/* =========================================================
   login.css — Diseño moderno dark theme
   ========================================================= */

:root {
  --brand:       #0d6efd;
  --brand-dark:  #0a58ca;
  --brand-soft:  rgba(13,110,253,.15);
  --text:        #e8ecff;
  --muted:       #aab0c5;
  --body-bg:     #181c25;
  --card-bg:     #1f2430;
  --card-bg2:    #252b38;
  --border:      #2a3040;
  --danger:      #dc3545;
  --danger-soft: rgba(220,53,69,.12);
}

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

html, body {
  height: 100%;
  font-family: 'Segoe UI', system-ui, Roboto, Arial, sans-serif;
}

body {
  background: var(--body-bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  overflow: hidden;
  position: relative;
}

/* ===== FONDO ANIMADO ===== */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(13,110,253,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(13,110,253,.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  animation: floatGlow 8s ease-in-out infinite alternate;
}

.bg-glow-1 {
  width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(13,110,253,.18) 0%, transparent 70%);
  top: -80px; left: -80px;
}

.bg-glow-2 {
  width: 360px; height: 360px;
  background: radial-gradient(circle, rgba(102,16,242,.14) 0%, transparent 70%);
  bottom: -60px; right: -60px;
  animation-delay: -4s;
}

@keyframes floatGlow {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(30px, 20px) scale(1.08); }
}

/* ===== WRAPPER ===== */
.login-wrapper {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  padding: 16px;
}

/* ===== CARD ===== */
.login-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px 32px 28px;
  box-shadow:
    0 0 0 1px rgba(255,255,255,.04),
    0 20px 60px rgba(0,0,0,.5),
    0 0 80px rgba(13,110,253,.06);
  animation: slideUp .45s cubic-bezier(.22,1,.36,1);
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(28px) scale(.97); }
  to   { opacity: 1; transform: none; }
}

/* ===== BRAND ===== */
.login-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}

.brand-icon {
  width: 44px; height: 44px;
  background: linear-gradient(135deg, var(--brand) 0%, #6610f2 100%);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  color: #fff;
  box-shadow: 0 4px 14px rgba(13,110,253,.35);
  flex-shrink: 0;
}

.brand-name {
  font-size: 14px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: .2px;
}

.brand-sub {
  font-size: 11px;
  color: var(--muted);
  margin-top: 2px;
}

/* ===== TÍTULOS ===== */
.login-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 6px;
  letter-spacing: -.2px;
}

.login-desc {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 24px;
}

/* ===== ALERTA ERROR ===== */
.alert-error {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--danger-soft);
  border: 1px solid rgba(220,53,69,.3);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 13px;
  color: #ff8080;
  margin-bottom: 18px;
  animation: shakeIn .35s ease;
}

.alert-error i { font-size: 15px; flex-shrink: 0; }

@keyframes shakeIn {
  0%  { transform: translateX(-6px); opacity: 0; }
  40% { transform: translateX(4px); }
  70% { transform: translateX(-3px); }
  100%{ transform: translateX(0);   opacity: 1; }
}

/* ===== CAMPOS ===== */
.field-group {
  margin-bottom: 18px;
}

.field-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .4px;
  margin-bottom: 7px;
}

.field-wrap {
  position: relative;
}

.field-icon {
  position: absolute;
  left: 13px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 15px;
  pointer-events: none;
  transition: color .2s;
}

.field-input {
  width: 100%;
  background: var(--card-bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 14px;
  padding: 11px 44px 11px 40px;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
  font-family: inherit;
}

.field-input::placeholder { color: #5a6278; }

.field-input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(13,110,253,.15);
}

.field-input:focus + .field-icon,
.field-wrap:focus-within .field-icon {
  color: var(--brand);
}

/* input inválido */
.field-group.has-error .field-input {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(220,53,69,.12);
}

.field-error {
  display: block;
  font-size: 11px;
  color: #ff8080;
  margin-top: 5px;
  min-height: 14px;
}

/* toggle contraseña */
.toggle-pwd {
  position: absolute;
  right: 11px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 16px;
  padding: 2px 4px;
  display: flex; align-items: center;
  transition: color .2s;
}
.toggle-pwd:hover { color: var(--brand); }

/* ===== BOTÓN LOGIN ===== */
.btn-login {
  width: 100%;
  background: linear-gradient(135deg, var(--brand) 0%, #6610f2 100%);
  border: none;
  border-radius: 10px;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  padding: 13px;
  cursor: pointer;
  margin-top: 8px;
  display: flex; align-items: center; justify-content: center;
  gap: 8px;
  transition: filter .2s, transform .15s;
  box-shadow: 0 4px 18px rgba(13,110,253,.3);
  font-family: inherit;
  letter-spacing: .2px;
}

.btn-login:hover  { filter: brightness(1.1); }
.btn-login:active { transform: scale(.98); }

.btn-login:disabled {
  opacity: .55;
  cursor: not-allowed;
  transform: none;
  filter: none;
}

/* spinner loading */
.spinner {
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: inline-block;
}

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

/* ===== FOOTER ===== */
.login-footer {
  margin-top: 22px;
  text-align: center;
  font-size: 11px;
  color: #4a5268;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  .login-card { padding: 28px 20px 22px; border-radius: 16px; }
  .login-title { font-size: 20px; }
}