:root{
  --primary:#2563EB;
  --primary-dark:#1D4ED8;
  --bg:#F8FAFC;
  --card:#FFFFFF;
  --border:#E2E8F0;
  --text:#0F172A;
  --text-muted:#64748B;
  --success:#16A34A;
  --warning:#F59E0B;
  --danger:#DC2626;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 4px 24px rgba(15,23,42,.06);
  --shadow-hover:0 8px 32px rgba(15,23,42,.12);
}
[data-theme="dark"]{
  --bg:#0F172A;
  --card:#1E293B;
  --border:#334155;
  --text:#F1F5F9;
  --text-muted:#94A3B8;
  --shadow:0 4px 24px rgba(0,0,0,.3);
  --shadow-hover:0 8px 32px rgba(0,0,0,.5);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:0;background:none}
input,select,textarea{font-family:inherit}

/* Layout */
.app{display:flex;min-height:100vh}
.sidebar{width:280px;background:var(--card);border-right:1px solid var(--border);position:fixed;top:0;left:0;bottom:0;z-index:40;transform:translateX(0);transition:.3s;overflow-y:auto}
.sidebar.hidden{transform:translateX(-100%)}
.main{flex:1;margin-left:280px;min-height:100vh}
.topbar{position:sticky;top:0;z-index:20;background:var(--card);border-bottom:1px solid var(--border);padding:12px 24px;display:flex;align-items:center;justify-content:space-between;backdrop-filter:blur(12px)}
.hamburger{display:none;width:40px;height:40px;border-radius:10px;background:var(--bg);align-items:center;justify-content:center}
.brand{display:flex;align-items:center;gap:12px;padding:20px 20px 16px}
.brand-logo{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));display:grid;place-items:center;color:white;font-weight:800;font-size:18px}
.brand h1{font-size:16px;line-height:1.2}
.brand p{font-size:12px;color:var(--text-muted)}

.nav{padding:8px 12px}
.nav-section{font-size:11px;font-weight:600;letter-spacing:.08em;color:var(--text-muted);text-transform:uppercase;padding:16px 12px 6px}
.nav-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:12px;font-size:14px;font-weight:500;color:var(--text-muted);transition:.2s;width:100%;text-align:left}
.nav-item:hover{background:var(--bg);color:var(--text)}
.nav-item.active{background:var(--primary);color:white;box-shadow:0 4px 12px rgba(37,99,235,.3)}
.nav-item svg{width:20px;height:20px;flex-shrink:0}

.content{padding:24px;max-width:1200px;margin:0 auto}

/* Cards */
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;transition:.2s}
.card:hover{box-shadow:var(--shadow-hover)}
.card-title{font-size:16px;font-weight:600;margin-bottom:4px}
.card-desc{font-size:13px;color:var(--text-muted);margin-bottom:16px}
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.stat-card{display:flex;justify-content:space-between;align-items:center}
.stat-num{font-size:28px;font-weight:800}
.badge{display:inline-flex;align-items:center;padding:4px 10px;border-radius:999px;font-size:11px;font-weight:600}
.badge-primary{background:rgba(37,99,235,.1);color:var(--primary)}
.badge-success{background:rgba(22,163,74,.1);color:var(--success)}

/* Forms */
.form-group{margin-bottom:16px}
.label{font-size:13px;font-weight:600;margin-bottom:6px;display:block}
.input-wrap{position:relative}
.input{width:100%;padding:12px 14px;border-radius:12px;border:1px solid var(--border);background:var(--card);color:var(--text);font-size:14px;transition:.2s;outline:none}
.input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
.input:disabled{opacity:.6}
.autocomplete-list{position:absolute;top:calc(100% + 6px);left:0;right:0;background:var(--card);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow-hover);max-height:260px;overflow-y:auto;z-index:30;display:none}
.autocomplete-list.show{display:block}
.ac-item{padding:10px 14px;cursor:pointer;font-size:13px;display:flex;flex-direction:column}
.ac-item:hover,.ac-item.active{background:var(--bg)}
.ac-item small{color:var(--text-muted);font-size:11px}

.btn{padding:12px 20px;border-radius:12px;font-weight:600;font-size:14px;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:.2s;line-height:1}
.btn-primary{background:var(--primary);color:white;box-shadow:0 4px 14px rgba(37,99,235,.3)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px)}
.btn-ghost{background:var(--bg);color:var(--text);border:1px solid var(--border)}
.btn-ghost:hover{background:var(--card)}
.btn-sm{padding:8px 12px;font-size:12px;border-radius:8px}
.btn-icon{width:40px;height:40px;padding:0;border-radius:10px}

.row{display:flex;gap:12px;flex-wrap:wrap}
.chip{padding:6px 12px;border-radius:999px;background:var(--bg);border:1px solid var(--border);font-size:12px;font-weight:500;cursor:pointer;transition:.15s}
.chip.active{background:var(--primary);color:white;border-color:var(--primary)}
.chip:hover{border-color:var(--primary)}

.result-card{padding:16px;border-radius:14px;border:1px solid var(--border);background:var(--card);display:flex;justify-content:space-between;gap:12px;align-items:flex-start}
.result-card .price{font-weight:800;font-size:18px;color:var(--primary)}
.result-card .meta{font-size:12px;color:var(--text-muted)}

.skeleton{background:linear-gradient(90deg,var(--border) 25%,var(--bg) 50%,var(--border) 75%);background-size:200% 100%;animation:shim 1.2s infinite;border-radius:10px}
@keyframes shim{0%{background-position:200% 0}100%{background-position:-200% 0}}

.empty{text-align:center;padding:40px 20px;color:var(--text-muted)}
.empty-icon{width:64px;height:64px;margin:0 auto 16px;border-radius:20px;background:var(--bg);display:grid;place-items:center;font-size:28px}

/* FAB */
.fab{position:fixed;right:20px;bottom:20px;z-index:30;background:var(--primary);color:white;width:56px;height:56px;border-radius:18px;display:grid;place-items:center;box-shadow:0 8px 24px rgba(37,99,235,.4);transition:.2s}
.fab:hover{transform:translateY(-2px) scale(1.05)}

/* Tracking timeline */
.timeline{position:relative;padding-left:28px}
.timeline:before{content:'';position:absolute;left:8px;top:8px;bottom:8px;width:2px;background:var(--border)}
.t-item{position:relative;padding-bottom:20px}
.t-dot{position:absolute;left:-24px;top:4px;width:12px;height:12px;border-radius:50%;background:var(--card);border:2px solid var(--border)}
.t-item.done .t-dot{background:var(--success);border-color:var(--success)}
.t-item.active .t-dot{background:var(--primary);border-color:var(--primary);box-shadow:0 0 0 4px rgba(37,99,235,.15)}

/* Dark toggle */
.switch{width:44px;height:26px;background:var(--border);border-radius:999px;position:relative;transition:.2s;cursor:pointer}
.switch:after{content:'';position:absolute;top:3px;left:3px;width:20px;height:20px;background:white;border-radius:50%;transition:.2s;box-shadow:0 1px 3px rgba(0,0,0,.2)}
.switch.on{background:var(--primary)}
.switch.on:after{transform:translateX(18px)}

/* Responsive */
@media(max-width:1024px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.show{transform:translateX(0)}
  .main{margin-left:0}
  .hamburger{display:flex}
  .grid-4{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:640px){
  .content{padding:16px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .topbar{padding:10px 16px}
}
.hidden-view{display:none!important}
.toast{position:fixed;bottom:90px;left:50%;transform:translateX(-50%);background:var(--text);color:var(--card);padding:10px 16px;border-radius:999px;font-size:13px;z-index:100;box-shadow:var(--shadow-hover);opacity:0;pointer-events:none;transition:.25s}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}