*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
    --black:#111111;
    --black-soft:#1A1A1A;
    --white:#FFFFFF;
    --off-white:#FAFAFA;
    --gray-900:#262626;
    --gray-700:#525252;
    --gray-500:#8A8A8A;
    --gray-300:#D4D4D4;
    --gray-200:#E5E5E5;
    --gray-100:#F0F0F0;
    --border:#E2E2E2;
    --border-strong:#111111;
    --success:#16A34A;
    --success-bg:#F0FDF4;
    --success-border:#BBF7D0;
    --danger:#DC2626;
    --danger-bg:#FEF2F2;
    --danger-border:#FECACA;
    --warning:#B45309;
    --warning-bg:#FFFBEB;
    --warning-border:#FDE68A;
    --info:#1D4ED8;
    --info-bg:#EFF6FF;
    --info-border:#BFDBFE;
    --radius-sm:4px;
    --radius-md:6px;
    --radius-lg:8px;
    --radius-xl:10px;
    --radius-full:9999px;
    --shadow-xs:0 1px 2px rgba(0,0,0,0.03);
    --shadow-sm:0 1px 2px rgba(0,0,0,0.04);
    --shadow-card:0 0 0 1px var(--border);
    --font:-apple-system,BlinkMacSystemFont,'Helvetica Neue','Inter','Segoe UI',Arial,sans-serif;
    --fast:0.12s ease;
    --base:0.15s ease
}

html{
    font-size:16px;
    -webkit-font-smoothing:antialiased;
    -moz-osx-font-smoothing:grayscale;
    text-rendering:optimizeLegibility;
    scroll-behavior:smooth
}

body{
    font-family:var(--font);
    background:var(--off-white);
    color:var(--black);
    line-height:1.6;
    min-height:100vh;
    display:flex;
    flex-direction:column
}

::selection{background:var(--black);color:var(--white)}

::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--gray-300);border-radius:99px}

a{color:var(--black);text-decoration:underline;text-underline-offset:2px}

img{max-width:100%;width:100%;height:auto;display:block;object-fit:contain}

input,select,textarea,button{font-family:inherit;font-size:inherit;line-height:inherit;outline:none}

table{
    width:100%;
    border-collapse:separate;
    border-spacing:0;
    background:var(--white);
    border-radius:var(--radius-md);
    overflow:hidden;
    box-shadow:var(--shadow-card)
}
thead{background:var(--off-white)}
th{padding:14px 20px;text-align:left;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:0.07em;color:var(--gray-500);border-bottom:1px solid var(--border)}
td{padding:14px 20px;font-size:14px;color:var(--gray-700);border-bottom:1px solid var(--border)}
tbody tr:last-child td{border-bottom:none}

hr{border:none;height:1px;background:var(--border);margin:32px 0}

blockquote{
    margin:24px 0;padding:18px 24px;
    background:var(--off-white);border-left:3px solid var(--black);
    border-radius:0;
    color:var(--gray-700);font-size:15px;font-style:italic
}

.container{max-width:1320px;margin:0 auto;padding:0 32px;width:100%}

/* ---------- Header ---------- */
.site-header{
    background:var(--white);
    border-bottom:1px solid var(--border);
    padding:18px 0;
    position:sticky;
    top:0;
    z-index:1000
}

.site-logo{
    font-size:20px;font-weight:700;color:var(--black);
    text-decoration:none;display:inline-block;letter-spacing:-0.02em;
    text-transform:uppercase
}

.site-tagline{color:var(--gray-500);font-size:12px;margin-top:3px;font-weight:500;letter-spacing:0.03em;text-transform:uppercase}

.site-main{padding:44px 0 72px;flex:1}

.site-footer{
    background:var(--black);color:var(--gray-300);
    border-top:1px solid var(--border);
    padding:36px 0;text-align:center;font-size:13px
}
.site-footer a{color:var(--white);font-weight:500;text-decoration:none;border-bottom:1px solid var(--gray-700)}

/* ---------- Category filter ---------- */
.category-filter{
    display:flex;gap:8px;flex-wrap:wrap;
    margin-bottom:36px;justify-content:center;padding:4px
}

.category-chip{
    padding:9px 20px;border-radius:var(--radius-full);
    font-size:13px;font-weight:600;color:var(--black);
    border:1px solid var(--black);text-decoration:none;
    background:var(--white);
    display:inline-flex;align-items:center;user-select:none
}
.category-chip.active{
    background:var(--black);color:var(--white);border-color:var(--black)
}

/* ---------- Product grid ---------- */
.product-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(160px,190px));
    justify-content:start;
    gap:14px;
    align-items:start
}

.product-card{
    background:var(--white);
    border-radius:var(--radius-md);
    overflow:hidden;
    box-shadow:none;
    border:1px solid var(--border);
    display:flex;flex-direction:column;
    position:relative
}

.product-card-image{
    width:100%;height:auto;aspect-ratio:1/1;
    background:var(--off-white);
    display:flex;align-items:center;justify-content:center;
    overflow:hidden;padding:14px;position:relative;
    border-bottom:1px solid var(--border)
}
.product-card-image img{
    width:100%;height:100%;object-fit:contain;display:block
}
.product-card-image svg{color:var(--gray-300);width:40px;height:40px}

.product-card-body{
    padding:12px 12px 4px;flex:1;
    display:flex;flex-direction:column
}

.product-card-category{
    font-size:9px;color:var(--gray-500);font-weight:700;
    text-transform:uppercase;letter-spacing:0.07em;margin-bottom:6px;
    display:inline-block;background:none;border:none;
    padding:0;border-radius:0;align-self:flex-start;
    min-height:11px
}

.product-card-name{
    font-size:12.5px;font-weight:600;color:var(--black);
    margin-bottom:8px;line-height:1.35;
    display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
    overflow:hidden;text-overflow:ellipsis;letter-spacing:-0.005em;
    min-height:2.7em
}
.product-card-name a{color:inherit;text-decoration:none}

.product-card-footer{
    display:flex;flex-direction:column;gap:8px;
    padding:4px 12px 12px;margin-top:auto
}

.product-price{font-size:14px;font-weight:700;color:var(--black);letter-spacing:-0.01em}
.product-price-free{color:var(--black)}

/* ---------- Buttons ---------- */
.btn-buy{
    display:flex;align-items:center;justify-content:center;gap:6px;
    padding:0 14px;height:36px;border-radius:var(--radius-sm);
    font-size:12px;font-weight:600;border:1px solid var(--black);cursor:pointer;
    text-decoration:none;width:100%;
    letter-spacing:0.01em;
    background:var(--black);color:var(--white)
}

.btn-buy-primary{
    background:var(--black);color:var(--white);border:1px solid var(--black)
}

.btn-buy-free{
    background:var(--white);color:var(--black);border:1px solid var(--black)
}

.btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    padding:0 24px;height:46px;border-radius:var(--radius-sm);font-size:14px;font-weight:600;
    border:1px solid var(--black);cursor:pointer;text-decoration:none;
    letter-spacing:0.01em;
    background:var(--black);color:var(--white)
}
.btn-success{background:var(--white);color:var(--black);border:1px solid var(--black)}
.btn-lg{padding:0 36px;height:52px;font-size:15px}
.btn-block{display:flex;width:100%}

/* ---------- Product detail ---------- */
.product-detail{
    display:grid;grid-template-columns:1fr 1fr;
    gap:56px;align-items:start
}

.product-detail-image{
    width:100%;background:var(--off-white);
    border-radius:0;overflow:hidden;
    display:flex;align-items:center;justify-content:center;
    padding:48px;box-shadow:none;
    border:1px solid var(--border);
    position:sticky;top:90px
}
.product-detail-image img{width:100%;height:auto;object-fit:contain;display:block}

.product-detail-info h1{
    font-size:28px;font-weight:700;color:var(--black);
    margin-bottom:12px;letter-spacing:-0.02em;line-height:1.2
}

.product-detail-meta{
    color:var(--gray-500);font-size:13px;margin-bottom:24px;
    display:flex;align-items:center;gap:8px;
    text-transform:uppercase;letter-spacing:0.05em;font-weight:600
}
.product-detail-meta::before{
    content:'';display:block;width:6px;height:6px;
    background:var(--success);border-radius:50%
}

.product-detail-price{
    font-size:30px;font-weight:700;color:var(--black);
    margin-bottom:28px;letter-spacing:-0.02em
}
.product-detail-price-free{color:var(--black)}

.product-detail-desc{
    color:var(--gray-700);font-size:15px;line-height:1.8;
    margin-bottom:32px;white-space:pre-line;
    background:var(--white);padding:24px 28px;
    border-radius:0;
    border:1px solid var(--border)
}

.btn-buy-lg{
    padding:0 36px;height:auto;font-size:15px;
    border-radius:var(--radius-sm);width:100%;justify-content:center;
    padding-top:15px;padding-bottom:15px
}

/* ---------- Checkout ---------- */
.checkout-card{
    background:var(--white);border-radius:0;
    box-shadow:none;max-width:560px;margin:0 auto;
    overflow:hidden;border:1px solid var(--border)
}

.checkout-header{
    background:var(--black);
    color:var(--white);padding:28px 32px;position:relative;overflow:hidden
}
.checkout-header h2{font-size:18px;font-weight:700;letter-spacing:-0.01em}
.checkout-header p{font-size:13px;color:var(--gray-300);margin-top:4px}

.checkout-body{padding:32px}

.checkout-product{
    display:flex;gap:16px;align-items:center;
    padding-bottom:18px;margin-bottom:18px;
    border-bottom:1px solid var(--border)
}
.checkout-product-image{
    width:60px;height:60px;border-radius:0;
    background:var(--off-white);overflow:hidden;flex-shrink:0;
    display:flex;align-items:center;justify-content:center;
    border:1px solid var(--border)
}
.checkout-product-image img{width:100%;height:100%;object-fit:contain;display:block}
.checkout-product-name{font-size:15px;font-weight:600;color:var(--black)}
.checkout-product-price{font-size:14px;color:var(--gray-700);margin-top:2px;font-weight:500}

.checkout-total{
    display:flex;justify-content:space-between;align-items:center;
    padding:16px 0;margin-bottom:28px;font-size:17px;font-weight:700;
    border-top:1px solid var(--border);letter-spacing:-0.01em
}

.form-group{margin-bottom:20px}
.form-label{
    display:block;font-size:12px;font-weight:700;color:var(--black);
    margin-bottom:7px;letter-spacing:0.03em;text-transform:uppercase
}
.form-input,.form-select,.form-textarea{
    width:100%;padding:13px 16px;
    border:1px solid var(--gray-300);border-radius:var(--radius-sm);
    font-size:15px;color:var(--black);background:var(--white);
    appearance:none;-webkit-appearance:none;
    box-shadow:none
}
.form-input:focus,.form-select:focus,.form-textarea:focus{
    border-color:var(--black)
}
.form-input::placeholder,.form-textarea::placeholder{color:var(--gray-300)}
.form-textarea{resize:vertical;min-height:100px;line-height:1.6}
.form-select{
    background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23111111' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat:no-repeat;background-position:right 14px center;
    padding-right:42px
}
.form-hint{font-size:12px;color:var(--gray-500);margin-top:5px;line-height:1.4}
.form-error{font-size:12px;color:var(--danger);margin-top:5px;font-weight:600}

.payment-methods-list{display:flex;flex-direction:column;gap:10px;margin-bottom:28px}
.payment-method-option{
    display:flex;align-items:center;gap:14px;
    padding:14px 18px;border:1px solid var(--gray-300);
    border-radius:var(--radius-sm);cursor:pointer;
    background:var(--white);position:relative
}
.payment-method-option.selected{
    border-color:var(--black);background:var(--off-white)
}
.payment-method-option input[type="radio"]{display:none}

.payment-method-option .pm-radio{
    width:18px;height:18px;border-radius:50%;
    border:2px solid var(--gray-300);
    display:flex;align-items:center;justify-content:center;
    flex-shrink:0
}
.payment-method-option.selected .pm-radio{border-color:var(--black)}
.payment-method-option.selected .pm-radio::after{
    content:'';width:8px;height:8px;border-radius:50%;
    background:var(--black)
}

.payment-method-info{flex:1;min-width:0}
.payment-method-info h4{font-size:14px;font-weight:600;color:var(--black)}
.payment-method-info p{font-size:12px;color:var(--gray-500);margin-top:2px}

.payment-method-qr{
    width:52px;height:52px;border-radius:0;
    object-fit:contain;border:1px solid var(--border);
    background:var(--white);padding:4px
}

.file-upload{
    border:1px dashed var(--gray-300);border-radius:var(--radius-sm);
    padding:32px 24px;text-align:center;cursor:pointer;
    background:var(--off-white);position:relative
}
.file-upload.dragover{border-color:var(--black);background:var(--white)}
.file-upload input{display:none}
.file-upload-text{font-size:14px;color:var(--gray-700);font-weight:500}
.file-upload-hint{font-size:12px;color:var(--gray-500);margin-top:6px}
.file-upload-preview{
    margin-top:10px;font-size:13px;color:var(--success);font-weight:600;
    display:flex;align-items:center;justify-content:center;gap:6px
}

.checkout-submit{
    width:100%;padding:0 24px;height:50px;font-size:15px;font-weight:700;
    border:1px solid var(--black);border-radius:var(--radius-sm);cursor:pointer;
    background:var(--black);color:var(--white);
    letter-spacing:0.02em;box-shadow:none;position:relative;overflow:hidden;
    text-transform:uppercase
}
.checkout-submit:disabled{
    background:var(--gray-200);color:var(--gray-500);border-color:var(--gray-200);
    cursor:not-allowed;box-shadow:none
}

/* ---------- Alerts / badges ---------- */
.alert{
    padding:14px 18px;border-radius:var(--radius-sm);font-size:14px;
    margin-bottom:22px;font-weight:500;display:flex;align-items:center;
    gap:10px;line-height:1.5;border:1px solid transparent
}
.alert-success{background:var(--success-bg);color:#166534;border-color:var(--success-border)}
.alert-error{background:var(--danger-bg);color:#991B1B;border-color:var(--danger-border)}
.alert-warning{background:var(--warning-bg);color:#92400E;border-color:var(--warning-border)}
.alert-info{background:var(--info-bg);color:#1E40AF;border-color:var(--info-border)}

.success-icon{
    width:76px;height:76px;border-radius:50%;background:var(--white);
    display:flex;align-items:center;justify-content:center;
    margin:0 auto 24px;position:relative;
    border:2px solid var(--black)
}
.success-icon svg{color:var(--black);width:32px;height:32px}

.success-title{
    text-align:center;font-size:22px;font-weight:700;
    color:var(--black);margin-bottom:8px;letter-spacing:-0.02em
}
.success-text{
    text-align:center;color:var(--gray-700);font-size:15px;
    margin-bottom:32px;line-height:1.6;max-width:380px;
    margin-left:auto;margin-right:auto
}

.empty-state{text-align:center;padding:80px 24px;color:var(--gray-300)}
.empty-state svg{width:64px;height:64px;margin:0 auto 16px;display:block;color:var(--gray-300)}
.empty-state p{margin-top:12px;font-size:15px;color:var(--gray-500);font-weight:500}

.back-link{
    display:inline-flex;align-items:center;gap:8px;font-size:14px;
    color:var(--black);margin-bottom:28px;text-decoration:none;font-weight:600;
    padding:6px 0;border-bottom:1px solid var(--black)
}

.badge{
    display:inline-flex;align-items:center;padding:4px 12px;
    border-radius:var(--radius-full);font-size:12px;font-weight:600;
    letter-spacing:0.02em;line-height:1.4;border:1px solid transparent
}
.badge-success{background:var(--success-bg);color:#166534;border-color:var(--success-border)}
.badge-danger{background:var(--danger-bg);color:#991B1B;border-color:var(--danger-border)}
.badge-warning{background:var(--warning-bg);color:#92400E;border-color:var(--warning-border)}
.badge-info{background:var(--info-bg);color:#1E40AF;border-color:var(--info-border)}
.badge-primary{background:var(--black);color:var(--white);border-color:var(--black)}

.card{
    background:var(--white);border-radius:0;
    box-shadow:none;border:1px solid var(--border);overflow:hidden
}
.card-body{padding:28px}
.card-title{font-size:17px;font-weight:700;color:var(--black);margin-bottom:16px;letter-spacing:-0.01em}

.order-info{
    background:var(--off-white);border:1px solid var(--border);
    border-radius:0;padding:24px;margin-top:24px
}
.order-info-item{
    display:flex;justify-content:space-between;align-items:center;
    padding:12px 0;font-size:14px;border-bottom:1px solid var(--border)
}
.order-info-item:last-child{border-bottom:none;padding-bottom:0}
.order-info-item:first-child{padding-top:0}
.order-info-label{color:var(--gray-500);font-weight:500}
.order-info-value{color:var(--black);font-weight:600;text-align:right;word-break:break-all}

.text-center{text-align:center}
.mt-4{margin-top:16px}
.mb-4{margin-bottom:16px}

@media(max-width:1400px){
    .product-grid{grid-template-columns:repeat(auto-fit,minmax(160px,190px))}
}

@media(max-width:1100px){
    .product-grid{grid-template-columns:repeat(auto-fit,minmax(150px,180px))}
    .product-detail{gap:40px}
    .product-detail-image{position:relative;top:auto}
}

@media(max-width:768px){
    .container{padding:0 20px}
    .site-main{padding:28px 0 56px}
    .site-header{padding:14px 0}
    .site-logo{font-size:18px}
    .site-tagline{font-size:11px}
    .product-detail{grid-template-columns:1fr;gap:28px}
    .product-detail-image{padding:28px}
    .product-detail-info h1{font-size:22px}
    .product-detail-price{font-size:26px}
    .product-grid{grid-template-columns:repeat(2,minmax(0,1fr));justify-content:stretch}
    .product-card-image{padding:12px}
    .product-card-body{padding:10px 10px 4px}
    .product-card-category{font-size:8px;margin-bottom:5px}
    .product-card-name{font-size:12px;margin-bottom:7px;line-height:1.3}
    .product-card-footer{padding:4px 10px 10px;gap:7px}
    .product-price{font-size:13px}
    .btn-buy{height:36px;padding:0 12px;font-size:11px}
    .category-filter{gap:6px;margin-bottom:24px}
    .category-chip{padding:7px 16px;font-size:12px}
    .checkout-card{margin:0 16px}
    .checkout-header{padding:22px 24px}
    .checkout-header h2{font-size:16px}
    .checkout-body{padding:24px}
    .form-input,.form-select,.form-textarea{padding:12px 14px;font-size:14px}
    .payment-method-option{padding:12px 14px;gap:12px}
    .payment-method-qr{width:46px;height:46px}
    .file-upload{padding:24px 16px}
    .checkout-submit{height:48px;font-size:14px}
    .success-title{font-size:20px}
    .success-text{font-size:14px}
    table{font-size:13px}
    th,td{padding:12px 14px}
    .alert{padding:12px 14px;font-size:13px}
}

@media(max-width:480px){
    .container{padding:0 16px}
    .site-main{padding:20px 0 48px}
    .product-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
    .product-card-image{padding:10px}
    .product-card-body{padding:8px 8px 2px}
    .product-card-category{font-size:8px;margin-bottom:4px}
    .product-card-name{font-size:11.5px;margin-bottom:6px}
    .product-card-footer{padding:2px 8px 8px;gap:6px}
    .product-price{font-size:12.5px}
    .btn-buy{height:34px;padding:0 10px;font-size:10.5px}
    .category-filter{gap:5px;margin-bottom:20px}
    .category-chip{padding:6px 14px;font-size:11px}
    .checkout-card{margin:0 12px}
    .checkout-header{padding:20px 20px}
    .checkout-body{padding:20px}
    .form-label{font-size:11px;margin-bottom:5px}
    .form-input,.form-select,.form-textarea{padding:11px 12px;font-size:14px}
    .payment-method-option{padding:12px 14px}
    .file-upload{padding:20px 12px}
    .checkout-submit{height:46px;font-size:13px}
    .product-detail-image{padding:16px}
    .product-detail-info h1{font-size:20px}
    .product-detail-price{font-size:24px}
    .btn-buy-lg{padding:12px 20px;font-size:14px}
    .success-icon{width:60px;height:60px;margin-bottom:20px}
    .success-icon svg{width:26px;height:26px}
    .success-title{font-size:18px}
    .success-text{font-size:13px;margin-bottom:24px}
    .empty-state{padding:56px 16px}
    .order-info{padding:16px}
    .order-info-item{font-size:13px;padding:10px 0}
}

@media(max-width:380px){
    .product-card-name{font-size:11px}
    .product-price{font-size:12px}
    .btn-buy{height:32px;font-size:10px}
    .category-chip{padding:5px 12px;font-size:10px}
}

@media(prefers-reduced-motion:reduce){
    *,*::before,*::after{
        animation-duration:0.01ms !important;
        animation-iteration-count:1 !important;
        transition-duration:0.01ms !important;
        scroll-behavior:auto !important
    }
}