/* /chat 简历助手前端样式（M4）：移动端优先，零构建链、零 CDN。
   布局：窄屏单栏（对话 / 流程 标签切换）；≥900px 双栏（对话 + 右栏常驻）。 */

:root {
  --bg: #0d1117;
  --bg-soft: #131a24;
  --border: rgba(148, 163, 184, 0.16);
  --text: #e6edf3;
  --text-dim: #9aa7b4;
  --accent: #2f81f7;
  --accent-soft: rgba(47, 129, 247, 0.14);
  --ok: #3fb950;
  --warn: #d29922;
  --err: #f85149;
  --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-text-size-adjust: 100%;
}

body {
  display: flex;
  flex-direction: column;
  /* iOS Safari 地址栏收放：用 dvh 更稳，退化为 vh */
  min-height: 100vh;
  min-height: 100dvh;
}

/* ---------- 顶栏 ---------- */

#topbar {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name { font-weight: 650; letter-spacing: 0.3px; }
.brand-sub { font-size: 12px; color: var(--text-dim); }

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

.link-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
.link-btn:hover { border-color: var(--accent); color: var(--accent); }
.link-btn.block { display: block; width: 100%; text-align: center; margin-top: 10px; }

.mobile-only { display: none; }

/* ---------- 维护态横幅 ---------- */

.maintenance {
  flex: none;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: rgba(210, 153, 34, 0.12);
  border-bottom: 1px solid rgba(210, 153, 34, 0.35);
  color: #f0d48a;
  font-size: 14px;
}
.maintenance-icon {
  flex: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: rgba(210, 153, 34, 0.25);
  border: 1px solid rgba(210, 153, 34, 0.6);
  display: grid; place-items: center;
  font-weight: 700; font-size: 12px;
}

.hidden { display: none !important; }

/* ---------- 主区 ---------- */

#layout {
  flex: 1 1 auto;
  display: flex;
  min-height: 0;
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
}

.pane { min-height: 0; }

#chat-pane {
  flex: 1 1 auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 16px 16px 8px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#side {
  flex: none;
  width: 340px;
  border-left: 1px solid var(--border);
  padding: 16px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* ---------- 对话流 ---------- */

.intro-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  background: var(--bg-soft);
}
.intro-card h1 { margin: 0 0 6px; font-size: 16px; }
.intro-card p { margin: 0; color: var(--text-dim); font-size: 13.5px; }

.msg { border-radius: var(--radius); padding: 12px 14px; border: 1px solid var(--border); }
.msg-user {
  align-self: flex-end;
  max-width: 88%;
  background: var(--accent-soft);
  border-color: rgba(47, 129, 247, 0.35);
}
.msg-user .label { font-size: 11px; color: var(--text-dim); display: block; margin-bottom: 3px; }

/* Agent 步骤卡（时间线） */
.step {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 9px 12px;
  border-left: 2px solid var(--border);
  background: rgba(255, 255, 255, 0.015);
  border-radius: 0 8px 8px 0;
}
.step .head { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--text-dim); }
.step .badge {
  font-size: 11px; padding: 1px 7px; border-radius: 999px;
  border: 1px solid var(--border); color: var(--text-dim);
}
.step .ms { margin-left: auto; font-variant-numeric: tabular-nums; }
.step.is-error { border-left-color: var(--err); }
.step.is-error .badge { color: var(--err); border-color: rgba(248, 81, 73, 0.45); }

/* 运行轨迹折叠块（M6 UX）：默认收起，面试官只看得到问答，想深挖再点开。
   收起态只留一行标题（步骤数 + 状态），展开态才显示内部步骤卡。*/
.trace {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(148, 163, 184, 0.05);
  overflow: hidden;
}
.trace-head {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  border: 0;
  background: transparent;
  color: var(--text-dim);
  font: inherit;
  font-size: 12.5px;
  text-align: left;
  cursor: pointer;
}
.trace-head:hover { color: var(--text); background: rgba(148, 163, 184, 0.07); }
.trace-caret { font-size: 10px; transition: transform 0.15s ease; }
.trace[data-state="expanded"] .trace-caret { transform: rotate(90deg); }
.trace-meta { margin-left: auto; font-variant-numeric: tabular-nums; }
.trace-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px 8px 9px;
  border-top: 1px dashed var(--border);
}
.trace[data-state="collapsed"] .trace-body { display: none; }
.trace.is-error { border-color: rgba(248, 81, 73, 0.4); }
.trace.is-error .trace-head { color: var(--err); }

.msg-answer {
  background: var(--bg-soft);
  border-color: rgba(63, 185, 80, 0.28);
}
.msg-answer .label { font-size: 11px; color: var(--ok); display: block; margin-bottom: 5px; }
.msg-answer.is-error { border-color: rgba(248, 81, 73, 0.4); }

.rich p { margin: 0 0 8px; }
.rich p:last-child { margin-bottom: 0; }
.rich ul { margin: 0 0 8px; padding-left: 20px; }
.rich li { margin: 2px 0; }
.rich strong { color: #fff; }
.rich code:not(.code-block code) {
  background: rgba(148, 163, 184, 0.16);
  padding: 1px 5px; border-radius: 4px; font-size: 13px;
}
.code-block {
  position: relative;
  background: #06090f;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  overflow-x: auto;
  margin: 8px 0;
}
.code-block code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12.5px; }
.code-lang {
  position: absolute; top: 6px; right: 10px;
  font-size: 10.5px; color: var(--text-dim); text-transform: uppercase;
}
.md-table { border-collapse: collapse; width: 100%; margin: 8px 0; font-size: 13px; }
.md-table th, .md-table td { border: 1px solid var(--border); padding: 5px 9px; text-align: left; }
.md-table th { background: rgba(148, 163, 184, 0.1); }

.cursor::after {
  content: "▍";
  color: var(--accent);
  animation: blink 1s steps(2, start) infinite;
}
@keyframes blink { to { visibility: hidden; } }

/* ---------- 右栏默认态：气泡卡 + 简历卡 ---------- */

.side-block + .side-block, .side-block + .resume-card { margin-top: 14px; }
.side-title-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.side-title { font-size: 13px; color: var(--text-dim); margin-bottom: 8px; }

/* 移动端：气泡横向滚动（窄屏一屏内可左右滑动），桌面端纵向列表 */
.bubbles { display: flex; flex-direction: column; gap: 8px; }

.bubble {
  appearance: none;
  text-align: left;
  font: inherit;
  font-size: 13.5px;
  color: var(--text);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s;
}
.bubble:hover { border-color: var(--accent); }
.bubble:active { transform: scale(0.985); }
.bubble:disabled { opacity: 0.5; cursor: not-allowed; }

.resume-card {
  display: block;
  text-decoration: none;
  color: var(--text);
  border: 1px solid rgba(47, 129, 247, 0.35);
  background: linear-gradient(135deg, rgba(47, 129, 247, 0.13), rgba(13, 17, 23, 0));
  border-radius: var(--radius);
  padding: 13px 14px;
}
.resume-card-title { display: block; font-weight: 600; margin-bottom: 3px; }
.resume-card-sub { display: block; font-size: 12.5px; color: var(--text-dim); }
.resume-card-cta { display: block; margin-top: 8px; font-size: 13px; color: var(--accent); }

/* ---------- 右栏对话态：运行流程 ---------- */

.flow-status { font-size: 11.5px; padding: 2px 9px; border-radius: 999px; border: 1px solid var(--border); }
.flow-status.idle { color: var(--text-dim); }
.flow-status.run { color: var(--accent); border-color: rgba(47, 129, 247, 0.5); }
.flow-status.done { color: var(--ok); border-color: rgba(63, 185, 80, 0.5); }
.flow-status.error { color: var(--err); border-color: rgba(248, 81, 73, 0.5); }

#flow-stage { position: relative; }

.flow-link { fill: none; stroke: rgba(148, 163, 184, 0.28); stroke-width: 1.4; transition: stroke 0.3s; }
.flow-link.lit { stroke: var(--accent); stroke-width: 2.1; }
.flow-link.ret.lit { stroke: var(--ok); }
.flow-link.ans.lit { stroke: var(--accent); }

.flow-node rect {
  fill: rgba(19, 26, 36, 0.85);
  stroke: rgba(148, 163, 184, 0.28);
  stroke-width: 1.1;
  transition: stroke 0.25s, fill 0.25s;
}
.flow-node .nt { fill: var(--text); font-size: 12.5px; font-weight: 600; }
.flow-node .ns { fill: var(--text-dim); font-size: 10px; }
.flow-node.active rect { stroke: var(--accent); fill: rgba(47, 129, 247, 0.13); }
.flow-node.done rect { stroke: rgba(63, 185, 80, 0.85); }
.flow-node.error rect { stroke: var(--err); }

.flow-dot { fill: var(--accent); filter: drop-shadow(0 0 5px rgba(47, 129, 247, 0.85)); }

.flow-caption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-dim);
  min-height: 34px;
}

/* ---------- 输入栏 ---------- */

#input-bar {
  flex: none;
  display: flex;
  gap: 8px;
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--border);
  background: rgba(13, 17, 23, 0.95);
  backdrop-filter: blur(8px);
}
#input-bar input {
  flex: 1 1 auto;
  min-width: 0;
  font: inherit;
  color: var(--text);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 10px 16px;
}
#input-bar input:focus { outline: none; border-color: var(--accent); }
#input-bar button {
  flex: none;
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 999px;
  padding: 10px 20px;
  cursor: pointer;
}
#input-bar button:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------- 移动端（< 900px）：单栏 + 对话/流程 切换 ----------
   布局：上方对话区 + 下方「建议问题（横滚）+ 简历卡」常驻可见——移动端用户
   默认就能看到气泡卡与简历入口（不能把侧栏整体藏掉，否则等于没有引导入口）；
   点「流程」切到运行流程图（对话区让位，侧栏撑满）。 */

@media (max-width: 899px) {
  .mobile-only { display: inline-block; }

  #layout { flex-direction: column; }

  #chat-pane { flex: 1 1 auto; width: 100%; }

  #side {
    flex: none;
    width: 100%;
    max-height: 42vh;
    border-left: none;
    border-top: 1px solid var(--border);
    padding: 12px 16px;
  }

  /* 流程视图：对话区让位，侧栏撑满 */
  body.show-flow #chat-pane { display: none; }
  body.show-flow #side { flex: 1 1 auto; max-height: none; }

  /* 气泡横向滚动（一屏内左右滑动看更多问题） */
  .bubbles {
    flex-direction: row;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x proximity;
    padding-bottom: 4px;
  }
  .bubble {
    flex: 0 0 auto;
    max-width: 78vw;
    white-space: normal;
    scroll-snap-align: start;
  }
  .resume-card { margin-top: 10px; }
  #flow-toggle.active { border-color: var(--accent); color: var(--accent); }
}

@media (prefers-reduced-motion: reduce) {
  .flow-dot { display: none; }
  .cursor::after { animation: none; }
}