/**
 * 3D翻转卡片样式
 * 应用到攻略书、城市卡片等
 */

.flip-card-container {
    perspective: 1000px;
    height: 100%;
}

.flip-card {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
}

.flip-card-container:hover .flip-card {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 20px;
    padding: 24px;
}

.flip-card-front {
    background: linear-gradient(135deg, rgba(30, 50, 40, 0.6), rgba(20, 40, 35, 0.4));
    border: 2px solid rgba(46, 204, 113, 0.2);
}

.flip-card-back {
    background: linear-gradient(135deg, #2ecc71, #3498db);
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
}

.flip-card-back h3 {
    font-size: 24px;
    margin-bottom: 16px;
    font-weight: 700;
}

.flip-card-back p {
    font-size: 14px;
    opacity: 0.9;
    line-height: 1.6;
    margin-bottom: 20px;
}

.flip-card-back .btn {
    padding: 12px 32px;
    background: white;
    color: #2ecc71;
    border: none;
    border-radius: 10px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
}

.flip-card-back .btn:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}

/* 翻转提示 */
.flip-hint {
    position: absolute;
    bottom: 12px;
    right: 12px;
    font-size: 11px;
    color: rgba(255,255,255,0.4);
    opacity: 1;
    transition: opacity 0.3s;
}

.flip-card-container:hover .flip-hint {
    opacity: 0;
}

/* 移动端优化 */
@media (max-width: 768px) {
    .flip-card-container {
        perspective: 800px;
    }
}