:root {
  color-scheme: light;
  --app-height: 100dvh;
  --bg: #f5f7f4;
  --panel: #ffffff;
  --ink: #202322;
  --muted: #6b716e;
  --line: #dfe4df;
  --accent: #116b5f;
  --accent-dark: #0d5249;
  --warn: #a13a22;
  --sidebar: #e9eee9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: var(--app-height);
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

html {
  height: 100%;
  overflow: hidden;
}

button,
input,
textarea {
  font: inherit;
}

.app {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  height: var(--app-height);
  min-height: 0;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 18px;
  background: var(--sidebar);
  border-right: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.brand-mark {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
}

.primary-button,
.send-button,
.icon-button,
.mode-button {
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}

.primary-button {
  min-height: 42px;
  padding: 0 14px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

.primary-button:hover,
.send-button:hover {
  background: var(--accent-dark);
}

.conversation-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow: auto;
}

.conversation-item {
  padding: 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  text-align: left;
}

.conversation-item:hover,
.conversation-item.active {
  border-color: var(--line);
  background: #fff;
}

.chat-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-width: 0;
  min-height: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(10px);
}

.topbar h1 {
  margin: 0;
  font-size: 20px;
}

.topbar p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.icon-button {
  min-width: 72px;
  min-height: 38px;
  background: #eef2ee;
  color: var(--ink);
}

.login-view {
  display: grid;
  place-items: center;
  min-height: 0;
  padding: 24px;
}

.login-box {
  display: grid;
  width: min(360px, 100%);
  gap: 12px;
}

.login-box h2 {
  margin: 0 0 8px;
}

.login-box input {
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.error {
  min-height: 20px;
  margin: 0;
  color: var(--warn);
}

.chat-view {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-height: 0;
}

.hidden {
  display: none;
}

.messages {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 0;
  padding: 24px;
  overflow: auto;
  overscroll-behavior: contain;
}

.message {
  max-width: min(780px, 88%);
  padding: 14px 16px;
  border-radius: 8px;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.message.user {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
}

.message.assistant {
  align-self: flex-start;
  background: var(--panel);
  border: 1px solid var(--line);
  white-space: normal;
}

.message.assistant p,
.message.assistant ul,
.message.assistant ol,
.message.assistant h3,
.message.assistant h4,
.message.assistant h5 {
  margin: 0;
}

.message.assistant p + p,
.message.assistant p + ul,
.message.assistant p + ol,
.message.assistant ul + p,
.message.assistant ol + p,
.message.assistant h3 + p,
.message.assistant h4 + p,
.message.assistant h5 + p {
  margin-top: 12px;
}

.message.assistant ul,
.message.assistant ol {
  padding-left: 22px;
}

.message.assistant li + li {
  margin-top: 4px;
}

.message.assistant code {
  padding: 2px 5px;
  border-radius: 5px;
  background: #eef2ee;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.94em;
}

.message.assistant a {
  color: var(--accent-dark);
  font-weight: 700;
}

.composer {
  display: grid;
  gap: 10px;
  padding: 14px 24px 22px;
  border-top: 1px solid var(--line);
  background: rgba(245, 247, 244, 0.94);
  padding-bottom: max(22px, env(safe-area-inset-bottom));
}

.mode-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.mode-button {
  min-height: 32px;
  padding: 0 12px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
}

.mode-button.active {
  border-color: var(--accent);
  background: #e1f0ec;
  color: var(--accent-dark);
  font-weight: 700;
}

.input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 44px;
  gap: 10px;
  align-items: end;
}

textarea {
  width: 100%;
  max-height: 180px;
  min-height: 46px;
  resize: none;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.send-button {
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: #fff;
  font-size: 22px;
  line-height: 1;
}

@media (max-width: 780px) {
  .app {
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: none;
  }

  .topbar,
  .messages,
  .composer {
    padding-left: 14px;
    padding-right: 14px;
  }

  .topbar {
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .message {
    max-width: 96%;
  }
}