:root{--bg:#f4f5f7;--surface:#fff;--primary:#2563eb;--primary-dark:#1d4ed8;--text:#111827;--muted:#6b7280;--border:#e5e7eb;--green:#16a34a;--radius:14px;--shadow:0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.04);--shadow-lg:0 10px 30px rgba(0,0,0,.12)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Inter',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;gap:20px;height:64px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);font-weight:800;font-size:20px}
.logo-mark{width:36px;height:36px;border-radius:10px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:800}
.logo-accent{color:var(--primary)}
.search-bar{flex:1;display:flex;gap:8px}
.search-bar input{flex:1;padding:10px 16px;border:1px solid var(--border);border-radius:10px;font-size:14px;outline:none;transition:border .2s}
.search-bar input:focus{border-color:var(--primary)}
.header-nav{display:flex;align-items:center;gap:14px}
.btn-primary{background:var(--primary);color:#fff;border:none;padding:10px 20px;border-radius:10px;font-weight:600;cursor:pointer;font-size:14px;transition:background .2s}
.btn-primary:hover{background:var(--primary-dark)}
.btn-sell{background:var(--green);color:#fff;border:none;padding:10px 18px;border-radius:10px;font-weight:600;cursor:pointer;font-size:14px;transition:opacity .2s}
.btn-sell:hover{opacity:.9}
.avatar{width:36px;height:36px;border-radius:50%;background:var(--border);display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--muted);cursor:pointer}
.category-strip{background:var(--surface);border-bottom:1px solid var(--border)}
.category-inner{display:flex;gap:8px;padding:12px 20px;overflow-x:auto}
.cat-btn{background:transparent;border:1px solid var(--border);padding:7px 16px;border-radius:20px;font-size:13px;font-weight:500;cursor:pointer;white-space:nowrap;transition:all .2s;color:var(--muted)}
.cat-btn:hover{border-color:var(--primary);color:var(--primary)}
.cat-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.hero{background:linear-gradient(135deg,#1e3a8a,#2563eb);color:#fff;padding:50px 0}
.hero-inner{display:flex;align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap}
.hero-text h1{font-size:38px;font-weight:800;line-height:1.2;margin-bottom:12px}
.hero-text h1 span{color:#93c5fd}
.hero-text p{font-size:16px;opacity:.9;margin-bottom:20px;max-width:420px}
.btn-lg{padding:14px 32px;font-size:16px;border-radius:12px}
.hero-stats{display:flex;gap:32px}
.stat{display:flex;flex-direction:column}
.stat-num{font-size:28px;font-weight:800}
.stat-label{font-size:13px;opacity:.8}
.section-header{display:flex;align-items:center;justify-content:space-between;margin:32px 0 20px}
.section-header h2{font-size:22px;font-weight:700}
.sort-wrap{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--muted)}
.sort-wrap select{padding:7px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px;outline:none;cursor:pointer}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px;padding-bottom:40px}
.card{background:var(--surface);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);cursor:pointer;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.card-img{width:100%;height:180px;object-fit:cover;background:var(--border);display:block}
.card-body{padding:14px}
.card-title{font-size:15px;font-weight:600;margin-bottom:6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.card-price{font-size:20px;font-weight:800;color:var(--primary)}
.card-meta{display:flex;justify-content:space-between;align-items:center;margin-top:8px;font-size:12px;color:var(--muted)}
.badge{padding:2px 8px;border-radius:6px;font-size:11px;font-weight:600;background:#dbeafe;color:#1e40af}
.badge.good{background:#dcfce7;color:#166534}
.badge.fair{background:#fef9c3;color:#854d0e}
.badge.new{background:#e0e7ff;color:#3730a3}
.empty-state{text-align:center;padding:60px 20px;color:var(--muted);font-size:16px}
.footer{background:var(--surface);border-top:1px solid var(--border);margin-top:40px}
.footer-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;padding:40px 20px}
.footer-col h4{font-size:16px;font-weight:700;margin-bottom:12px}
.footer-col p{font-size:14px;color:var(--muted);line-height:1.6}
.footer-col a{display:block;font-size:14px;color:var(--muted);text-decoration:none;margin-bottom:6px;transition:color .2s}
.footer-col a:hover{color:var(--primary)}
.footer-bottom{text-align:center;padding:16px;border-top:1px solid var(--border);font-size:13px;color:var(--muted)}
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:200;padding:20px}
.modal{background:var(--surface);border-radius:var(--radius);width:100%;max-width:500px;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg)}
.modal-detail{max-width:640px}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;border-bottom:1px solid var(--border)}
.modal-header h3{font-size:18px;font-weight:700}
.modal-close{background:none;border:none;font-size:20px;cursor:pointer;color:var(--muted)}
.modal-body{padding:22px;display:flex;flex-direction:column;gap:14px}
.modal-body label{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:600;color:var(--text)}
.modal-body input,.modal-body select,.modal-body textarea{padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px;outline:none;font-family:inherit}
.modal-body input:focus,.modal-body select:focus,.modal-body textarea:focus{border-color:var(--primary)}
.btn-block{width:100%;padding:12px;margin-top:4px}
.detail-img{width:100%;height:300px;object-fit:cover}
.detail-body{padding:24px}
.detail-body h2{font-size:24px;font-weight:800;margin-bottom:8px}
.detail-price{font-size:28px;font-weight:800;color:var(--primary);margin-bottom:16px}
.detail-row{display:flex;gap:12px;margin-bottom:12px;font-size:14px}
.detail-row span:first-child{color:var(--muted);min-width:90px}
.detail-desc{margin:16px 0;color:var(--text);line-height:1.7}
.detail-actions{display:flex;gap:12px;margin-top:20px}
.btn-outline{background:transparent;border:1px solid var(--border);padding:12px 24px;border-radius:10px;font-weight:600;cursor:pointer;font-size:14px;transition:all .2s}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
@media(max-width:768px){.header-inner{flex-wrap:wrap;height:auto;padding:12px 0}.search-bar{order:3;width:100%}.hero-text h1{font-size:28px}.hero-stats{gap:20px}.footer-inner{grid-template-columns:1fr 1fr}}