:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f7f7f8;
  --bg-tertiary: #e9eaed;
  --bg-input: #ffffff;
  --text-primary: #202123;
  --text-secondary: #6e6e80;
  --text-user-message: #ffffff;
  --text-meta: #a0a0a0;
  --text-meta-user: #e0e0e0;
  --border-color: #dcdfe4;
  --accent-color: #107ea3;
  --accent-text-color: #ffffff;
  --message-user-bg: var(--accent-color);
  --message-other-bg: #f0f0f0;
  --icon-color: #6e6e80;
  --icon-hover-bg: #e0e0e0;
  --shadow-color: rgba(0, 0, 0, 0.05);
  --scrollbar-thumb-color: color-mix(in srgb, var(--text-secondary) 40%, transparent);
  --scrollbar-thumb-hover-color: color-mix(in srgb, var(--text-secondary) 60%, transparent);
}

body.dark-mode {
  --bg-primary: #202123;
  --bg-secondary: #343541;
  --bg-tertiary: #2a2b32;
  --bg-input: #40414f;
  --text-primary: #ececf1;
  --text-secondary: #a9a9b3;
  --text-user-message: #ececf1;
  --text-meta: #8e8e8e;
  --text-meta-user: #b0b0b0;
  --border-color: #565869;
  /* --accent-color: #10a37f; */
  /* Mantenemos el acento o podríamos cambiarlo */
  /* --accent-text-color: #ffffff; */
  --message-user-bg: #2b4857;
  --message-other-bg: #444654;
  --icon-color: #a9a9b3;
  --icon-hover-bg: #565869;
  --shadow-color: rgba(0, 0, 0, 0.2);
  --scrollbar-thumb-color: color-mix(in srgb, var(--text-secondary) 30%, transparent);
  --scrollbar-thumb-hover-color: color-mix(in srgb, var(--text-secondary) 50%, transparent);
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: "Söhne", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s, color 0.3s;
}

#chat-app {
  width: 100vw;
  height: 100vh;
  display: grid;
  grid-template-columns: minmax(220px, 1.2fr) 4fr;
  grid-template-rows: auto 1fr;
  grid-template-areas:
    "header header"
    "side-panel main-chat";
  background-color: var(--bg-secondary);
  transition: background-color 0.3s;
}

#app-header {
  grid-area: header;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-primary);
  transition: background-color 0.3s, border-color 0.3s;
  height: 60px;
  z-index: 10;
}

#user-controls, #chat-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

#user-info-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

#user-info-header input#who {
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.9rem;
  background-color: var(--bg-input);
  color: var(--text-primary);
  transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

#user-info-header input#who:disabled {
  background-color: transparent;
  border-color: transparent;
  font-weight: 500;
}

#user-info-header button {
  padding: 8px 10px;
  border: none;
  border-radius: 6px;
  background-color: var(--accent-color);
  color: var(--accent-text-color);
  cursor: pointer;
  font-size: 0.85rem;
  transition: opacity 0.2s, background-color 0.3s;
}

#user-info-header button:hover {
  opacity: 0.85;
}

#search-messages-input {
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.9rem;
  background-color: var(--bg-input);
  color: var(--text-primary);
  min-width: 200px;
}

#theme-toggle-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
  color: var(--icon-color);
  transition: color 0.3s;
}

#theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* Side Panel: User List and Recent Messages */
#side-panel {
  grid-area: side-panel;
  background-color: var(--bg-tertiary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: background-color 0.3s, border-color 0.3s;
}

#side-panel h3 {
  padding: 15px 15px 10px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 0;
}

#user-list-container {
  flex-shrink: 0;
  overflow-y: auto;
  padding-bottom: 10px;
}

#connected-users-list {
  list-style: none;
  padding: 0 10px;
}

#connected-users-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 5px;
  font-size: 0.9rem;
  color: var(--text-primary);
  border-radius: 4px;
  cursor: default;
  white-space: nowrap;
  overflow: hidden;
}

#connected-users-list li:hover {
  background-color: var(--icon-hover-bg);
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 500;
  color: white;
  flex-shrink: 0;
}

.user-name-list {
  overflow: hidden;
  text-overflow: ellipsis;
}

#recent-messages-panel {
  flex-grow: 1;
  overflow-y: auto;
  padding-top: 0;
}

#recent-messages-list {
  list-style: none;
  padding: 0 10px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.recent-message-item {
  font-size: 0.8rem;
  padding: 6px 8px;
  border-radius: 4px;
  background-color: var(--message-other-bg);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.recent-message-item .sender {
  font-weight: 600;
  color: var(--accent-color);
}

.recent-message-item.user {
  background-color: var(--message-user-bg);
  color: var(--text-user-message);
}

.recent-message-item.user .sender {
  color: color-mix(in srgb, var(--accent-text-color) 80%, transparent);
}


/* Main Chat Area */
#main-chat-area {
  grid-area: main-chat;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: var(--bg-secondary);
}

#load-older-messages-btn {
  display: block;
  margin: 10px auto;
  padding: 8px 15px;
  border: 1px solid var(--accent-color);
  color: var(--accent-color);
  background-color: transparent;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background-color 0.2s, color 0.2s;
}

#load-older-messages-btn:hover {
  background-color: var(--accent-color);
  color: var(--accent-text-color);
}

#load-older-messages-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#messages-list {
  flex-grow: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.message-item {
  display: flex;
  flex-direction: column;
  max-width: 75%;
}

.message-item.user {
  align-self: flex-end;
}

.message-item.other {
  align-self: flex-start;
}

.message-sender {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 5px;
  transition: color 0.3s;
}

.message-item.user .message-sender {
  text-align: right;
}

.message-content-wrapper {
  position: relative;
  padding: 8px 12px;
  padding-bottom: 22px;
  border-radius: 18px;
  line-height: 1.45;
  font-size: 0.9rem;
  word-wrap: break-word;
  transition: background-color 0.3s, color 0.3s;
  box-shadow: 0 1px 2px var(--shadow-color);
}

.message-item.user .message-content-wrapper {
  background-color: var(--message-user-bg);
  color: var(--text-user-message);
  border-bottom-right-radius: 5px;
}

.message-item.other .message-content-wrapper {
  background-color: var(--message-other-bg);
  color: var(--text-primary);
  border-bottom-left-radius: 5px;
}

.message-timestamp {
  position: absolute;
  bottom: 5px;
  right: 10px;
  font-size: 0.7rem;
  color: var(--text-meta);
}

.message-item.user .message-timestamp {
  color: var(--text-meta-user);
}

.message-image-container {
  width: 200px;
  height: 150px;
  overflow: hidden;
  border-radius: 6px;
  margin-top: 5px;
  background-color: var(--message-other-bg);
  cursor: zoom-in;
  transition: background-color 0.3s;
}

.message-image-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.message-content-wrapper.image-only {
  padding-bottom: 22px;
}


/* Message Input Area */
#message-input-area {
  padding: 12px 20px;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background-color 0.3s, border-color 0.3s;
  min-height: 80px;
  flex-shrink: 0;
}

#input-actions {
  display: flex;
  gap: 8px;
}

.action-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--icon-color);
  cursor: pointer;
  padding: 8px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, border-color 0.3s, color 0.3s;
}

.action-btn:hover {
  background-color: var(--icon-hover-bg);
}

.action-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

#message-form {
  display: flex;
  gap: 10px;
  align-items: center;
}

#message-form input#what {
  flex-grow: 1;
  min-width: 0;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.9rem;
  background-color: var(--bg-input);
  color: var(--text-primary);
  resize: none;
  transition: background-color 0.3s, border-color 0.3s, color 0.3s, box-shadow 0.2s;
}

#message-form input#what:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent-color) 20%, transparent);
}

#message-form input[type="submit"] {
  flex-shrink: 0;
  padding: 10px 16px;
  border: none;
  border-radius: 20px;
  background-color: var(--accent-color);
  color: var(--accent-text-color);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: opacity 0.2s, background-color 0.3s;
}

#message-form input[type="submit"]:hover {
  opacity: 0.85;
}

emoji-picker {
  position: absolute;
  bottom: 75px;
  right: 20px;
  z-index: 1000;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
  border-radius: 8px;
}

/* Scrollbars */
#messages-list::-webkit-scrollbar, #user-list-container::-webkit-scrollbar, #recent-messages-panel::-webkit-scrollbar {
  width: 8px;
}

#messages-list::-webkit-scrollbar-track, #user-list-container::-webkit-scrollbar-track, #recent-messages-panel::-webkit-scrollbar-track {
  background: transparent;
}

#messages-list::-webkit-scrollbar-thumb, #user-list-container::-webkit-scrollbar-thumb, #recent-messages-panel::-webkit-scrollbar-thumb {
  background-color: var(--scrollbar-thumb-color);
  border-radius: 10px;
}

#messages-list::-webkit-scrollbar-thumb:hover, #user-list-container::-webkit-scrollbar-thumb:hover, #recent-messages-panel::-webkit-scrollbar-thumb:hover {
  background-color: var(--scrollbar-thumb-hover-color);
}

#image-modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.85);
  justify-content: center;
  align-items: center;
}

#image-modal img {
  max-width: 90%;
  max-height: 90%;
  display: block;
  margin: auto;
  border-radius: 4px;
  animation: zoomIn 0.3s ease-out;
}

@keyframes zoomIn {
  from {
    transform: scale(0.8);
    opacity: 0;
  }

  to {
    transform: scale(1);
    opacity: 1;
  }
}

#image-modal-close {
  position: absolute;
  top: 20px;
  right: 35px;
  color: #f1f1f1;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
  transition: color 0.2s;
}

#image-modal-close:hover {
  color: #bbb;
}

/* Mobile adjustments */
@media (max-width: 768px) {
  #chat-app {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas:
      "header"
      "main-chat";
  }

  #side-panel {
    display: none;
  }

  #app-header {
    flex-wrap: wrap;
    height: auto;
    min-height: 60px;
  }

  #search-messages-input {
    width: 100%;
    margin-top: 5px;
  }

  .message-item {
    max-width: 85%;
  }

  emoji-picker {
    bottom: 70px;
    right: 15px;
  }
}