*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --sidebar-w: 240px;
  --bg:        #0f0f10;
  --bg2:       #1a1a1e;
  --bg3:       #222228;
  --border:    rgba(255,255,255,0.07);
  --border2:   rgba(255,255,255,0.12);
  --text:      #ececf1;
  --text-muted:#8888a8;
  --text-dim:  #555570;
  --accent:    #20b2aa;
  --accent2:   #4299e1;
  --green:     #22c55e;
  --input-bg:  #1e1e24;
  --input-h:   rgba(255,255,255,0.04);
}

/* LIGHT THEME */
body.light {
  --bg:        #f5f5f7;
  --bg2:       #ffffff;
  --bg3:       #e8e8ed;
  --border:    rgba(0,0,0,0.08);
  --border2:   rgba(0,0,0,0.15);
  --text:      #1a1a2e;
  --text-muted:#555570;
  --text-dim:  #9999b0;
  --accent:    #0e9e96;
  --accent2:   #2b7de9;
  --input-bg:  #ffffff;
  --input-h:   rgba(0,0,0,0.03);
}

/* THEME TOGGLE BUTTON */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: none;
  border: 1px solid var(--border2);
  color: var(--text-muted);
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
  flex-shrink: 0;
}
.theme-toggle:hover {
  background: var(--input-h);
  color: var(--text);
}
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
body.light .theme-toggle .icon-sun { display: block; }
body.light .theme-toggle .icon-moon { display: none; }

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* SCROLLBAR */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 4px; }

/* SIDEBAR */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 1.25rem 0;
  height: 100vh;
  overflow: hidden;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding: .25rem 1.2rem 1.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -.01em;
  color: var(--text);
}

.sidebar-logo-icon {
  font-size: 1.3rem;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sidebar-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 .6rem;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: .65rem;
  padding: .6rem .8rem;
  border-radius: 10px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: .88rem;
  font-weight: 500;
  transition: background .15s, color .15s;
}

.sidebar-item svg { opacity: .7; flex-shrink: 0; }
.sidebar-item:hover { background: rgba(255,255,255,0.04); color: var(--text); }
.sidebar-item:hover svg { opacity: 1; }
.sidebar-item.active { background: rgba(32,178,170,.1); color: var(--accent); }
.sidebar-item.active svg { opacity: 1; color: var(--accent); }

.sidebar-bottom {
  padding: .75rem 1.2rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

.sidebar-badge {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .75rem;
  color: var(--text-muted);
}

.status-dot {
  width: 7px; height: 7px;
  background: var(--green);
  border-radius: 50%;
  box-shadow: 0 0 5px var(--green);
  animation: pulse 2s ease-in-out infinite;
  flex-shrink: 0;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.35} }

.sidebar-github {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .78rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color .15s;
}
.sidebar-github:hover { color: var(--text); }

/* MAIN */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  position: relative;
}

/* HOME VIEW */
.home-view {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  padding: 4rem 2rem 2rem;
  transition: opacity .3s, transform .3s;
}

.home-view.hidden {
  opacity: 0;
  pointer-events: none;
  position: absolute;
  top: 0; left: 0; right: 0;
  transform: translateY(-20px);
}

.home-hero {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .6rem;
}

.home-logo {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -.03em;
  display: flex;
  align-items: center;
  gap: .55rem;
  color: var(--text);
}

.home-logo-icon {
  font-size: clamp(2rem, 4vw, 2.8rem);
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.home-tagline {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* CHIPS */
.chips-row {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  justify-content: center;
  max-width: 640px;
}

.chip {
  padding: .5rem 1rem;
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: 999px;
  color: var(--text-muted);
  font-size: .82rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
  white-space: nowrap;
}
.chip:hover {
  background: var(--bg3);
  border-color: rgba(32,178,170,.35);
  color: var(--text);
}

/* CHAT MESSAGES */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 2rem 0;
  display: none;
  flex-direction: column;
  gap: 1.5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
}

.chat-messages.visible {
  display: flex;
}

.message {
  display: flex;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 0 2rem;
}

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

.message-bubble {
  padding: .75rem 1.15rem;
  border-radius: 18px;
  font-size: .93rem;
  line-height: 1.6;
  max-width: 75%;
  word-break: break-word;
}

.bot-message .message-bubble {
  background: transparent;
  color: var(--text);
  max-width: 100%;
  padding: 0;
  border-radius: 0;
}

.bot-message {
  flex-direction: column;
  gap: .5rem;
}

.bot-label {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .78rem;
  color: var(--text-muted);
  font-weight: 600;
}

.bot-avatar {
  width: 22px; height: 22px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .7rem;
  color: #fff;
  font-weight: 700;
}

.user-message .message-bubble {
  background: var(--bg3);
  border: 1px solid var(--border2);
  color: var(--text);
  border-bottom-right-radius: 6px;
}

/* typing */
.typing-bubble {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: .6rem 0;
}
.typing-dot {
  width: 7px; height: 7px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: typebounce .9s ease-in-out infinite;
}
.typing-dot:nth-child(2){animation-delay:.15s}
.typing-dot:nth-child(3){animation-delay:.3s}
@keyframes typebounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-5px)}}

.message-bubble code {
  background: var(--bg3);
  border: 1px solid var(--border);
  padding: .1em .35em;
  border-radius: 4px;
  font-size: .88em;
  font-family: 'Fira Code', 'Cascadia Code', monospace;
}

/* ── Markdown rendered content ──────────────────── */
.message-bubble h1, .message-bubble h2, .message-bubble h3,
.message-bubble h4, .message-bubble h5 {
  margin: .9em 0 .3em;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}
.message-bubble h1 { font-size: 1.25em; }
.message-bubble h2 { font-size: 1.1em; }
.message-bubble h3 { font-size: 1em; }

.message-bubble p { margin: .45em 0; }

.message-bubble ul, .message-bubble ol {
  margin: .4em 0 .4em 1.2em;
  padding: 0;
}
.message-bubble li { margin: .2em 0; }

.message-bubble table {
  border-collapse: collapse;
  width: 100%;
  margin: .75em 0;
  font-size: .9em;
  overflow-x: auto;
  display: block;
}
.message-bubble th {
  background: var(--bg3);
  color: var(--text);
  font-weight: 600;
  text-align: left;
  padding: .5em .75em;
  border: 1px solid var(--border);
}
.message-bubble td {
  padding: .45em .75em;
  border: 1px solid var(--border);
  vertical-align: top;
  color: var(--text-muted);
}
.message-bubble tr:nth-child(even) td {
  background: rgba(255,255,255,.02);
}

.message-bubble pre {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .75em 1em;
  overflow-x: auto;
  font-size: .88em;
  margin: .6em 0;
}
.message-bubble pre code {
  background: none;
  border: none;
  padding: 0;
}

.message-bubble hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: .8em 0;
}

.message-bubble strong { color: var(--text); font-weight: 600; }
.message-bubble em { font-style: italic; }

/* INPUT DOCK */
.input-dock {
  padding: 1rem 2rem 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  background: var(--bg);
  flex-shrink: 0;
}

.input-wrap {
  width: 100%;
  max-width: 720px;
  background: var(--input-bg);
  border: 1px solid var(--border2);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  transition: border-color .2s, box-shadow .2s;
}

.input-wrap:focus-within {
  border-color: rgba(32,178,170,.5);
  box-shadow: 0 0 0 3px rgba(32,178,170,.08);
}

.main-input {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-family: inherit;
  font-size: .95rem;
  line-height: 1.5;
  padding: 1rem 1.25rem .5rem;
  resize: none;
  max-height: 200px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
}
.main-input::placeholder { color: var(--text-dim); }

.input-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .5rem .75rem .65rem 1rem;
  gap: .5rem;
}

.input-left-actions {
  display: flex;
  align-items: center;
  gap: .6rem;
  flex-wrap: wrap;
}

.model-select {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 8px;
  padding: .22rem .55rem;
  font-size: .76rem;
  font-family: inherit;
  cursor: pointer;
  outline: none;
  transition: border-color .15s, color .15s;
}
.model-select:hover, .model-select:focus {
  border-color: var(--border2);
  color: var(--text);
}
.model-select option { background: var(--bg2); }

.agent-toggle {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .76rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .22rem .6rem;
  transition: border-color .15s, color .15s;
}
.agent-toggle:hover { border-color: var(--border2); color: var(--text); }
.agent-toggle input {
  width: 13px; height: 13px;
  accent-color: var(--accent);
  cursor: pointer;
}
.agent-toggle input:disabled { opacity: .4; cursor: not-allowed; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-size: .76rem;
  font-family: inherit;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 8px;
  padding: .22rem .6rem;
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
}
.icon-btn:hover {
  background: rgba(255,255,255,0.04);
  border-color: var(--border2);
  color: var(--text);
}

.send-btn {
  width: 34px; height: 34px;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background .15s, transform .15s, opacity .15s;
}
.send-btn:hover:not(:disabled) { background: var(--accent2); transform: scale(1.05); }
.send-btn:disabled { opacity: .35; cursor: default; }

.input-disclaimer {
  font-size: .72rem;
  color: var(--text-dim);
  text-align: center;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  :root { --sidebar-w: 220px; }
}

@media (max-width: 600px) {
  .sidebar { display: none; }
  .input-dock { padding: .75rem 1rem 1rem; }
  .message { padding: 0 1rem; }
}