/* =========================================================
   Store UI — Professional Responsive Design System
   Frontend only: no business/database logic changed.
   ========================================================= */
:root{
  --primary:#111827;
  --primary-dark:#0b1220;
  --background:#f5f7fb;
  --surface:#ffffff;
  --surface-soft:#f8fafc;
  --text:#111827;
  --muted:#667085;
  --border:#e4e7ec;
  --success:#067647;
  --success-bg:#ecfdf3;
  --warning:#b54708;
  --warning-bg:#fffaeb;
  --danger:#b42318;
  --danger-bg:#fef3f2;
  --info:#175cd3;
  --info-bg:#eff8ff;
  --shadow:0 10px 30px rgba(16,24,40,.07);
  --shadow-sm:0 2px 8px rgba(16,24,40,.06);
  --radius:14px;
  --radius-sm:10px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;
  background:var(--background);
  color:var(--text);
  line-height:1.55;
}
a{color:#175cd3}
a:hover{color:#1849a9}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
img{max-width:100%;display:block}
.container{width:min(1120px,calc(100% - 32px));margin:0 auto;padding:24px 0}
.narrow{width:min(720px,calc(100% - 32px))}
.topbar{
  background:var(--primary);
  color:#fff;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.nav{
  min-height:70px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:20px;
}
.brand{font-size:21px;font-weight:800;color:#fff;text-decoration:none;letter-spacing:-.02em}
.admin-link,.nav a{color:#fff;text-decoration:none}
.admin-link{opacity:.9}
.admin-link:hover{opacity:1;color:#fff}
.nav-links{display:flex;align-items:center;gap:18px}
.hero{padding:58px 0 34px}
.hero h1{font-size:clamp(34px,5vw,54px);line-height:1.05;letter-spacing:-.04em;margin:0 0 16px}
.hero p{max-width:720px;font-size:18px;color:var(--muted);margin:0}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:18px;margin:34px 0 16px}
.section-head h2,.container>h2{margin:0}
.grid{display:grid;gap:20px}
.categories{grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}
.products{grid-template-columns:repeat(auto-fill,minmax(245px,1fr))}
.card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:var(--shadow-sm);
}
a.card{text-decoration:none;color:inherit}
a.card:hover{border-color:#cbd5e1;box-shadow:var(--shadow);transform:translateY(-1px)}
.card,.product{transition:box-shadow .18s ease,border-color .18s ease,transform .18s ease}
.category{padding:22px}
.category h3{margin:0 0 7px}
.category p{margin:0;color:var(--muted)}
.product img,.placeholder{width:100%;height:220px;object-fit:cover;background:#eef2f6}
.placeholder{display:flex;align-items:center;justify-content:center;color:#98a2b3;font-weight:600}
.product h3{margin:8px 0 6px;line-height:1.25}
.product p{color:var(--muted);margin:0 0 12px}
.product small,.muted{color:var(--muted)}
.pad{padding:20px}
.product-page{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  gap:46px;
  margin-top:30px;
  align-items:start;
}
.main-image{width:100%;max-height:620px;object-fit:contain;background:#fff;border:1px solid var(--border);border-radius:var(--radius)}
.placeholder.large{height:460px;border:1px solid var(--border);border-radius:var(--radius)}
.product-page h1{font-size:clamp(34px,4vw,48px);line-height:1.08;letter-spacing:-.035em;margin:14px 0}
.lead{font-size:19px;color:var(--muted)}
.price{font-size:34px;font-weight:800;letter-spacing:-.02em;margin:20px 0}
.description{line-height:1.8;margin-bottom:26px;color:#344054}
.buy,.share,.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  border:1px solid transparent;
  border-radius:10px;
  padding:12px 18px;
  min-height:44px;
  font-weight:700;
  text-decoration:none;
  transition:.18s ease;
}
.buy{background:var(--primary);color:#fff}
.buy:hover{background:var(--primary-dark);color:#fff;transform:translateY(-1px)}
.share{background:#eef2f6;color:var(--primary)}
.share:hover{background:#e2e8f0;color:var(--primary)}
.btn-secondary{background:#fff;border-color:var(--border);color:var(--text)}
.btn-secondary:hover{background:var(--surface-soft)}
.btn-danger{background:#fff;border-color:#fecdca;color:var(--danger)}
.btn-danger:hover{background:var(--danger-bg)}
.btn-success{background:#067647;color:#fff}
.small{min-height:38px;padding:9px 13px;font-size:14px}
.actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:20px 0}
.tag,.badge{
  display:inline-flex;
  align-items:center;
  width:max-content;
  background:#eef2f6;
  color:#344054;
  padding:5px 10px;
  border-radius:999px;
  font-size:12px;
  font-weight:700;
}
.badge.success{background:var(--success-bg);color:var(--success)}
.badge.warning{background:var(--warning-bg);color:var(--warning)}
.badge.danger{background:var(--danger-bg);color:var(--danger)}
.badge.info{background:var(--info-bg);color:var(--info)}
.table-wrap{
  width:100%;
  overflow-x:auto;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow-sm);
}
table{width:100%;min-width:680px;border-collapse:separate;border-spacing:0}
th,td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--border);vertical-align:middle}
th{background:var(--surface-soft);font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:#475467;position:sticky;top:0;z-index:1}
tr:last-child td{border-bottom:0}
tbody tr:hover td{background:#fbfcfe}
label{display:block;font-weight:650;margin:0 0 16px}
input,textarea,select{
  display:block;
  width:100%;
  padding:12px 13px;
  margin-top:7px;
  border:1px solid #d0d5dd;
  border-radius:10px;
  background:#fff;
  color:var(--text);
  outline:none;
  transition:border-color .15s,box-shadow .15s;
}
input:focus,textarea:focus,select:focus{
  border-color:#84adff;
  box-shadow:0 0 0 4px rgba(46,144,250,.12);
}
input[type=file]{padding:10px}
textarea{resize:vertical;min-height:130px}
small{font-weight:400;color:var(--muted)}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}
.form-full{grid-column:1/-1}
.form-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}
.error,.alert{
  border:1px solid #fecdca;
  background:var(--danger-bg);
  color:var(--danger);
  border-radius:10px;
  padding:12px 14px;
}
.success-alert{border-color:#abefc6;background:var(--success-bg);color:var(--success)}
.warning-alert{border-color:#fedf89;background:var(--warning-bg);color:var(--warning)}
.info-alert{border-color:#b2ddff;background:var(--info-bg);color:var(--info)}
.success{text-align:center;padding:80px 0}
.success h1{font-size:42px}
.hidden{display:none!important}
.modal{
  position:fixed;
  inset:0;
  background:rgba(16,24,40,.72);
  display:flex;
  align-items:center;
  justify-content:center;
  padding:20px;
  z-index:100;
  backdrop-filter:blur(3px);
}
.modal-card{
  position:relative;
  background:#fff;
  border-radius:18px;
  max-width:600px;
  width:100%;
  max-height:90vh;
  overflow:auto;
  padding:30px;
  box-shadow:0 24px 70px rgba(0,0,0,.2);
}
.close{
  position:absolute;
  right:14px;
  top:12px;
  width:38px;
  height:38px;
  border:0;
  background:#f2f4f7;
  border-radius:50%;
  font-size:24px;
  line-height:1;
}
.close:hover{background:#e4e7ec}

/* Admin layout */
.admin-body{background:#f5f7fb}
.admin-layout{min-height:100vh;display:flex}
.admin-sidebar{
  width:250px;
  flex:0 0 250px;
  background:var(--primary-dark);
  color:#fff;
  padding:22px 14px;
  position:sticky;
  top:0;
  height:100vh;
  overflow-y:auto;
}
.admin-brand{padding:6px 12px 24px;font-size:20px;font-weight:800}
.admin-brand small{display:block;font-size:12px;color:#98a2b3;font-weight:500;margin-top:3px}
.admin-nav{display:grid;gap:5px}
.admin-nav a{
  display:flex;
  align-items:center;
  gap:10px;
  padding:11px 12px;
  border-radius:9px;
  color:#d0d5dd;
  text-decoration:none;
  font-weight:600;
}
.admin-nav a:hover,.admin-nav a.active{background:#1f2937;color:#fff}
.admin-main{min-width:0;flex:1}
.admin-topbar{
  height:72px;
  background:#fff;
  border-bottom:1px solid var(--border);
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0 clamp(18px,3vw,32px);
  position:sticky;
  top:0;
  z-index:20;
}
.admin-topbar h1{font-size:20px;margin:0}
.admin-top-actions{display:flex;align-items:center;gap:10px}
.admin-content{width:min(1320px,100%);margin:0 auto;padding:28px clamp(18px,3vw,32px)}
.mobile-menu-btn{display:none;border:1px solid var(--border);background:#fff;border-radius:9px;width:42px;height:42px;font-size:20px}
.kpi-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-bottom:28px}
.kpi-card{
  background:#fff;border:1px solid var(--border);border-radius:14px;padding:20px;
  box-shadow:var(--shadow-sm);
}
.kpi-label{font-size:13px;color:var(--muted);font-weight:600}
.kpi-value{font-size:30px;line-height:1.1;font-weight:800;margin-top:8px}
.kpi-icon{
  width:40px;height:40px;border-radius:10px;background:#eef2ff;color:#3538cd;
  display:flex;align-items:center;justify-content:center;font-weight:800;margin-bottom:14px;
}
.admin-section{margin-top:28px}
.admin-section-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:12px}
.admin-section-head h2{margin:0;font-size:19px}
.table-title{font-size:15px;font-weight:700}
.order-customer{line-height:1.35}
.order-customer small{display:block}
.empty-state{text-align:center;padding:38px;color:var(--muted)}
.auth-page{
  min-height:100vh;display:grid;place-items:center;
  background:radial-gradient(circle at top right,#e9efff 0,#f5f7fb 40%,#f5f7fb 100%);
}
.auth-card{width:min(440px,calc(100% - 32px));background:#fff;border:1px solid var(--border);border-radius:18px;padding:32px;box-shadow:0 20px 55px rgba(16,24,40,.1)}
.auth-card h1{margin:0 0 7px;font-size:28px}
.auth-card .muted{margin:0 0 24px}
.auth-logo{font-weight:800;color:var(--primary);font-size:20px;margin-bottom:28px}
.footer-note{color:var(--muted);font-size:13px;margin-top:22px}

/* Receipt */
.receipt{width:min(760px,calc(100% - 32px));margin:40px auto;background:#fff;border:1px solid var(--border);border-radius:16px;padding:34px;box-shadow:var(--shadow)}
.receipt-head{display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--border);padding-bottom:22px;margin-bottom:22px}
.receipt table{min-width:0}
.receipt-actions{margin-bottom:20px}

@media(max-width:1000px){
  .admin-sidebar{width:220px;flex-basis:220px}
  .kpi-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:760px){
  .container{width:min(100% - 24px,1120px);padding:18px 0}
  .hero{padding:38px 0 24px}
  .product-page{grid-template-columns:1fr;gap:24px}
  .placeholder.large{height:300px}
  .form-grid{grid-template-columns:1fr}
  .form-full{grid-column:auto}
  .modal-card{padding:24px 20px}
  .admin-layout{display:block}
  .admin-sidebar{
    position:fixed;left:-270px;top:0;bottom:0;height:100vh;width:260px;z-index:50;
    transition:left .2s ease;box-shadow:20px 0 50px rgba(0,0,0,.18)
  }
  .admin-sidebar.open{left:0}
  .mobile-menu-btn{display:inline-flex;align-items:center;justify-content:center}
  .admin-topbar{height:64px}
  .admin-topbar h1{font-size:17px}
  .admin-content{padding:20px 12px}
  .kpi-grid{grid-template-columns:1fr}
  .admin-section-head{align-items:flex-start;flex-direction:column}
  table{min-width:720px}
  .receipt{padding:22px;margin:20px auto}
  .receipt-head{flex-direction:column}
}
@media(max-width:480px){
  .buy,.share,.btn{width:100%;margin-right:0}
  .actions,.form-actions{display:grid;grid-template-columns:1fr}
  .hero h1{font-size:34px}
  .product img,.placeholder{height:200px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{scroll-behavior:auto!important;transition:none!important}
}
@media print{
  .no-print{display:none!important}
  body{background:#fff}
  .receipt{box-shadow:none;border:0;margin:0;width:100%}
}