/* Variables CSS para temas */
:root {
  /* Colores claros */
  --bg-color: #f5f5f5;
  --header-bg: #ffffff;
  --text-color: #333333;
  --border-color: #e0e0e0;
  --user-message-bg: #2196f3;
  --user-message-text: #ffffff;
  --ai-message-bg: #ffffff;
  --ai-message-text: #333333;
  --input-bg: #ffffff;
  --button-bg: #2196f3;
  --button-text: #ffffff;
  --hover-color: #1976d2;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  --border-radius: 12px;
  --error-color: #f44336;
  --success-color: #4caf50;
  --warning-color: #ff9800;
  /* Safe area insets - valores por defecto */
  --safe-area-inset-top: env(safe-area-inset-top, 0px);
  --safe-area-inset-bottom: env(safe-area-inset-bottom, 0px);
  --safe-area-inset-left: env(safe-area-inset-left, 0px);
  --safe-area-inset-right: env(safe-area-inset-right, 0px);
}

/* Variables para modo oscuro */
[data-theme="dark"] {
  --bg-color: #121212;
  --header-bg: #1e1e1e;
  --text-color: #e0e0e0;
  --border-color: #333333;
  --user-message-bg: #0d47a1;
  --user-message-text: #ffffff;
  --ai-message-bg: #1e1e1e;
  --ai-message-text: #e0e0e0;
  --input-bg: #1e1e1e;
  --button-bg: #2196f3;
  --button-text: #ffffff;
  --hover-color: #64b5f6;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  height: 100vh;
  height: -webkit-fill-available; /* Para Safari */
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-overflow-scrolling: touch;
  -webkit-text-size-adjust: 100%;
  padding: var(--safe-area-inset-top) var(--safe-area-inset-right) var(--safe-area-inset-bottom) var(--safe-area-inset-left);
  touch-action: manipulation; /* Prevenir zoom automático en inputs */
}

/* Contenedor principal - CSS Grid */
.chat-container {
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-areas: 
    "header"
    "messages"
    "input";
  height: 100vh;
  max-height: 100vh; /* Prevenir desbordamiento */
  height: -webkit-fill-available; /* Para Safari */
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  background-color: var(--bg-color);
  position: relative;
  overflow: hidden;
  padding: 0 var(--safe-area-inset-right) 0 var(--safe-area-inset-left);
}

/* Ancho más amplio para desktop */
@media (min-width: 768px) {
  .chat-container {
    width: 80%;
    max-width: 1400px;
  }
}

/* Header - Posición fija */
.chat-header {
  grid-area: header;
  background-color: var(--header-bg);
  padding: 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  z-index: 20;
  position: sticky;
  top: 0;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chat-header h1 {
  font-size: 1.25rem;
  font-weight: normal;
}

.settings-btn {
  background-color: var(--button-bg);
  color: var(--button-text);
  border: none;
  border-radius: var(--border-radius);
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  font-weight: 500;
  transition: background-color 0.2s;
  font-size: 0.85rem;
}

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

.control-btn {
  background-color: var(--button-bg);
  color: var(--button-text);
  border: none;
  border-radius: var(--border-radius);
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  font-weight: 500;
  transition: background-color 0.2s;
  font-size: 0.85rem;
}

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

.user-btn {
  background-color: #6c757d; /* Gris */
  color: white;
  border: none;
  border-radius: var(--border-radius);
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  font-weight: 500;
  transition: background-color 0.2s;
  font-size: 0.85rem;
}

.user-btn:hover {
  background-color: #5a6268; /* Gris más oscuro */
}

#iterationsInput {
  width: 50px;
  padding: 0.4rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background-color: var(--input-bg);
  color: var(--text-color);
  text-align: center;
  font-size: 0.9rem; /* Prevenir zoom en móvil */
}

/* Menú de usuario */
.user-menu {
  position: absolute;
  top: 60px;
  right: 1rem;
  background-color: var(--header-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  width: 200px;
  z-index: 100;
  display: none;
}

.user-menu.show {
  display: block;
}

.credits-section {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}

.credits-label {
  font-weight: 500;
  color: var(--text-color);
  font-size: 0.9rem;
}

.credits-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--button-bg);
  margin-left: 0.5rem;
}

.menu-item {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem;
  background: none;
  border: none;
  text-align: left;
  color: var(--text-color);
  cursor: pointer;
  font-size: 0.9rem;
  transition: background-color 0.2s;
}

.menu-item:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .menu-item:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

.menu-item:last-child {
  border-top: 1px solid var(--border-color);
  margin-top: 0.25rem;
  padding-top: 0.75rem;
}

.messages-container {
  grid-area: messages;
  overflow-y: auto;
  padding: 1rem;
  padding-bottom: calc(var(--safe-area-inset-bottom) + 1rem);
  display: flex;
  flex-direction: column;
  overscroll-behavior: contain;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  min-height: 0;
  max-height: 100%; /* Limitar altura máxima */
}

.message-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex: 1;
}

.input-container {
  grid-area: input;
  padding: 0.75rem;
  padding-bottom: calc(0.75rem + var(--safe-area-inset-bottom));
  background-color: var(--header-bg);
  border-top: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  z-index: 10;
}

.input-wrapper {
  display: flex;
  gap: 0.5rem;
}

#messageInput {
  flex: 1;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background-color: var(--input-bg);
  color: var(--text-color);
  font-size: 1rem;
  resize: none;
  min-height: 40px;
  max-height: 120px;
  font-size: 16px; /* Prevenir zoom en móvil */
  touch-action: manipulation; /* Mejor experiencia táctil */
  overflow-y: hidden; /* Ocultar scroll nativo */
  line-height: 1.4; /* Mejor legibilidad */
  -webkit-appearance: none; /* Prevenir estilos por defecto en iOS */
  -moz-appearance: none;
  appearance: none;
}

#messageInput:focus {
  outline: none;
  border-color: var(--button-bg);
  box-shadow: 0 0 0 2px rgba(33, 150, 243, 0.2);
}

.send-btn {
  padding: 0.5rem 1rem;
  background-color: var(--button-bg);
  color: var(--button-text);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  transition: background-color 0.2s;
  font-size: 0.9rem;
  touch-action: manipulation; /* Mejor experiencia táctil */
}

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

.send-btn:disabled {
  background-color: #9e9e9e;
  cursor: not-allowed;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 100;
  justify-content: center;
  align-items: center;
}

.modal-content {
  background-color: var(--header-bg);
  border-radius: var(--border-radius);
  width: 90%;
  max-width: 500px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.modal-content.downloads-modal {
  max-width: 600px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-color);
  padding: 0.25rem;
  border-radius: 50%;
}

.close-btn:hover {
  background-color: rgba(0, 0, 0, 0.1);
}

.modal-body {
  padding: 1rem;
}

.setting-item {
  margin-bottom: 1rem;
}

.setting-item label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.setting-item input,
.setting-item select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--input-bg);
  color: var(--text-color);
  font-size: 1rem;
}

.setting-item input:focus,
.setting-item select:focus {
  outline: none;
  border-color: var(--button-bg);
  box-shadow: 0 0 0 2px rgba(33, 150, 243, 0.2);
}

/* Botones del modal MIDI Gen */
.modal-buttons {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  margin-top: 1.5rem;
}

#midiGenMessage {
  margin-bottom: 1rem;
}

/* Panel de descargas */
.downloads-toolbar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.downloads-toolbar .control-btn {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

.downloads-list {
  max-height: 300px;
  overflow-y: auto;
}

.download-item {
  display: flex;
  align-items: center;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  margin-bottom: 0.5rem;
  background-color: var(--message-user-bg);
}

.download-item:last-child {
  margin-bottom: 0;
}

.download-item input[type="checkbox"] {
  margin-right: 0.75rem;
}

.download-item-info {
  flex: 1;
}

.download-item-name {
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.download-item-size {
  font-size: 0.85rem;
  opacity: 0.7;
}

.download-item-actions {
  display: flex;
  gap: 0.5rem;
}

.download-item-actions .control-btn {
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
}

/* Scrollbar personalizado */
.messages-container::-webkit-scrollbar {
  width: 8px;
}

.messages-container::-webkit-scrollbar-track {
  background: transparent;
}

.messages-container::-webkit-scrollbar-thumb {
  background-color: rgba(0, 0, 0, 0.2);
  border-radius: 4px;
}

.messages-container::-webkit-scrollbar-thumb:hover {
  background-color: rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .messages-container::-webkit-scrollbar-thumb {
  background-color: rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .messages-container::-webkit-scrollbar-thumb:hover {
  background-color: rgba(255, 255, 255, 0.3);
}