frontend/style.css

/* --- Reset and Base --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Inter", system-ui, sans-serif;
  background: radial-gradient(circle at top left, #0a0033, #000);
  color: #e0e8ff;
  height: 100vh;
  overflow: hidden;
}

/* --- App Layout --- */
.app-container {
  display: flex;
  height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
  width: 260px;
  background: rgba(9, 1, 32, 0.9);
  border-right: 1px solid rgba(120, 80, 255, 0.3);
  display: flex;
  flex-direction: column;
  padding: 16px;
  box-shadow: 0 0 20px rgba(120, 80, 255, 0.15);
}

.sidebar h2 {
  color: #9f7fff;
  text-align: center;
  margin-bottom: 16px;
  font-weight: 700;
  text-shadow: 0 0 6px rgba(140, 100, 255, 0.6);
}

.logo-container {
  text-align: center;
  margin-bottom: 20px;
  padding: 10px;
}

.logo {
  max-width: 140px;
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  filter: drop-shadow(0 0 10px rgba(120, 80, 255, 0.5));
}

.new-chat-btn {
  background: linear-gradient(135deg, #6a00ff, #00bfff);
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 0.9rem;
  cursor: pointer;
  margin-bottom: 16px;
  transition: 0.2s;
  box-shadow: 0 0 10px rgba(100, 160, 255, 0.4);
}

.new-chat-btn:hover {
  background: linear-gradient(135deg, #7a33ff, #33ccff);
  transform: scale(1.03);
}

.chat-history {
  flex: 1;
  overflow-y: auto;
  border-top: 1px solid rgba(120, 80, 255, 0.2);
  padding-top: 10px;
}

.chat-item {
  padding: 10px 12px;
  border-radius: 10px;
  margin-bottom: 8px;
  background: rgba(120, 80, 255, 0.05);
  cursor: pointer;
  transition: 0.2s;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding-right: 8px;
}

.chat-item:hover {
  background: rgba(120, 80, 255, 0.15);
}

.chat-item.active {
  background: rgba(120, 80, 255, 0.3);
  font-weight: 600;
}

/* --- Chat Area --- */
.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: linear-gradient(
      180deg,
      rgba(5, 0, 40, 0.85),
      rgba(0, 0, 30, 0.95)
    );
  border-left: 1px solid rgba(120, 80, 255, 0.2);
}

.chat-header {
  padding: 16px 24px;
  text-align: center;
  color: #c9d8ff;
  font-weight: 700;
  border-bottom: 1px solid rgba(120, 80, 255, 0.2);
  position: relative;

  /* ✨ Transparent Glass Look */
  background: rgba(10, 0, 40, 0.15);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  
  /* 🌈 Glow and Depth */
  text-shadow: 0 0 10px rgba(120, 80, 255, 0.4);
  box-shadow: 0 2px 20px rgba(120, 80, 255, 0.15);
  border-radius: 0 0 16px 16px;
  z-index: 10;
}

/* --- Hamburger Menu Button --- */
.menu-toggle {
  display: none;
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(120, 80, 255, 0.2);
  border: 1px solid rgba(120, 80, 255, 0.4);
  color: #9f7fff;
  font-size: 1.5rem;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.2s;
  z-index: 1000;
}

.menu-toggle:hover {
  background: rgba(120, 80, 255, 0.3);
  transform: translateY(-50%) scale(1.05);
}

/* --- Chat Box --- */
.chat-box {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  scroll-behavior: smooth;
}

/* --- Message Bubbles --- */
.message {
  display: flex;
  align-items: flex-start;
}

.message.user {
  justify-content: flex-end;
}

.bubble {
  max-width: 70%;
  padding: 12px 16px;
  border-radius: 14px;
  font-size: 0.95rem;
  line-height: 1.4;
  animation: fadeIn 0.2s ease-in-out;
}

.message.ai .bubble {
  background: rgba(10, 10, 40, 0.9);
  color: #7fb3ff;
  border: 1px solid rgba(100, 160, 255, 0.4);
  border-top-left-radius: 4px;
  box-shadow: 0 0 10px rgba(100, 160, 255, 0.15);
}

.message.user .bubble {
  background: linear-gradient(135deg, #6a00ff, #00bfff);
  color: #fff;
  border-top-right-radius: 4px;
  box-shadow: 0 0 10px rgba(100, 160, 255, 0.3);
}

/* --- Input --- */
.chat-input-container {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  border-top: 1px solid rgba(120, 80, 255, 0.2);
  background: rgba(10, 0, 40, 0.9);
}

.chat-input-container textarea {
  flex: 1;
  resize: none;
  border: none;
  outline: none;
  font-size: 1rem;
  padding: 10px;
  background: #0a0a2a;
  color: #fff;
  border-radius: 12px;
  margin-right: 8px;
  border: 1px solid rgba(100, 160, 255, 0.3);
}

.chat-input-container button {
  background: linear-gradient(135deg, #6a00ff, #00bfff);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  font-size: 1.1rem;
  cursor: pointer;
  transition: 0.2s;
  box-shadow: 0 0 10px rgba(100, 160, 255, 0.3);
}

.chat-input-container button:hover {
  transform: scale(1.1);
  background: linear-gradient(135deg, #7a33ff, #33ccff);
}

/* --- Delete Icon --- */
.delete-btn {
  background: none;
  border: none;
  color: #79aaff;
  cursor: pointer;
  opacity: 0.5;
  transition: all 0.2s;
  padding: 6px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
}

.delete-btn:hover {
  opacity: 1;
  color: #ff6b6b;
  background: rgba(255, 107, 107, 0.1);
  transform: scale(1.1);
}

.delete-btn svg {
  width: 16px;
  height: 16px;
}

.delete-btn:hover {
  opacity: 1;
  color: #33ccff;
}

/* --- Animated Moving Dots Background --- */
@keyframes moveDots {
  0% {
    background-position: 0 0, 50px 50px;
  }
  100% {
    background-position: 100px 100px, 150px 150px;
  }
}

.chat-container::before,
.chat-header::before {
  content: "";
  position: absolute;
  pointer-events: none;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    radial-gradient(rgba(120, 80, 255, 0.3) 2px, transparent 1px),
    radial-gradient(rgba(100, 160, 255, 0.15) 2px, transparent 1px);
  background-size: 50px 50px, 80px 80px;
  animation: moveDots 20s linear infinite;
  z-index: 0;
  opacity: 0.3;
}

/* Ensure content appears above the animated background */
.chat-container,
.chat-header {
  position: relative;
  z-index: 1;
  overflow: hidden;
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -260px;
    top: 0;
    height: 100vh;
    z-index: 999;
    transition: left 0.3s ease;
  }

  .sidebar.open {
    left: 0;
    box-shadow: 2px 0 15px rgba(0, 0, 0, 0.5);
  }

  .menu-toggle {
    display: block;
  }

  .chat-header h1 {
    font-size: 1.1rem;
    margin-left: 30px;
  }

  .bubble {
    max-width: 85%;
  }

  .chat-box {
    padding: 16px;
  }

  .chat-input-container {
    padding: 10px;
  }

  .chat-input-container textarea {
    font-size: 0.9rem;
    padding: 8px;
  }

  .chat-input-container button {
    width: 38px;
    height: 38px;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .bubble {
    max-width: 90%;
    font-size: 0.9rem;
    padding: 10px 14px;
  }

  .chat-header h1 {
    font-size: 1rem;
  }

  .new-chat-btn {
    font-size: 0.85rem;
    padding: 8px 10px;
  }
}