:root {
    --primary-dark: #2B2421; /* Đen cafe đậm - Ấm áp, sâu lắng */
    --luxury-amber: #D9A05B; /* Vàng hổ phách - Sang trọng, sinh động */
    --bright-bg: #FFFFFF; /* Nền trắng sáng tinh khiết */
    --soft-sand: #F7F4F0; /* Màu cát mịn nhẹ - Tone gỗ sáng Bắc Âu */
    --text-muted: #8E847E; /* Chữ phụ màu xám đất ấm */
    --font-heading: 'Cormorant Garamond', serif;
    --font-body: 'Be Vietnam Pro', sans-serif;
}

body {
    font-family: var(--font-body);
    background-color: var(--soft-sand);
    color: var(--primary-dark);
    overflow-x: hidden;
    letter-spacing: -0.01em;
    font-size: 0.95rem;
    line-height: 1.6;
}

h1, h2, h3, h4, .section-title, .navbar-brand {
    font-family: var(--font-heading);
    font-weight: 600;
}

/* --- SCROLLBAR --- */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--soft-sand);
}

::-webkit-scrollbar-thumb {
    background: var(--luxury-amber);
    border-radius: 3px;
}

/* --- NAVBAR --- */
.navbar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1050;
    background-color: transparent;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 20px 0;
    transition: all 0.4s ease;
}

    .navbar.scrolled {
        position: fixed;
        background-color: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(217, 160, 91, 0.15);
        padding: 12px 0;
        box-shadow: 0 10px 30px rgba(43,36,33,0.05);
    }

        .navbar.scrolled .nav-link {
            color: var(--primary-dark) !important;
        }

            .navbar.scrolled .nav-link:hover, .navbar.scrolled .nav-link.active {
                color: var(--luxury-amber) !important;
            }

        .navbar.scrolled .navbar-brand span.text-white {
            color: var(--primary-dark) !important;
        }

.nav-link {
    color: rgba(255, 255, 255, 0.95) !important;
    font-weight: 500;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    margin: 0 12px;
    transition: all 0.3s ease;
}

    .nav-link:hover, .nav-link.active {
        color: var(--luxury-amber) !important;
    }

/* --- HERO SLIDESHOW BANNER --- */
.hero-carousel, .carousel-inner, .carousel-item {
    height: 100vh;
    width: 100%;
}

.carousel-item {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
}

    .carousel-item::before {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(180deg, rgba(43, 36, 33, 0.7) 0%, rgba(43, 36, 33, 0.35) 100%);
        z-index: 1;
    }

.carousel-caption-custom {
    position: absolute;
    z-index: 2;
    top: 50%;
    transform: translateY(-50%);
    color: var(--bright-bg);
    width: 100%;
}

.hero-premium h1 {
    font-size: 4.5rem;
    line-height: 1.1;
    font-weight: 500;
    text-shadow: 0 4px 20px rgba(0,0,0,0.25);
}

.hero-tag {
    background: rgba(217, 160, 91, 0.2);
    border: 1px solid rgba(217, 160, 91, 0.6);
    color: #FCD299;
    padding: 5px 15px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 1.5px;
    display: inline-block;
}

.btn-luxury {
    background-color: var(--luxury-amber);
    color: var(--bright-bg);
    font-weight: 500;
    padding: 12px 30px;
    border-radius: 4px;
    border: 1px solid var(--luxury-amber);
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

    .btn-luxury:hover {
        background-color: transparent;
        color: var(--luxury-amber);
        transform: translateY(-2px);
    }

.scroll-down-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.5rem;
    animation: bounce 2s infinite;
    cursor: pointer;
    text-decoration: none;
    z-index: 10;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translate(-50%, 0);
    }

    40% {
        transform: translate(-50%, -10px);
    }

    60% {
        transform: translate(-50%, -5px);
    }
}

/* --- SECTION TITLE --- */
.section-title {
    font-size: 3rem;
    font-weight: 500;
    color: var(--primary-dark);
}

    .section-title span {
        color: var(--luxury-amber);
        font-style: italic;
    }

/* --- KHỐI 1: GALLERY DỰ ÁN TIÊU BIỂU (HIỆU ỨNG TRƯỢT NGANG CHUẨN) --- */
.project-section {
    background-color: var(--soft-sand);
    padding: 90px 0;
    overflow: hidden;
}

.project-filter-btn {
    background: var(--bright-bg);
    border: 1px solid rgba(43, 36, 33, 0.1);
    color: var(--primary-dark);
    padding: 6px 20px;
    border-radius: 4px;
    font-weight: 500;
    font-size: 0.85rem;
    margin: 0 4px 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
    transition: all 0.3s ease;
}

    .project-filter-btn.active, .project-filter-btn:hover {
        background: var(--luxury-amber);
        color: var(--bright-bg);
        border-color: var(--luxury-amber);
        box-shadow: 0 4px 10px rgba(217, 160, 91, 0.25);
    }

.project-swiper {
    width: 100%;
    padding: 20px 5px 50px 5px !important;
}

.project-card {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    height: 400px;
    box-shadow: 0 10px 30px rgba(43,36,33,0.06);
    cursor: pointer;
    transition: transform 0.4s ease;
}

    .project-card img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.6s ease;
    }

.project-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(43, 36, 33, 0.95) 0%, rgba(43, 36, 33, 0) 70%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 25px;
    opacity: 1;
}

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

.project-overlay h5 {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    color: #fff;
    margin-bottom: 2px;
}

.swiper-nav-ctrl {
    width: 44px;
    height: 44px;
    background: var(--bright-bg);
    border: 1px solid rgba(43,36,33,0.1);
    color: var(--primary-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 10px rgba(0,0,0,0.02);
}

    .swiper-nav-ctrl:hover {
        background: var(--luxury-amber);
        color: #fff;
        border-color: var(--luxury-amber);
    }

.swiper-pagination-bullet-active {
    background-color: var(--luxury-amber) !important;
}

/* --- KHỐI 2: TẠI SAO CHỌN TÂM AN --- */
.why-choose-sec {
    background-color: var(--bright-bg);
    color: var(--primary-dark);
    padding: 100px 0;
    position: relative;
}

.why-image-container {
    position: relative;
    padding-bottom: 30px;
    padding-right: 30px;
}

    .why-image-container::before {
        content: '';
        position: absolute;
        right: 0;
        bottom: 0;
        width: 85%;
        height: 85%;
        border: 2px solid var(--luxury-amber);
        border-radius: 12px;
        z-index: 1;
        opacity: 0.35;
    }

.why-main-img {
    width: 100%;
    border-radius: 12px;
    position: relative;
    z-index: 2;
    object-fit: cover;
    height: 480px;
    box-shadow: 0 15px 35px rgba(43,36,33,0.06);
}

.why-floating-badge {
    position: absolute;
    left: -20px;
    bottom: 10px;
    background-color: var(--primary-dark);
    border: 1px solid var(--luxury-amber);
    padding: 15px 25px;
    border-radius: 4px;
    z-index: 3;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

    .why-floating-badge i {
        color: var(--luxury-amber);
        font-size: 1.4rem;
    }

    .why-floating-badge span {
        font-size: 0.75rem;
        font-weight: 600;
        letter-spacing: 1px;
        text-transform: uppercase;
        color: var(--bright-bg);
    }

.why-subtitle {
    color: var(--luxury-amber);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 10px;
}

    .why-subtitle::before {
        content: '';
        width: 30px;
        height: 1px;
        background-color: var(--luxury-amber);
        display: inline-block;
    }

.why-title {
    font-family: var(--font-heading);
    font-size: 3.2rem;
    line-height: 1.15;
    font-weight: 600;
    color: var(--primary-dark);
    margin: 15px 0 25px;
}

.why-desc {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 35px;
}

.why-feature-box {
    background-color: var(--soft-sand);
    border-radius: 8px;
    padding: 22px 25px;
    margin-bottom: 15px;
    display: flex;
    align-items: flex-start;
    gap: 20px;
    border-left: 4px solid transparent;
    box-shadow: 0 4px 15px rgba(0,0,0,0.01);
    transition: all 0.3s ease;
}

    .why-feature-box:hover {
        border-left-color: var(--luxury-amber);
        transform: translateX(5px);
        background-color: var(--bright-bg);
        box-shadow: 0 10px 25px rgba(217,160,91,0.1);
    }

.why-feature-icon {
    background-color: rgba(217, 160, 91, 0.08);
    border: 1px solid rgba(217, 160, 91, 0.2);
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--luxury-amber);
    font-size: 0.85rem;
    margin-top: 2px;
    flex-shrink: 0;
}

.why-feature-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--primary-dark);
    letter-spacing: 0.3px;
    margin-bottom: 5px;
    text-transform: uppercase;
}

.why-feature-desc {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-bottom: 0;
    line-height: 1.5;
}

.why-quote {
    border-left: 3px solid var(--luxury-amber);
    padding-left: 20px;
    margin-top: 35px;
    font-family: var(--font-heading);
    font-style: italic;
    font-size: 1.35rem;
    color: var(--primary-dark);
    line-height: 1.45;
}

/* --- KHỐI 3: QUY TRÌNH GIA CÔNG (TIMELINE DỌC) --- */
.process-section {
    background-color: var(--primary-dark);
    color: var(--bright-bg);
    padding: 100px 0;
}

.modern-process-sec {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 24px;
    padding: 60px 40px;
}

.process-left-sub {
    color: var(--luxury-amber);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

    .process-left-sub::before {
        content: '';
        width: 30px;
        height: 1px;
        background-color: var(--luxury-amber);
        display: inline-block;
    }

.process-left-title {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 600;
    line-height: 1.15;
    color: var(--bright-bg);
    margin-bottom: 25px;
}

.process-left-desc {
    color: rgba(255, 255, 255, 0.65);
    font-weight: 300;
    font-size: 0.95rem;
    margin-bottom: 30px;
}

.process-left-quote {
    border-left: 3px solid var(--luxury-amber);
    padding-left: 20px;
    font-family: var(--font-heading);
    font-style: italic;
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 35px;
    line-height: 1.4;
}

.process-left-img-wrapper {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    height: 280px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
}

    .process-left-img-wrapper img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

.timeline-container {
    position: relative;
    padding-left: 40px;
}

    .timeline-container::before {
        content: '';
        position: absolute;
        left: 17px;
        top: 25px;
        bottom: 25px;
        width: 1px;
        background-color: rgba(255, 255, 255, 0.12);
        z-index: 1;
    }

.timeline-item {
    position: relative;
    padding-bottom: 45px;
}

    .timeline-item:last-child {
        padding-bottom: 0;
    }

.timeline-icon-node {
    position: absolute;
    left: -40px;
    top: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary-dark);
    border: 1px solid var(--luxury-amber);
    color: var(--luxury-amber);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 2;
    transition: all 0.3s ease;
}

.timeline-item:hover .timeline-icon-node {
    background-color: var(--luxury-amber);
    color: var(--primary-dark);
    box-shadow: 0 0 12px rgba(217, 160, 91, 0.4);
}

.timeline-content-box {
    padding-left: 20px;
}

.timeline-node-title {
    font-family: var(--font-body);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--bright-bg);
    margin-bottom: 8px;
    letter-spacing: 0.3px;
}

.timeline-node-desc {
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* --- KHỐI 4: KHU VỰC KÝ KẾT --- */
.signing-section {
    background-color: var(--soft-sand);
    padding: 100px 0;
}

.signing-card {
    background: var(--bright-bg);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(43, 36, 33, 0.05);
    box-shadow: 0 10px 30px rgba(0,0,0,0.02);
    height: 100%;
}

.signing-img-wrapper {
    position: relative;
    height: 250px;
    overflow: hidden;
}

    .signing-img-wrapper img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

.signing-badge {
    position: absolute;
    top: 15px;
    left: 15px;
    background: var(--luxury-amber);
    padding: 4px 14px;
    border-radius: 2px;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--bright-bg);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.signing-card h5 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    color: var(--primary-dark);
}

/* --- KHỐI 5: THÔNG SỐ STATS --- */
.stats-section {
    background-color: var(--bright-bg);
    padding: 80px 0;
    border-bottom: 1px solid rgba(43, 36, 33, 0.05);
}

.stat-box-ultra {
    background: var(--soft-sand);
    border: 1px solid rgba(217, 160, 91, 0.1);
    padding: 35px 20px;
    border-radius: 12px;
    text-align: center;
}

.stat-big {
    font-size: 3.5rem;
    color: var(--primary-dark);
    font-family: var(--font-heading);
    line-height: 1;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.75rem;
    letter-spacing: 1px;
    font-weight: 600;
    color: var(--text-muted);
}

/* --- POPUP MODAL THEO DÕI ALBUM ẢNH --- */
.album-modal .modal-dialog {
    max-width: 95vw;
    width: 1350px;
}

.album-modal .modal-content {
    background-color: #000000;
    border: none;
    border-radius: 4px;
    overflow: hidden;
}

.album-main-zone {
    position: relative;
    background-color: #080808;
    height: 75vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.album-main-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.album-sidebar {
    background-color: #ffffff;
    height: 75vh;
    overflow-y: auto;
    padding: 20px;
}

.sidebar-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: #0d6efd;
    border-bottom: 2px solid #0d6efd;
    padding-bottom: 6px;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.thumb-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.thumb-item {
    aspect-ratio: 4/3;
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s ease;
}

    .thumb-item img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

    .thumb-item.active {
        border-color: #0d6efd;
        box-shadow: 0 0 8px rgba(13, 110, 253, 0.4);
    }

.album-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: none;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    z-index: 5;
    display: flex;
    align-items: center;
    justify-content: center;
}

    .album-nav-btn:hover {
        background: var(--luxury-amber);
        scale: 1.05;
    }

.album-prev {
    left: 20px;
}

.album-next {
    right: 20px;
}

.close-album-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    background: none;
    border: none;
    color: white;
    font-size: 1.6rem;
    z-index: 10;
    opacity: 0.6;
    transition: opacity 0.2s;
}

    .close-album-modal:hover {
        opacity: 1;
    }

@media (max-width: 991px) {
    .album-main-zone {
        height: 50vh;
    }

    .album-sidebar {
        height: auto;
        max-height: 35vh;
    }

    .why-choose-sec, .project-section, .process-section, .signing-section {
        padding: 60px 0;
    }

    .why-title, .process-left-title {
        font-size: 2.2rem;
    }

    .why-main-img {
        height: 350px;
    }

    .timeline-container {
        margin-top: 20px;
    }
}

/* --- FOOTER --- */
.footer-luxury {
    background-color: #191412;
    color: rgba(255,255,255,0.5);
    padding: 70px 0 30px;
}

.footer-link {
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    transition: color 0.3s ease;
}

    .footer-link:hover {
        color: var(--luxury-amber);
    }


/* --- POPUP MODAL THÔNG MINH - SIÊU RỘNG CHUẨN CINEMA --- */
.album-modal .modal-dialog {
    max-width: 98vw; /* Mở rộng tối đa 98% chiều rộng màn hình */
    width: 1650px; /* Giới hạn tối đa cho màn hình lớn UltraWide */
    margin: 1vh auto;
}

.album-modal .modal-content {
    background-color: rgba(15, 15, 15, 0.93) !important; /* Nền tối giảm opacity mịn màng */
    backdrop-filter: blur(15px); /* Hiệu ứng làm mờ nền web phía sau cực sang */
    border: 1px solid rgba(255, 255, 255, 0.15) !important; /* Viền border-secondary nhẹ */
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8);
}

/* Chia lại layout bằng CSS Grid để ép Khung ảnh to nhất có thể và Sidebar nhỏ gọn gọn bên phải */
@media (min-width: 992px) {
    .album-modal .modal-body .row {
        display: flex;
        flex-wrap: nowrap;
        margin: 0;
    }

    /* Khung chứa ảnh chính: Chiếm tới 82% diện tích */
    .album-modal .col-lg-9,
    .album-modal [class*="col-"]:first-child {
        width: 82% !important;
        flex: 0 0 82% !important;
        max-width: 82% !important;
        padding: 0;
    }

    /* Sidebar danh sách ảnh nhỏ: Thu hẹp còn 18% diện tích */
    .album-modal .col-lg-3,
    .album-modal [class*="col-"]:last-child {
        width: 18% !important;
        flex: 0 0 18% !important;
        max-width: 18% !important;
        padding: 0;
    }
}

/* --- KHUNG CHỨA ẢNH CHÍNH (TO HƠN) --- */
.album-main-zone {
    position: relative;
    background-color: rgba(0, 0, 0, 0.3);
    height: 85vh; /* Đẩy chiều cao lên 85% chiều cao màn hình */
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px; /* Tạo khoảng thở vừa phải cho ảnh */
}

.album-main-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain; /* Đảm bảo ảnh không bị méo hay vỡ tỉ lệ */
    filter: drop-shadow(0 15px 30px rgba(0, 0, 0, 0.9));
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- SIDEBAR DANH SÁCH ẢNH NHỎ (CHUYỂN SANG NỀN TỐI) --- */
.album-sidebar {
    background-color: #121212 !important; /* Nền tối đồng bộ text-white */
    height: 85vh; /* Cao bằng khung ảnh */
    overflow-y: auto;
    padding: 25px 15px;
    border-left: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-title {
    font-size: 0.85rem;
    font-weight: 700;
    color: #ffffff !important; /* Chữ trắng */
    border-bottom: 2px solid var(--luxury-amber);
    padding-bottom: 10px;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Tinh chỉnh lưới ảnh nhỏ trong Sidebar */
.thumb-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* Xếp 2 cột ảnh nhỏ */
    gap: 10px;
}

.thumb-item {
    aspect-ratio: 4/3;
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.25s ease;
    opacity: 0.4; /* Để ẩn bớt các ảnh chưa xem */
}

    .thumb-item:hover, .thumb-item.active {
        opacity: 1; /* Sáng bừng lên khi click chọn */
        border-color: var(--luxury-amber) !important; /* Viền vàng hổ phách thương hiệu */
        box-shadow: 0 0 12px rgba(217, 160, 91, 0.5);
        transform: scale(1.02);
    }

/* --- NÚT ĐIỀU HƯỚNG TRÊN KHUNG ẢNH TO --- */
.album-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    width: 55px;
    height: 55px;
    border-radius: 50%;
    font-size: 1.4rem;
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
    z-index: 5;
    display: flex;
    align-items: center;
    justify-content: center;
}

    .album-nav-btn:hover {
        background: var(--luxury-amber);
        border-color: var(--luxury-amber);
        color: #000000; /* Chuyển icon chữ đen trên nền vàng nổi bật */
        transform: translateY(-50%) scale(1.1);
    }

/* Tối ưu thanh cuộn scrollbar của sidebar cho tiệp màu tối */
.album-sidebar::-webkit-scrollbar {
    width: 4px;
}

.album-sidebar::-webkit-scrollbar-track {
    background: #121212;
}

.album-sidebar::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
}

/* --- RESPONSIVE TRÊN THIẾT BỊ DI ĐỘNG --- */
@media (max-width: 991px) {
    .album-main-zone {
        height: 50vh; /* Thu nhỏ chiều cao trên điện thoại để vừa mắt */
        padding: 15px;
    }

    .album-sidebar {
        height: auto;
        max-height: 40vh;
        border-left: none;
        border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

    .thumb-grid {
        grid-template-columns: repeat(4, 1fr); /* Trên mobile đổi thành 4 cột nằm ngang để cuộn xuống dễ nhìn */
    }
}