/* =========================================================
   南方艺蕾 · 在线客服
   浅色、专业的客服对话界面
   ========================================================= */

:root {
  --bg: #eef2f7;
  --surface: #ffffff;
  --surface-2: #f6f9fc;
  --line: #e4eaf3;
  --line-2: #d7e0ec;
  --text: #1b2430;
  --text-2: #56657c;
  --text-3: #8b98ab;

  --brand: #2563c9;
  --brand-2: #12a594;
  --brand-soft: #eaf1fd;
  --accent: #f0a92e;
  --danger: #d64545;

  --grad: linear-gradient(135deg, #2563c9, #12a594);
  --shadow-sm: 0 1px 2px rgba(23, 43, 77, .05), 0 4px 14px rgba(23, 43, 77, .05);
  --shadow-md: 0 12px 40px rgba(23, 43, 77, .10);

  --r-lg: 20px;
  --r-md: 14px;
  --r-sm: 10px;
}

* { box-sizing: border-box; }

/* 作者样式表里的 display 会盖过浏览器默认的 [hidden]{display:none}，
   导致 hidden 属性失效（停止按钮、回到底部按钮曾因此在空闲时露出），
   这里显式兜底。 */
[hidden] { display: none !important; }

html, body { height: 100%; }

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(880px 500px at 10% -12%, #dbe7ff 0%, rgba(219, 231, 255, 0) 62%),
    radial-gradient(760px 460px at 94% 4%, #d6f4ed 0%, rgba(214, 244, 237, 0) 60%),
    var(--bg);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

/* ---------------- 布局 ---------------- */

.app {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  height: 100dvh;
  max-width: 1000px;
  margin: 0 auto;
  background: var(--surface);
  box-shadow: var(--shadow-md);
}

@media (min-width: 1040px) {
  body { padding: 22px 0; }
  .app {
    height: calc(100dvh - 44px);
    border-radius: var(--r-lg);
    overflow: hidden;
    border: 1px solid var(--line);
  }
}

/* ---------------- 顶栏 ---------------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 18px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 11px; min-width: 0; }

.mark {
  display: grid;
  place-items: center;
  width: 42px; height: 42px;
  border-radius: 12px;
  background: var(--grad);
  flex: none;
}
.mark svg { display: block; }

.brand-text { display: flex; flex-direction: column; line-height: 1.25; min-width: 0; }
.brand-text strong { font-size: 17px; letter-spacing: .4px; }
.brand-text small { color: var(--text-3); font-size: 12px; letter-spacing: .3px; }

.topbar-right { display: flex; align-items: center; gap: 10px; flex: none; }

.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px 5px 9px;
  border-radius: 999px;
  background: #eefaf4;
  color: #0f7a55;
  font-size: 12.5px;
  white-space: nowrap;
  border: 1px solid #d5f0e4;
}
.status[data-state="busy"] { background: var(--brand-soft); color: var(--brand); border-color: #d3e2fb; }
.status[data-state="error"] { background: #fdeeee; color: var(--danger); border-color: #f7d9d9; }

.pulse {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 0 currentColor;
  animation: pulse 2.2s ease-out infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(15, 122, 85, .45); }
  70%  { box-shadow: 0 0 0 7px rgba(15, 122, 85, 0); }
  100% { box-shadow: 0 0 0 0 rgba(15, 122, 85, 0); }
}

.ghost-btn {
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: var(--surface);
  color: var(--text-2);
  font: inherit;
  font-size: 13.5px;
  cursor: pointer;
  transition: .16s;
  white-space: nowrap;
}
.ghost-btn:hover { color: var(--brand); border-color: #b9d0f2; background: var(--brand-soft); }
.ghost-btn:active { transform: translateY(1px); }

/* ---------------- 消息区 ---------------- */

.stage { position: relative; min-height: 0; background: var(--surface-2); }

.messages {
  height: 100%;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 22px 20px 8px;
  scroll-behavior: smooth;
}
.messages::-webkit-scrollbar { width: 10px; }
.messages::-webkit-scrollbar-thumb { background: #d8e0ec; border: 3px solid var(--surface-2); border-radius: 20px; }
.messages::-webkit-scrollbar-thumb:hover { background: #c3cedf; }

.msg {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
  align-items: flex-start;
  animation: rise .28s ease both;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}

.msg.me { flex-direction: row-reverse; }

.avatar {
  flex: none;
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  border-radius: 50%;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  background: var(--grad);
  user-select: none;
  margin-top: 20px;
}
.msg.ai .avatar { background: var(--grad); }
.msg.me .avatar { background: #cfd8e6; color: #4a5a73; }
.msg.sys .avatar { background: #f0b429; color: #fff; }

.bubble-col { display: flex; flex-direction: column; min-width: 0; max-width: min(84%, 680px); }
.msg.me .bubble-col { align-items: flex-end; }

.who {
  font-size: 12.5px;
  color: var(--text-3);
  margin: 0 4px 5px;
  letter-spacing: .2px;
}

.bubble {
  padding: 12px 15px;
  border-radius: var(--r-md);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  overflow-wrap: anywhere;
}
.msg.ai .bubble { border-top-left-radius: 5px; }
.msg.me .bubble {
  background: var(--grad);
  border-color: transparent;
  color: #fff;
  border-top-right-radius: 5px;
  box-shadow: 0 6px 18px rgba(37, 99, 201, .22);
}
.msg.sys .bubble {
  background: #fff9ec;
  border-color: #f6e2bb;
  color: #8a6417;
}

.bubble > :first-child { margin-top: 0; }
.bubble > :last-child { margin-bottom: 0; }
.bubble p { margin: 0 0 .6em; }
.bubble h1, .bubble h2, .bubble h3, .bubble h4 { margin: .8em 0 .4em; font-size: 1.06em; line-height: 1.4; }
.bubble ul, .bubble ol { margin: .3em 0 .7em; padding-left: 1.35em; }
.bubble li { margin: .18em 0; }
.bubble a { color: var(--brand); }
.msg.me .bubble a { color: #eaf4ff; text-decoration: underline; }
.bubble blockquote {
  margin: .5em 0;
  padding: .2em .9em;
  border-left: 3px solid var(--line-2);
  color: var(--text-2);
}
.bubble hr { border: 0; border-top: 1px solid var(--line); margin: .9em 0; }
.bubble code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .9em;
  background: rgba(37, 99, 201, .08);
  padding: .1em .38em;
  border-radius: 5px;
}
.msg.me .bubble code { background: rgba(255, 255, 255, .22); }

.codeblock {
  margin: .6em 0;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  overflow: hidden;
  background: #f8fafd;
}
.codeblock-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 10px;
  background: #eef2f8;
  border-bottom: 1px solid var(--line);
  font-size: 12px;
  color: var(--text-3);
}
.copy-btn {
  border: 1px solid var(--line-2);
  background: #fff;
  color: var(--text-2);
  font: inherit;
  font-size: 12px;
  padding: 2px 9px;
  border-radius: 6px;
  cursor: pointer;
}
.copy-btn:hover { color: var(--brand); border-color: #b9d0f2; }
.codeblock pre { margin: 0; padding: 11px 12px; overflow-x: auto; }
.codeblock code { background: none; padding: 0; font-size: 12.8px; line-height: 1.6; }

.thinking { display: inline-flex; align-items: center; gap: 8px; color: var(--text-3); font-size: 13.5px; }
.dots { display: inline-flex; gap: 4px; }
.dots i {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--brand-2);
  opacity: .35;
  animation: blink 1.3s infinite ease-in-out;
}
.dots i:nth-child(2) { animation-delay: .18s; }
.dots i:nth-child(3) { animation-delay: .36s; }
@keyframes blink {
  0%, 80%, 100% { opacity: .3; transform: translateY(0); }
  40% { opacity: 1; transform: translateY(-3px); }
}

.msg-meta { margin-top: 7px; font-size: 12.5px; color: var(--text-3); display: flex; gap: 9px; align-items: center; }
.msg-meta button {
  border: 1px solid var(--line-2);
  background: #fff;
  color: var(--brand);
  font: inherit;
  font-size: 12.5px;
  padding: 3px 11px;
  border-radius: 999px;
  cursor: pointer;
}
.msg-meta button:hover { background: var(--brand-soft); border-color: #b9d0f2; }

/* ---------------- 欢迎语与常见问题 ---------------- */

.greet-hi { margin: 0 0 8px; }
.greet-sub { margin: 0; color: var(--text-2); font-size: 14px; }

.suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 13px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-2);
}
.suggestions .label {
  width: 100%;
  font-size: 12.5px;
  color: var(--text-3);
  margin-bottom: -2px;
}
.suggestions button {
  border: 1px solid #cfdff8;
  background: var(--brand-soft);
  color: var(--brand);
  font: inherit;
  font-size: 13.5px;
  padding: 7px 13px;
  border-radius: 999px;
  cursor: pointer;
  transition: .16s;
  text-align: left;
}
.suggestions button:hover { background: #dfeafc; border-color: #b3cdf5; transform: translateY(-1px); }
.suggestions button:active { transform: none; }

/* ---------------- 回到底部 ---------------- */

.scroll-btn {
  position: absolute;
  right: 18px; bottom: 16px;
  width: 38px; height: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  background: #fff;
  color: var(--text-2);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}
.scroll-btn:hover { color: var(--brand); border-color: #b9d0f2; }

/* ---------------- 输入区 ---------------- */

.composer-wrap {
  padding: 12px 18px 12px;
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.composer {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 8px 8px 8px 14px;
  border: 1.5px solid var(--line-2);
  border-radius: var(--r-md);
  background: var(--surface);
  transition: border-color .16s, box-shadow .16s;
}
.composer:focus-within {
  border-color: #a8c6f0;
  box-shadow: 0 0 0 3px rgba(37, 99, 201, .10);
}

#input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  resize: none;
  background: none;
  color: inherit;
  font: inherit;
  line-height: 1.6;
  max-height: 168px;
  padding: 6px 0;
}
#input::placeholder { color: var(--text-3); }

.composer-actions { display: flex; align-items: center; gap: 8px; flex: none; }

.counter { font-size: 12px; color: var(--text-3); }
.counter.warn { color: var(--danger); }

.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 0;
  border-radius: 11px;
  padding: 9px 16px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  transition: .16s;
}
.icon-btn.send { background: var(--grad); color: #fff; box-shadow: 0 4px 12px rgba(37, 99, 201, .26); }
.icon-btn.send:hover { filter: brightness(1.06); }
.icon-btn.send:disabled { opacity: .5; cursor: not-allowed; box-shadow: none; }
.icon-btn.stop { background: #fdf0f0; color: var(--danger); border: 1px solid #f5d9d9; }
.icon-btn.stop:hover { background: #fbe3e3; }
.icon-btn:active { transform: translateY(1px); }

.privacy {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin: 9px 0 0;
  font-size: 12px;
  color: var(--text-3);
  text-align: center;
}
.privacy svg { flex: none; }

/* 空回复 / 已停止的占位文案。
   用类名而不是 style="opacity:.7"，这样页面可以启用不含 'unsafe-inline' 的严格 CSP。 */
.empty-note { opacity: .7; }

/* ---------------- 响应式 ---------------- */

@media (max-width: 640px) {
  body { font-size: 14.5px; }
  .topbar { padding: 10px 13px; }
  .brand-text small { display: none; }
  .mark { width: 38px; height: 38px; border-radius: 11px; }
  .messages { padding: 16px 12px 6px; }
  .bubble-col { max-width: 88%; }
  .avatar { width: 32px; height: 32px; font-size: 12px; margin-top: 19px; }
  .composer-wrap { padding: 10px 12px 10px; }
  .icon-btn span { display: none; }
  .icon-btn { padding: 10px 12px; }
  .privacy { font-size: 11.5px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  .messages { scroll-behavior: auto; }
}