:root{--bg:#fafaf9;--white:#fff;--dark:#1c1917;--text:#44403c;--muted:#a8a29e;--border:#e7e5e4;--amber:#f59e0b;--amber-light:#fef3c7;--amber-dark:#b45309;--green:#10b981;--blue:#3b82f6;--rose:#f43f5e;--max:1200px;--radius:14px;--shadow:0 1px 3px rgba(0,0,0,.08)}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:Inter,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
a{color:var(--amber-dark);text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(var(--max),calc(100% - 32px));margin:0 auto}

/* Header */
.site-header{background:var(--white);border-bottom:1px solid var(--border);padding:14px 0;position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.nav-wrap{display:flex;justify-content:space-between;align-items:center}
.brand{font-weight:900;font-size:1.3rem;color:var(--dark);letter-spacing:-.03em}
.brand span{color:var(--amber)}
.nav-links{display:flex;gap:20px;align-items:center;font-size:.92rem;font-weight:500}
.nav-links a{color:var(--text);transition:.2s}
.nav-links a:hover,.nav-links a.active{color:var(--amber-dark)}
.btn-nav{background:var(--amber);color:#fff!important;padding:8px 16px;border-radius:8px;font-weight:700;font-size:.88rem}
.btn-nav:hover{background:var(--amber-dark)}
.hamburger{display:none;background:none;border:0;cursor:pointer;color:var(--dark)}

/* Hero */
.hero{padding:80px 0 60px;text-align:center;background:linear-gradient(180deg,#fffbeb 0,var(--bg) 100%)}
.hero-badge{display:inline-block;background:var(--amber-light);color:var(--amber-dark);font-size:.75rem;font-weight:800;text-transform:uppercase;letter-spacing:.1em;padding:6px 14px;border-radius:999px;margin-bottom:18px}
.hero h1{font-size:clamp(2rem,5vw,3.8rem);line-height:1.06;letter-spacing:-.05em;color:var(--dark);margin-bottom:14px}
.hero h1 em{font-style:normal;color:var(--amber)}
.hero p{max-width:56ch;margin:0 auto 28px;color:var(--muted);font-size:1.08rem}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:6px;padding:13px 24px;border-radius:10px;font-weight:700;font-size:.95rem;border:1px solid transparent;cursor:pointer;transition:.2s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--amber);color:#fff;border-color:var(--amber)}
.btn-primary:hover{background:var(--amber-dark)}
.btn-secondary{background:var(--white);color:var(--dark);border-color:var(--border)}
.btn-sm{padding:8px 14px;font-size:.85rem}
.btn-full{width:100%;justify-content:center}

/* Section */
section{padding:56px 0}
.section-header{text-align:center;margin-bottom:32px}
.section-header h2{font-size:clamp(1.5rem,4vw,2.4rem);letter-spacing:-.04em;color:var(--dark);margin-bottom:6px}
.section-header p{color:var(--muted)}

/* Cards */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:.2s}
.card:hover{box-shadow:0 4px 16px rgba(0,0,0,.08);transform:translateY(-2px)}
.card-img{aspect-ratio:4/3;overflow:hidden;background:#f5f5f4}
.card-img img{width:100%;height:100%;object-fit:cover}
.card-body{padding:16px}
.card-body h3{font-size:1rem;color:var(--dark);margin-bottom:4px;letter-spacing:-.02em}
.card-meta{font-size:.82rem;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap;margin-bottom:6px}
.card-price{font-weight:800;color:var(--amber-dark);font-size:1.1rem}
.card-tag{display:inline-block;font-size:.7rem;font-weight:700;text-transform:uppercase;padding:3px 8px;border-radius:6px}
.tag-swap{background:#ecfdf5;color:#059669}
.tag-sell{background:#eff6ff;color:#2563eb}
.tag-both{background:#fef3c7;color:#b45309}

/* Feature blocks */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature{text-align:center;padding:28px 20px}
.feature-icon{font-size:2.4rem;margin-bottom:12px}
.feature h3{font-size:1.05rem;color:var(--dark);margin-bottom:6px}
.feature p{color:var(--muted);font-size:.9rem}

/* How it works */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:step}
.step{text-align:center;padding:24px 16px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius);position:relative}
.step:before{counter-increment:step;content:counter(step);width:36px;height:36px;border-radius:50%;background:var(--amber);color:#fff;display:grid;place-items:center;font-weight:900;margin:0 auto 12px}
.step h3{font-size:.95rem;color:var(--dark);margin-bottom:4px}
.step p{font-size:.85rem;color:var(--muted)}

/* Forms */
.form-group{margin-bottom:16px}
.form-group label{display:block;font-weight:600;font-size:.9rem;margin-bottom:4px;color:var(--dark)}
input[type="text"],input[type="email"],input[type="number"],input[type="file"],textarea,select{width:100%;background:var(--white);border:1px solid var(--border);color:var(--dark);padding:11px 14px;border-radius:10px;font:inherit;font-size:.95rem;transition:.2s}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--amber)}
textarea{min-height:100px;resize:vertical}
.form-hint{font-size:.8rem;color:var(--muted);margin-top:2px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}

/* Messages */
.flash{padding:14px 18px;border-radius:10px;margin-bottom:18px;font-weight:600;font-size:.92rem}
.flash-success{background:#ecfdf5;color:#059669;border:1px solid #a7f3d0}
.flash-error{background:#fef2f2;color:#dc2626;border:1px solid #fecaca}

/* Upload */
.photo-upload{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.photo-slot{aspect-ratio:1;border:2px dashed var(--border);border-radius:10px;display:grid;place-items:center;cursor:pointer;color:var(--muted);font-size:.8rem;text-align:center;position:relative;overflow:hidden;transition:.2s}
.photo-slot:hover{border-color:var(--amber);color:var(--amber-dark)}
.photo-slot img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.photo-slot input{position:absolute;inset:0;opacity:0;cursor:pointer}

/* Appraisal */
.appraisal-result{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:28px;text-align:center;margin-top:24px}
.appraisal-value{font-size:2.2rem;font-weight:900;color:var(--amber-dark);margin:12px 0}

/* Dashboard */
.dash-tabs{display:flex;gap:4px;margin-bottom:24px;border-bottom:2px solid var(--border)}
.dash-tab{padding:10px 18px;font-weight:600;font-size:.92rem;color:var(--muted);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-2px;transition:.2s}
.dash-tab.active{color:var(--amber-dark);border-color:var(--amber)}

/* Messages */
.msg-thread{max-height:400px;overflow-y:auto;padding:14px;border:1px solid var(--border);border-radius:var(--radius);margin-bottom:14px}
.msg{margin-bottom:12px;padding:10px 14px;border-radius:10px;max-width:80%}
.msg-mine{background:var(--amber-light);margin-left:auto}
.msg-other{background:#f5f5f4}
.msg-meta{font-size:.75rem;color:var(--muted);margin-top:4px}

/* Footer */
.site-footer{background:var(--dark);color:#d6d3d1;padding:48px 0 24px;margin-top:56px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;margin-bottom:32px}
.site-footer h4{color:var(--white);margin-bottom:12px}
.site-footer a{display:block;color:#a8a29e;padding:3px 0;font-size:.92rem}
.site-footer a:hover{color:var(--amber)}
.footer-bottom{border-top:1px solid #292524;padding-top:18px;font-size:.85rem;color:#78716c}

/* Responsive */
@media(max-width:768px){
  .hamburger{display:block}
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;background:var(--white);flex-direction:column;padding:18px;border-bottom:1px solid var(--border);box-shadow:var(--shadow)}
  .nav-links.open{display:flex}
  .grid-2,.grid-3,.grid-4,.features,.steps{grid-template-columns:1fr}
  .hero{padding:48px 0 36px}
  .form-row{grid-template-columns:1fr}
  .photo-upload{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr}
}