:root {
  --ink: #0b1f33;
  --muted: #3a5168;
  --line: rgba(11, 31, 51, 0.12);
  --accent: #0f766e;
  --accent-deep: #115e59;
  --surface: #ffffff;
  --font: "Outfit", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(900px 500px at 10% -10%, rgba(20, 184, 166, 0.18), transparent 55%),
    linear-gradient(180deg, #f3f7fb, #e8eef4);
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

.auth-card {
  width: min(420px, 100%);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.75rem 1.5rem 1.5rem;
  box-shadow: 0 18px 50px rgba(11, 31, 51, 0.12);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--ink);
  text-decoration: none;
  margin-bottom: 1.25rem;
}

.brand-mark {
  width: 1.45rem;
  height: 1.45rem;
  border-radius: 6px;
  background: linear-gradient(135deg, #14b8a6, var(--accent-deep));
}

h1 {
  margin: 0 0 0.35rem;
  font-size: 1.45rem;
  letter-spacing: -0.02em;
}

.lede {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.btn:hover { background: #f5f8fb; }

.btn-primary {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.btn-primary:hover { background: #16324c; }

.btn-facebook {
  background: #1877f2;
  border-color: #1877f2;
  color: #fff;
}

.btn-facebook:hover { background: #166fe5; }

.divider {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.75rem;
  align-items: center;
  margin: 0.85rem 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.divider::before,
.divider::after {
  content: "";
  height: 1px;
  background: var(--line);
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

input {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  margin-bottom: 0.65rem;
}

.msg {
  margin: 0.75rem 0 0;
  font-size: 0.9rem;
  color: #b42318;
  min-height: 1.2em;
}

.msg.ok { color: var(--accent-deep); }

.switch {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--muted);
}

.switch button {
  border: none;
  background: none;
  color: var(--accent-deep);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.back {
  display: block;
  margin-top: 1rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}