/* Glassy dark theme — black, tan, blue, gray. Apple-style semi-transparent. */
:root {
  --bg-dark: #0a0a0c;
  --bg-card: rgba(18, 18, 22, 0.72);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-highlight: rgba(255, 255, 255, 0.06);
  --tan: #c4a77d;
  --tan-dim: #a08b62;
  --blue: #5b8def;
  --blue-hover: #7aa3f5;
  --gray-1: #1c1c1f;
  --gray-2: #2c2c30;
  --gray-3: #8e8e93;
  --gray-4: #aeaeb2;
  --text: #f5f5f7;
  --text-muted: #98989d;
  --error: #ff6b6b;
  --success: #51cf66;
  --radius: 14px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --backdrop-blur: 20px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(91, 141, 239, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(196, 167, 125, 0.08), transparent);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  backdrop-filter: blur(var(--backdrop-blur));
  -webkit-backdrop-filter: blur(var(--backdrop-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 36px;
}

.auth-logo {
  display: block;
  margin-bottom: 20px;
  text-align: center;
}

.auth-logo img {
  height: 36px;
  width: auto;
  max-width: 100px;
  max-height: 36px;
  object-fit: contain;
}

.auth-card h1 {
  margin: 0 0 8px;
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}

.auth-card .subtitle {
  margin: 0 0 28px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.auth-form label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--gray-4);
}

.auth-form input {
  width: 100%;
  padding: 14px 16px;
  margin-bottom: 4px;
  font-size: 1rem;
  color: var(--text);
  background: rgba(28, 28, 31, 0.8);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.auth-form input::placeholder {
  color: var(--gray-3);
}

.auth-form input:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

.auth-form input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(91, 141, 239, 0.25);
}

.auth-form input.invalid {
  border-color: var(--error);
}

.auth-form input.valid {
  border-color: rgba(81, 207, 102, 0.5);
}

.field-hint {
  font-size: 0.8rem;
  margin-bottom: 16px;
  min-height: 18px;
}

.field-hint.available {
  color: var(--success);
}

.field-hint.taken,
.field-hint.error {
  color: var(--error);
}

.btn-primary {
  width: 100%;
  padding: 14px 24px;
  margin-top: 8px;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(180deg, var(--blue) 0%, #4a7ad4 100%);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  box-shadow: 0 2px 12px rgba(91, 141, 239, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(180deg, var(--blue-hover) 0%, var(--blue) 100%);
}

.btn-primary:active {
  transform: scale(0.99);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.auth-footer {
  margin-top: 24px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.auth-footer a {
  color: var(--blue);
  text-decoration: none;
  font-weight: 500;
}

.auth-footer a:hover {
  text-decoration: underline;
}

.form-message {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 10px;
  font-size: 0.9rem;
  display: none;
}

.form-message.show {
  display: block;
}

.form-message.error {
  background: rgba(255, 107, 107, 0.15);
  border: 1px solid rgba(255, 107, 107, 0.3);
  color: #ff8a8a;
}

.form-message.success {
  background: rgba(81, 207, 102, 0.15);
  border: 1px solid rgba(81, 207, 102, 0.3);
  color: #6ee67a;
}

.login-link {
  display: inline-block;
  margin-top: 4px;
}