;
}

.issue-card:hover::before {
    opacity: 1;
}

.issue-link {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    height: 100%;
}

/* 封面图片 - 适中高度 */
.issue-cover {
    width: 100%;
    height: 320px;
    overflow: hidden;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    position: relative;
    flex-shrink: 0;
}

.issue-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.issue-card:hover .issue-cover img {
    transform: scale(1.08);
}

/* 封面占位符 - 精美设计 */
.issue-cover-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    position: relative;
    overflow: hidden;
}

.issue-cover-placeholder::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.12) 0%, transparent 70%);
    animation: shimmer 4s infinite linear;
}

.issue-cover-placeholder::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.08) 50%, transparent 70%);
    animation: shine 3s infinite;
}

@keyframes shimmer {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

@keyframes shine {
    0% {
        transform: translateX(-100%) translateY(-100%);
    }
    100% {
        transform: translateX(100%) translateY(100%);
    }
}

.placeholder-content {
    text-align: center;
    color: #fff;
    z-index: 1;
    position: relative;
}

.placeholder-content span {
    display: block;
    font-size: 20px;
    font-weight: 700;
    margin: 8px 0;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
    letter-spacing: 1.2px;
}

/* 期卷信息 - 精美设计 */
.issue-info {
    padding: 22px 20px;
    background: #fff;
    border-top: 1px solid #f8f8f8;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.issue-date {
    font-size: 15px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 7px;
    line-height: 1.5;
    letter-spacing: 0.1px;
}

.issue-volume-number {
    font-size: 13px;
    color: #666;
    margin: 0;
    line-height: 1.5;
    font-weight: 500;
    letter-spacing: 0.2px;
}

/* 无期卷提示 */
.no-issues-message {
    text-align: center;
    padding: 90px 20px;
    color: #666;
    font-size: 17px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 14px;
    margin-top: 45px;
    border: 1px solid #e8e8e8;
}

/* 响应式设计 */
@media (max-width: 1400px) {
    .issues-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 22px;
    }
    
    .issue-cover {
        height: 300px;
    }
}

@media (max-width: 992px) {
    .issue-list-container {
        padding: 40px 15px 60px;
    }
    
    .archives-title {
        font-size: 36px;
        margin-bottom: 45px;
        padding-bottom: 18px;
    }
    
    .archives-title::after {
        width: 75px;
        height: 3px;
    }
    
    .volume-title {
        font-size: 28px;
        margin-bottom: 28px;
        padding-bottom: 14px;
    }
    
    .volume-title::after {
        width: 65px;
    }
    
    .issues-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 22px;
    }
    
    .issue-cover {
        height: 580px;
    }
    
    .issue-info {
        padding: 20px 18px;
    }
}

@media (max-width: 768px) {
    .issue-list-container {
        padding: 20px ;
    }
    
    .archives-title {
        font-size: 30px;
        margin-bottom: 38px;
        padding-bottom: 16px;
        letter-spacing: -0.5px;
    }
    
    .archives-title::after {
        width: 65px;
        height: 3px;
    }
    
    .volume-section {
        margin-bottom: 48px;
    }
    
    .volume-title {
        font-size: 24px;
        margin-bottom: 22px;
        padding-bottom: 12px;
    }
    
    .volume-title::after {
        width: 55px;
        height: 2px;
    }
    
    .issues-grid {
        grid-template-columns: 1fr;
        gap: 22px;
        margin-bottom: 48px;
    }
    
    /* 手机端图片高度增加 */
    .issue-cover {
        height: 580px;
    }
    
    .issue-info {
        padding: 20px;
    }
    
    .issue-date {
        font-size: 15px;
        margin-bottom: 6px;
    }
    
    .issue-volume-number {
        font-size: 13px;
    }
    
    .placeholder-content span {
        font-size: 19px;
        margin: 7px 0;
    }
}