:root {
    /* Microsoft 2026 Color Palette */
    --primary: #ffa000; /* Màu nhấn chính theo yêu cầu */
    --primary-hover: #ffb333;
    --background: #e2e2e2;
    --card-bg: rgba(255, 255, 255, 0.7); /* Glassmorphism */
    --acrylic-bg: rgba(255, 255, 255, 0.85);
    --text-main: #1b1b1b;
    --text-secondary: #5d5d5d;
    --border-color: rgba(0, 0, 0, 0.08);
    --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.02);
    --shadow-depth: 0 16px 32px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.05);
    
    /* Fluent Settings */
    --radius-full: 100px;
    --radius-lg: 12px;
    --radius-md: 8px;
    --radius-sm: 4px;
    --transition-base: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Base & Reset */
* { box-sizing: border-box; margin: 0; padding: 0; outline: none; }
body { 
    background-color: var(--background); 
    color: var(--text-main); 
    font-family: 'Segoe UI', 'Segoe UI Web (West European)', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Nền mờ ảo (Hơi hướng Microsoft Cosmos) */
.fluent-background {
    position: fixed; top: -50%; left: -50%; width: 200%; height: 200%;
    background: 
        radial-gradient(circle at 10% 20%, rgba(255, 160, 0, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 80% 80%, rgba(0, 120, 212, 0.02) 0%, transparent 40%);
    z-index: -1;
}

/* Header - Acrylic effect */
header { 
    background: var(--acrylic-bg);
    backdrop-filter: blur(20px) saturate(180%);
    height: 70px; 
    display: flex; align-items: center; justify-content: space-between; 
    padding: 0 24px; 
    border-bottom: 1px solid var(--border-color);
    position: sticky; top: 0; z-index: 100; 
}
header .logo { 
    font-size: 26px; font-weight: 700; color: #000; cursor: pointer; 
    letter-spacing: -1px;
    transition: var(--transition-base);
}
header .logo:hover { transform: scale(1.02); }
header .logo-highlight { color: var(--primary); }

#menu-btn { 
    background: none; border: none; font-size: 20px; cursor: pointer; padding: 10px;
    border-radius: var(--radius-md); transition: var(--transition-base);
    color: var(--text-main);
}
#menu-btn:hover { background-color: rgba(0, 0, 0, 0.04); }

.header-actions { display: flex; align-items: center; gap: 10px; }
.cart-icon { 
    font-size: 22px; cursor: pointer; position: relative; padding: 12px;
    border-radius: var(--radius-md); transition: var(--transition-base);
}
.cart-icon:hover { background-color: rgba(0, 0, 0, 0.04); color: var(--primary); }
#cart-count { 
    position: absolute; top: 5px; right: 5px; 
    background: #000; color: white; 
    font-size: 11px; font-weight: bold; 
    width: 18px; height: 18px; display: flex; align-items: center; justify-content: center;
    border-radius: 50%; 
}

/* Layout Main */
.main-container { display: flex; flex: 1; position: relative; }

/* Sidebar - Microsoft Fluent Navigation */
#sidebar { 
    position: fixed; top: 0; left: -280px; width: 280px; height: 100vh; 
    background: var(--acrylic-bg); backdrop-filter: blur(20px);
    border-right: 1px solid var(--border-color);
    transition: var(--transition-base); z-index: 1000; padding: 15px; 
    display: flex; flex-direction: column;
}
#sidebar.open { left: 0; box-shadow: var(--shadow-depth); }
.sidebar-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px; margin-bottom: 20px;
}
#close-sidebar { 
    background: none; border: none; font-size: 16px; cursor: pointer; padding: 8px;
    border-radius: var(--radius-sm);
}
#close-sidebar:hover { background: rgba(0,0,0,0.05); }

#category-list { list-style: none; }
#category-list li { 
    padding: 12px 15px; border-radius: var(--radius-md);
    cursor: pointer; transition: var(--transition-base); 
    color: var(--text-main); font-size: 14px; font-weight: 400;
    margin-bottom: 2px;
    display: flex; align-items: center;
}
#category-list li:hover { background-color: rgba(0, 0, 0, 0.03); }
#category-list li.active { 
    background-color: rgba(255, 160, 0, 0.08); 
    color: var(--primary); font-weight: 600; 
    position: relative;
}
#category-list li.active::before {
    content: ''; position: absolute; left: 0; top: 12px; bottom: 12px; width: 3px;
    background-color: var(--primary); border-radius: var(--radius-full);
}

#sidebar-overlay { 
    display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; 
    background: rgba(0,0,0,0.2); z-index: 999; opacity: 0; transition: var(--transition-base);
}
#sidebar-overlay.open { display: block; opacity: 1; }

/* Main App Area */
#app { flex: 1; padding: 30px 24px; max-width: 1300px; margin: 0 auto; width: 100%; animation: fadeInPage 0.5s ease; }
@keyframes fadeInPage { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* Tiêu đề trang */
h2 { font-weight: 600; font-size: 24px; letter-spacing: -0.5px; margin-bottom: 25px; color: #000; }

/* Product Grid */
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px; }

/* Product Card - Premium & Soft */
.product-card { 
    background: var(--card-bg); 
    border-radius: var(--radius-lg); overflow: hidden; 
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-card);
    transition: var(--transition-bounce); cursor: pointer; 
    display: flex; flex-direction: column; position: relative;
}
.product-card:hover { 
    transform: translateY(-8px) scale(1.01); 
    box-shadow: var(--shadow-depth);
    border-color: rgba(255, 160, 0, 0.2);
}

.product-card .img-container { width: 100%; height: 240px; overflow: hidden; background: #fff; position: relative; padding: 7px;}
.product-card img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition-bounce); border-radius: 10px;}
.product-card:hover .img-container img { transform: scale(1.05);border-radius: 10px 10px 0 0; }

.product-info { padding: 20px; flex: 1; display: flex; flex-direction: column; background: #fff; text-align: center;}
.product-name { font-weight: 600; font-size: 16px; color: #000; margin-bottom: 6px; line-height: 1.4; flex: 1;}
.product-price { color: var(--primary); font-size: 19px; font-weight: 700; margin-bottom: 15px; letter-spacing: -0.5px; }
.stock-status { font-size: 12px; color: var(--text-secondary); margin-bottom: 15px; }

/* Buttons - Fluent Style */
.btn-add { 
    background: #ffa000; color: white; border: none; 
    padding: 12px; border-radius: var(--radius-md); 
    cursor: pointer; font-weight: 600; font-size: 14px;
    transition: var(--transition-base); 
    width: 100%; display: flex; align-items: center; justify-content: center; gap: 8px;
}
.btn-add:hover { background: #d38400; transform: translateY(-1px); }
.btn-add:active { transform: translateY(1px); }
.btn-add:disabled { background: #e1e1e1; color: #999; cursor: not-allowed; transform: none; }

/* Hết hàng badge */
.oos-badge {
    position: absolute; top: 15px; right: 15px;
    background: rgba(0,0,0,0.6); color: #fff; font-size: 11px; font-weight: bold;
    padding: 5px 10px; border-radius: var(--radius-full); backdrop-filter: blur(5px);
}

/* Product Details Page - Premium Layout */
.product-detail-container { 
    display: grid; gap: 50px;
    background: #fff; padding: 40px; 
    border-radius: var(--radius-lg); box-shadow: var(--shadow-card); 
    border: 1px solid var(--border-color);
    grid-template-columns: 1fr 2fr;
}
.detail-images { flex: 1.2; display: flex; flex-direction: column; gap: 15px; }
.main-img-container { border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--border-color); background: #fff; aspect-ratio: 1; display: flex; align-items: center;}
.main-img-container img { width: 100%; object-fit: cover; }

.thumb-images { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.thumb-images img { 
    width: 100%; height: 80px; object-fit: cover; 
    border-radius: var(--radius-md); border: 2px solid transparent; cursor: pointer; transition: var(--transition-base);
}
.thumb-images img:hover { border-color: #ddd; }
.thumb-images img.active { border-color: var(--primary); }

.detail-info { flex: 1; padding-top: 10px;}
.detail-info h1 { font-size: 32px; font-weight: 700; letter-spacing: -1px; margin-bottom: 10px; color: #000; }
.detail-info .price { font-size: 28px; color: var(--primary); font-weight: 700; margin-bottom: 20px; }
.detail-meta { font-size: 14px; color: var(--text-secondary); padding: 15px 0; border-top: 1px solid var(--border-color); }

.detail-description { margin: 25px 0; line-height: 1.8; color: var(--text-main); font-size: 15px; }
.detail-description b { color: #000; }

.action-pane { 
    background: var(--background); padding: 20px; border-radius: var(--radius-lg);
    margin-top: 30px; border: 1px solid var(--border-color);
}
.qty-control { display: flex; align-items: center; gap: 5px; margin-bottom: 0px; background: #fff; width: fit-content; border-radius: var(--radius-md); border: 1px solid #ddd; overflow: hidden;}
.qty-control button { 
    width: 40px; height: 40px; border: none; background: #fff; 
    cursor: pointer; font-size: 18px; color: var(--text-main); transition: var(--transition-base);
}
.qty-control button:hover { background-color: #f5f5f5; }
.qty-control input { 
    width: 50px; height: 40px; text-align: center; border: none; 
    font-size: 16px; font-weight: 600; color: #000; background: #fff;
}

/* Cart Page */
.cart-container { 
    background: #fff; padding: 40px; 
    border-radius: var(--radius-lg); box-shadow: var(--shadow-card); 
    border: 1px solid var(--border-color);
}
.cart-header-grid { display: grid; grid-template-columns: 100px 1fr 120px 120px 50px; gap: 15px; padding-bottom: 15px; border-bottom: 1px solid var(--border-color); color: var(--text-secondary); font-size: 13px; font-weight: 600; }

.cart-item { 
    display: grid; grid-template-columns: 100px 1fr 120px 120px 50px; gap: 15px; 
    align-items: center; padding: 20px 0; border-bottom: 1px solid var(--border-color); 
}
.cart-item img { width: 80px; height: 80px; object-fit: cover; border-radius: var(--radius-md); background: #fff; border: 1px solid #eee; }
.cart-item-name { font-weight: 600; color: #000; font-size: 15px; }
.cart-item-id { font-size: 12px; color: var(--text-secondary); margin-top: 3px;}
.cart-item-price { font-weight: 600; color: var(--primary); }

.btn-remove { 
    background: none; border: none; color: #999; font-size: 18px; cursor: pointer; padding: 10px;
    border-radius: 50%; transition: var(--transition-base);
}
.btn-remove:hover { background-color: rgba(255,0,0,0.05); color: #ff4d4f; }

.cart-footer { display: flex; justify-content: space-between; align-items: flex-start; margin-top: 30px; gap: 30px; }

.checkout-form { 
    flex: 1; display: flex; flex-direction: column; gap: 12px; 
    background: var(--background); padding: 25px; border-radius: var(--radius-lg); 
    border: 1px solid var(--border-color);
}
.checkout-form h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; }
.fluent-input, .fluent-textarea { 
    width: 100%; padding: 12px 15px; 
    border: 1px solid #ccc; border-radius: var(--radius-md); 
    background: #fff; font-size: 14px; transition: var(--transition-base);
}
.fluent-input:focus, .fluent-textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(255, 160, 0, 0.1); }

.cart-summary-card { 
    width: 350px; background: #fff; padding: 25px; 
    border-radius: var(--radius-lg); border: 1px solid var(--border-color); box-shadow: var(--shadow-card);
}
.summary-row { display: flex; justify-content: space-between; margin-bottom: 15px; font-size: 14px; }
.summary-total { font-size: 20px; font-weight: 700; color: #000; border-top: 1px solid var(--border-color); padding-top: 15px; display:none;}
.note-shipping { font-size: 12px; color: var(--text-secondary); font-weight: 400; margin-top: 5px; }

/* Zalo Float & Modal - Fluent style */
#zalo-float { 
    position: fixed; bottom: 9px; right: -10px; cursor: pointer; z-index: 900; 
    transition: 0.2s; 
    box-shadow: 0 17px 12px rgb(0 0 0 / 79%);
}
#zalo-float:hover {  right: -2px;}

#zalo-modal { 
    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; 
    background: rgba(0,0,0,0.4); backdrop-filter: blur(10px);
    z-index: 2000; align-items: center; justify-content: center; opacity: 0; transition: var(--transition-base);
}
#zalo-modal.active { display: flex; opacity: 1; }
.zalo-content { 
    background: var(--acrylic-bg); padding: 40px; border-radius: 20px; text-align: center; position: relative;
    box-shadow: var(--shadow-depth); border: 1px solid rgba(255,255,255,0.3);
    transform: scale(0.9); transition: var(--transition-bounce);
}
#zalo-modal.active .zalo-content { transform: scale(1); }

.qr-container { background: #fff; padding: 15px; border-radius: var(--radius-lg); display: inline-block; margin: 20px 0; border: 1px solid #eee; }
.zalo-phone { font-size: 22px; font-weight: 700; color: var(--primary); margin-bottom: 5px; }
.zalo-desc { font-size: 13px; color: var(--text-secondary); }

/* Toast - Microsoft Notification Style */
#toast { 
    visibility: hidden; min-width: 280px; 
    background: rgba(50, 50, 50, 0.95); backdrop-filter: blur(10px);
    color: #fff; border-radius: var(--radius-lg); padding: 16px 20px; 
    position: fixed; z-index: 3000; bottom: 30px; left: 30px; 
    box-shadow: var(--shadow-depth);
    display: flex; align-items: center; gap: 12px; font-size: 14px;
    transform: translateY(20px); opacity: 0; transition: var(--transition-bounce);
}
#toast.show { visibility: visible; opacity: 1; transform: translateY(0); }
#toast i { color: var(--primary); font-size: 18px; }

/* Footer */
footer { 
    text-align: center; padding: 30px; background: #fff; 
    font-size: 13px; color: var(--text-secondary); margin-top: auto; 
    border-top: 1px solid var(--border-color); 
}

.btn-add .text-short {
    display: none;
}
.btn-add .text-full {
    display: inline;
}

/* Modal Google Map Style */
#map-modal { 
    display: none; 
    position: fixed; 
    top: 0; left: 0; 
    width: 100%; height: 100%; 
    background: rgba(0,0,0,0.6); 
    backdrop-filter: blur(10px);
    z-index: 2000; 
    align-items: center; 
    justify-content: center; 
    opacity: 0; 
    transition: var(--transition-base);
}

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

.map-content { 
    background: var(--acrylic-bg); 
    padding: 24px; 
    border-radius: 16px; 
    text-align: center; 
    position: relative;
    box-shadow: var(--shadow-depth); 
    border: 1px solid rgba(255,255,255,0.3);
    width: 90%; 
    max-width: 1000px;
    transform: scale(0.9); 
    transition: var(--transition-bounce);
}

#map-modal.active .map-content { 
    transform: scale(1); 
}

.map-content h3 {
    margin-bottom: 15px;
    font-size: 18px;
    color: var(--text-main);
}

.close-map-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    background: #e1e1e1;
    border: none;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 13px;
    transition: var(--transition-base);
}

.close-map-btn:hover {
    background: #d0d0d0;
}

.map-iframe-wrapper {
    width: 100%;
    height: 600px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

/* CSS cho Modal Ước tính phí ship */
#ship-calc-modal {
    display: none;
    position: fixed;
    top: 0; 
    left: 0;
    width: 100%; 
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-base);
}

/* Hiển thị modal khi có class active */
#ship-calc-modal.active {
    display: flex;
    opacity: 1;
}

/* Hiệu ứng nảy (bounce) cho nội dung bên trong modal */
#ship-calc-modal .map-content {
    transform: scale(0.9);
    transition: var(--transition-bounce);
}

#ship-calc-modal.active .map-content {
    transform: scale(1);
}

@media (max-width: 576px) {
    .map-content {
        padding: 15px;
        width: 95%;
    }
    .map-iframe-wrapper {
        height: 350px;
    }
}

/* Mobile Responsiveness */
@media (max-width: 992px) {
    .product-detail-container { flex-direction: column; padding: 25px; gap: 30px; }
    .cart-header-grid { display: none; }
    .cart-item { grid-template-columns: 80px 1fr 50px; grid-template-rows: auto auto; gap: 10px; }
    .cart-item img { grid-row: span 2; width: 70px; height: 70px; }
    .cart-item-actions { grid-column: span 2; display: flex; justify-content: space-between; align-items: center; margin-top: 10px;}
    .cart-item-price { justify-self: end; }
    .cart-footer { flex-direction: column-reverse; }
    .cart-summary-card { width: 100%; }
}

@media (max-width: 576px) {
    header { padding: 0 15px; }
    .logo { font-size: 22px; }
    #app { padding: 20px 15px; }
    .product-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 15px; }
    .product-card height: 180px;
    .product-info { padding: 15px; }
    .product-name { font-size: 14px; }
    .product-price { font-size: 16px; }
    .btn-add { padding: 10px; font-size: 13px; }
    .detail-info h1 { font-size: 24px; }
    .cart-container { padding: 20px; }
}

@media (max-width: 768px) {
    .product-detail-container {
    	display: flex; gap: 50px; 
    }
}

@media (max-width: 410px) {
    .product-info {    padding: 10px;    flex-direction: column;}
	.product-card .img-container {    width: 130px;    height: 130px;}
	.product-card {    flex-direction: row;}
	.product-card:hover .img-container img { border-radius: 10px;}
	.product-card img {    border: 1px solid #ddd;}
	.product-grid {    display: flex;    flex-direction: column;}
	.btn-add .text-full {        display: none;    }
    .btn-add .text-short {        display: inline;    }
    .product-price {    margin-bottom: 5px;}
    .stock-status {    margin-bottom: 5px;}
}