.back-btn,
.modal-btn {
    transition: background-color .3s
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box
}

body {
    font-family: Arial, sans-serif;
    background: linear-gradient(to bottom, #fff5f7, #fff);
    color: #333;
    overflow-x: hidden;
    max-width: 100%;
    background-image: url("../thumb/QUYE2045.webp");
    backdrop-filter: blur(10px)
}

.album-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 18px;
    padding: 32px 0 24px;
    background: rgba(255, 245, 247, .92);
    border-radius: 32px;
    box-shadow: 0 8px 32px rgba(233, 30, 99, .1), 0 0 0 8px #fff6fa;
    position: relative;
    margin: 32px auto 0;
    max-width: 900px;
    border: 4px double #e04848;
    overflow: visible
}

#back-to-top,
.back-btn {
    background-color: #ff5a5f
}

.album-header .bear {
    width: 80px;
    height: 80px;
    object-fit: contain;
    animation: 1.2s infinite alternate bear-dance;
    z-index: 2;
    filter: drop-shadow(0 2px 8px #e0484880)
}

.album-header .bear-left {
    margin-left: -30px;
    animation-delay: .2s
}

.album-header .bear-right {
    margin-right: -30px;
    transform: scaleX(-1)
}

@keyframes bear-dance {
    0% {
        transform: translateY(0) scale(1)
    }

    100% {
        transform: translateY(-18px) scale(1.08)
    }
}

.album-header .header-content {
    flex: 1;
    text-align: center;
    position: relative;
    z-index: 3
}

.album-header h1 {
    font-family: 'Dancing Script', Pacifico, 'Great Vibes', cursive, serif;
    font-size: 3.2rem;
    color: #fff;
    text-shadow: 2px 4px 12px #e04848, 0 2px 0 #fff, 0 0 12px #e0484880;
    margin-bottom: 10px;
    letter-spacing: 2px;
    line-height: 1.1;
    background: linear-gradient(90deg, #e04848 40%, #ffb6c1 100%);
    -webkit-text-fill-color: transparent;
    position: relative;
    display: inline-block;
    padding: 8px 64px;
    border-radius: 18px;
    border: 3px solid #fff;
    box-shadow: 0 2px 12px #e0484880;
    min-width: 340px;
    max-width: 100vw;
    width: auto;
    text-align: center
}

.album-header .header-title-main {
    font-size: 1.2em;
    font-family: 'Dancing Script', Pacifico, cursive, serif;
    font-weight: 700;
    letter-spacing: 2px
}

.album-header .header-title-sub {
    display: block;
    font-size: .7em;
    font-family: 'Great Vibes', 'Dancing Script', cursive, serif;
    color: #e04848;
    margin-top: 2px;
    letter-spacing: 1px
}

.album-header p {
    font-size: 2.5rem;
    color: #e04848;
    margin-top: 8px;
    font-family: Quicksand, Arial, sans-serif;
    text-shadow: 0 1px 8px #fff, 0 0 8px #e0484880
}

.album-header .back-btn {
    margin-bottom: 18px;
    font-size: 2.1rem;
    border-radius: 18px;
    background: linear-gradient(90deg, #e04848 60%, #ffb6c1 100%);
    border: 2px solid #fff;
    color: #fff;
    box-shadow: 0 2px 8px #e0484880;
    font-family: Quicksand, Arial, sans-serif;
    padding: 8px 22px;
    transition: background .3s, transform .2s
}

.album-header .back-btn:hover {
    background: linear-gradient(90deg, #ffb6c1 60%, #e04848 100%);
    transform: scale(1.06)
}

@media (max-width:700px) {
    .album-header {
        flex-direction: column;
        gap: 0;
        padding: 18px 0 10px;
        border-radius: 18px
    }

    .album-header .bear {
        width: 56px;
        height: 56px;
        margin: 0 !important
    }

    .album-header h1 {
        font-size: 2.1rem;
        padding: 6px 10px
    }
}

.back-btn {
    display: inline-block;
    padding: 10px 20px;
    font-size: 1rem;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    margin-bottom: 15px
}

.back-btn:hover {
    background-color: #e04848
}

.separator {
    border: none;
    border-top: 2px solid #ccc;
    margin: 10px 0 20px
}

.gallery-section {
    width: 100%;
    margin: 0 auto 30px
}

.gallery {
    column-count: 3;
    column-gap: 30px
}

.gallery-item {
    break-inside: avoid;
    margin-bottom: 20px
}

.gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 10px;
    transition: transform .3s
}

.gallery-item img:hover {
    transform: scale(1.05)
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 99vw;
    height: 100vh;
    background-color: rgba(255, 238, 242, .95);
    justify-content: center;
    align-items: center;
    z-index: 1000;
    overflow: auto
}

.modal .close,
.modal-btn {
    position: absolute;
    background-color: rgba(0, 0, 0, .5);
    color: #fff;
    font-size: 2rem;
    cursor: pointer
}

.modal img {
    max-width: 90vw;
    max-height: 100vh;
    border-radius: 10px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, .2)
}

.modal .close {
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    border-radius: 70%;
    transition: background-color .3s, transform .3s, box-shadow .3s;
    box-shadow: 0 2px 8px rgba(0, 0, 0, .4)
}

.modal .close:hover {
    background-color: rgba(240, 22, 156, .8);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, .6)
}

.modal-btn {
    top: 50%;
    transform: translateY(-50%);
    border: none;
    padding: 10px;
    border-radius: 50%;
    z-index: 1001
}

.modal-btn:hover {
    background-color: rgba(0, 0, 0, .8)
}

.modal-btn.prev {
    left: 20px
}

.modal-btn.next {
    right: 20px
}

@media (max-width:900px) {
    .gallery {
        column-count: 3
    }
}

@media (max-width:600px) {
    .gallery {
        column-count: 2
    }
}

.cute-div {
    margin: 20px auto;
    padding: 15px;
    width: 100%;
    max-width: 800px;
    background: linear-gradient(135deg, #ff9a9e 0, #fad0c4 100%);
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, .1);
    text-align: center;
    font-size: 1.2rem;
    color: #fff;
    font-family: 'Comic Sans MS', cursive, sans-serif
}

#back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    transform: translateX(0);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    font-size: 2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity .5s, background-color .3s;
    z-index: 1002
}

#back-to-top.show {
    opacity: 1;
    pointer-events: auto
}