:root {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --card-bg: #171717;
  --button-bg: #075e2b;
  --hover-bg: #0a8c40;
  --message-bg-color: #075e2b;
  --scroll-color: #075e2b #1d1d1d;
  --input-area-bg-color: #212121;
  --input-bg-color: #272727;
  --input-text-color: #ebebeb;
  --header-bg: linear-gradient(90deg, #0f0f0f, #1f1f1f);
  --highlight-color: #4ba302;
  --link-color: #76ff03;
  --shadow-color: rgba(0, 0, 0, 0.8);
}

[data-theme="light"] {
  --bg-color: #ffffff;
  --text-color: #121212;
  --card-bg: #f0f0f0;
  --button-bg: #0051a8;
  --hover-bg: #0066d6;
  --message-bg-color: #0051a8;
  --scroll-color: #0051a8 #919191;
  --input-area-bg-color: #f0f0f0;
  --input-bg-color: #ffffff;
  --input-text-color: #000000;
  --header-bg: linear-gradient(90deg, #e0e0e0, #ffffff);
  --highlight-color: #0051a8;
  --link-color: #1b5e20;
  --shadow-color: rgba(0, 0, 0, 0.2);
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: 'Courier New', Courier, monospace;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
}

/* Scroll bar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-color);
}

/* Stars background */
.stars {
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  pointer-events: none;
  z-index: -1;
}
.stars::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: url('https://www.transparenttextures.com/patterns/stardust.png');
  opacity: 1;
  animation: starAnimation 100s linear infinite;
}
@keyframes starAnimation {
  0% { background-position: 0 0; }
  100% { background-position: 10000px 10000px; }
}

/* Chat container */
#chat-container {
  width: 100%;
  max-width: 600px;
  margin-top: 30px;
  background-color: var(--card-bg);
  border-radius: 10px;
  box-shadow: 0 0 15px rgba(0,0,0,0.3);
  overflow: hidden;
}

/* Header */
#header {
  background: var(--header-bg);
  padding: 15px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
#home-button {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 20px;
  cursor: pointer;
}

/* Footer */
#footer {
  text-align: center;
  font-size: 0.9em;
  color: #888;
  padding: 10px;
  border-top: 1px solid rgba(255,255,255,0.1);
}
#footer a {
  color: var(--link-color);
  text-decoration: none;
}
#footer a:hover {
  text-shadow: 0 0 5px var(--link-color);
}

/* Scroll bottom button */
#scroll-bottom {
  position: fixed;
  bottom: 20px;
  right: 40px;
  background-color: var(--button-bg);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  cursor: pointer;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}
#scroll-bottom:hover {
  background-color: var(--hover-bg);
}

/* Theme toggle */
#theme-toggle-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
}
#theme-toggle-button {
  background: transparent;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-color);
}

/* Input area */
#input-area {
  display: flex;
  align-items: center;
  padding: 10px;
  background-color: var(--input-area-bg-color);
  gap: 8px;
}
#input-field {
  flex: 1;
  resize: none;
  border: none;
  border-radius: 5px;
  padding: 10px;
  background: var(--input-bg-color);
  color: var(--input-text-color);
  font-size: 14px;
  outline: none;
  height: 40px;
}
#send-button, #emoji-button {
  background-color: var(--button-bg);
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 10px 12px;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.3s;
}
#send-button:hover, #emoji-button:hover {
  background-color: var(--hover-bg);
}

/* Typing indicator */
.typing-indicator {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 10px 0;
}
.typing-animation {
  display: flex;
  gap: 5px;
}
.dot {
  width: 8px;
  height: 8px;
  background-color: var(--text-color);
  border-radius: 50%;
  animation: blink 1.4s infinite both;
}
.dot:nth-child(2) { animation-delay: 0.2s; }
.dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink {
  0%, 80%, 100% { opacity: 0; }
  40% { opacity: 1; }
}