:root{
  --green:#16a34a; --green-d:#15803d; --dark:#0f2733; --grey:#4b5563;
  --light:#f1f5f9; --line:#e5e7eb; --orange:#ea7317; --red:#dc2626;
  --radius:14px; --shadow:0 2px 10px rgba(15,39,51,.06);
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:#f7fafc;color:var(--dark);line-height:1.5}
a{color:var(--green);text-decoration:none}
.container{max-width:960px;margin:0 auto;padding:18px 16px 40px}

/* top bar */
.topbar{background:var(--dark);color:#fff;display:flex;align-items:center;justify-content:space-between;
  padding:12px 16px;flex-wrap:wrap;gap:10px}
.brand{color:#fff;font-weight:700;font-size:1.15rem;display:flex;align-items:center;gap:6px}
.brand-mark{font-size:1.2rem}
.nav{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.nav a{color:#cbd5e1;font-size:.95rem}
.nav a:hover{color:#fff}
.nav .logout{color:#fca5a5}

/* alerts */
.alert{max-width:960px;margin:12px auto 0;padding:12px 16px;border-radius:10px;font-size:.95rem}
.alert.ok{background:#dcfce7;color:#166534;border:1px solid #86efac}
.alert.err{background:#fee2e2;color:#991b1b;border:1px solid #fca5a5}

/* cards */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:20px;margin-bottom:16px}
.card h2{margin:0 0 12px;font-size:1.15rem}
h1{font-size:1.6rem;margin:6px 0 16px}

/* balance tiles */
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:16px}
.tile{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.tile .label{color:var(--grey);font-size:.85rem;margin-bottom:4px}
.tile .value{font-size:1.5rem;font-weight:700}
.tile.green{background:var(--green);color:#fff;border:none}
.tile.green .label{color:#dcfce7}

/* offers */
.offer{display:flex;justify-content:space-between;align-items:center;gap:12px;
  padding:14px;border:1px solid var(--line);border-radius:12px;margin-bottom:10px;background:#fff}
.offer .info h3{margin:0 0 4px;font-size:1rem}
.offer .info p{margin:0;color:var(--grey);font-size:.88rem}
.offer .reward{font-weight:700;color:var(--green);white-space:nowrap}
.badge{display:inline-block;background:var(--light);color:var(--grey);
  padding:2px 8px;border-radius:999px;font-size:.75rem;margin-right:4px}

/* buttons */
.btn{display:inline-block;background:var(--green);color:#fff;border:none;
  padding:11px 18px;border-radius:10px;font-size:.95rem;font-weight:600;cursor:pointer;text-align:center}
.btn:hover{background:var(--green-d)}
.btn.block{display:block;width:100%}
.btn.orange{background:var(--orange)}
.btn.grey{background:#e2e8f0;color:var(--dark)}
.btn.red{background:var(--red)}
.btn.sm{padding:7px 12px;font-size:.85rem}

/* forms */
.field{margin-bottom:14px}
.field label{display:block;font-size:.9rem;margin-bottom:5px;color:var(--dark);font-weight:600}
.field input,.field select,.field textarea{width:100%;padding:11px 12px;border:1px solid var(--line);
  border-radius:10px;font-size:1rem;font-family:inherit}
.field input:focus,.field select:focus{outline:2px solid var(--green);border-color:var(--green)}
.hint{color:var(--grey);font-size:.82rem;margin-top:4px}

/* auth pages */
.auth-wrap{max-width:420px;margin:40px auto}
.auth-wrap .card{padding:26px}
.auth-wrap h1{text-align:center}
.center-link{text-align:center;margin-top:14px;font-size:.92rem}

/* tables */
table{width:100%;border-collapse:collapse;font-size:.9rem}
th,td{text-align:left;padding:10px;border-bottom:1px solid var(--line)}
th{color:var(--grey);font-weight:600}
.status{padding:2px 9px;border-radius:999px;font-size:.78rem;font-weight:600}
.status.pending{background:#fef9c3;color:#854d0e}
.status.paid,.status.approved{background:#dcfce7;color:#166534}
.status.rejected{background:#fee2e2;color:#991b1b}

/* referral box */
.ref-box{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.ref-box input{flex:1;min-width:200px;padding:11px;border:1px solid var(--line);border-radius:10px;font-size:.9rem}

/* hero (landing) */
.hero{text-align:center;padding:40px 16px}
.hero h1{font-size:2rem}
.hero p{color:var(--grey);max-width:560px;margin:0 auto 22px}
.hero .btn{margin:4px}

.foot{text-align:center;color:var(--grey);font-size:.85rem;padding:24px 16px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:640px){.grid2{grid-template-columns:1fr}}
.muted{color:var(--grey)}
.small{font-size:.85rem}