static/styles.css

/* Global Layout */
body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(-45deg, #0f0f0f, #1a1a1a, #2c2c2c, #000000);
  background-size: 400% 400%;
  animation: gradientBG 18s ease infinite;
  display: flex;
  height: 100vh;
  overflow: hidden;
  color: white;
}

@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Sidebar (Chat History) */
.sidebar {
  width: 300px;
  background: rgba(20, 20, 20, 0.8);
  padding: 1rem;
  overflow-y: auto;
  border-right: 2px solid rgba(255, 255, 255, 0.1);
  box-shadow: inset -2px 0 8px rgba(0, 0, 0, 0.3);
}

.sidebar h2 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: #66ffff;
  text-align: center;
}

#history-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.95rem;
}

#history-list li {
  margin-bottom: 0.8rem;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.5rem;
  border-radius: 10px;
  transition: background 0.3s;
}

#history-list li:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* Chat Container */
.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  background: rgba(0, 0, 0, 0.25);
  overflow: hidden;
  position: relative;
}

/* Chat Header */
.chat-container h1 {
  text-align: center;
  color: #ffffff;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
  margin-bottom: 1rem;
  font-size: 2rem;
}

/* Chat Messages */
.chat-box {
  flex: 1;
  overflow-y: auto;
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1rem;
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  box-shadow: inset 0 0 12px rgba(0, 0, 0, 0.2);
  scroll-behavior: smooth;
  display: flex;
  flex-direction: column;
  margin-bottom: 1rem;
}

/* Individual messages */
.msg {
  margin-bottom: 1rem;
  padding: 0.6rem 1rem;
  border-radius: 10px;
  max-width: 90%;
  word-wrap: break-word;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(4px);
  animation: fadeIn 0.4s ease;
}

.user-msg {
  align-self: flex-end;
  background: rgba(0, 162, 255, 0.2);
  color: #80d8ff;
  text-align: right;
}

.bot-msg {
  align-self: flex-start;
  background: rgba(0, 255, 170, 0.15);
  color: #a7ffeb;
  text-align: left;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Chat Input Area */
form {
  display: flex;
  gap: 0.5rem;
}

input[type="text"] {
  flex: 1;
  padding: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  font-size: 1rem;
  background: rgba(255, 255, 255, 0.05);
  color: white;
  outline: none;
  transition: box-shadow 0.3s ease;
}

input[type="text"]::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

input[type="text"]:focus {
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.4);
}

button {
  background: linear-gradient(135deg, #00c6ff, #0072ff);
  color: white;
  border: none;
  padding: 0.8rem 1.4rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 0 15px rgba(0, 198, 255, 0.5);
  transition: all 0.3s ease-in-out;
  position: relative;
  overflow: hidden;
}

button::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0%;
  height: 0%;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.5s ease, height 0.5s ease;
}

button:hover::before {
  width: 300%;
  height: 300%;
}

button:hover {
  box-shadow: 0 0 18px rgba(0, 210, 255, 0.8), 0 0 28px rgba(58, 71, 213, 0.6);
  transform: scale(1.05);
}

/* Responsive */
@media (max-width: 768px) {
  body {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
    max-height: 200px;
    overflow-y: auto;
  }

  .chat-container {
    padding: 1rem;
  }

  .chat-box {
    height: 300px;
  }
}

/* 🔘 Selected chat session */
#history-list li.active {
  background-color: rgba(0, 255, 255, 0.25);
  border: 1px solid rgba(0, 255, 255, 0.4);
}

/* 🗑️ Delete session button inside list item */
.session-entry {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.session-entry button.delete-btn {
  background: transparent;
  border: none;
  color: #ff6666;
  font-size: 1rem;
  cursor: pointer;
  margin-left: 8px;
  transition: transform 0.2s ease;
}

.session-entry button.delete-btn:hover {
  transform: scale(1.2);
}

/* ➕ New Chat Button */
#new-chat-btn {
  width: 100%;
  padding: 0.6rem;
  background: linear-gradient(135deg, #1de9b6, #00bcd4);
  color: #fff;
  border: none;
  font-weight: bold;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 1rem;
  box-shadow: 0 0 12px rgba(0, 255, 255, 0.4);
  transition: all 0.3s ease;
}

#new-chat-btn:hover {
  transform: scale(1.03);
  box-shadow: 0 0 16px rgba(0, 255, 255, 0.6);
}