:root {
  --color-primary: #1a73e8;
  --color-primary-dark: #1558b0;
  --color-primary-light: #e8f0fe;
  --color-success: #2ecc71;
  --color-danger: #e74c3c;
  --color-danger-dark: #c0392b;
  --color-bg: #f0f4f8;
  --color-white: #ffffff;
  --color-text: #2d3748;
  --color-text-muted: #718096;
  --color-border: #e2e8f0;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.15);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --font-main: 'Segoe UI', system-ui, sans-serif;
  --transition: 0.2s ease;
}

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

/*BODY Y FONDO*/
body {
  font-family: var(--font-main);
  font-size: 18px;
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}

/*BOTONES DE INICIO*/
#containsButtons {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  padding: 20px;
}

#createAccount,
#initialAccount {
  background: var(--color-white);
  color: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  width: 280px;
  padding: 28px 24px;
  font-size: 1.1em;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

#createAccount:hover,
#initialAccount:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.25);
}

#createAccount:active,
#initialAccount:active {
  transform: translateY(0px);
}

#createAccount {
  background: var(--color-primary);
  color: var(--color-white);
}

/*MODALES (FONDO OSCURO)*/
#modalCreateAccount,
#modalInitialAccount {
  width: 100%;
  height: 100%;
  display: none;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 100;
  padding: 20px;
  overflow-y: auto;
}

/*FORMULARIOS*/
form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--color-white);
  padding: 36px 32px;
  border-radius: var(--radius-lg);
  position: relative;
  width: 100%;
  max-width: 440px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-md);
  scrollbar-width: thin;
  scrollbar-color: #c0cfe8 transparent;
}

form::-webkit-scrollbar {
  width: 6px;
}

form::-webkit-scrollbar-track {
  background: transparent;
  margin: 16px 0;
}

form::-webkit-scrollbar-thumb {
  background-color: #c0cfe8;
  border-radius: 99px;
}

form::-webkit-scrollbar-thumb:hover {
  background-color: var(--color-primary);
}


form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85em;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

input {
  width: 100%;
  padding: 12px 16px;
  font-size: 1em;
  font-family: var(--font-main);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  background: var(--color-bg);
}

input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
  background: var(--color-white);
}

form > button[type="submit"],
form > button:not(.closeCreateAccount):not(.closeInitialAccount) {
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-sm);
  padding: 14px;
  font-size: 1em;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  margin-top: 8px;
  transition: background var(--transition), transform var(--transition);
}

form > button:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

/*BOTÓN DE CERRAR MODAL (X) */
.closeCreateAccount,
.closeInitialAccount {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 32px;
  height: 32px;
  background: var(--color-danger);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  font-size: 0.8em;
  font-weight: bold;
  transition: background var(--transition), transform var(--transition);
}

.closeCreateAccount:hover,
.closeInitialAccount:hover {
  background: var(--color-danger-dark);
  transform: scale(1.1);
}

/*CAJERO (VISTA PRINCIPAL)*/
#cashier {
  display: none;
  width: 100%;
  max-width: 640px;
  padding: 24px;
}

/*BOTONES PRINCIPALES DEL CAJERO*/
#mainButtons {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

#mainButtons > button:not(#returnButtonCashier) {
  background: var(--color-white);
  color: var(--color-text);
  border: none;
  border-radius: var(--radius-md);
  padding: 32px 16px;
  font-size: 1em;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

#mainButtons > button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

#deposit { border-top: 4px solid var(--color-success); }
#remove { border-top: 4px solid var(--color-danger); }
#transfer { border-top: 4px solid var(--color-primary); }
#viewBalance { border-top: 4px solid #f39c12; }

/*BOTONES DE MONTOS*/
#secondaryButtons {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

#secondaryButtons > button:not(.returnButtonMainButtons) {
  background: var(--color-white);
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 20px 12px;
  font-size: 1em;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  transition: all var(--transition);
}

#secondaryButtons > button:hover {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  transform: scale(1.03);
}

.moneyButtonInput {
  grid-column: span 2;
  background: var(--color-primary-light) !important;
  color: var(--color-primary) !important;
  border: 1.5px dashed var(--color-primary) !important;
}

.moneyButtonInput:hover {
  background: var(--color-primary) !important;
  color: var(--color-white) !important;
}

/*FORMULARIO DE TRANSFERENCIA
#transferInput {
  display: none;
  flex-direction: column;
  gap: 16px;
}

#formTransfer {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  max-width: 100%;
}

/*BOTONES DE RETORNO*/
#returnButtonCashier,
.returnButtonMainButtons {
  position: fixed;
  top: 16px;
  left: 16px;
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  color: var(--color-white);
  border: 1.5px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  font-size: 0px;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background var(--transition), transform var(--transition);
  z-index: 10;
}

#returnButtonCashier::before,
.returnButtonMainButtons::before {
  content: "";
  display: block;
  width: 18px;
  height: 18px;
  background-color: var(--color-white);
  /* Flecha apuntando a la izquierda usando clip-path */
  clip-path: polygon(
    40% 0%,
    0% 50%,
    40% 100%,
    40% 70%,
    100% 70%,
    100% 30%,
    40% 30%
  );
}

#returnButtonCashier:hover,
.returnButtonMainButtons:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.08) translateX(-2px);
}

/* ========================
   MEDIA QUERIES
   ======================== */

@media screen and (max-width: 420px) {
  body {
    font-size: 15px;
    align-items: flex-start;
    padding-top: 72px;
  }

  #createAccount,
  #initialAccount {
    width: 100%;
  }

  form {
    padding: 24px 16px;
    border-radius: var(--radius-md);
  }

  #cashier {
    padding: 10px;
  }

  #mainButtons,
  #secondaryButtons {
    grid-template-columns: 1fr;
  }

  .moneyButtonInput {
    grid-column: span 1;
  }
}

@media screen and (max-width: 600px) {
  body {
    font-size: 16px;
    align-items: flex-start;
    padding-top: 80px;
  }

  #mainButtons {
    grid-template-columns: 1fr 1fr;
  }

  #secondaryButtons {
    grid-template-columns: 1fr 1fr;
  }

  #mainButtons > button:not(#returnButtonCashier) {
    padding: 22px 12px;
  }

  #secondaryButtons > button:not(.returnButtonMainButtons) {
    padding: 16px 8px;
  }

  #returnButtonCashier,
  .returnButtonMainButtons {
    width: 42px;
    height: 42px;
    top: 12px;
    left: 12px;
  }

  #returnButtonCashier::before,
  .returnButtonMainButtons::before {
    width: 15px;
    height: 15px;
  }
}

/* Tablet */
@media screen and (min-width: 601px) and (max-width: 900px) {
  #cashier {
    max-width: 560px;
  }
}

/* Pantallas grandes */
@media screen and (min-width: 1200px) {
  body {
    font-size: 20px;
  }

  #createAccount,
  #initialAccount {
    width: 320px;
    padding: 32px 28px;
  }

  #cashier {
    max-width: 760px;
  }
}