@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');

:root {
  /* Light Mode Variables */
  --bg-color: #ffffff;
  --text-main: #0d0d0d;
  --text-muted: #6e6e80;
  --header-bg: rgba(255, 255, 255, 0.85);
  --chat-user-bg: #f4f4f4;
  --chat-bot-bg: #ffffff;
  --input-bg: #f4f4f4;
  --input-border: #e5e5e5;
  --accent-color: #10a37f;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
  /* Dark Mode Variables */
  --bg-color: #212121;
  --text-main: #ececf1;
  --text-muted: #9b9b9b;
  --header-bg: rgba(33, 33, 33, 0.85);
  --chat-user-bg: #2f2f2f;
  --chat-bot-bg: #212121;
  --input-bg: #2f2f2f;
  --input-border: #2f2f2f;
  --accent-color: #10a37f;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
}

* { 
  margin: 0; 
  padding: 0; 
  box-sizing: border-box; 
  font-family: 'Inter', -apple-system, sans-serif; 
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  height: 100dvh;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow: hidden;
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 24px;
  background-color: var(--header-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--input-border);
  z-index: 10;
}

.logo-container { display: flex; align-items: center; gap: 10px; }
.logo-container img { height: 28px; width: 28px; border-radius: 6px; }
.logo-container h1 { font-size: 1.1rem; font-weight: 600; letter-spacing: 0.3px; }

.badge {
  background-color: rgba(16, 163, 127, 0.15);
  color: var(--accent-color);
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 12px;
  font-weight: 600;
  margin-left: 5px;
}

.theme-btn {
  background: none; border: none; cursor: pointer;
  color: var(--text-muted);
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 6px; transition: background 0.2s, color 0.2s;
}
.theme-btn:hover { background: var(--input-bg); color: var(--text-main); }
.theme-btn svg { width: 20px; height: 20px; }

/* Chat Container */
.chat-container {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  scroll-behavior: smooth;
  padding-bottom: 20px;
}

.message-wrapper {
  display: flex;
  width: 100%;
  padding: 12px 30px;
}

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

.message {
  display: flex;
  gap: 16px;
  line-height: 1.6;
  font-size: 1rem;
  padding: 16px 20px;
  animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  opacity: 0;
  max-width: 85%;
  border-radius: 18px;
}

.message-wrapper.bot .message {
  background-color: var(--chat-bot-bg);
  border: 1px solid var(--input-border);
  border-bottom-left-radius: 4px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.message-wrapper.user .message {
  background-color: var(--chat-user-bg);
  flex-direction: row-reverse;
  border-bottom-right-radius: 4px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

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

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 4px;
  flex-shrink: 0;
  object-fit: cover;
}

.user-avatar {
  background-color: var(--accent-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 50%;
}

.msg-content { 
  flex: 1; 
  min-width: 0;
  color: var(--text-main);
  white-space: pre-wrap; 
  word-wrap: break-word;
}


/* Markdown Styles inside msg-content */
.msg-content p { margin-bottom: 12px; }
.msg-content p:last-child { margin-bottom: 0; }
.msg-content ul, .msg-content ol { margin-bottom: 12px; padding-left: 20px; }
.msg-content li { margin-bottom: 4px; }
.msg-content h1, .msg-content h2, .msg-content h3 { margin-bottom: 10px; margin-top: 16px; font-weight: 600; }
.msg-content pre {
  position: relative;
  background: #0d0d0d; color: #fff; padding: 36px 16px 16px 16px; border-radius: 8px;
  overflow-x: auto; margin: 12px 0; font-family: monospace; font-size: 0.9rem;
}
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 0.75rem;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: background 0.2s;
}
.copy-btn:hover {
  background: rgba(255, 255, 255, 0.25);
}
.msg-content code { 
  background: var(--input-bg); 
  padding: 2px 6px; 
  border-radius: 4px; 
  font-family: monospace; 
  font-size: 0.9em; 
  color: #eb5757;
}
.msg-content pre code { background: transparent; padding: 0; color: inherit; }

.error { color: #eb5757; font-weight: 500; }

.streaming-cursor {
  display: inline-block;
  width: 0.5ch;
  height: 1.1em;
  margin-left: 2px;
  vertical-align: text-bottom;
  background-color: var(--text-main);
  border-radius: 1px;
  animation: blinkCursor 1s steps(1) infinite;
}

@keyframes blinkCursor {
  0%, 45% { opacity: 1; }
  46%, 100% { opacity: 0; }
}

.scroll-to-bottom-btn {
  position: fixed;
  right: 28px;
  bottom: 112px;
  width: 40px;
  height: 40px;
  border: 1px solid var(--input-border);
  border-radius: 999px;
  background: var(--chat-bot-bg);
  color: var(--text-main);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
  z-index: 20;
}

.scroll-to-bottom-btn.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.scroll-to-bottom-btn:hover {
  background: var(--input-bg);
}

/* Input */
.input-wrapper {
  padding: 16px 20px;
  background: linear-gradient(180deg, transparent, var(--bg-color) 30%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  bottom: 0;
  width: 100%;
}

.input-box {
  width: 100%;
  max-width: 800px;
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 16px;
  display: flex;
  align-items: flex-end;
  padding: 8px 12px;
  position: relative;
  transition: background 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow);
}
.input-box:focus-within {
  box-shadow: 0 0 0 1px var(--accent-color);
  background-color: var(--chat-bot-bg);
}

textarea {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--text-main);
  font-size: 1rem;
  resize: none;
  outline: none;
  max-height: 200px;
  padding: 8px;
  line-height: 1.5;
}
textarea::placeholder { color: var(--text-muted); }

#sendBtn {
  background: var(--text-main);
  color: var(--bg-color);
  border: none;
  border-radius: 10px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: opacity 0.2s;
  flex-shrink: 0;
  margin-bottom: 4px;
}
#sendBtn:hover { opacity: 0.8; }
#sendBtn svg { width: 14px; height: 14px; }
#sendBtn.disabled { opacity: 0.3; cursor: not-allowed; }

.disclaimer {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 10px;
  text-align: center;
}

/* Loader */
.loading-box { 
  display: flex; 
  align-items: center; 
  height: 24px; 
  gap: 12px; 
  color: var(--text-muted); 
  font-weight: 500;
  font-size: 0.9rem;
}
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--input-border);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 768px) {
  header { padding: 10px 15px; }
  .logo-container h1 { font-size: 1rem; }
  .chat-container { padding: 10px; padding-bottom: 20px; }
  .message-wrapper { padding: 15px 0; }
  .message { padding: 0 10px; gap: 10px; font-size: 0.95rem; max-width: 100%; }
  .avatar { width: 28px; height: 28px; }
  .input-wrapper { padding: 10px; background: var(--bg-color); }
  .input-box { border-radius: 12px; padding: 6px 10px; }
  textarea { padding: 4px; font-size: 0.95rem; }
  #sendBtn { width: 30px; height: 30px; margin-bottom: 2px; }
  .disclaimer { font-size: 0.65rem; margin-top: 5px; }
  .msg-content pre { padding: 10px; font-size: 0.85rem; }
  .scroll-to-bottom-btn {
    right: 14px;
    bottom: 88px;
    width: 36px;
    height: 36px;
  }
}