:root {
  --bg: #f3f5f9;
  --surface: #ffffff;
  --ink: #1f2a37;
  --muted: #64748b;
  --line: #d9e0ea;
  --brand: #0f766e;
  --brand-2: #0b5f58;
  --danger: #b91c1c;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: radial-gradient(circle at top right, #e8fff6, var(--bg) 45%);
  color: var(--ink);
  font-family: "Segoe UI", "Trebuchet MS", sans-serif;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
}

.topbar nav { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 1.2rem; color: var(--ink); }
.container { max-width: 980px; margin: 24px auto; padding: 0 14px; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 10px 24px rgba(31, 42, 55, 0.05);
}

.narrow { max-width: 520px; margin: 0 auto; }
.hero h1 { margin-top: 0; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.form { display: grid; gap: 10px; }
.inline-form { display: inline; }
.top-gap { margin-top: 12px; }
.muted { color: var(--muted); }

.flash {
  margin-bottom: 12px;
  border: 1px solid #b7f0d4;
  background: #effdf5;
  color: #176b40;
  padding: 10px 12px;
  border-radius: 10px;
}

input, textarea, select, button {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 11px;
  font: inherit;
}

textarea { width: 100%; }
input[type="text"], input[type="password"] { min-width: 220px; }

button, .btn {
  background: var(--brand);
  color: #fff;
  border: 1px solid var(--brand);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 12px;
  border-radius: 10px;
}

button:hover, .btn:hover { background: var(--brand-2); text-decoration: none; }
.btn.ghost { background: transparent; color: var(--brand); }
.danger { background: var(--danger); border-color: var(--danger); }

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

th, td {
  text-align: left;
  border-bottom: 1px solid var(--line);
  padding: 9px 8px;
}

.list { padding-left: 18px; }

@media (max-width: 720px) {
  .topbar { padding: 12px; }
  .container { margin: 16px auto; }
  table, thead, tbody, th, td, tr { display: block; }
  thead { display: none; }
  td { border-bottom: 0; padding: 6px 0; }
  tr { border-bottom: 1px solid var(--line); padding: 10px 0; }
}