:root{--bg:#f7f7f5;--card:#fff;--text:#171717;--muted:#6b7280;--line:#e5e7eb;--accent:#ffca28;--dark:#111827;--red:#dc2626;--green:#15803d}*{box-sizing:border-box}body{margin:0;font-family:Inter,Arial,sans-serif;background:var(--bg);color:var(--text)}a{color:inherit;text-decoration:none}.container{max-width:1280px;margin:auto;padding:28px}.topbar{background:#111827;color:#fff;text-align:center;padding:9px;font-size:14px}.header{display:flex;gap:24px;align-items:center;padding:18px 28px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.brand{font-size:24px;font-weight:900;letter-spacing:-1px}.brand img{max-width:180px;max-height:46px}.header nav,.actions{display:flex;gap:16px;align-items:center}.search{flex:1}.search input{width:100%;padding:12px 16px;border:1px solid var(--line);border-radius:12px}.hero{padding:56px;border-radius:24px;background:linear-gradient(135deg,#fff3c4,#fff);margin:18px 0 36px}.hero h1{font-size:52px;max-width:720px;margin:0 0 12px}.hero p{font-size:20px;color:#4b5563;max-width:650px}.btn{display:inline-block;background:var(--dark);color:#fff;border:0;border-radius:10px;padding:12px 18px;font-weight:700;cursor:pointer}.btn.secondary{background:#fff;color:#111;border:1px solid var(--line)}.btn.danger{background:var(--red)}.grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}.card,.panel,.stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}.product-card img{width:100%;height:210px;object-fit:contain;background:#fff}.product-card h3{min-height:46px}.price{font-size:22px;font-weight:800}.old-price{text-decoration:line-through;color:var(--muted);margin-left:8px}.badge{display:inline-block;background:#fff3c4;padding:5px 8px;border-radius:999px;font-size:12px;font-weight:700}.muted{color:var(--muted)}.alert{padding:12px 16px;border-radius:10px;margin:10px 0}.success{background:#dcfce7;color:#166534}.error{background:#fee2e2;color:#991b1b}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.form-grid label,.form-stack label{display:flex;flex-direction:column;gap:6px;font-weight:600}.form-grid input,.form-grid select,.form-grid textarea,.form-stack input,.form-stack select,.form-stack textarea{padding:11px;border:1px solid var(--line);border-radius:9px;background:#fff}.full{grid-column:1/-1}.table-wrap{overflow:auto;background:#fff;border:1px solid var(--line);border-radius:14px}table{border-collapse:collapse;width:100%}th,td{text-align:left;padding:13px;border-bottom:1px solid var(--line);white-space:nowrap}th{font-size:12px;text-transform:uppercase;color:#6b7280}.admin-body{display:flex;min-height:100vh}.sidebar{width:245px;background:#111827;color:#fff;padding:24px;display:flex;flex-direction:column;gap:5px;position:fixed;top:0;bottom:0}.sidebar h2{font-size:18px}.sidebar a{padding:10px;border-radius:8px}.sidebar a:hover{background:#1f2937}.admin-main{margin-left:245px;width:calc(100% - 245px);padding:28px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.stat strong{font-size:28px;display:block}.toolbar{display:flex;gap:10px;align-items:center;justify-content:space-between;margin-bottom:16px}.product-detail{display:grid;grid-template-columns:1fr 1fr;gap:36px}.product-detail img{width:100%;max-height:520px;object-fit:contain;background:#fff;border-radius:18px}.footer{margin-top:60px;background:#111827;color:#fff;padding:36px max(28px,calc((100vw - 1280px)/2));display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}.footer div{display:flex;flex-direction:column;gap:7px}.install{max-width:760px;padding-top:60px}.account-nav{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px}.qty{width:70px;padding:8px}.checkout-grid{display:grid;grid-template-columns:2fr 1fr;gap:24px}@media(max-width:900px){.header{flex-wrap:wrap}.header nav{order:3;width:100%;overflow:auto}.grid,.stats{grid-template-columns:repeat(2,1fr)}.product-detail,.checkout-grid{grid-template-columns:1fr}.sidebar{position:static;width:100%;height:auto}.admin-body{display:block}.admin-main{margin:0;width:100%}.form-grid{grid-template-columns:1fr}.footer{grid-template-columns:1fr}}@media(max-width:560px){.container{padding:16px}.hero{padding:28px}.hero h1{font-size:34px}.grid,.stats{grid-template-columns:1fr}.actions{width:100%;justify-content:space-between}.search{order:4;width:100%;flex-basis:100%}}