.o-case-grid {
    margin: 0 -16px;
}

.o-case-col {
    padding: 0 16px;
    margin-bottom: 40px;
}

/* 大卡片设计 */
.o-case-card {
    background: #fff;
    border-radius: 28px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.5s cubic-bezier(0.2, 0, 0, 1);
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.06);
}

.o-case-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 32px 56px rgba(0, 0, 0, 0.12);
}

/* 大图区域 */
.o-case-img-wrapper {
    position: relative;
    overflow: hidden;
    background: #1a1a2e;
}

.o-case-img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    display: block;
    transition: transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.o-case-card:hover .o-case-img {
    transform: scale(1.06);
}

/* 色块标签 - 纯色块无图标 */
.o-case-badge {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 8px 20px;
    border-radius: 30px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: #fff;
    z-index: 2;
}

.o-case-badge.school {
    background: #d4a373;
}

.o-case-badge.university {
    background: #2d6a4f;
}

.o-case-badge.online {
    background: #1a73e8;
}

/* 信息区域 */
.o-case-info {
    padding: 28px 28px 32px;
}

.o-case-title {
    font-size: 22px;
    font-weight: 700;
    color: #1a1a2e;
    line-height: 1.35;
    margin-bottom: 14px;
    letter-spacing: -0.2px;
}

.o-case-desc {
    font-size: 15px;
    color: #555;
    line-height: 1.65;
    margin-bottom: 24px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.o-case-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.o-case-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.o-case-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    background: #f0f0f0;
}

.o-case-nickname {
    font-size: 14px;
    color: #666;
    font-weight: 500;
}

.o-case-date {
    font-size: 13px;
    color: #999;
}

/* 标题区 - 纯文字无装饰 */
.o-section-title {
    text-align: center;
    margin-bottom: 40px;
}

.o-section-title h2 {
    font-size: 32px;
    font-weight: 700;
    color: #1a1a2e;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
}

.o-section-title p {
    font-size: 16px;
    color: #888;
}

/* 全屏遮罩层 */
.o-fs-mask {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000;
    z-index: 10001;
    display: none;
    align-items: center;
    justify-content: center;
}

.o-fs-mask.active {
    display: flex;
}

.o-fs-img {
    max-width: 92%;
    max-height: 90%;
    object-fit: contain;
    border-radius: 12px;
    animation: fsFadeIn 0.3s ease;
}

@keyframes fsFadeIn {
    0% { opacity: 0; transform: scale(0.96); }
    100% { opacity: 1; transform: scale(1); }
}

.o-fs-close {
    position: absolute;
    top: 30px;
    right: 40px;
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 36px;
    color: #fff;
    opacity: 0.7;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
}

.o-fs-close:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.2);
}

.o-fs-prev, .o-fs-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 44px;
    color: #fff;
    opacity: 0.6;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
}

.o-fs-prev { left: 30px; }
.o-fs-next { right: 30px; }

.o-fs-prev:hover, .o-fs-next:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-50%) scale(1.05);
}

.o-fs-counter {
    position: absolute;
    bottom: 30px;
    left: 0;
    right: 0;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

.o-fs-title {
    position: absolute;
    bottom: 75px;
    left: 0;
    right: 0;
    text-align: center;
    color: #fff;
    font-size: 18px;
    font-weight: 500;
    max-width: 80%;
    margin: 0 auto;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}