/* ============================================================
 * LucidWrite — design tokens
 * 对齐 DESIGN.md §2 两层 token（Primitive + Semantic）
 * 业务组件只允许引用 Semantic 层（--lp-*）
 * ============================================================ */

:root {
  /* L1 Primitive — 仅本文件内部使用，禁止业务组件直接引用 */
  --color-white: #ffffff;
  --color-gray-50: #fafafa;
  --color-gray-100: #f8f8f8;
  --color-gray-150: #f0f0f0;
  --color-gray-200: #eeeeee;
  --color-gray-300: #d1d5db;
  --color-gray-450: #767676;
  --color-gray-500: #999999;
  --color-gray-600: #666666;
  --color-gray-700: #171717;
  --color-gray-900: #1a1d2e;
  --color-black-soft: #191919;

  --color-black-a4: rgba(25, 25, 25, 0.04);
  --color-black-a5: rgba(25, 25, 25, 0.05);
  --color-black-a6: rgba(25, 25, 25, 0.06);
  --color-black-a8: rgba(25, 25, 25, 0.08);

  --color-red-500: #f53f3f;
  --color-red-400: #f76560;
  --color-red-700: #cb272d;
  --color-red-a10: rgba(245, 63, 63, 0.10);

  --radius-6: 6px;
  --radius-8: 8px;
  --radius-12: 12px;
  --radius-16: 16px;
  --radius-20: 20px;
  --radius-pill: 9999px;

  /* L2 Semantic — 业务组件只用这一层 */
  --background: var(--color-white);
  --foreground: var(--color-gray-700);

  --lp-bg: var(--color-gray-100);
  --lp-bg-dark: #0e0e0e;

  --lp-text-strong: var(--color-black-soft);
  --lp-text-primary: var(--color-gray-900);
  --lp-text-muted: var(--color-gray-600);
  --lp-text-subtle: var(--color-gray-450);
  --lp-text-decorative: var(--color-gray-500);

  --lp-accent: var(--color-black-soft);
  --lp-accent-soft: var(--color-black-a6);

  --lp-error: var(--color-red-500);
  --lp-error-hover: var(--color-red-400);
  --lp-error-active: var(--color-red-700);
  --lp-error-soft: var(--color-red-a10);

  --lp-border-subtle: var(--color-gray-200);
  --lp-border-divider: var(--color-gray-150);
  --lp-border-strong: var(--color-gray-300);
  --lp-surface-hover: var(--color-black-a4);
  --lp-surface-active: var(--color-black-a6);

  --lp-bubble-bg: var(--color-black-a5);

  --lp-radius-comfortable: var(--radius-6);
  --lp-radius-card: var(--radius-8);
  --lp-radius-panel: var(--radius-12);
  --lp-radius-chat: var(--radius-16);
  --lp-radius-large: var(--radius-20);
  --lp-radius-pill: var(--radius-pill);
  --lp-opacity-disabled: 0.40;
  --lp-opacity-loading: 0.70;

  /* 系统字体栈，无 webfont */
  --font-app: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    system-ui, "Segoe UI", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  font-family: var(--font-app);
  color: var(--foreground);
}

/* prefers-reduced-motion — DESIGN.md §9.4 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

body {
  margin: 0;
  color: var(--foreground);
  background: var(--background);
  font-family: var(--font-app);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button,
input,
textarea {
  font-family: var(--font-app);
}

button {
  cursor: pointer;
}

/* ============================================================
 * App shell — 三栏：目录 / 工作区 / 聊天
 * ============================================================ */

.app-shell {
  display: grid;
  grid-template-columns: 286px minmax(0, 1fr) 328px;
  width: 100vw;
  height: 100dvh;
  overflow: hidden;
}

.app-shell.left-collapsed {
  grid-template-columns: minmax(0, 1fr) 328px;
}

.app-shell.right-collapsed {
  grid-template-columns: 286px minmax(0, 1fr);
}

.app-shell.left-collapsed.right-collapsed {
  grid-template-columns: minmax(0, 1fr);
}

.app-shell.left-collapsed .sidebar,
.app-shell.right-collapsed .preview-panel {
  display: none;
}

/* ============================================================
 * Sidebar — 左侧目录
 * ============================================================ */

.sidebar {
  min-width: 0;
  min-height: 0;
  border-right: 1px solid var(--lp-border-subtle);
  background: var(--background);
  display: grid;
  grid-template-rows: auto 1fr;
}

.brand {
  min-height: 76px;
  padding: 18px 16px 14px 18px;
  border-bottom: 1px solid var(--lp-border-divider);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.brand h1 {
  margin: 0;
  font-size: 20px;
  line-height: 1.1;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--lp-text-strong);
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--lp-text-subtle);
  font-size: 12px;
  line-height: 1.4;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.brand-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.user-email {
  font-size: 12px;
  color: var(--lp-text-subtle);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.directory-panel {
  min-height: 0;
  padding: 14px 12px;
  display: grid;
  grid-template-rows: auto auto auto 1fr;
  gap: 10px;
}

.panel-title {
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--lp-text-muted);
  font-size: 13px;
  font-weight: 500;
}

.workspace-switcher {
  display: block;
}

.workspace-switcher .secondary-button {
  width: 100%;
}

.current-path {
  min-height: 18px;
  overflow: hidden;
  color: var(--lp-text-subtle);
  font-size: 12px;
  line-height: 1.5;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-tree {
  min-height: 0;
  overflow: auto;
  padding: 4px 0 10px;
}

.tree-group {
  min-width: 0;
}

.tree-item {
  width: 100%;
  min-height: 34px;
  border: 0;
  border-radius: var(--lp-radius-card);
  padding: 7px 9px 7px calc(8px + var(--depth) * 14px);
  background: transparent;
  color: var(--lp-text-muted);
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 400;
  text-align: left;
  transition: background 120ms ease, color 120ms ease;
}

.tree-item:hover {
  background: var(--lp-surface-hover);
  color: var(--lp-text-strong);
}

.tree-caret {
  color: var(--lp-text-subtle);
  font-size: 12px;
}

.file-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-kind {
  min-width: 30px;
  color: var(--lp-text-subtle);
  font-size: 12px;
  text-align: right;
  text-transform: uppercase;
}

/* ============================================================
 * Workspace — 中间工作区
 * ============================================================ */

.workspace {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: 64px auto minmax(0, 1fr) auto;
  background: var(--background);
}

.topbar {
  min-width: 0;
  border-bottom: 1px solid var(--lp-border-divider);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 0 18px;
}

.pane-toggle {
  width: 32px;
  height: 32px;
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-panel);
  background: var(--background);
  color: var(--lp-text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}

.pane-toggle:hover {
  background: var(--lp-surface-hover);
  color: var(--lp-text-strong);
  border-color: var(--lp-border-strong);
}

.mode-hint {
  min-height: 34px;
  border-bottom: 1px solid var(--lp-border-divider);
  padding: 8px 22px;
  overflow: hidden;
  color: var(--lp-text-muted);
  font-size: 13px;
  line-height: 1.4;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Process steps — Pill 风格 B（弱填充），全局唯一风格 */
.process-steps {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.process-steps::-webkit-scrollbar {
  display: none;
}

.process-step {
  flex: 0 0 auto;
  height: 32px;
  border: 0;
  border-radius: var(--lp-radius-pill);
  padding: 0 12px;
  background: transparent;
  color: var(--lp-text-muted);
  font-size: 13px;
  font-weight: 400;
  transition: background 120ms ease, color 120ms ease;
}

.process-step:hover {
  background: var(--lp-surface-hover);
  color: var(--lp-text-strong);
}

.process-step.active {
  background: var(--lp-accent);
  color: var(--background);
  font-weight: 500;
}

.process-step.done {
  background: var(--lp-accent-soft);
  color: var(--lp-text-strong);
}

.process-step.done::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 6px;
  border-radius: 999px;
  background: var(--lp-text-strong);
  vertical-align: 1px;
}

.process-step:disabled {
  cursor: default;
}

/* ============================================================
 * Project gate — 创建项目卡（Modal A 即视感的页内卡）
 * ============================================================ */

.project-gate {
  min-height: 0;
  overflow: auto;
  display: grid;
  align-items: start;            /* 上移:不再垂直居中,贴近上方 */
  justify-items: center;
  padding: 80px 28px 28px;        /* 顶部留 80px 呼吸,而不是完全顶死 */
}

.project-card {
  width: min(720px, 100%);
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-large);
  padding: 32px;
  background: var(--background);
  box-shadow: 0 1px 2px rgba(25, 25, 25, 0.03), 0 12px 32px rgba(25, 25, 25, 0.05);
}

.project-card h2 {
  margin: 0;
  font-size: 36px;
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--lp-text-strong);
}

.project-card p {
  margin: 10px 0 20px;
  color: var(--lp-text-muted);
  font-size: 14px;
  line-height: 1.7;
}

.project-card code {
  border-radius: var(--lp-radius-comfortable);
  padding: 2px 6px;
  background: var(--lp-bg);
  font-family: var(--font-mono);
  font-size: 0.92em;
  color: var(--lp-text-strong);
}

.project-create-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 96px;
  gap: 10px;
}

.project-error {
  min-height: 20px;
  margin-top: 12px;
  color: var(--lp-error);
  font-size: 12px;
  line-height: 1.5;
}

.project-list {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* project-option — 可点击，使用 Pill 弱填充（chip-soft） */
.project-option {
  min-height: 32px;
  border: 0;
  border-radius: var(--lp-radius-pill);
  padding: 6px 14px;
  background: var(--lp-accent-soft);
  color: var(--lp-text-strong);
  font-size: 13px;
  font-weight: 400;
  transition: background 120ms ease;
}

.project-option:hover {
  background: var(--color-black-a8);
}

/* ============================================================
 * Writing stage — 草稿编辑区
 * ============================================================ */

.writing-stage {
  min-height: 0;
  overflow: hidden;
  padding: 18px clamp(18px, 4vw, 46px) 8px;
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) 24px;
  gap: 12px;
}

.draft-header {
  min-width: 0;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
}

.draft-header h2 {
  margin: 0;
  font-size: 20px;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--lp-text-strong);
}

.draft-actions {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.draft-actions .send-button,
.draft-actions .secondary-button {
  height: 36px;
}

.phase-notice {
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-card);
  padding: 10px 12px;
  background: var(--lp-bg);
  color: var(--lp-text-muted);
  font-size: 13px;
  line-height: 1.55;
}

.suggestion-panel {
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-card);
  padding: 12px;
  background: var(--lp-bg);
  display: grid;
  gap: 8px;
}

.suggestion-title {
  color: var(--lp-text-muted);
  font-size: 12px;
  font-weight: 500;
}

.suggestion-item {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 8px;
  color: var(--lp-text-muted);
  font-size: 13px;
  line-height: 1.5;
}

.suggestion-panel .send-button {
  width: 120px;
  height: 34px;
}

.draft-editor {
  min-height: 0;
  overflow: auto;
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-panel);
  padding: 26px clamp(18px, 4vw, 44px);
  background: var(--background);
  color: var(--foreground);
  font-size: 16px;
  line-height: 1.75;
  outline: none;
}

.draft-editor:focus {
  border-color: var(--lp-accent);
}

.draft-editor:empty::before {
  content: "在这里开始写作，或通过右侧采访 / 分析辅助完善文章。";
  color: var(--lp-text-subtle);
}

.compact-log {
  min-height: 20px;
  color: var(--lp-text-subtle);
  font-size: 12px;
  line-height: 20px;
}

.compact-log span {
  width: 6px;
  height: 6px;
  margin-right: 8px;
  border-radius: 999px;
  display: inline-block;
  background: var(--lp-text-subtle);
  vertical-align: 1px;
}

.compact-log span.working {
  background: var(--lp-accent);
  animation: pulse-dot 1s infinite ease-in-out;
}

/* ============================================================
 * Preview / chat panel — 右侧聊天面板
 * ============================================================ */

.preview-panel {
  min-width: 0;
  min-height: 0;
  border-left: 1px solid var(--lp-border-subtle);
  background: var(--background);
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
}

.preview-header {
  min-height: 76px;
  padding: 18px 14px 14px 16px;
  border-bottom: 1px solid var(--lp-border-divider);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.preview-header h2 {
  max-width: 190px;
  margin: 0;
  overflow: hidden;
  font-size: 20px;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--lp-text-strong);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.preview-header .secondary-button {
  width: 78px;
  flex: 0 0 auto;
}

.preview-header .secondary-button:disabled {
  opacity: var(--lp-opacity-disabled);
  cursor: not-allowed;
}

.preview-path {
  min-height: 36px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--lp-border-divider);
  overflow: hidden;
  color: var(--lp-text-subtle);
  font-size: 12px;
  line-height: 1.5;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.markdown-preview {
  min-height: 0;
  overflow: auto;
  padding: 16px;
}

.markdown-preview.empty {
  color: var(--lp-text-subtle);
  font-size: 14px;
  line-height: 1.6;
}

.history-panel {
  min-height: 0;
  overflow: auto;
  padding: 12px;
}

.chat-history {
  display: grid;
  align-content: start;
  gap: 12px;
}

.side-message-meta {
  margin-bottom: 4px;
  color: var(--lp-text-subtle);
  font-size: 12px;
  font-weight: 400;
}

.side-message-body {
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-card);
  padding: 10px 12px;
  background: var(--background);
  color: var(--foreground);
  font-size: 14px;
  line-height: 1.6;
}

.side-message.user .side-message-body {
  background: var(--lp-bg);
}

.empty-history {
  border: 1px dashed var(--lp-border-strong);
  border-radius: var(--lp-radius-card);
  padding: 14px;
  color: var(--lp-text-subtle);
  font-size: 13px;
  line-height: 1.7;
}

/* ============================================================
 * History item — 折叠的历史回合
 * ============================================================ */

.history-item {
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-card);
  margin-bottom: 10px;
  overflow: hidden;
  background: var(--background);
}

.history-item summary {
  min-height: 42px;
  padding: 0 12px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  color: var(--lp-text-muted);
  font-size: 13px;
  font-weight: 500;
}

.history-item summary span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-item summary small {
  color: var(--lp-text-subtle);
  font-size: 12px;
  font-weight: 400;
}

.history-item .markdown-preview {
  border-top: 1px solid var(--lp-border-divider);
  padding: 13px;
  font-size: 13px;
  line-height: 1.65;
}

/* ============================================================
 * Status / agent badges
 * ============================================================ */

.task-status {
  min-width: 86px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-pill);
  color: var(--lp-text-muted);
  background: var(--background);
  font-size: 12px;
  font-weight: 400;
}

.agent-activity {
  min-width: 0;
  height: 32px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 0;
  border-radius: var(--lp-radius-pill);
  padding: 0 12px;
  background: var(--lp-accent-soft);
  color: var(--lp-text-strong);
  font-size: 12px;
  line-height: 1;
}

.agent-activity.idle {
  background: var(--lp-bg);
  color: var(--lp-text-subtle);
}

.activity-label {
  min-width: 0;
  overflow: hidden;
  color: var(--lp-text-strong);
  font-weight: 500;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.agent-activity.idle .activity-label {
  color: var(--lp-text-subtle);
}

.activity-agents {
  flex: 0 1 auto;
  max-width: 96px;
  overflow: hidden;
  color: var(--lp-text-muted);
  font-weight: 400;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.activity-dots {
  flex: 0 0 auto;
  display: inline-flex;
  gap: 4px;
}

.activity-dots i {
  width: 5px;
  height: 5px;
  border-radius: 999px;
  background: var(--lp-accent);
  opacity: 0.4;
  animation: pulse-dot 1s infinite ease-in-out;
}

.activity-dots i:nth-child(2) {
  animation-delay: 0.15s;
}

.activity-dots i:nth-child(3) {
  animation-delay: 0.3s;
}

.agent-activity.idle .activity-dots {
  display: none;
}

/* ============================================================
 * Conversation — 主对话区
 * ============================================================ */

.conversation {
  min-height: 0;
  overflow: auto;
  padding: 24px clamp(22px, 4vw, 56px);
  border: 1px solid transparent;
}

.conversation.dragging {
  border-color: var(--lp-accent);
  background: var(--lp-accent-soft);
}

.message {
  max-width: 900px;
  margin: 0 0 20px;
}

.message.user {
  margin-left: auto;
  max-width: 760px;
}

.message-meta {
  margin-bottom: 6px;
  color: var(--lp-text-subtle);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.message-body,
.markdown-preview,
.approval-preview,
.draft-editor {
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-card);
  padding: 16px 18px;
  background: var(--background);
  color: var(--foreground);
  font-size: 15px;
  line-height: 1.7;
}

.markdown-preview {
  border: 0;
  border-radius: 0;
}

/* Markdown 内的标题 */
.message-body h1,
.message-body h2,
.message-body h3,
.message-body h4,
.markdown-preview h1,
.markdown-preview h2,
.markdown-preview h3,
.markdown-preview h4,
.approval-preview h1,
.approval-preview h2,
.approval-preview h3,
.approval-preview h4,
.draft-editor h1,
.draft-editor h2,
.draft-editor h3,
.draft-editor h4 {
  margin: 0 0 10px;
  color: var(--lp-text-strong);
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.message-body h1,
.markdown-preview h1,
.approval-preview h1,
.draft-editor h1 {
  font-size: 24px;
}

.message-body h2,
.markdown-preview h2,
.approval-preview h2,
.draft-editor h2 {
  font-size: 20px;
}

.message-body h3,
.markdown-preview h3,
.approval-preview h3,
.draft-editor h3 {
  font-size: 17px;
}

.message-body p,
.message-body ul,
.message-body pre,
.message-body blockquote,
.message-body .table-wrap,
.markdown-preview p,
.markdown-preview ul,
.markdown-preview pre,
.markdown-preview blockquote,
.markdown-preview .table-wrap,
.approval-preview p,
.approval-preview ul,
.approval-preview pre,
.approval-preview blockquote,
.approval-preview .table-wrap,
.draft-editor p,
.draft-editor ul,
.draft-editor pre,
.draft-editor blockquote,
.draft-editor .table-wrap {
  margin: 0 0 12px;
}

.message-body p:last-child,
.message-body ul:last-child,
.message-body pre:last-child,
.message-body blockquote:last-child,
.message-body .table-wrap:last-child,
.markdown-preview p:last-child,
.markdown-preview ul:last-child,
.markdown-preview pre:last-child,
.markdown-preview blockquote:last-child,
.markdown-preview .table-wrap:last-child,
.approval-preview p:last-child,
.approval-preview ul:last-child,
.approval-preview pre:last-child,
.approval-preview blockquote:last-child,
.approval-preview .table-wrap:last-child,
.draft-editor p:last-child,
.draft-editor ul:last-child,
.draft-editor pre:last-child,
.draft-editor blockquote:last-child,
.draft-editor .table-wrap:last-child {
  margin-bottom: 0;
}

.message-body ul,
.markdown-preview ul,
.approval-preview ul,
.draft-editor ul {
  padding-left: 20px;
}

.message-body li,
.markdown-preview li,
.approval-preview li,
.draft-editor li {
  margin: 4px 0;
}

.message-body code,
.markdown-preview code,
.approval-preview code,
.draft-editor code {
  border-radius: var(--lp-radius-comfortable);
  padding: 2px 6px;
  background: var(--lp-bg);
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.message-body pre,
.markdown-preview pre,
.approval-preview pre,
.draft-editor pre {
  overflow: auto;
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-card);
  padding: 12px;
  background: var(--lp-bg);
}

.message-body pre code,
.markdown-preview pre code,
.approval-preview pre code,
.draft-editor pre code {
  padding: 0;
  background: transparent;
}

.message-body a,
.markdown-preview a,
.approval-preview a,
.draft-editor a {
  color: var(--lp-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--lp-border-strong);
  transition: text-decoration-color 120ms ease, opacity 120ms ease;
}

.message-body a:hover,
.markdown-preview a:hover,
.approval-preview a:hover,
.draft-editor a:hover {
  text-decoration-color: var(--lp-accent);
  opacity: 0.85;
}

.message-body blockquote,
.markdown-preview blockquote,
.approval-preview blockquote,
.draft-editor blockquote {
  border-left: 2px solid var(--lp-border-strong);
  padding: 4px 0 4px 12px;
  background: transparent;
  color: var(--lp-text-muted);
}

.table-wrap {
  width: 100%;
  overflow: auto;
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-card);
}

.message-body table,
.markdown-preview table,
.approval-preview table,
.draft-editor table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.message-body th,
.message-body td,
.markdown-preview th,
.markdown-preview td,
.approval-preview th,
.approval-preview td,
.draft-editor th,
.draft-editor td {
  border-bottom: 1px solid var(--lp-border-divider);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

.message-body th,
.markdown-preview th,
.approval-preview th,
.draft-editor th {
  background: var(--lp-bg);
  color: var(--lp-text-strong);
  font-weight: 500;
}

.message-body tr:last-child td,
.markdown-preview tr:last-child td,
.approval-preview tr:last-child td,
.draft-editor tr:last-child td {
  border-bottom: 0;
}

.message.user .message-body {
  background: var(--lp-bg);
}

/* ============================================================
 * Agent work — 多 agent 进行中
 * ============================================================ */

.agent-work {
  display: grid;
  gap: 12px;
}

.agent-work-header {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--lp-text-strong);
  font-size: 14px;
  font-weight: 500;
}

.agent-work-header i {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--lp-accent);
  opacity: 0.4;
  animation: pulse-dot 1s infinite ease-in-out;
}

.agent-work-header i:nth-child(3) {
  animation-delay: 0.15s;
}

.agent-work-header i:nth-child(4) {
  animation-delay: 0.3s;
}

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

.agent-pill {
  height: 28px;
  display: inline-flex;
  align-items: center;
  border: 0;
  border-radius: var(--lp-radius-pill);
  padding: 0 12px;
  background: var(--lp-accent-soft);
  color: var(--lp-text-strong);
  font-size: 12px;
  font-weight: 400;
}

@keyframes pulse-dot {
  0%,
  80%,
  100% {
    opacity: 0.25;
    transform: translateY(0);
  }
  40% {
    opacity: 1;
    transform: translateY(-2px);
  }
}

/* ============================================================
 * Composer — 主对话输入区 / 侧边输入区
 * DESIGN.md §4 Chat Input：16px 大圆角，无 box-shadow，
 * focus-within 时容器不再加视觉强化（textarea 自身的 border 变色）
 * ============================================================ */

.composer {
  position: relative;
  margin: 0 clamp(18px, 4vw, 56px) 18px;
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-chat);
  background: var(--background);
  transition: border-color 200ms ease;
}

.composer.is-hidden {
  display: none;
}

.composer:focus-within {
  border-color: var(--lp-border-strong);
}

.composer.dragging {
  border-color: var(--lp-accent);
  background: var(--lp-accent-soft);
}

.side-composer {
  margin: 0;
  border-width: 1px 0 0;
  border-radius: 0;
}

.side-composer:focus-within {
  border-color: var(--lp-border-divider);
}

.side-composer .prompt-row {
  grid-template-columns: minmax(0, 1fr) 64px;
  gap: 8px;
  padding: 10px;
}

.side-composer #promptInput {
  height: 68px;
  font-size: 13px;
}

.side-composer .send-button {
  height: 36px;
}

.attachment-tray {
  display: none;
  gap: 8px;
  flex-wrap: wrap;
  padding: 10px 12px 0;
}

.attachment-tray.has-attachments {
  display: flex;
}

/* attachment chip — Pill 风格 B 弱填充，可关闭 */
.attachment-chip {
  max-width: 240px;
  height: 28px;
  border: 0;
  border-radius: var(--lp-radius-pill);
  padding: 0 10px 0 6px;
  background: var(--lp-accent-soft);
  color: var(--lp-text-strong);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  font-weight: 400;
  transition: background 120ms ease;
}

.attachment-chip:hover {
  background: var(--color-black-a8);
}

.attachment-chip span:nth-child(2) {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.attachment-chip .chip-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  color: var(--lp-text-muted);
  font-weight: 400;
}

.file-icon {
  min-width: 28px;
  height: 18px;
  border-radius: var(--lp-radius-comfortable);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 6px;
  background: var(--background);
  color: var(--lp-text-muted);
  border: 1px solid var(--lp-border-subtle);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.mention-menu {
  position: absolute;
  left: 12px;
  right: 98px;
  bottom: calc(100% - 8px);
  z-index: 10;
  max-height: 292px;
  overflow: auto;
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-panel);
  padding: 6px;
  background: var(--background);
}

.mention-option {
  width: 100%;
  min-height: 42px;
  border: 0;
  border-radius: var(--lp-radius-card);
  padding: 7px 9px;
  background: transparent;
  color: var(--lp-text-muted);
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  text-align: left;
  transition: background 120ms ease, color 120ms ease;
}

.mention-option:hover,
.mention-option.active {
  background: var(--lp-surface-hover);
  color: var(--lp-text-strong);
}

.mention-main {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.mention-main b,
.mention-main small {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mention-main b {
  color: var(--lp-text-strong);
  font-size: 13px;
  font-weight: 500;
}

.mention-main small {
  color: var(--lp-text-subtle);
  font-size: 12px;
  font-weight: 400;
}

.prompt-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 86px;
  gap: 10px;
  padding: 12px;
  align-items: end;
}

#promptInput {
  height: 72px;
  max-height: 128px;
  resize: none;
  border: 0;
  outline: 0;
  padding: 4px 2px;
  color: var(--foreground);
  background: transparent;
  line-height: 1.6;
  font-size: 14px;
}

#promptInput::placeholder {
  color: var(--lp-text-subtle);
}

/* ============================================================
 * Inputs — 文本输入
 * DESIGN.md §4 Input：6px 圆角，focus 只改 border-color，
 * 不加自定义焦点环（§9.1）
 * ============================================================ */

input,
textarea {
  width: 100%;
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-comfortable);
  color: var(--foreground);
  background: var(--background);
  outline: 0;
  font-size: 14px;
  font-weight: 400;
  transition: border-color 120ms ease;
}

input {
  height: 36px;
  padding: 0 12px;
}

input::placeholder,
textarea::placeholder {
  color: var(--lp-text-subtle);
}

input:focus,
textarea:focus {
  border-color: var(--lp-accent);
}

#promptInput:focus {
  border-color: transparent;
}

/* ============================================================
 * Buttons — Primary / Secondary / Icon
 * DESIGN.md §4
 * ============================================================ */

.send-button,
.secondary-button {
  border-radius: var(--lp-radius-comfortable);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0;
  transition: background 120ms ease, border-color 120ms ease, opacity 120ms ease;
}

.send-button {
  height: 36px;
  padding: 0 16px;
  border: 0;
  background: var(--lp-accent);
  color: var(--background);
}

.send-button:hover {
  background: #000;
}

.send-button:active {
  opacity: 0.85;
}

.send-button:disabled {
  opacity: var(--lp-opacity-disabled);
  cursor: not-allowed;
}

.secondary-button {
  height: 36px;
  padding: 0 14px;
  border: 1px solid var(--lp-border-subtle);
  background: var(--background);
  color: var(--lp-text-strong);
}

.secondary-button:hover {
  background: var(--lp-surface-hover);
  border-color: var(--lp-border-strong);
}

.secondary-button:active {
  background: var(--lp-surface-active);
}

.icon-button {
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  border: 0;
  border-radius: var(--lp-radius-panel);
  background: transparent;
  color: var(--lp-text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 120ms ease, color 120ms ease;
}

.icon-button:hover {
  background: var(--lp-surface-hover);
  color: var(--lp-text-strong);
}

.icon-button svg {
  display: block;
  width: 18px;
  height: 18px;
  stroke-width: 2;
  stroke: currentColor;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ============================================================
 * Approval card
 * ============================================================ */

.approval-card {
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-panel);
  padding: 16px;
  background: var(--background);
}

.approval-preview {
  max-height: min(62vh, 620px);
  overflow: auto;
  margin-bottom: 12px;
  background: var(--lp-bg);
}

.approval-editor {
  min-height: min(52vh, 520px);
  padding: 18px 20px;
  background: var(--background);
  cursor: text;
}

.approval-editor:focus {
  border-color: var(--lp-accent);
  outline: none;
}

.approval-actions {
  margin-top: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--lp-text-muted);
  font-size: 13px;
}

.approval-actions .send-button {
  width: 96px;
}

/* ============================================================
 * Dialogs — Modal A / Modal B
 * DESIGN.md §4 Modal：20px 圆角，无阴影，遮罩 rgba(0,0,0,0.8)
 * ============================================================ */

.settings-dialog,
.directory-dialog {
  width: min(720px, calc(100vw - 32px));
  border: 0;
  border-radius: var(--lp-radius-large);
  padding: 0;
  background: var(--background);
}

.directory-dialog {
  width: min(620px, calc(100vw - 32px));
}

.settings-dialog::backdrop,
.directory-dialog::backdrop {
  background: rgba(0, 0, 0, 0.8);
}

.settings-content,
.directory-content {
  padding: 32px;
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
}

.settings-header h2 {
  margin: 0;
  font-size: 20px;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--lp-text-strong);
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.settings-grid label {
  display: grid;
  gap: 8px;
  color: var(--lp-text-muted);
  font-size: 13px;
  font-weight: 400;
}

.settings-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  color: var(--lp-text-subtle);
  font-size: 13px;
}

.settings-actions .send-button {
  min-width: 92px;        /* 短文案("Save")保持视觉一致;长文案("生成风格指纹")自动撑开,不换行 */
  white-space: nowrap;
}

.settings-note {
  margin: -4px 0 16px;
  color: var(--lp-text-muted);
  font-size: 13px;
  line-height: 1.6;
}

.style-source {
  width: 100%;
  min-height: 220px;
  resize: vertical;
  padding: 12px;
  line-height: 1.6;
}

.settings-button-row {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.directory-actions {
  display: grid;
  grid-template-columns: 82px 82px 112px;
  gap: 10px;
  margin-bottom: 12px;
}

.directory-current {
  min-height: 34px;
  margin-bottom: 10px;
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-card);
  padding: 8px 12px;
  overflow: hidden;
  color: var(--lp-text-muted);
  background: var(--lp-bg);
  font-size: 13px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.directory-list {
  max-height: 360px;
  overflow: auto;
  display: grid;
  gap: 4px;
}

.directory-option {
  min-height: 36px;
  border: 0;
  border-radius: var(--lp-radius-card);
  padding: 0 12px;
  background: transparent;
  color: var(--lp-text-muted);
  text-align: left;
  font-size: 13px;
  transition: background 120ms ease, color 120ms ease;
}

.directory-option:hover {
  background: var(--lp-surface-hover);
  color: var(--lp-text-strong);
}

/* ============================================================
 * Auth gate
 * DESIGN.md §4 Modal A：左对齐、无分割线、白底、20px 圆角
 * ============================================================ */

.auth-gate {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--background);
  z-index: 100;
}

.auth-card {
  width: 100%;
  max-width: 400px;
  padding: 32px;
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-large);
  background: var(--background);
}

.auth-brand {
  margin-bottom: 24px;
}

.auth-brand h1 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 4px 0 0;
  color: var(--lp-text-strong);
}

.auth-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--lp-border-divider);
}

.auth-tab {
  padding: 8px 16px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--lp-text-muted);
  font-size: 14px;
  font-weight: 400;
  cursor: pointer;
  margin-bottom: -1px;
  transition: color 120ms ease, border-color 120ms ease;
}

.auth-tab:hover {
  color: var(--lp-text-strong);
}

.auth-tab.active {
  color: var(--lp-text-strong);
  border-bottom-color: var(--lp-accent);
  font-weight: 500;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.auth-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  font-weight: 400;
  color: var(--lp-text-muted);
}

.auth-form input {
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--lp-border-subtle);
  border-radius: var(--lp-radius-comfortable);
  background: var(--background);
  color: var(--foreground);
  font-size: 14px;
}

.auth-form input:focus {
  border-color: var(--lp-accent);
}

.auth-error {
  font-size: 13px;
  color: var(--lp-error);
  min-height: 18px;
  line-height: 1.5;
}

.auth-submit {
  width: 100%;
  height: 44px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--lp-radius-panel);
  margin-top: 4px;
}

/* ============================================================
 * Responsive
 * ============================================================ */

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 230px minmax(0, 1fr);
  }

  .preview-panel {
    display: none;
  }

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

  .agent-activity {
    display: none;
  }
}

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

  .sidebar {
    display: none;
  }

  .topbar {
    padding: 0 12px;
  }

  .conversation {
    padding: 18px;
  }

  .composer {
    margin: 0 12px 12px;
  }

  .settings-grid {
    grid-template-columns: 1fr;
  }
}