:root {
  color-scheme: light;
  --bg: #f6f5f1;
  --panel: #ffffff;
  --panel-strong: #fcfbf8;
  --text: #171717;
  --muted: #69665f;
  --line: #dfddd5;
  --line-strong: #cbc7bc;
  --accent: #0f7a5f;
  --accent-strong: #0b5f4a;
  --accent-soft: #e4f3ee;
  --danger: #a23b32;
  --shadow: 0 18px 60px rgba(37, 34, 29, 0.12);
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

body {
  background: var(--bg);
  color: var(--text);
}

button,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  display: grid;
  grid-template-columns: 292px minmax(0, 1fr);
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.sidebar {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 14px;
  border-right: 1px solid var(--line);
  background: #efede7;
  padding: 18px 14px;
  overflow: hidden;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  padding: 0 4px;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  place-items: center;
  border: 1px solid #bfcac3;
  border-radius: 8px;
  background: #dcebe5;
  color: #0b5f4a;
  font-size: 0.8rem;
  font-weight: 800;
}

.brand-name {
  font-size: 0.98rem;
  font-weight: 750;
}

.brand-subtitle {
  color: var(--muted);
  font-size: 0.78rem;
}

.new-chat-button,
.ghost-button,
.send-button,
.stop-button,
.sidebar-toggle {
  min-height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
  font-weight: 650;
}

.new-chat-button {
  width: 100%;
}

.new-chat-button:hover,
.ghost-button:hover,
.sidebar-toggle:hover {
  border-color: #aba69a;
  background: #f8f7f3;
}

.conversation-list {
  display: flex;
  min-height: 0;
  flex: 1;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
  padding-right: 2px;
}

.conversation-button {
  display: flex;
  min-height: 44px;
  width: 100%;
  align-items: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  padding: 8px 12px;
  color: var(--muted);
  text-align: left;
  transition: all 0.2s;
}

.conversation-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-radius: var(--radius);
  padding: 0;
  transition: all 0.2s;
  position: relative;
  cursor: pointer;
}

.conversation-item.active {
  background: var(--panel-strong);
}

.conversation-click-area {
  flex: 1;
  padding: 12px;
  overflow: hidden;
}

.conversation-menu-wrapper {
  position: relative;
  padding-right: 8px;
}

.dots-button {
  background: transparent;
  border: none;
  color: var(--muted);
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  font-weight: bold;
  opacity: 0;
  transition: opacity 0.2s;
}

.conversation-item:hover .dots-button {
  opacity: 1;
}

.dots-button:hover {
  color: var(--text);
  background: rgba(255,255,255,0.1);
}

.conversation-dropdown {
  position: absolute;
  right: 0;
  top: 100%;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  z-index: 100;
  display: flex;
  flex-direction: column;
  min-width: 120px;
  overflow: hidden;
}

.conversation-dropdown button {
  background: transparent;
  border: none;
  color: var(--text);
  padding: 10px 12px;
  text-align: left;
  cursor: pointer;
  font-size: 0.85rem;
}

.conversation-dropdown button:hover {
  background: var(--panel-strong);
}

.conversation-title {
  overflow: hidden;
  color: #24221f;
  font-size: 0.92rem;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conversation-date {
  align-self: end;
  color: var(--muted);
  font-size: 0.72rem;
}

.chat-panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  max-width: 100%;
  height: 100%;
  background: var(--panel);
}

.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 62px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  padding: 0 22px;
}

.sidebar-toggle {
  display: none;
  padding: 0 12px;
}

.model-control {
  display: flex;
  align-items: center;
  gap: 10px;
}

.model-control label {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.model-control select {
  min-width: 176px;
  height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #fff;
  color: var(--text);
  padding: 0 10px;
}

.topbar-actions {
  display: flex;
  gap: 8px;
  margin-left: auto;
}

.ghost-button {
  padding: 0 12px;
}

.ghost-button.danger {
  color: var(--danger);
}

.status-strip {
  border-bottom: 1px solid #ead6d3;
  background: #fff0ee;
  color: #7a2c25;
  padding: 10px 22px;
  font-size: 0.9rem;
}

.messages {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 24px clamp(18px, 5vw, 72px);
  scroll-behavior: smooth;
}

.empty-state {
  display: grid;
  min-height: 100%;
  place-items: center;
  text-align: center;
}

.empty-state h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 760;
  letter-spacing: 0;
}

.empty-state p {
  max-width: 520px;
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
}

.message {
  display: grid;
  grid-template-columns: 36px minmax(0, 780px);
  gap: 14px;
  margin: 0 auto 26px;
  width: min(100%, 860px);
}

.message-avatar {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 8px;
  background: #ece9e0;
  color: #44413b;
  font-size: 0.78rem;
  font-weight: 800;
}

.message.assistant .message-avatar {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.message-body {
  min-width: 0;
}

.message-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 28px;
  margin-bottom: 4px;
}

.message-author {
  font-size: 0.86rem;
  font-weight: 750;
}

.copy-button {
  margin-left: auto;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 0.78rem;
}

.copy-button:hover {
  color: var(--text);
}

.message-content {
  overflow-wrap: break-word;
  word-break: break-word;
  word-wrap: break-word;
  font-size: 1rem;
  line-height: 1.65;
  min-width: 0;
}

.message-content p {
  margin: 0 0 12px;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content a {
  color: var(--accent-strong);
}

.message-content code {
  border: 1px solid #ddd9ce;
  border-radius: 5px;
  background: #f4f2ec;
  padding: 0.12em 0.32em;
  font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-size: 0.92em;
}

.message-content pre {
  overflow-x: auto;
  border: 1px solid #2f3430;
  border-radius: var(--radius);
  background: #151816;
  color: #f3f4ee;
  padding: 14px;
}

.message-content pre code {
  border: 0;
  background: transparent;
  color: inherit;
  padding: 0;
}

.message-content ul,
.message-content ol {
  margin: 0 0 12px;
  padding-left: 1.35rem;
}

.message-content blockquote {
  margin: 0 0 12px;
  border-left: 3px solid var(--line-strong);
  padding-left: 12px;
  color: #4d4a44;
}

.typing-caret::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 1em;
  margin-left: 2px;
  background: var(--accent);
  transform: translateY(2px);
  animation: blink 1s steps(2, start) infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

.composer-wrap {
  border-top: 1px solid var(--line);
  background: var(--panel-strong);
  padding: 14px clamp(18px, 5vw, 72px) 16px;
}

.composer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 8px;
  width: min(100%, 860px);
  margin: 0 auto;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 8px;
  box-shadow: var(--shadow);
}

.composer textarea {
  min-height: 42px;
  max-height: 180px;
  resize: none;
  border: 0;
  outline: 0;
  padding: 10px 8px;
  color: var(--text);
  line-height: 1.45;
}

.send-button,
.stop-button {
  align-self: end;
  min-width: 72px;
  border-color: transparent;
  background: var(--accent);
  color: #ffffff;
  padding: 0 14px;
}

.send-button:hover,
.stop-button:hover {
  background: var(--accent-strong);
}

.send-button:disabled {
  cursor: not-allowed;
  background: #8ca79f;
}

.stop-button {
  background: #524f49;
}

.composer-note {
  width: min(100%, 860px);
  margin: 8px auto 0;
  color: var(--muted);
  font-size: 0.78rem;
  text-align: center;
}

@media (max-width: 860px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    z-index: 10;
    inset: 0 auto 0 0;
    width: min(86vw, 320px);
    transform: translateX(-100%);
    transition: transform 160ms ease;
    box-shadow: var(--shadow);
  }

  body.sidebar-open .sidebar {
    transform: translateX(0);
  }

  .sidebar-toggle {
    display: inline-flex;
    align-items: center;
  }

  .topbar {
    gap: 10px;
    padding: 0 12px;
  }

  .model-control {
    min-width: 0;
    flex: 1;
  }

  .model-control select {
    min-width: 0;
    width: 100%;
  }

  .topbar-actions {
    display: none;
  }

  .messages {
    padding: 18px 14px;
  }

  .message {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 10px;
  }

  .message-avatar {
    width: 32px;
    height: 32px;
  }

  .composer-wrap {
    padding: 12px 12px 14px;
  }

  .composer {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .stop-button {
    grid-column: 2;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #212121;
    --panel: #171717;
    --panel-strong: #2f2f2f;
    --text: #ececec;
    --muted: #b4b4b4;
    --line: #424242;
    --line-strong: #555555;
    --accent: #10a37f;
    --accent-strong: #0e8c6d;
    --accent-soft: #2a2b32;
    --danger: #ef4444;
    --shadow: 0 18px 60px rgba(0, 0, 0, 0.4);
  }

  body { background: var(--bg); }
  .chat-panel { background: var(--bg); }
  .sidebar { background: var(--panel); border-right: none; }
  .sidebar-profile:hover { background: var(--panel-strong); }
  .brand-mark { border: none; background: #fff; color: #000; border-radius: 50%; width: 32px; height: 32px; font-size: 0.7rem; }
  .brand-name { font-weight: 600; letter-spacing: 0.5px; }
  .new-chat-button { border: none; background: var(--bg); }
  .new-chat-button:hover, .ghost-button:hover, .sidebar-toggle:hover { border-color: transparent; background: var(--panel-strong); }
  .conversation-item:hover { background: var(--panel-strong); }
  .conversation-item.active { border-color: transparent; background: var(--panel-strong); box-shadow: none; }
  .conversation-title { color: #ececec; font-weight: 500; font-size: 0.9rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .topbar { background: transparent; border-bottom: none; }
  .profile-dropdown button:hover { background: rgba(255, 255, 255, 0.1) !important; }
  .status-strip { border-color: #5c2b27; background: #3d1b18; color: #f5a39d; }
  
  .message-avatar { background: #10a37f; color: #fff; border-radius: 4px; font-size: 11px; }
  .message.user .message-avatar { background: #444; }
  .message.user .message-body { background: var(--panel-strong); padding: 12px 16px; border-radius: 16px; display: inline-block; max-width: 80%; }
  .message.user .message-meta { display: none; }
  .message.assistant .message-body { margin-top: 6px; }
  
  .message-content code { border-color: #333; background: #2f2f2f; color: #ececec; }
  .message-content pre { border-color: #333; background: #0d0d0d; color: #ececec; border-radius: 8px; }
  .message-content blockquote { color: #b4b4b4; border-left-color: #424242; }
  
  .composer-wrap { background: transparent; border-top: none; }
  .composer { border: 1px solid var(--line); border-radius: 1rem; background: var(--panel-strong); box-shadow: 0 0 15px rgba(0,0,0,0.1); padding: 8px; }
  .composer textarea { background: transparent; padding-left: 12px; }
  .send-button { background: var(--text); color: var(--bg); border-radius: 0.5rem; padding: 0 14px; }
  .send-button:hover { background: #d4d4d4; }
  .send-button:disabled { background: var(--bg); color: #666; }
  .stop-button { background: var(--panel-strong); }
}

/* Login Screen Styles */
.login-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--panel);
  z-index: 1000;
}

.login-box {
  background: var(--panel-strong);
  padding: 40px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  text-align: center;
  max-width: 400px;
  width: 90%;
  box-shadow: var(--shadow);
}

.login-box h2 {
  margin: 16px 0 8px;
  color: var(--text);
}

.login-box p {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.google-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  padding: 12px;
  background: white;
  color: #3c4043;
  border: 1px solid #dadce0;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.google-btn:hover {
  background: #f8f9fa;
}

.login-box .brand-mark {
  margin: 0 auto;
  width: 60px;
  height: 60px;
  font-size: 1.5rem;
}

.profile-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.profile-form input,
.profile-form select {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
  font-size: 14px;
}

.profile-form input:focus,
.profile-form select:focus {
  outline: 2px solid var(--accent);
  border-color: transparent;
}