:root {
  --ink-950: #14131a;
  --ink-900: #1a1922;
  --ink-800: #22212c;
  --ink-700: #2c2a36;
  --ink-500: #4a4858;
  --ink-400: #6b6878;
  --ink-300: #9b98a8;
  --ink-200: #d4d2de;
  --ink-100: #eeecf4;
  --accent: #7b72e9;
  --accent-hover: #9189ee;
  --error: #f07178;
  --ok: #89d185;
  --radius: 10px;
  --radius-lg: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  background:
    radial-gradient(ellipse 70% 55% at 50% -10%, color-mix(in srgb, var(--accent) 14%, transparent), transparent),
    var(--ink-950);
  color: var(--ink-200);
  -webkit-font-smoothing: antialiased;
}

.auth-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 20px;
}

.brand {
  display: none;
}

.card {
  width: min(420px, 100%);
  background: color-mix(in srgb, var(--ink-800) 92%, transparent);
  border: 1px solid color-mix(in srgb, var(--ink-500) 70%, transparent);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
}

.card h1 {
  margin: 0 0 8px;
  color: var(--ink-100);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-align: center;
}

.card-sub {
  margin: 0 0 22px;
  text-align: center;
  font-size: 0.875rem;
  color: var(--ink-400);
  line-height: 1.45;
}

.stack { display: grid; gap: 14px; }

label {
  display: grid;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-300);
}

input {
  border: 1px solid var(--ink-500);
  background: var(--ink-900);
  color: var(--ink-100);
  border-radius: var(--radius);
  padding: 11px 13px;
  font: inherit;
  font-size: 0.95rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input::placeholder { color: var(--ink-400); }
input:hover { border-color: var(--ink-400); }
input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}

button, .btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  border: none;
  border-radius: var(--radius);
  padding: 11px 16px;
  background: var(--accent);
  color: var(--ink-950);
  text-decoration: none;
  cursor: pointer;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  transition: background 0.15s, transform 0.1s;
}

button:hover, .btn:hover { background: var(--accent-hover); }
button:active { transform: scale(0.98); }

.btn.secondary {
  background: transparent;
  border: 1px solid var(--ink-500);
  color: var(--ink-100);
}
.btn.secondary:hover {
  background: var(--ink-700);
  border-color: var(--ink-400);
}

.btn.ghost {
  background: transparent;
  color: var(--ink-200);
  border: 1px solid var(--ink-500);
  width: 100%;
}
.btn.ghost:hover {
  border-color: var(--accent);
  color: var(--ink-100);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.links {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  font-size: 0.875rem;
}
.links a { color: var(--accent); text-decoration: none; }
.links a:hover { text-decoration: underline; }

.error {
  margin: 0 0 12px;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--error) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--error) 35%, transparent);
  color: #ffb4b4;
  font-size: 0.875rem;
}

.message {
  margin: 0 0 12px;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--ok) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--ok) 30%, transparent);
  color: #b8e6b4;
  font-size: 0.875rem;
}

.divider {
  margin: 22px 0 14px;
  text-align: center;
  color: var(--ink-400);
  font-size: 0.8rem;
  position: relative;
}
.divider::before, .divider::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 38%;
  height: 1px;
  background: var(--ink-500);
}
.divider::before { left: 0; }
.divider::after { right: 0; }

.social { display: flex; gap: 10px; }
.social .btn { flex: 1; }

.passkey { margin-top: 16px; }
.passkey-hint {
  margin: 8px 0 0;
  text-align: center;
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--ink-400);
}

.auth-foot {
  margin-top: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--ink-400);
}
.auth-foot a { color: var(--ink-300); text-decoration: none; }
.auth-foot a:hover { color: var(--ink-100); }

@media (max-width: 480px) {
  .auth-shell { justify-content: flex-start; padding-top: 48px; }
}