:root {
  --bg-color: #f4f7f9;
  --container-bg: #fff;
  --text-color: #333;
  --message-bg-sent: #007bff;
  --message-text-sent: #fff;
  --input-bg: #f9fafb;
  --input-border: #ddd;
  --border-color: #eef2f5;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --btn-hover: #0056b3;
}

[data-theme='dark'] {
  --bg-color: #121212;
  --container-bg: #1e1e1e;
  --text-color: #e0e0e0;
  --message-bg-sent: #3700b3;
  --message-text-sent: #fff;
  --input-bg: #2d2d2d;
  --input-border: #444;
  --border-color: #333;
  --shadow-color: rgba(0, 0, 0, 0.5);
  --btn-hover: #4a00e0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 20px 0;
  transition: background-color 0.3s, color 0.3s;
}

#chat-container {
  width: 90%;
  max-width: 800px;
  height: 700px;
  display: flex;
  flex-direction: column;
  background-color: var(--container-bg);
  border-radius: 12px;
  box-shadow: 0 10px 30px var(--shadow-color);
  overflow: hidden;
  position: relative;
  transition: background-color 0.3s, box-shadow 0.3s;
  margin-bottom: 40px;
}

#comments-section {
  width: 90%;
  max-width: 800px;
  background-color: var(--container-bg);
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 10px 30px var(--shadow-color);
  transition: background-color 0.3s, box-shadow 0.3s;
}

.header-controls {
  position: absolute;
  top: 15px;
  right: 15px;
  display: flex;
  gap: 10px;
  z-index: 10;
}

#theme-toggle, #partnership-btn {
  background: var(--container-bg);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 8px 15px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.3s;
  box-shadow: 0 2px 5px var(--shadow-color);
}

#theme-toggle:hover, #partnership-btn:hover {
  background-color: var(--border-color);
}

/* Partnership Modal Styles */
.hidden {
  display: none !important;
}

#partnership-modal {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
  backdrop-filter: blur(5px);
}

.modal-content {
  background-color: var(--container-bg);
  color: var(--text-color);
  padding: 30px;
  border-radius: 15px;
  width: 90%;
  max-width: 400px;
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

#close-modal {
  position: absolute;
  top: 15px;
  right: 15px;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--text-color);
  cursor: pointer;
  opacity: 0.7;
}

#close-modal:hover {
  opacity: 1;
}

.modal-content h2 {
  margin-top: 0;
  margin-bottom: 20px;
  font-size: 20px;
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-size: 14px;
  font-weight: 500;
}

.form-group input, .form-group textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--input-border);
  border-radius: 8px;
  background-color: var(--input-bg);
  color: var(--text-color);
  font-size: 14px;
  box-sizing: border-box;
}

.form-group textarea {
  height: 100px;
  resize: none;
}

.submit-btn {
  width: 100%;
  padding: 12px;
  background-color: var(--message-bg-sent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.2s;
}

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

#message-display {
  flex: 1;
  padding: 20px;
  padding-top: 60px;
  overflow-y: auto;
  border-bottom: 1px solid var(--border-color);
}

.message {
  margin-bottom: 15px;
  padding: 10px 15px;
  border-radius: 20px;
  max-width: 70%;
  line-height: 1.5;
  word-wrap: break-word;
}

.message.sent {
  background-color: var(--message-bg-sent);
  color: var(--message-text-sent);
  align-self: flex-end;
  border-bottom-right-radius: 5px;
}

#message-form {
  display: flex;
  padding: 20px;
  background-color: var(--input-bg);
}

#message-input {
  flex: 1;
  padding: 12px 15px;
  border: 1px solid var(--input-border);
  border-radius: 25px;
  font-size: 16px;
  outline: none;
  background-color: var(--container-bg);
  color: var(--text-color);
  transition: border-color 0.2s, background-color 0.3s, color 0.3s;
}

#message-input:focus {
  border-color: var(--message-bg-sent);
}

#message-form button {
  margin-left: 10px;
  padding: 12px 20px;
  border: none;
  background-color: var(--message-bg-sent);
  color: var(--message-text-sent);
  font-size: 16px;
  border-radius: 25px;
  cursor: pointer;
  outline: none;
  transition: background-color 0.2s;
}

#message-form button:hover {
  background-color: var(--btn-hover);
}