:root {
  --bg: #f3f7fb;
  --panel: #ffffff;
  --ink: #1e293b;
  --muted: #5b6b7f;
  --brand: #0a2540;
  --error: #b91c1c;
  --border: #dbe6f2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f8fbff, var(--bg));
}

.admin-login {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: min(460px, 100%);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 18px 40px rgba(10, 37, 64, 0.12);
  padding: 28px;
}

.login-card h1 {
  margin: 0 0 10px;
}

.login-hint {
  color: var(--muted);
  margin-bottom: 18px;
}

.input,
button {
  font: inherit;
}

.input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #c9d6e3;
  border-radius: 10px;
  background: #fff;
}

.form-row {
  display: grid;
  gap: 10px;
  margin-bottom: 12px;
}

.btn {
  border: 0;
  border-radius: 10px;
  padding: 11px 16px;
  cursor: pointer;
  background: var(--brand);
  color: #fff;
  transition: 0.25s ease;
}

.btn:hover {
  background: #12385f;
  transform: translateY(-1px);
}

.error {
  color: var(--error);
  font-size: 0.92rem;
  min-height: 20px;
}