:root{
  --black:#000000;
  --primary:#18A7B0;
  --primary-soft:#1ECAD3;
  --bg:#F4F6F8;
  --card:#FFFFFF;
  --text:#111111;
  --muted:#555555;
  --border:#E5E7EB;
  --radius:8px;
  --shadow:0 4px 12px rgba(0,0,0,.08);
  --font: 'Segoe UI', system-ui, -apple-system, Arial, sans-serif;
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
}

/* ===== HEADER ===== */
.topbar{
  background:var(--black);
  color:#fff;
  padding:14px 24px;
  font-size:18px;
  font-weight:600;
}

/* ===== LAYOUT ===== */
.container{
  max-width:420px;
  margin:80px auto;
  padding:0 16px;
}

/* ===== CARD ===== */
.card{
  background:var(--card);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  border-left:6px solid var(--primary);
}

.card-body{
  padding:24px;
}

h1{
  font-size:20px;
  margin:0 0 8px;
}

.subtitle{
  color:var(--muted);
  font-size:14px;
  margin-bottom:20px;
}

/* ===== FORM ===== */
label{
  display:block;
  font-size:13px;
  margin-bottom:4px;
  color:var(--muted);
}

input{
  width:100%;
  padding:10px 12px;
  border-radius:6px;
  border:1px solid var(--border);
  margin-bottom:14px;
  font-size:14px;
}

input:focus{
  outline:none;
  border-color:var(--primary);
}

/* ===== BUTTONS ===== */
.btn-primary{
  background:var(--primary);
  color:#fff;
  border:none;
  padding:10px 16px;
  border-radius:6px;
  font-size:14px;
  cursor:pointer;
}

.btn-primary:hover{
  background:var(--primary-soft);
}

.btn-secondary{
  background:#6C757D;
  color:#fff;
  border:none;
  padding:10px 16px;
  border-radius:6px;
  font-size:14px;
}

/* ===== ALERT ===== */
.alert{
  background:#FEE2E2;
  color:#991B1B;
  padding:10px 12px;
  border-radius:6px;
  margin-bottom:14px;
  font-size:14px;
}