/* Reset e base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg: #f5f5f0;
  --color-surface: #ffffff;
  --color-primary: #1a56db;
  --color-primary-hover: #1246c6;
  --color-text: #111827;
  --color-muted: #6b7280;
  --color-error-bg: #fef2f2;
  --color-error-border: #fca5a5;
  --color-error-text: #991b1b;
  --color-border: #e5e7eb;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.container {
  width: 100%;
  max-width: 400px;
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2.5rem 2rem;
}

.logo {
  text-align: center;
  margin-bottom: 2rem;
}

.logo-icon {
  font-size: 2.5rem;
  display: block;
  margin-bottom: .5rem;
}

.logo h1 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
}

.subtitle {
  font-size: .875rem;
  color: var(--color-muted);
  margin-top: .25rem;
}

.alert {
  padding: .75rem 1rem;
  border-radius: var(--radius);
  font-size: .875rem;
  margin-bottom: 1.25rem;
}

.alert-error {
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  color: var(--color-error-text);
}

.form-group {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  font-size: .875rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: .375rem;
}

input[type="password"] {
  width: 100%;
  padding: .625rem .875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color .15s, box-shadow .15s;
  outline: none;
}

input[type="password"]:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26,86,219,.15);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .625rem 1.25rem;
  border-radius: var(--radius);
  font-size: .9375rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background .15s, transform .1s;
  text-decoration: none;
}

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

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

.btn-primary:active {
  transform: scale(.98);
}

.btn-block {
  width: 100%;
}