:root{
  --bg:#f5f6f8; --surface:#ffffff; --ink:#1c2230; --muted:#6b7280;
  --line:#e5e7eb; --brand:#2563eb; --brand-dark:#1d4ed8; --brand-soft:#eff4ff;
  --ok:#16a34a; --warn:#d97706; --danger:#dc2626; --radius:12px;
  --shadow:0 1px 3px rgba(16,24,40,.08),0 1px 2px rgba(16,24,40,.04);
  --shadow-lg:0 10px 30px rgba(16,24,40,.10);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.55;font-size:15px}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{margin:0 0 .5em;line-height:1.25}
h1{font-size:1.9rem}h2{font-size:1.4rem}h3{font-size:1.15rem}
img{max-width:100%;display:block}
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 18px}

/* Header */
.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header-inner{display:flex;align-items:center;gap:18px;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:var(--brand);color:#fff;font-size:.85rem;letter-spacing:.5px}
.main-nav{display:flex;gap:16px;margin-left:8px;flex:1}
.main-nav a{color:#374151;font-weight:500;font-size:.92rem}
.header-actions{display:flex;align-items:center;gap:12px}
.icon-link{position:relative;font-size:1.25rem;line-height:1}
.badge{position:absolute;top:-8px;right:-10px;background:var(--danger);color:#fff;border-radius:999px;font-size:.68rem;padding:1px 6px;font-weight:700}
.user-menu{display:flex;align-items:center;gap:8px;position:relative}
.dropdown{position:relative}
.dd-name{font-weight:600;font-size:.9rem;cursor:default}
.dd-panel{display:none;position:absolute;right:0;top:130%;background:var(--surface);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow-lg);min-width:210px;padding:6px;z-index:60}
.dropdown:hover .dd-panel{display:block}
.dd-panel a,.dd-panel .linklike{display:block;width:100%;text-align:left;padding:9px 12px;border-radius:8px;color:var(--ink);font-size:.9rem;background:none;border:0;cursor:pointer;font-family:inherit}
.dd-panel a:hover,.dd-panel .linklike:hover{background:var(--brand-soft);text-decoration:none}
.nav-toggle{display:none;background:none;border:0;font-size:1.4rem;cursor:pointer}

/* Flash */
.flash-wrap{padding-top:14px}
.flash{padding:11px 15px;border-radius:10px;margin-bottom:10px;font-size:.92rem;border:1px solid transparent}
.flash-success{background:#ecfdf5;color:#065f46;border-color:#a7f3d0}
.flash-danger{background:#fef2f2;color:#991b1b;border-color:#fecaca}
.flash-warning{background:#fffbeb;color:#92400e;border-color:#fde68a}
.flash-info{background:var(--brand-soft);color:#1e40af;border-color:#bfdbfe}

/* Layout */
.site-main{padding:28px 0 60px;min-height:60vh}
.page-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:22px;flex-wrap:wrap}
.muted{color:var(--muted)}
.small{font-size:.85rem}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;justify-content:center;padding:10px 18px;border-radius:10px;border:1px solid transparent;background:var(--brand);color:#fff;font-weight:600;font-size:.92rem;cursor:pointer;font-family:inherit;transition:.15s}
.btn:hover{background:var(--brand-dark);text-decoration:none}
.btn-outline{background:transparent;border-color:var(--line);color:var(--ink)}
.btn-outline:hover{background:#f3f4f6}
.btn-ghost{background:#eef2ff;color:var(--brand-dark)}
.btn-ghost:hover{background:#e0e7ff}
.btn-danger{background:var(--danger)}
.btn-danger:hover{background:#b91c1c}
.btn-ok{background:var(--ok)}
.btn-ok:hover{background:#15803d}
.btn-sm{padding:6px 12px;font-size:.84rem}
.btn-block{width:100%}
.linklike{background:none;border:0;color:var(--brand);cursor:pointer;font:inherit;padding:0}
.linklike:hover{text-decoration:underline}

/* Cards & grid */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}
.grid{display:grid;gap:20px}
.grid-products{grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}
.stack{display:flex;flex-direction:column;gap:16px}
.row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.between{justify-content:space-between}

/* Product card */
.product-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow);transition:.15s}
.product-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.product-thumb{aspect-ratio:4/3;background:linear-gradient(135deg,#eef2ff,#f8fafc);display:grid;place-items:center;overflow:hidden}
.product-thumb img{width:100%;height:100%;object-fit:cover}
.product-thumb .ph{font-size:2.2rem;opacity:.35}
.product-body{padding:14px;display:flex;flex-direction:column;gap:6px;flex:1}
.product-body h3{font-size:1rem;margin:0}
.product-brand{font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.4px}
.product-price{font-size:1.15rem;font-weight:700;margin-top:auto}
.chip{display:inline-block;padding:3px 10px;border-radius:999px;font-size:.75rem;background:var(--brand-soft);color:var(--brand-dark);font-weight:600}
.chip-gray{background:#f3f4f6;color:#4b5563}
.chip-ok{background:#ecfdf5;color:#065f46}
.chip-warn{background:#fffbeb;color:#92400e}
.chip-danger{background:#fef2f2;color:#991b1b}

/* Hero */
.hero{background:linear-gradient(135deg,#1e3a8a,#2563eb);color:#fff;border-radius:16px;padding:52px 40px;margin-bottom:30px}
.hero h1{font-size:2.3rem;color:#fff}
.hero p{color:#dbeafe;max-width:600px;font-size:1.05rem}
.hero .btn-outline{border-color:rgba(255,255,255,.6);color:#fff}
.hero .btn-outline:hover{background:rgba(255,255,255,.12)}

/* Filters */
.filters{display:flex;gap:12px;flex-wrap:wrap;align-items:end;margin-bottom:22px}
.field{display:flex;flex-direction:column;gap:5px}
.field label{font-size:.82rem;font-weight:600;color:#374151}
input,select,textarea{font-family:inherit;font-size:.92rem;padding:9px 12px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink);width:100%}
input:focus,select:focus,textarea:focus{outline:2px solid #bfdbfe;border-color:var(--brand)}
textarea{min-height:90px;resize:vertical}

/* Tables */
.table-wrap{overflow-x:auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;font-size:.9rem}
th,td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}
th{background:#f9fafb;font-size:.78rem;text-transform:uppercase;letter-spacing:.4px;color:#6b7280}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:#fafbfc}

/* Stat cards */
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.stat .num{font-size:1.7rem;font-weight:700}
.stat .lbl{color:var(--muted);font-size:.85rem}

/* Auth */
.auth-card{max-width:440px;margin:30px auto}
.form-row{margin-bottom:15px}
.form-row label{display:block;margin-bottom:5px;font-weight:600;font-size:.87rem}
.error-text{color:var(--danger);font-size:.82rem;margin-top:4px}
.checkline{display:flex;align-items:center;gap:8px}
.checkline input{width:auto}

/* Admin */
.admin-shell{display:grid;grid-template-columns:230px 1fr;gap:26px;align-items:start}
.admin-side{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow);position:sticky;top:82px}
.admin-side .group{font-size:.72rem;text-transform:uppercase;letter-spacing:.5px;color:#9ca3af;margin:14px 10px 6px}
.admin-side a{display:block;padding:9px 12px;border-radius:9px;color:#374151;font-size:.9rem;font-weight:500}
.admin-side a:hover{background:#f3f4f6;text-decoration:none}
.admin-side a.active{background:var(--brand-soft);color:var(--brand-dark);font-weight:600}
.admin-main{min-width:0}

/* Timeline */
.timeline{list-style:none;padding:0;margin:0}
.timeline li{position:relative;padding:0 0 18px 26px;border-left:2px solid var(--line);margin-left:6px}
.timeline li:last-child{border-left-color:transparent}
.timeline li::before{content:"";position:absolute;left:-7px;top:2px;width:12px;height:12px;border-radius:50%;background:var(--brand);border:2px solid #fff;box-shadow:0 0 0 1px var(--line)}
.timeline .t-time{font-size:.8rem;color:var(--muted)}

/* Pagination */
.pagination{display:flex;gap:6px;margin-top:22px;justify-content:center}
.pagination .page{padding:7px 13px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink);font-size:.88rem}
.pagination .page.active{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}
.pagination .page:hover{text-decoration:none;background:#f3f4f6}
.pagination .page.active:hover{background:var(--brand-dark)}

/* Misc */
.empty{text-align:center;padding:50px 20px;color:var(--muted)}
.divider{height:1px;background:var(--line);margin:20px 0}
.price-lg{font-size:1.6rem;font-weight:700}
.notice{padding:14px 16px;border-radius:10px;background:var(--brand-soft);border:1px solid #bfdbfe;font-size:.9rem}
.detail-list{display:grid;grid-template-columns:auto 1fr;gap:6px 18px;font-size:.9rem}
.detail-list dt{color:var(--muted)}
.detail-list dd{margin:0;font-weight:500}

@media(max-width:900px){
  .admin-shell{grid-template-columns:1fr}
  .admin-side{position:static}
}
@media(max-width:760px){
  .nav-toggle{display:block}
  .main-nav{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;padding:12px 18px;gap:6px}
  body.nav-open .main-nav{display:flex}
  .header-inner{gap:10px}
  .hero{padding:36px 24px}
  .hero h1{font-size:1.7rem}
}