:root {
  --bg: #0f0f12;
  --panel: #17171b;
  --border: #2a2a31;
  --text: #ebebec;
  --muted: #8b8b92;
  --accent: #5ba3d0;
  --accent-hover: #7bb8df;
  --error: #d06060;
  --input-bg: #1d1d22;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
}

.shell {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 2rem;
  background:
    radial-gradient(ellipse at top, rgba(91, 163, 208, 0.08), transparent 60%),
    var(--bg);
}

.card {
  width: 100%;
  max-width: 380px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2.25rem 2rem 1.75rem;
  box-shadow: 0 8px 40px rgba(0,0,0,0.4);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.75rem;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand-mark {
  color: var(--accent);
  font-size: 1rem;
}

h1 {
  margin: 0 0 1.5rem;
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

label {
  display: block;
  margin-bottom: 1rem;
}

label span {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
  letter-spacing: 0.02em;
}

input {
  width: 100%;
  padding: 0.7rem 0.85rem;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
  transition: border-color 0.15s;
}

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

button {
  width: 100%;
  padding: 0.75rem;
  margin-top: 0.5rem;
  background: var(--accent);
  color: #0b1018;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

button:hover {
  background: var(--accent-hover);
}

.error {
  padding: 0.6rem 0.8rem;
  background: rgba(208, 96, 96, 0.1);
  border: 1px solid rgba(208, 96, 96, 0.3);
  color: var(--error);
  border-radius: 6px;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.small {
  text-align: center;
  color: var(--muted);
  font-size: 0.75rem;
  margin-top: 1.5rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}