/* ============================================================
   豆奶 (dounai) —— 界面样式
   参考豆包:浅色、圆角、柔和的蓝色点缀(取自 icon 的针织衫蓝)
   ============================================================ */

:root {
  --bg: #f3f5f9;
  --panel: #ffffff;
  --sidebar-bg: #f7f8fc;
  --text-1: #1f2329;
  --text-2: #5c6370;
  --text-3: #9aa2b1;
  --line: #e8ecf3;
  --line-strong: #dbe2ee;
  --brand: #5b8def;
  --brand-deep: #4a7de0;
  --brand-soft: #eef4ff;
  --bubble-assistant: #f5f8fd;
  --danger-bg: #fff4f3;
  --danger-line: #f3c7c3;
  --danger-text: #b3261e;
  --radius-md: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  font-size: 15px;
  color: var(--text-1);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

button { font-family: inherit; }

/* ---------------- 全局布局 ---------------- */

.app {
  display: flex;
  height: 100dvh;
  max-width: 1440px;
  margin: 0 auto;
  background: var(--panel);
  overflow: hidden;
}

@media (min-width: 1441px) {
  body { padding: 0; }
}

/* ---------------- 侧栏 ---------------- */

.sidebar {
  flex: 0 0 270px;
  display: flex;
  flex-direction: column;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--line);
  padding: 14px 12px 10px;
  min-width: 0;
}

.sidebar-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 6px 14px;
}

.brand-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid #fff;
  box-shadow: 0 2px 10px rgba(91, 141, 239, .28);
}

.brand-text { display: flex; flex-direction: column; min-width: 0; }
.brand-name { font-size: 17px; font-weight: 700; letter-spacing: .5px; }
.brand-sub { font-size: 11.5px; color: var(--text-3); }

.btn-new-chat {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 11px 14px;
  border: 0;
  border-radius: 12px;
  background: linear-gradient(135deg, #6f9ff2, var(--brand-deep));
  color: #fff;
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(91, 141, 239, .32);
  transition: transform .12s ease, box-shadow .12s ease;
}

.btn-new-chat svg { width: 17px; height: 17px; }
.btn-new-chat:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(91, 141, 239, .4); }
.btn-new-chat:active { transform: translateY(0); }

.conv-title {
  padding: 18px 8px 6px;
  font-size: 12px;
  color: var(--text-3);
}

.conv-list {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.conv-empty { padding: 10px 8px; font-size: 12.5px; color: var(--text-3); line-height: 1.6; }

.conv {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 10px;
  border-radius: 10px;
  cursor: pointer;
  color: var(--text-2);
  font-size: 13.5px;
  user-select: none;
}

.conv svg { width: 15px; height: 15px; flex: 0 0 auto; opacity: .7; }
.conv .title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conv:hover { background: #eef1f8; }
.conv.active { background: #e8effc; color: var(--brand-deep); font-weight: 600; }
.conv.active svg { opacity: 1; }

.conv .del {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--text-3);
  cursor: pointer;
  opacity: 0;
  transition: opacity .12s;
}

.conv:hover .del, .conv.active .del { opacity: 1; }
.conv .del:hover { background: #e3e8f2; color: var(--danger-text); }
.conv .del svg { width: 14px; height: 14px; opacity: 1; }

.sidebar-foot { border-top: 1px solid var(--line); padding-top: 10px; margin-top: 10px; display: flex; flex-direction: column; gap: 8px; }

.sidebar-ver { padding: 0 10px; font-size: 11px; color: var(--text-3); }

/* ---------------- 主区域 ---------------- */

.main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--panel);
}

.topbar {
  display: grid;
  grid-template-columns: 44px 1fr 44px;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  flex: 0 0 auto;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  transition: background .12s;
}

.icon-btn svg { width: 19px; height: 19px; }
.icon-btn:hover { background: var(--brand-soft); color: var(--brand-deep); }

.menu-btn { display: none; }

.model-chip {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  padding: 7px 14px 7px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--text-1);
  font-size: 13.5px;
}

.model-chip img { width: 24px; height: 24px; border-radius: 50%; object-fit: cover; }
.model-chip span { max-width: 320px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------------- 欢迎屏 ---------------- */

.welcome {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 20px 10px;
  gap: 6px;
  overflow-y: auto;
}

/* JS 用 el.hidden 切换显隐;作者样式里的 display:flex 会盖过 UA 的
   [hidden]{display:none},必须显式补上,否则欢迎屏不会随消息隐藏 */
.welcome[hidden], .chat[hidden] { display: none; }

.welcome-avatar {
  width: 92px;
  height: 92px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid #fff;
  outline: 1px solid var(--line);
  box-shadow: 0 10px 30px rgba(91, 141, 239, .28);
  margin-bottom: 16px;
}

.welcome h1 { margin: 0; font-size: 26px; font-weight: 700; letter-spacing: .5px; }
.welcome-sub { margin: 0; color: var(--text-3); font-size: 14.5px; }

.chips {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  width: 100%;
  max-width: 560px;
  margin-top: 30px;
}

.chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--text-2);
  font-size: 14px;
  cursor: pointer;
  text-align: left;
  transition: transform .12s, border-color .12s, box-shadow .12s;
}

.chip:hover {
  transform: translateY(-2px);
  border-color: #c6d8f7;
  box-shadow: 0 6px 18px rgba(91, 141, 239, .14);
  color: var(--text-1);
}

.chip-emoji { font-size: 18px; }

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

.chat {
  flex: 1;
  overflow-y: auto;
  padding: 12px 0 8px;
  scroll-behavior: smooth;
}

.msg {
  display: flex;
  gap: 12px;
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 10px 20px;
}

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

.avatar {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  margin-top: 2px;
}

.avatar img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; }

.avatar.user-avatar {
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #8fb0e8, #6d92d8);
  color: #fff;
}

.avatar.user-avatar svg { width: 20px; height: 20px; }

.bubble-wrap { max-width: calc(100% - 60px); min-width: 0; display: flex; flex-direction: column; }

.bubble {
  padding: 11px 15px;
  border-radius: 18px;
  font-size: 15px;
  line-height: 1.75;
  overflow-wrap: anywhere;
  white-space: normal;
}

.msg.assistant .bubble {
  background: var(--bubble-assistant);
  border: 1px solid #e9eef7;
  border-top-left-radius: 6px;
}

.msg.user .bubble {
  background: linear-gradient(135deg, #6f9ff2, var(--brand-deep));
  color: #fff;
  border-top-right-radius: 6px;
  box-shadow: 0 3px 12px rgba(91, 141, 239, .28);
}

.bubble.error { background: var(--danger-bg); border-color: var(--danger-line); color: var(--danger-text); }
.bubble.error .err-msg { display: block; white-space: pre-wrap; }

.msg-actions { display: flex; gap: 2px; margin-top: 4px; padding: 0 2px; opacity: 0; transition: opacity .15s; }
.msg:hover .msg-actions, .bubble.error ~ .msg-actions { opacity: 1; }

.act-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text-3);
  font-size: 12.5px;
  padding: 5px 9px;
  cursor: pointer;
}

.act-btn svg { width: 13.5px; height: 13.5px; }
.act-btn:hover { background: var(--brand-soft); color: var(--brand-deep); }
.msg.user .msg-actions { justify-content: flex-end; }

/* 生成中的光标 */
.cursor::after {
  content: "▍";
  color: var(--brand);
  animation: blink 1s step-start infinite;
  margin-left: 1px;
}

@keyframes blink { 50% { opacity: 0; } }

/* 思考过程(如 deepseek-reasoner 的 reasoning_content) */
details.reasoning {
  margin: 0 0 8px;
  border: 1px solid #efe4c8;
  border-radius: 12px;
  background: #fffcf2;
  font-size: 13px;
  color: #7a6428;
  overflow: hidden;
}

details.reasoning summary {
  padding: 8px 12px;
  cursor: pointer;
  user-select: none;
  list-style: none;
  font-weight: 500;
}

details.reasoning summary::-webkit-details-marker { display: none; }
details.reasoning summary::before { content: "💭 "; }
details.reasoning[open] summary { border-bottom: 1px solid #f4ead0; }
details.reasoning .reasoning-body { padding: 10px 12px; line-height: 1.7; white-space: pre-wrap; max-height: 300px; overflow-y: auto; }

/* 气泡内 Markdown 基础样式 */
.bubble p { margin: 0 0 8px; }
.bubble p:last-child { margin-bottom: 0; }
.bubble ul, .bubble ol { margin: 4px 0 8px; padding-left: 22px; }
.bubble li { margin: 3px 0; }
.bubble h1, .bubble h2, .bubble h3, .bubble h4 { margin: 12px 0 6px; font-size: 16.5px; }
.bubble h1:first-child, .bubble h2:first-child, .bubble h3:first-child { margin-top: 0; }
.bubble a { color: var(--brand-deep); }
.bubble code {
  font-family: ui-monospace, "SF Mono", Consolas, "Courier New", monospace;
  font-size: 13px;
  background: #e9eef8;
  border-radius: 6px;
  padding: 1.5px 5px;
}

.bubble pre {
  position: relative;
  margin: 8px 0;
  padding: 13px 14px;
  background: #f3f6fb;
  border: 1px solid #e4eaf4;
  border-radius: 12px;
  overflow-x: auto;
  line-height: 1.6;
}

.bubble pre code { background: transparent; padding: 0; font-size: 13px; }

.code-copy {
  position: absolute;
  top: 7px;
  right: 7px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text-2);
  font-size: 11.5px;
  padding: 3px 9px;
  cursor: pointer;
  opacity: 0;
  transition: opacity .15s;
}

.bubble pre:hover .code-copy { opacity: 1; }
.code-copy:hover { color: var(--brand-deep); border-color: #c6d8f7; }
.code-copy.done { color: #1a7f37; border-color: #b7e0c0; }

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

.composer { flex: 0 0 auto; padding: 6px 20px calc(12px + env(safe-area-inset-bottom)); }

.composer-box {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 8px 8px 8px 18px;
  background: #fff;
  border: 1.5px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 4px 20px rgba(31, 35, 41, .07);
  transition: border-color .15s, box-shadow .15s;
}

.composer-box:focus-within {
  border-color: #a9c4f2;
  box-shadow: 0 4px 22px rgba(91, 141, 239, .16);
}

.composer-box textarea {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  resize: none;
  background: transparent;
  font-family: inherit;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-1);
  max-height: 180px;
  padding: 7px 0;
}

.composer-box textarea::placeholder { color: var(--text-3); }

.btn-send {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 50%;
  background: linear-gradient(135deg, #6f9ff2, var(--brand-deep));
  color: #fff;
  cursor: pointer;
  box-shadow: 0 3px 12px rgba(91, 141, 239, .35);
  transition: opacity .15s, transform .12s;
}

.btn-send svg { width: 19px; height: 19px; }
.btn-send:hover:not(:disabled) { transform: translateY(-1px); }
.btn-send:disabled { background: #e5eaf4; color: #aab6cf; box-shadow: none; cursor: default; }

.btn-send .ic-stop { display: none; }
.btn-send.streaming { background: #1f2329; box-shadow: none; }
.btn-send.streaming .ic-send { display: none; }
.btn-send.streaming .ic-stop { display: block; }

.composer-hint { max-width: 860px; margin: 8px auto 0; text-align: center; font-size: 11.5px; color: var(--text-3); }

/* ---------------- 移动端 ---------------- */

.backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, .35);
  z-index: 20;
}

@media (max-width: 860px) {
  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 30;
    width: min(300px, 84vw);
    flex-basis: auto;
    transform: translateX(-105%);
    transition: transform .22s ease;
    box-shadow: 0 0 40px rgba(15, 23, 42, .18);
  }

  .sidebar.open { transform: none; }
  .backdrop.show { display: block; }
  .menu-btn { display: grid; }
  .chips { grid-template-columns: 1fr; }
  .model-chip span { max-width: 160px; }
  .msg, .msg.user { padding: 10px 14px; }
}

/* ---------------- 滚动条 ---------------- */

.chat::-webkit-scrollbar, .conv-list::-webkit-scrollbar { width: 8px; }
.chat::-webkit-scrollbar-thumb, .conv-list::-webkit-scrollbar-thumb {
  background: #d8dfeb;
  border-radius: 8px;
  border: 2px solid transparent;
  background-clip: content-box;
}
.chat::-webkit-scrollbar-thumb:hover { background: #c3cdde; background-clip: content-box; }