/* ============================================================
   LOGIN - GestorSIM
   Estilo moderno con gradiente y tarjeta flotante.
   ============================================================ */

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

:root {
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-primary-light: #60a5fa;
  --color-bg-dark: #0f172a;
  --color-bg-medium: #1e293b;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-error: #ef4444;
  --color-error-bg: #fef2f2;
  --color-white: #ffffff;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.3);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, sans-serif;
  min-height: 100vh;
  background: linear-gradient(135deg, #1e3a8a 0%, #0f172a 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  color: var(--color-text);
}

.login-container {
  width: 100%;
  max-width: 420px;
  animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.login-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  box-shadow: var(--shadow-lg);
}

/* Header */
.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.logo {
  font-size: 56px;
  margin-bottom: 8px;
  display: block;
}

.login-header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-bg-dark);
  margin-bottom: 4px;
  letter-spacing: -0.5px;
}

.subtitle {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 2px;
}

.brand {
  font-size: 12px;
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Form */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 12px 14px;
  font-size: 15px;
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-md);
  transition: all 0.2s;
  background: #f8fafc;
  font-family: inherit;
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-white);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

/* Password wrapper */
.password-wrapper {
  position: relative;
}

.toggle-password {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  font-size: 18px;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  transition: background 0.15s;
  opacity: 0.6;
}

.toggle-password:hover {
  background: #e2e8f0;
  opacity: 1;
}

/* Error */
.error-message {
  background: var(--color-error-bg);
  color: var(--color-error);
  padding: 12px 14px;
  border-radius: var(--radius-md);
  font-size: 13px;
  margin-bottom: 16px;
  border-left: 4px solid var(--color-error);
  animation: shake 0.4s;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

.hidden {
  display: none !important;
}

/* Botón */
.btn-login {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  position: relative;
  font-family: inherit;
}

.btn-login:hover:not(:disabled) {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 8px 16px rgba(59, 130, 246, 0.3);
}

.btn-login:active:not(:disabled) {
  transform: translateY(0);
}

.btn-login:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* Spinner */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: var(--color-white);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Footer */
.login-footer {
  text-align: center;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid #e2e8f0;
}

.login-footer p {
  font-size: 11px;
  color: var(--color-text-light);
}

/* Responsive */
@media (max-width: 480px) {
  .login-card {
    padding: 28px 24px;
  }
  .login-header h1 {
    font-size: 24px;
  }
  .logo {
    font-size: 48px;
  }
}