:root {
  color-scheme: light;
  --bg: #f3f4f0;
  --surface: #ffffff;
  --line: #d8ddd2;
  --text: #1c211b;
  --muted: #66705f;
  --accent: #146c5d;
  --accent-strong: #0c4a3f;
  --danger: #a13b2b;
  --assistant: #ffffff;
  --user: #d9f2dd;
  --sidebar-width: 300px;
  --sidebar-padding: 18px;
  --sidebar-toggle-left: 12px;
  --sidebar-toggle-width: 52px;
  --control-gap: 8px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
textarea {
  font: inherit;
}

button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

button:disabled {
  cursor: progress;
  opacity: 0.65;
}

.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

.primary:hover {
  background: var(--accent-strong);
}

.ghost,
.ghost-link {
  padding: 8px 12px;
  background: transparent;
  color: var(--accent-strong);
  text-decoration: none;
}

.muted {
  color: var(--muted);
}

.toc-app {
  min-height: 100vh;
}

.auth-view {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.auth-panel {
  width: min(420px, 100%);
  display: grid;
  gap: 18px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

h1,
p {
  margin: 0;
}

.auth-panel h1,
.topbar h1,
.chat-header h1 {
  font-size: 22px;
  letter-spacing: 0;
}

.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.auth-tabs button.active {
  border-color: var(--accent);
  box-shadow: inset 0 -3px 0 var(--accent);
  font-weight: 700;
}

.auth-form {
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
  color: var(--text);
  outline: none;
}

input {
  min-height: 40px;
  padding: 8px 10px;
}

textarea {
  resize: none;
  min-height: 42px;
  max-height: 180px;
  padding: 10px 12px;
}

input:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(20, 108, 93, 0.12);
}

.main-view {
  position: relative;
  min-height: 100vh;
  min-width: 620px;
  display: grid;
  grid-template-columns: minmax(240px, var(--sidebar-width)) minmax(0, 1fr);
  transition: grid-template-columns 160ms ease;
}

.main-view.sidebar-collapsed {
  min-width: 360px;
  grid-template-columns: 0 minmax(0, 1fr);
}

.toc-sidebar {
  width: 100%;
  min-width: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 14px;
  border-right: 1px solid var(--line);
  background: #eef1ea;
  padding: var(--sidebar-padding);
  overflow: hidden;
  transition:
    padding 160ms ease,
    border-color 160ms ease,
    visibility 160ms ease;
}

.main-view.sidebar-collapsed .toc-sidebar {
  visibility: hidden;
  pointer-events: none;
  border-right-color: transparent;
  padding-right: 0;
  padding-left: 0;
}

.sidebar-toggle {
  position: fixed;
  top: var(--sidebar-padding);
  left: var(--sidebar-toggle-left);
  z-index: 20;
  width: var(--sidebar-toggle-width);
  min-height: 34px;
  padding: 6px 10px;
  border-color: var(--accent);
  background: #fbfcfa;
  color: var(--accent-strong);
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 6px 18px rgba(28, 33, 27, 0.14);
}

.sidebar-top-row {
  min-height: 34px;
  display: flex;
  align-items: center;
  gap: var(--control-gap);
  padding-left: calc(var(--sidebar-toggle-left) + var(--sidebar-toggle-width) + var(--control-gap) - var(--sidebar-padding));
}

.sidebar-account-row {
  display: flex;
  align-items: center;
  gap: var(--control-gap);
  flex-wrap: wrap;
}

.account-line {
  flex: 1 1 auto;
  min-width: 112px;
  color: var(--muted);
  font-size: 13px;
  overflow-wrap: anywhere;
}

.sidebar-actions,
.settings-actions {
  display: flex;
  gap: var(--control-gap);
  flex-wrap: wrap;
}

.sidebar-actions .ghost,
.settings-actions .ghost,
.settings-actions .primary,
.sidebar-top-row .ghost {
  min-height: 34px;
  padding: 6px 10px;
  font-size: 13px;
}

.account-settings-panel {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
}

.toc-history-panel {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 10px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.history-header h2 {
  margin: 0;
  font-size: 15px;
  letter-spacing: 0;
}

.history-header .ghost {
  min-height: 34px;
  padding: 6px 10px;
  font-size: 13px;
}

.toc-conversation-list {
  min-height: 0;
  display: grid;
  align-content: start;
  gap: 6px;
  overflow-y: auto;
}

.history-empty {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.conversation-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px;
}

.conversation-open {
  min-width: 0;
  display: grid;
  gap: 2px;
  justify-items: start;
  padding: 8px;
  text-align: left;
  background: #fbfcfa;
}

.conversation-item.active .conversation-open,
.conversation-open:hover {
  border-color: var(--accent);
}

.conversation-title,
.conversation-meta {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conversation-title {
  font-size: 13px;
  font-weight: 700;
}

.conversation-meta {
  color: var(--muted);
  font-size: 11px;
}

.conversation-delete {
  width: 34px;
  min-height: 34px;
  padding: 0;
  color: var(--danger);
  background: #fff7f4;
}

.admin-link {
  justify-self: start;
}

.sidebar-status {
  min-height: 18px;
  font-size: 12px;
}

.toc-content {
  min-width: 0;
  min-height: 100vh;
}

.persona-view {
  min-height: 100vh;
  align-content: center;
  justify-items: stretch;
  max-width: 960px;
  margin: 0 auto;
  display: grid;
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.topbar {
  width: 100%;
  margin-bottom: 20px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.persona-grid {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 14px;
}

.persona-card {
  min-height: 132px;
  display: grid;
  align-content: center;
  justify-items: start;
  gap: 8px;
  padding: 22px;
  text-align: left;
  background: var(--surface);
}

.persona-card:hover {
  border-color: var(--accent);
}

.persona-card span {
  font-size: 22px;
  font-weight: 800;
}

.persona-card small {
  color: var(--muted);
}

.chat-view {
  height: 100vh;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto auto;
  gap: 12px;
  max-width: 980px;
  margin: 0 auto;
  padding: 16px;
}

.chat-header {
  display: grid;
  justify-items: center;
  text-align: center;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.chat-title {
  display: grid;
  gap: 2px;
  justify-items: center;
}

.messages {
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  padding: 4px 0 10px;
}

.message {
  max-width: min(760px, 88%);
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

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

.message.assistant {
  align-self: flex-start;
  background: var(--assistant);
}

.message.system {
  align-self: center;
  max-width: 100%;
  background: transparent;
  color: var(--muted);
  border-style: dashed;
  font-size: 13px;
}

.message-group {
  max-width: min(760px, 88%);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.message-group.user {
  align-self: flex-end;
  align-items: flex-end;
}

.message-group.assistant {
  align-self: flex-start;
  align-items: flex-start;
}

.message-group .message {
  max-width: 100%;
}

.message-actions {
  display: flex;
  gap: 6px;
  opacity: 0;
  transition: opacity 0.12s;
}

.message-group:hover .message-actions,
.message-group:focus-within .message-actions {
  opacity: 1;
}

.message-actions button {
  min-height: 24px;
  padding: 2px 9px;
  border-color: transparent;
  border-radius: 12px;
  background: transparent;
  color: var(--muted);
  font-size: 11px;
}

.message-actions button:hover:not(:disabled) {
  border-color: var(--line);
  background: var(--surface);
  color: var(--accent);
}

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

.composer .primary {
  min-width: 82px;
}

.chat-status {
  min-height: 20px;
  font-size: 12px;
}

.error {
  color: var(--danger);
}

@media (max-width: 720px) {
  .persona-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    align-items: flex-start;
  }

  .message {
    max-width: 94%;
  }

  .message-group {
    max-width: 94%;
  }
}