:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-hover: #21263a;
  --border: #2a2f45;
  --accent: #6c63ff;
  --accent-hover: #857dff;
  --text: #e8eaf0;
  --muted: #7b82a0;
  --danger: #e05555;
  --danger-hover: #f06060;
  --success: #40c07a;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1rem 4rem;
}

.site-header {
  width: 100%;
  max-width: 680px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2.5rem;
}

.site-logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.03em;
}

.site-logo span { color: var(--text); }

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.15s;
}

.site-nav a:hover { color: var(--text); }

.container {
  width: 100%;
  max-width: 680px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

h1 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--muted);
  font-size: 0.925rem;
  margin-bottom: 1.75rem;
}

label {
  display: block;
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  font-size: 1rem;
  padding: 0.65rem 0.9rem;
  outline: none;
  transition: border-color 0.15s;
}

.input:focus { border-color: var(--accent); }
.input.error { border-color: var(--danger); }

.field-hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

.field-error {
  font-size: 0.8rem;
  color: var(--danger);
  margin-top: 0.4rem;
  display: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.4rem;
  border-radius: 7px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background 0.15s, transform 0.1s;
  text-decoration: none;
}

.btn:active { transform: scale(0.97); }

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

.btn-primary:hover { background: var(--accent-hover); }

.btn-primary:disabled {
  background: var(--border);
  color: var(--muted);
  cursor: not-allowed;
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--border);
  padding: 0.3rem 0.7rem;
  font-size: 0.8rem;
}

.btn-danger:hover {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}

.btn-ghost:hover { color: var(--text); border-color: var(--muted); }

.alert {
  border-radius: 7px;
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
}

.alert-error {
  background: rgba(224,85,85,0.12);
  border: 1px solid rgba(224,85,85,0.35);
  color: #f08080;
}

.progress-bar-track {
  height: 6px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
  margin-top: 0.6rem;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 99px;
  transition: width 0.2s;
  width: 0%;
}

.progress-bar-fill.full { background: var(--danger); }

.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-accent {
  background: rgba(108,99,255,0.18);
  color: var(--accent-hover);
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}