:root {
  --bg: #0b1020;
  --bg-soft: #121a33;
  --panel: #161f3d;
  --line: #26325a;
  --text: #e8ecf8;
  --muted: #8d9ac2;
  --accent: #4f7cff;
  --accent-soft: #1e2c56;
  --user: #2a3d7a;
  --ok: #37c98a;
  --warn: #ffb648;
  --err: #ff6b6b;
  --radius: 16px;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f6fc;
    --bg-soft: #ffffff;
    --panel: #ffffff;
    --line: #dde3f2;
    --text: #131a2e;
    --muted: #66708f;
    --accent: #2f5cf0;
    --accent-soft: #e6ecff;
    --user: #dce6ff;
  }
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

/* The `hidden` attribute must win over the layout display values below. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  overscroll-behavior-y: none;
}

body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  max-width: 780px;
  margin: 0 auto;
}

/* ---------- top bar ---------- */
.bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: calc(var(--safe-t) + 8px) 10px 8px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.title-wrap { flex: 1; min-width: 0; }

.bar h1 {
  font-size: 16px;
  margin: 0;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conn {
  font-size: 11px;
  color: var(--ok);
}
.conn.offline { color: var(--err); }
.conn.busy { color: var(--warn); }

.icon-btn {
  width: 40px;
  height: 40px;
  flex: 0 0 40px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
}
.icon-btn:active { background: var(--accent-soft); }
.icon-btn svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }

/* ---------- stream ---------- */
.stream {
  flex: 1;
  overflow-y: auto;
  padding: 14px 12px 8px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-behavior: smooth;
}

.msg { max-width: 88%; display: flex; flex-direction: column; gap: 4px; }
.msg.user { align-self: flex-end; align-items: flex-end; }
.msg.assistant, .msg.system { align-self: flex-start; }

.bubble {
  padding: 10px 13px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
}
.msg.user .bubble { background: var(--user); border-color: transparent; }
.msg.system .bubble { background: transparent; border-style: dashed; color: var(--muted); font-size: 14px; }

.bubble p { margin: 0 0 8px; }
.bubble p:last-child { margin-bottom: 0; }
.bubble code {
  background: color-mix(in srgb, var(--accent-soft) 70%, transparent);
  padding: 1px 5px;
  border-radius: 6px;
  font-size: 13.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.bubble pre {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  overflow-x: auto;
  font-size: 13px;
  margin: 6px 0;
}
.bubble pre code { background: none; padding: 0; }
.bubble a { color: var(--accent); }

.meta { font-size: 11px; color: var(--muted); padding: 0 4px; }

.streaming::after {
  content: "▍";
  color: var(--accent);
  animation: blink 1s steps(2, start) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.typing { display: flex; gap: 4px; padding: 4px 2px; }
.typing i {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--muted);
  animation: bounce 1.2s infinite;
}
.typing i:nth-child(2) { animation-delay: .15s; }
.typing i:nth-child(3) { animation-delay: .3s; }
@keyframes bounce { 0%, 60%, 100% { transform: translateY(0); opacity: .5; } 30% { transform: translateY(-4px); opacity: 1; } }

.steps { display: flex; flex-direction: column; gap: 6px; margin-top: 2px; }
.step {
  font-size: 12.5px;
  color: var(--muted);
  border-left: 2px solid var(--line);
  padding: 2px 0 2px 8px;
  display: flex;
  gap: 6px;
  align-items: baseline;
}
.step .tool { color: var(--accent); font-weight: 600; }
.step.failed { border-left-color: var(--err); color: var(--err); }
.step.done { border-left-color: var(--ok); }
.step details { display: inline; }
.step summary { cursor: pointer; color: var(--muted); }
.step pre { max-height: 220px; overflow: auto; }

.bubble.error { border-color: var(--err); color: var(--err); }

/* ---------- composer ---------- */
.composer {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  padding: 8px 10px calc(8px + var(--safe-b));
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px);
}

/* Model chip sits with the composer so switching models is one tap from typing. */
.chip {
  flex: 0 0 auto;
  align-self: flex-end;
  max-width: 34vw;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  height: 42px;
  padding: 0 12px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.chip.on {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  background: color-mix(in srgb, var(--accent) 12%, var(--panel));
}

/* ---------- model picker ---------- */
.models-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 46dvh;
  overflow-y: auto;
  padding-right: 2px;
}
.models-group {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  text-transform: none;
  margin-top: 6px;
}
.model-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.model-item.on {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, var(--panel));
}
.model-item.ghost-item {
  color: var(--muted);
  background: transparent;
  justify-content: center;
  align-items: center;
}
.model-item:disabled { opacity: 0.55; cursor: default; }
.model-name { font-size: 15px; font-weight: 600; }
.model-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
}
.tag.ok { color: #34c759; border-color: color-mix(in srgb, #34c759 40%, transparent); }
.tag.no { color: var(--err); border-color: color-mix(in srgb, var(--err) 35%, transparent); }

.effort-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}
.effort-list { display: flex; gap: 6px; }
.effort-btn {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}
.effort-btn.on {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

.composer textarea {
  flex: 1;
  resize: none;
  max-height: 40dvh;
  min-height: 42px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  font: inherit;
  outline: none;
}
.composer textarea:focus { border-color: var(--accent); }

.send {
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  border: 0;
  border-radius: 14px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  cursor: pointer;
}
.send svg { width: 22px; height: 22px; fill: currentColor; stroke: none; }
.send:disabled { opacity: .45; }
.send.stop { background: var(--err); }
.hidden { display: none !important; }

/* ---------- jump pill ---------- */
.jump {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: calc(78px + var(--safe-b));
  background: var(--accent);
  color: #fff;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 13px;
  box-shadow: 0 6px 18px rgba(0,0,0,.3);
  z-index: 20;
  cursor: pointer;
}

/* ---------- drawer ---------- */
.drawer { position: fixed; inset: 0; z-index: 40; display: flex; }
.drawer-scrim { flex: 1; background: rgba(0,0,0,.45); }
.drawer-panel {
  width: min(82vw, 320px);
  background: var(--bg-soft);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  padding-top: var(--safe-t);
}
.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 14px 10px;
  border-bottom: 1px solid var(--line);
}
.conv-list { list-style: none; margin: 0; padding: 6px; overflow-y: auto; flex: 1; }
.conv-list li {
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.conv-list li:active { background: var(--accent-soft); }
.conv-list li.active { background: var(--accent-soft); }
.conv-list .t { font-size: 14.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conv-list .s { font-size: 11.5px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conv-list .running { color: var(--warn); }
.drawer-foot { padding: 10px 14px calc(12px + var(--safe-b)); border-top: 1px solid var(--line); font-size: 11px; }

/* ---------- sheets ---------- */
.sheet {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(4, 8, 20, .72);
  display: grid;
  place-items: center;
  padding: 16px;
}
.sheet-card {
  width: 100%;
  max-width: 420px;
  max-height: 88dvh;
  overflow-y: auto;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.sheet-card h2 { margin: 0; font-size: 18px; }
.sheet-card label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
.sheet-card input {
  padding: 11px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  font: inherit;
}
.primary, .ghost {
  padding: 12px;
  border-radius: 12px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.primary { background: var(--accent); color: #fff; }
.ghost { background: transparent; border-color: var(--line); color: var(--text); font-weight: 500; }
.ghost.danger { color: var(--err); border-color: color-mix(in srgb, var(--err) 40%, transparent); }
.muted { color: var(--muted); font-size: 13px; margin: 0; }
.err { color: var(--err); font-size: 13px; margin: 0; }

/* 登录页的「或」分隔线：密码与配对码二选一 */
.or-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
}
.or-divider::before,
.or-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--line);
}
#login-code {
  letter-spacing: 3px;
  text-transform: uppercase;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.kv { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; margin: 0; font-size: 13px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; word-break: break-all; }
.out {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  font-size: 12px;
  max-height: 240px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
}

/* ---------- pairing ---------- */
.pair-card select {
  padding: 11px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  font: inherit;
}

.pair-qr {
  /* White backing keeps the symbol scannable in dark mode, but it must hug the
     code rather than span the whole card. */
  display: flex;
  justify-content: center;
  padding: 0;
  background: none;
  border-radius: 14px;
}
.pair-qr:empty { display: none; }
.pair-qr svg {
  /* The SVG carries its own width/height attributes, so constrain both axes
     explicitly or a large symbol overflows the card. */
  width: min(70vw, 280px) !important;
  height: auto !important;
  max-width: 100%;
  display: block;
  padding: 12px;
  background: #fff;
  border-radius: 14px;
}

/* 手输兜底：6 位配对码 */
.pair-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 7px;
  text-align: center;
  padding: 10px 0 4px;
  color: var(--text);
  user-select: all;
}

.pair-actions { display: flex; gap: 8px; }
.pair-actions button { flex: 1; }

@media (min-width: 720px) {
  .msg { max-width: 76%; }
}