:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --accent-color: #00d2ff;
    --dark-bg: #0f172a;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --zalo-color: #0068ff;
    --tele-color: #0088cc;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

.glass-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 30%, #1e293b 0%, #0f172a 100%);
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px 100px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo i {
    font-size: 2.5rem;
    color: var(--accent-color);
    filter: drop-shadow(0 0 10px rgba(0, 210, 255, 0.5));
}

.logo h1 {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: 2px;
    background: linear-gradient(to right, #fff, var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
    margin-bottom: 20px;
}

.header-actions {
    margin-top: 10px;
    display: flex;
    justify-content: center;
}

.btn-buy-key {
    background: linear-gradient(135deg, var(--accent-color), #0088cc);
    color: var(--dark-bg);
    border: none;
    padding: 12px 25px;
    border-radius: 50px;
    font-family: inherit;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 15px rgba(0, 210, 255, 0.3);
}

.btn-buy-key:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(0, 210, 255, 0.5);
    filter: brightness(1.1);
}

.btn-buy-key i {
    font-size: 1.1rem;
}

.search-bar {
    position: relative;
    max-width: 600px;
    margin: 0 auto 30px;
}

.search-bar i {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-bar input {
    width: 100%;
    padding: 15px 15px 15px 55px;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    color: #fff;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.search-bar input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.2);
    background: rgba(255, 255, 255, 0.1);
}

.categories {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 30px;
}

.tab {
    padding: 10px 20px;
    border-radius: 30px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.tab.active {
    background: var(--accent-color);
    color: #0f172a;
    border-color: var(--accent-color);
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(0, 210, 255, 0.3);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.product-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 100%);
    pointer-events: none;
}

.product-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.product-card.selected {
    border-color: var(--accent-color);
    background: rgba(0, 210, 255, 0.05);
}

.product-image-container {
    width: 100%;
    height: 180px;
    background: rgba(255, 255, 255, 0.02);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    border-bottom: 1px solid var(--glass-border);
}

.product-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 10px;
    transition: transform 0.3s ease;
}

.product-card:hover .product-image {
    transform: scale(1.05);
}

.image-placeholder {
    font-size: 3rem;
    color: var(--glass-border);
}

.product-info {
    padding: 20px;
}

.product-label {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--accent-color);
    color: var(--dark-bg);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 50px;
    z-index: 10;
}

.product-selection-check {
    position: absolute;
    top: 15px;
    left: 15px;
    font-size: 1.5rem;
    color: var(--accent-color);
    z-index: 10;
    opacity: 0;
    transform: scale(0.5);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    filter: drop-shadow(0 0 5px rgba(0, 210, 255, 0.5));
}

.product-card.selected .product-selection-check {
    opacity: 1;
    transform: scale(1);
}

.product-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
    color: #fff;
    flex-grow: 1;
}

.product-footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--glass-border);
}

.retail-price {
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
}

.warranty {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.warranty i {
    margin-right: 5px;
}

.selection-bar {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 600px;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    padding: 15px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    transition: bottom 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.selection-bar.active {
    bottom: 30px;
}

.selection-info {
    font-weight: 600;
    color: #fff;
}

.contact-actions {
    display: flex;
    gap: 10px;
}

.btn-contact {
    padding: 10px 20px;
    border-radius: 30px;
    border: none;
    color: #fff;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.btn-contact.zalo {
    background: var(--zalo-color);
}

.btn-contact.tele {
    background: var(--tele-color);
}

.btn-contact:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}

footer {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Branch Section */
.branch-section {
    max-width: 800px;
    margin: 0 auto 40px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 10px;
    overflow: hidden;
}

.branch-toggle {
    text-align: center;
    padding: 15px;
    cursor: pointer;
    color: var(--accent-color);
    font-size: 1.2rem;
    font-weight: 600;
    user-select: none;
    transition: all 0.3s ease;
}

.branch-toggle:hover {
    background: rgba(255, 255, 255, 0.05);
}

.branch-grid {
    display: none;
    /* Collapsed by default */
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 15px;
    padding: 15px;
    border-top: 1px solid var(--glass-border);
}

.branch-card {
    background: rgba(255, 255, 255, 0.03);
    padding: 20px;
    border-radius: 15px;
    border-left: 4px solid var(--accent-color);
}

.branch-card h5 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: #fff;
}

.branch-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.branch-card a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
}

/* Lightbox & Modal Base */
.lightbox-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(15px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lightbox-modal.active {
    display: flex;
    opacity: 1;
}

.lightbox-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 20px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.lightbox-close {
    position: absolute;
    top: -50px;
    right: 0;
    color: #fff;
    font-size: 35px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.lightbox-close:hover {
    color: var(--accent-color);
    transform: scale(1.2);
}

.lightbox-image {
    max-width: 100%;
    max-height: 70vh;
    border-radius: 12px;
    object-fit: contain;
}

.lightbox-caption {
    color: #fff;
    margin-top: 15px;
    font-size: 1.2rem;
    font-weight: 600;
    text-align: center;
}

/* Footer Contacts */
.footer-contacts {
    margin-top: 60px;
    text-align: center;
    padding: 40px 20px;
    background: var(--glass-bg);
    border-radius: 30px;
    border: 1px solid var(--glass-border);
}

.footer-contacts h3 {
    font-size: 1.5rem;
    margin-bottom: 25px;
}

.quick-contact-btns {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.footer-note {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Existing Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.product-card {
    animation: fadeIn 0.5s ease backwards;
}

/* Responsive */
@media (max-width: 768px) {
    .logo h1 {
        font-size: 2.2rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .selection-bar {
        width: 95%;
        padding: 10px 20px;
    }

    .btn-contact span {
        display: none;
    }

    .product-grid {
        grid-template-columns: 1fr;
    }

    .branch-grid {
        grid-template-columns: 1fr;
    }
}

.loader {
    width: 48px;
    height: 48px;
    border: 5px solid #fff;
    border-bottom-color: var(--accent-color);
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    margin: 40px auto;
}

.btn-buy-key {
    background: var(--accent-color);
    color: #fff;
    padding: 10px 20px;
    border-radius: 30px;
    border: none;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.btn-buy-key:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}

/* Key Modal Specifics */
.key-modal-content {
    width: 95%;
    max-width: 900px;
    height: 90vh;
    padding: 0;
    overflow: hidden;
    background: #000;
    border: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
}

.modal-nav {
    width: 100%;
    padding: 15px 20px;
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
}

.btn-back {
    background: var(--glass-bg);
    color: var(--accent-color);
    border: 1px solid var(--glass-border);
    padding: 8px 15px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.btn-back:hover {
    background: var(--accent-color);
    color: var(--dark-bg);
    transform: translateX(-5px);
}

.key-iframe {
    width: 100%;
    flex: 1;
    border: none;
}

@keyframes rotation {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}