:root {
    --primary: #ee4d2d;
    --primary-light: #ff6e54;
    --text-main: #222;
    --text-muted: #757575;
    --bg-main: #f5f5f5;
    --white: #fff;
    --border: #e0e0e0;
    --gold: #ffc107;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; -webkit-tap-highlight-color: transparent; }

body { background-color: #e8e8e8; color: var(--text-main); line-height: 1.5; }

.app-container { max-width: 500px; margin: 0 auto; background: var(--white); min-height: 100vh; position: relative; box-shadow: 0 0 20px rgba(0,0,0,0.05); }

/* Typography */
h1, h2, h3, h4 { color: var(--text-main); }
.section-title { font-size: 16px; font-weight: 600; margin-bottom: 15px; padding-bottom: 10px; border-bottom: 1px solid var(--border); }

/* Slider */
.gallery-section { position: relative; width: 100%; aspect-ratio: 1/1; overflow: hidden; background: #fafafa; }
.slider-track { display: flex; transition: transform 0.3s ease-out; height: 100%; }
.slide { min-width: 100%; height: 100%; }
.slide img { width: 100%; height: 100%; object-fit: cover; }
.discount-badge { position: absolute; top: 10px; left: 10px; background: var(--primary); color: white; padding: 4px 8px; border-radius: 4px; font-weight: bold; font-size: 14px; }
.slider-dots { position: absolute; bottom: 15px; left: 50%; transform: translateX(-50%); display: flex; gap: 6px; }
.dot { width: 8px; height: 8px; background: rgba(255,255,255,0.5); border-radius: 50%; border: 1px solid #ddd; }
.dot.active { background: var(--primary); border-color: var(--primary); }

/* Product Info */
.product-info { padding: 15px; background: var(--white); margin-bottom: 8px; }
.flash-sale-banner { display: flex; justify-content: space-between; align-items: center; background: linear-gradient(90deg, #ff6e54 0%, #ee4d2d 100%); color: white; padding: 10px 15px; border-radius: 6px; margin-bottom: 15px; }
.fs-text { font-weight: 600; font-size: 14px; }
.time-box { background: #222; color: white; padding: 2px 6px; border-radius: 4px; font-family: monospace; font-size: 14px; }
.pricing-container { display: flex; align-items: baseline; gap: 10px; margin-bottom: 10px; }
.price-current { font-size: 24px; font-weight: 700; color: var(--primary); }
.price-original { font-size: 14px; text-decoration: line-through; color: var(--text-muted); }
.product-title { font-size: 15px; font-weight: 500; line-height: 1.4; margin-bottom: 10px; }
.product-stats { display: flex; justify-content: space-between; font-size: 13px; color: var(--text-muted); margin-bottom: 15px; }
.stock-progress { background: #ffeae6; border-radius: 10px; padding: 8px; text-align: center; font-size: 12px; color: var(--primary); position: relative; overflow: hidden; }
.progress-bar { background: #ffd2cb; height: 6px; border-radius: 3px; margin-top: 5px; overflow: hidden; }
.progress-fill { background: var(--primary); height: 100%; border-radius: 3px; }

/* Policies */
.policies-section { display: flex; flex-direction: column; gap: 10px; padding: 15px; background: var(--white); margin-bottom: 8px; }
.policy-item { display: flex; gap: 12px; align-items: flex-start; }
.policy-item .icon { font-size: 20px; }
.policy-desc strong { font-size: 14px; display: block; }
.policy-desc p { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* Description */
.description-section { padding: 15px; background: var(--white); margin-bottom: 8px; }
.desc-content p { font-size: 14px; margin-bottom: 10px; color: #333; }
.desc-img { width: 100%; border-radius: 6px; margin-top: 10px; }

/* Reviews */
.reviews-section { padding: 15px; background: var(--white); margin-bottom: 8px; }
.reviews-header { display: flex; justify-content: space-between; align-items: baseline; }
.view-all { font-size: 13px; color: var(--primary); }
.review-item { padding: 15px 0; border-bottom: 1px solid var(--border); }
.review-user { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.avatar { width: 32px; height: 32px; border-radius: 50%; background: #ccc; display: flex; align-items: center; justify-content: center; font-size: 14px; color: white; font-weight: bold; }
.user-info .name { font-size: 13px; font-weight: 500; }
.user-info .stars { color: var(--gold); font-size: 12px; }
.review-text { font-size: 13px; margin-bottom: 8px; }
.review-images { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 5px; }
.review-images img { width: 70px; height: 70px; object-fit: cover; border-radius: 4px; }
.btn-outline { width: 100%; padding: 10px; border: 1px solid var(--primary); color: var(--primary); background: transparent; border-radius: 4px; font-weight: 600; margin-top: 10px; cursor: pointer; }

/* FAQ Accordion */
.faq-section { padding: 15px; background: var(--white); margin-bottom: 8px; }
.accordion-item { border-bottom: 1px solid var(--border); }
.accordion-header { width: 100%; display: flex; justify-content: space-between; padding: 15px 0; background: none; border: none; font-size: 14px; font-weight: 500; text-align: left; cursor: pointer; }
.accordion-content { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.accordion-content p { padding-bottom: 15px; font-size: 13px; color: var(--text-muted); }
.accordion-item.active .accordion-content { max-height: 200px; }

/* Bottom CTA (Chuẩn UI TikTok Shop) */
.bottom-spacer { height: 70px; }

.sticky-bottom-cta { 
    position: fixed; 
    bottom: 0; 
    left: 50%; 
    transform: translateX(-50%); 
    width: 100%; 
    max-width: 500px; 
    height: 60px; /* Điều chỉnh chiều cao cho cân đối */
    background: var(--white); 
    border-top: 1px solid var(--border); /* Viền mỏng thay vì bóng đổ dày */
    display: flex; 
    align-items: center; 
    padding: 0 10px 0 5px; /* Thêm khoảng cách 2 bên mép */
    z-index: 100; 
}

.icon-btn { 
    flex: 0 0 55px; /* Cố định chiều rộng cho các icon */
    border: none; 
    background: transparent; 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: center; 
    font-size: 10px; 
    color: var(--text-muted); 
    position: relative; 
    cursor: pointer; 
}

.icon-btn .icon { font-size: 20px; margin-bottom: 2px; }

.cart-btn .badge { 
    position: absolute; 
    top: 2px; 
    right: 12px; 
    background: #fe2c55; /* Màu viền đỏ TikTok */
    color: white; 
    font-size: 10px; 
    padding: 2px 5px; 
    border-radius: 10px; 
    line-height: 1; 
}

/* Nút Mua Ngay TikTok Shop */
.buy-now-btn { 
    flex: 1; /* Tự động phóng to chiếm hết khoảng trống còn lại */
    background: #fe2c55; /* Màu đỏ/hồng chuẩn của TikTok */
    color: white; 
    border: none; 
    height: 42px; /* Chiều cao vừa vặn */
    border-radius: 30px; /* Bo góc tròn hẳn (Pill shape) */
    font-size: 15px; 
    font-weight: 600; 
    cursor: pointer; 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: center; 
    margin-left: 10px; /* Tách biệt với cụm icon */
    line-height: 1.2;
}

.buy-now-btn small { 
    font-size: 11px; 
    font-weight: 400; 
    opacity: 0.9; 
}

/* Sửa lại hiệu ứng rung: Giữ nguyên màu, chỉ phóng to nhẹ */
.pulse-animation { animation: pulse 1.5s infinite; }
@keyframes pulse { 
    0% { transform: scale(1); } 
    50% { transform: scale(1.03); } 
    100% { transform: scale(1); } 
}

/* Modals & Overlays */
.overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 999; display: none; opacity: 0; transition: opacity 0.3s; }
.overlay.active { display: block; opacity: 1; }

.sidebar { position: fixed; top: 0; right: -100%; width: 85%; max-width: 400px; height: 100%; background: var(--white); z-index: 1000; transition: right 0.3s ease; display: flex; flex-direction: column; }
.sidebar.active { right: 0; }

.modal { position: fixed; bottom: -100%; left: 50%; transform: translateX(-50%); width: 100%; max-width: 500px; background: var(--white); z-index: 1000; transition: bottom 0.3s ease; border-radius: 12px 12px 0 0; display: flex; flex-direction: column; max-height: 90vh; }
.modal.active { bottom: 0; }

.sidebar-header, .modal-header { display: flex; justify-content: space-between; align-items: center; padding: 15px; border-bottom: 1px solid var(--border); }
.close-btn { background: none; border: none; font-size: 24px; color: var(--text-muted); cursor: pointer; }

/* Cart styles */
.cart-body { flex: 1; overflow-y: auto; padding: 15px; }
.cart-footer { padding: 15px; border-top: 1px solid var(--border); background: var(--white); }
.cart-total { display: flex; justify-content: space-between; font-weight: 600; margin-bottom: 15px; font-size: 16px; color: var(--primary); }

/* Checkout styles */
.modal-body { padding: 15px; overflow-y: auto; }
.checkout-product-summary { display: flex; gap: 15px; margin-bottom: 20px; padding-bottom: 15px; border-bottom: 1px dashed var(--border); }
.checkout-thumb { width: 80px; height: 80px; object-fit: cover; border-radius: 6px; }
.checkout-product-info h4 { font-size: 14px; margin-bottom: 5px; }
.checkout-product-info .price { color: var(--primary); font-weight: 600; margin-bottom: 10px; }
.qty-control { display: flex; align-items: center; border: 1px solid var(--border); width: fit-content; border-radius: 4px; }
.qty-control button { width: 30px; height: 30px; background: #f9f9f9; border: none; font-size: 16px; cursor: pointer; }
.qty-control input { width: 40px; height: 30px; border: none; border-left: 1px solid var(--border); border-right: 1px solid var(--border); text-align: center; font-size: 14px; }

.form-group { margin-bottom: 12px; }
.form-row { display: flex; gap: 10px; margin-bottom: 12px; }
.form-row select { flex: 1; }
input, select, textarea { width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; background: #fafafa; }
input:focus, select:focus, textarea:focus { border-color: var(--primary); outline: none; background: var(--white); }

.btn-primary { background: var(--primary); color: white; padding: 14px; border: none; border-radius: 6px; font-size: 16px; font-weight: 600; cursor: pointer; text-transform: uppercase; }
.full-width { width: 100%; }

/* Toast */
#toast-container { position: fixed; bottom: 80px; left: 10px; z-index: 998; display: flex; flex-direction: column; gap: 10px; pointer-events: none; }
.toast { background: rgba(0,0,0,0.8); color: white; padding: 10px 15px; border-radius: 20px; font-size: 12px; display: flex; align-items: center; gap: 8px; animation: slideInLeft 0.5s, fadeOut 0.5s 3.5s forwards; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
.toast img { width: 24px; height: 24px; border-radius: 50%; }
@keyframes slideInLeft { from { transform: translateX(-100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes fadeOut { to { opacity: 0; transform: translateY(10px); } }

.success-icon { font-size: 50px; }
/* Custom Banner/Screenshot */
.app-screenshot-banner {
    width: 100%;
    margin-top: 10px;
    margin-bottom: 15px;
}

.app-screenshot-banner img {
    width: 100%;            /* Bắt buộc ảnh phải chiếm 100% chiều rộng khung chứa */
    height: auto;           /* Chiều cao tự động tỷ lệ thuận để không bị méo ảnh */
    display: block;         /* Xóa khoảng trắng thừa bên dưới ảnh của HTML mặc định */
    border-radius: 8px;     /* Bo góc 8px cho đồng bộ với thiết kế UI hiện đại */
    box-shadow: 0 2px 8px rgba(0,0,0,0.05); /* Thêm bóng đổ nhẹ cho ảnh nổi bật hơn */
    border: 1px solid var(--border); /* Viền mỏng phân cách */
}
/* =========================================
   TOP APP HEADER (THANH NAV TRÊN CÙNG)
   ========================================= */
.app-header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.98);
    display: flex;
    align-items: center;
    padding: 10px 12px;
    gap: 12px;
    z-index: 999;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.header-btn {
    background: none;
    border: none;
    font-size: 20px;
    color: #444;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}
.header-search {
    flex: 1;
    background: #f1f1f1;
    border-radius: 4px;
    display: flex;
    align-items: center;
    padding: 6px 10px;
    height: 34px;
}
.header-search .search-icon { font-size: 14px; margin-right: 6px; color: #777; }
.header-search input {
    border: none;
    background: transparent;
    font-size: 14px;
    width: 100%;
    outline: none;
    color: #333;
}
.header-actions { display: flex; gap: 12px; align-items: center; }
.cart-btn-top { position: relative; }
.cart-badge-top {
    position: absolute;
    top: -6px; right: -8px;
    background: #fe2c55;
    color: white;
    font-size: 10px;
    padding: 1px 5px;
    border-radius: 10px;
    font-weight: bold;
    border: 1px solid white;
}
.cart-time-top {
    position: absolute;
    bottom: -16px; left: 50%;
    transform: translateX(-50%);
    background: #fe2c55;
    color: white;
    font-size: 8px;
    padding: 2px 5px;
    border-radius: 8px;
    white-space: nowrap;
    font-weight: 600;
}

/* =========================================
   XTRA FREESHIP BANNER (DƯỚI ẢNH SẢN PHẨM)
   ========================================= */
.xtra-banners {
    position: absolute;
    bottom: 0;
    left: 0;
    display: flex;
    height: 42px;
    z-index: 10;
}
.xtra-item {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 4px 15px 4px 10px;
    color: white;
    line-height: 1.1;
}
.xtra-item strong { font-size: 14px; font-weight: 900; font-style: italic; letter-spacing: 0.5px; }
.xtra-item span { font-size: 11px; font-weight: 500; }

/* Kỹ thuật Clip-path tạo khối vát chéo */
.xtra-1 {
    background: #00d1d1; 
    clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
    padding-right: 22px;
    padding-left: 8px;
}
.xtra-2 {
    background: #00b14f; 
    clip-path: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
    margin-left: -18px; /* Kéo lùi lại để xếp chồng lên khối 1 */
    padding-left: 22px;
    padding-right: 22px;
}
.xtra-3 {
    background: #ffc107; 
    color: #333;
    clip-path: polygon(12px 0, 100% 0, 100% 100%, 0 100%);
    margin-left: -18px; /* Kéo lùi lại để xếp chồng lên khối 2 */
    padding-left: 22px;
    padding-right: 12px;
}

.image-counter {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.45);
    color: white;
    font-size: 12px;
    font-weight: 500;
    padding: 3px 10px;
    border-radius: 12px;
    z-index: 10;
    border: 1px solid rgba(255,255,255,0.2);
}