:root {
  --dark: #141E30;
  --mid: #35577D;
  --white: #ffffff;
  --soft: rgba(255,255,255,0.7);
  
  /* === SOMBRAS MODO OSCURO === */
  --sombra: 0 1px 3px rgba(0,0,0,.4), 0 1px 2px rgba(0,0,0,.3);
  --sombra-md: 0 4px 12px rgba(0,0,0,.5);
  --sombra-lg: 0 20px 40px rgba(0,0,0,.6);

  /* === MODO OSCURO (default) === */
  --bg-app: #0F1117;
  --bg-card: #1A1E2E;
  --bg-card2: #222840;
  --txt-pri: #E2E8F0;
  --txt-sec: #94A3B8;
  --txt-ter: #475569;
  --borde: #2D3748;
  --borde2: #374151;
  --sidebar-bg: #0B0E1A;
  --sidebar-txt: #64748B;
  --navbar-bg: #13172A;
}

/* RESET */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", "Roboto", sans-serif;
}

/* BODY - SIN SCROLL */
body {
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: relative;
  background:
    linear-gradient(rgba(15,17,23,0.88), rgba(26,30,46,0.94)),
    url('https://images.unsplash.com/photo-1566073771259-6a8506099945') center/cover no-repeat fixed;
}

/* CENTRADO - OCUPA 100% SIN SCROLL */
.login-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  overflow: auto;
}

/* CARD */
.login-card {
  width: 100%;
  max-width: 400px;
  padding: 35px;
  border-radius: 20px;
  background: var(--bg-card);
  box-shadow: var(--sombra-lg);
  border: 1px solid var(--borde);
  transition: all 0.3s ease;
  backdrop-filter: blur(2px);
  margin: auto;
}

.login-card:hover {
  border-color: var(--borde2);
  box-shadow: 0 25px 45px rgba(0,0,0,0.7);
}

/* HEADER */
.login-header {
  text-align: center;
  margin-bottom: 28px;
}

.icon {
  font-size: 3rem;
  margin-bottom: 12px;
  color: var(--mid);
  opacity: 0.95;
}

.login-header h2 {
  margin-bottom: 8px;
  color: var(--txt-pri);
  font-size: 1.8rem;
}

.login-header p {
  font-size: 0.85rem;
  color: var(--txt-sec);
}

/* FORM */
.field {
  margin-bottom: 22px;
}

.field label {
  font-size: 0.85rem;
  margin-bottom: 8px;
  display: block;
  color: var(--txt-sec);
  font-weight: 500;
}

/* INPUT - CONTENEDOR PRINCIPAL */
.input {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
}

/* ICONO DEL USUARIO/LOCK */
.input > i:first-child {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--txt-ter);
  z-index: 2;
  pointer-events: none;
  font-size: 1rem;
  line-height: 1;
}

/* CAMPO INPUT */
.input input {
  width: 100%;
  padding: 12px 50px 12px 42px;
  border-radius: 10px;
  border: 1.5px solid var(--borde);
  outline: none;
  background: var(--bg-card2);
  color: var(--txt-pri);
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.input input:focus {
  border-color: var(--mid);
  box-shadow: 0 0 0 3px rgba(53,87,125,0.2);
}

.input input::placeholder {
  color: var(--txt-ter);
}

/* BOTON OJO - CORREGIDO */
.toggle {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 3;
  padding: 8px;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--txt-ter);
  transition: all 0.2s ease;
  border-radius: 6px;
  line-height: 1;
}

.toggle:hover {
  color: var(--mid);
  background: rgba(53, 87, 125, 0.15);
  transform: translateY(-50%) scale(1.05);
}

.toggle:active {
  transform: translateY(-50%) scale(0.98);
}

.toggle i {
  pointer-events: none;
  font-size: 1.2rem;
  display: block;
}

/* BOTÓN LOGIN */
.btn {
  width: 100%;
  padding: 13px;
  border-radius: 10px;
  border: none;
  background: linear-gradient(135deg, var(--mid), var(--dark));
  color: white;
  cursor: pointer;
  margin-top: 18px;
  transition: all 0.3s ease;
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--sombra-md);
  filter: brightness(1.05);
}

.btn:active {
  transform: translateY(0);
}

/* ALERTA */
.alert {
  background: rgba(220, 38, 38, 0.12);
  border: 1px solid rgba(220, 38, 38, 0.3);
  padding: 12px;
  border-radius: 10px;
  margin-bottom: 20px;
  font-size: 0.85rem;
  display: flex;
  gap: 10px;
  align-items: center;
  color: #f87171;
}

.alert i {
  font-size: 1.1rem;
}

/* FOOTER */
.footer {
  text-align: center;
  margin-top: 25px;
  font-size: 0.75rem;
  color: var(--txt-ter);
  padding-top: 15px;
  border-top: 1px solid var(--borde);
}

/* TABLET (768px - 1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
  .login-card {
    max-width: 450px;
    padding: 40px;
  }
  
  .login-header h2 {
    font-size: 2rem;
  }
  
  .icon {
    font-size: 3.2rem;
  }
  
  .input input {
    padding: 13px 55px 13px 45px;
    font-size: 1rem;
  }
  
  .toggle {
    right: 15px;
    padding: 10px;
    font-size: 1.3rem;
  }
  
  .toggle i {
    font-size: 1.3rem;
  }
  
  .btn {
    padding: 14px;
    font-size: 1.05rem;
  }
}

/* MÓVIL GRANDE (480px - 767px) */
@media (min-width: 480px) and (max-width: 767px) {
  .login-card {
    max-width: 380px;
    padding: 30px;
  }
  
  .login-header h2 {
    font-size: 1.6rem;
  }
  
  .icon {
    font-size: 2.8rem;
  }
  
  .input input {
    padding: 11px 50px 11px 40px;
  }
  
  .toggle {
    right: 10px;
    padding: 7px;
    font-size: 1.1rem;
  }
  
  .toggle i {
    font-size: 1.1rem;
  }
}

/* MÓVIL PEQUEÑO (menos de 480px) */
@media (max-width: 479px) {
  .login-card {
    max-width: 100%;
    padding: 25px 20px;
  }
  
  .login-header {
    margin-bottom: 22px;
  }
  
  .login-header h2 {
    font-size: 1.5rem;
  }
  
  .icon {
    font-size: 2.5rem;
    margin-bottom: 8px;
  }
  
  .login-header p {
    font-size: 0.8rem;
  }
  
  .field {
    margin-bottom: 18px;
  }
  
  .field label {
    font-size: 0.8rem;
    margin-bottom: 6px;
  }
  
  .input input {
    padding: 10px 45px 10px 38px;
    font-size: 0.9rem;
  }
  
  .input > i:first-child {
    left: 12px;
    font-size: 0.9rem;
  }
  
  .toggle {
    right: 8px;
    padding: 6px;
    font-size: 1rem;
  }
  
  .toggle i {
    font-size: 1rem;
  }
  
  .btn {
    padding: 11px;
    font-size: 0.95rem;
    margin-top: 15px;
  }
  
  .alert {
    padding: 10px;
    margin-bottom: 18px;
    font-size: 0.8rem;
  }
  
  .footer {
    margin-top: 20px;
    padding-top: 12px;
  }
}

/* ALTURAS PEQUEÑAS (max-height: 650px) */
@media (max-height: 650px) {
  .login-card {
    padding: 20px 25px;
  }
  
  .login-header {
    margin-bottom: 15px;
  }
  
  .login-header h2 {
    font-size: 1.4rem;
    margin-bottom: 4px;
  }
  
  .icon {
    font-size: 2rem;
    margin-bottom: 5px;
  }
  
  .field {
    margin-bottom: 12px;
  }
  
  .btn {
    margin-top: 12px;
    padding: 10px;
  }
  
  .footer {
    margin-top: 12px;
    padding-top: 10px;
  }
}

/* LANDSCAPE (orientación horizontal en móvil) */
@media (max-width: 850px) and (orientation: landscape) {
  .login-wrapper {
    padding: 15px;
  }
  
  .login-card {
    padding: 20px;
    max-width: 380px;
  }
  
  .login-header {
    margin-bottom: 12px;
  }
  
  .login-header h2 {
    font-size: 1.3rem;
  }
  
  .icon {
    font-size: 1.8rem;
    margin-bottom: 4px;
  }
  
  .field {
    margin-bottom: 10px;
  }
  
  .input input {
    padding: 9px 45px 9px 38px;
  }
  
  .toggle {
    padding: 5px;
  }
  
  .btn {
    margin-top: 10px;
    padding: 8px;
  }
  
  .footer {
    margin-top: 10px;
    padding-top: 8px;
  }
}