:root {
  --bg: #0b0b0c;
  --ink: #ededea;
  --dim: #85857f;
  --faint: #4a4a47;
  --line: #222224;
  --raise: #141415;
  --accent: #c8ff2e;
  --on-accent: #0b0b0c;
  --warn: #ff5a36;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f3f2ed;
    --ink: #111110;
    --dim: #6c6b65;
    --faint: #b3b1a8;
    --line: #dcdad1;
    --raise: #eae8e1;
    --accent: #111110;
    --on-accent: #f3f2ed;
    --warn: #c7340f;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
[hidden] { display: none !important; }
:focus-visible { outline: 1px solid var(--accent); outline-offset: 2px; }

.mark { font: 600 13px/1 var(--mono); letter-spacing: .42em; }
.label { display: block; font: 11px/1 var(--mono); letter-spacing: .14em; color: var(--dim); text-transform: uppercase; }
.error { min-height: 1.4em; margin: 0; font-size: 13px; color: var(--warn); }

/* ---------- 按钮 ---------- */
.btn {
  border: 1px solid var(--faint);
  background: none;
  padding: 9px 16px;
  border-radius: 2px;
  font: 13px/1.2 var(--mono);
  letter-spacing: .04em;
  transition: border-color .12s, background .12s, color .12s;
}
.btn:hover { border-color: var(--ink); }
.btn.solid, .btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); font-weight: 600; }
.btn.danger { border-color: var(--warn); color: var(--warn); }
.btn:disabled { cursor: default; background: none; border-color: var(--line); color: var(--faint); font-weight: 400; }
.btn.picked { border-color: var(--ink); color: var(--ink); }
.text-btn { border: 0; background: none; padding: 6px 0; font: 12px/1 var(--mono); letter-spacing: .06em; color: var(--dim); }
.text-btn:hover { color: var(--ink); }
.icon-btn {
  width: 40px; height: 40px; flex: none;
  border: 1px solid var(--line); border-radius: 2px; background: none;
  font: 18px/1 var(--mono);
}
.icon-btn.solid { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.icon-btn:disabled { opacity: .3; cursor: default; }

/* ---------- 登录 ---------- */
.login { min-height: 100%; display: grid; place-items: center; padding: 24px; }
.login-box { width: min(340px, 100%); display: grid; gap: 14px; }
.login-box .mark { font-size: 22px; margin-bottom: 36px; }
.login-box input {
  width: 100%; padding: 12px 0; border: 0; border-bottom: 1px solid var(--faint); border-radius: 0;
  background: none; font: 16px/1.2 var(--mono); outline: none;
}
.login-box input:focus { border-bottom-color: var(--accent); }
.login-box .btn { justify-self: start; margin-top: 10px; }

/* ---------- 骨架 ---------- */
.app { height: 100%; display: grid; grid-template-columns: 300px minmax(0, 1fr); }
.rail { display: flex; flex-direction: column; min-height: 0; border-right: 1px solid var(--line); }
.rail-head { display: flex; align-items: center; justify-content: space-between; padding: 22px 20px 20px; }
.close-menu { display: none; }
.rail-head .mark { flex: 1; }
.rail-head { gap: 14px; }
.link { width: 7px; height: 7px; border-radius: 50%; background: var(--faint); }
.link.on { background: var(--accent); box-shadow: 0 0 10px var(--accent); }
.agents { flex: 1; overflow-y: auto; padding: 4px 0 20px; }
.rail-foot { padding: 14px 20px calc(14px + env(safe-area-inset-bottom)); border-top: 1px solid var(--line); }

.machine { padding: 18px 20px 6px; font: 11px/1 var(--mono); letter-spacing: .16em; color: var(--dim); text-transform: uppercase; }
.node {
  display: flex; align-items: center; gap: 10px; width: 100%;
  padding: 9px 20px; border: 0; background: none; text-align: left;
  font: 14px/1.3 var(--mono);
}
.node:hover, .chat:hover { background: var(--raise); }
.node .dot { width: 6px; height: 6px; border-radius: 50%; flex: none; background: var(--faint); }
.node.online .dot { background: var(--accent); }
.node.offline { color: var(--dim); }
.node .name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.node .forget { font-size: 11px; color: var(--dim); visibility: hidden; }
.node.offline:hover .forget { visibility: visible; }
.node.active { color: var(--ink); }
.node.active .name::after { content: " ·"; color: var(--accent); }

.chats { padding: 2px 0 8px; }
.chat {
  display: block; width: 100%; padding: 7px 20px 7px 36px; border: 0; background: none; text-align: left;
  font-size: 13.5px; line-height: 1.35; color: var(--dim);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.chat.active { color: var(--ink); box-shadow: inset 2px 0 0 var(--accent); }
.chat.new { font: 12px/1.35 var(--mono); letter-spacing: .04em; }
.none { padding: 28px 20px; font-size: 13px; line-height: 1.7; color: var(--dim); }

.stage { display: flex; flex-direction: column; min-width: 0; min-height: 0; height: 100%; }
.bar { display: flex; align-items: center; gap: 12px; padding: 14px 24px; min-height: 64px; border-bottom: 1px solid var(--line); }
.bar #menu { display: none; }
.bar-title { flex: 1; min-width: 0; }
.title { font-size: 15px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sub { font: 11px/1.5 var(--mono); letter-spacing: .06em; color: var(--dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.scroll { flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch; }
.empty { padding: 15vh 24px 0; max-width: 760px; margin: 0 auto; }
.empty .big { font: 600 clamp(28px, 6vw, 52px)/1.15 var(--mono); letter-spacing: -.02em; }
.empty .hint { margin-top: 18px; color: var(--dim); font-size: 14px; max-width: 46ch; }

/* ---------- 消息 ---------- */
.messages { max-width: 760px; margin: 0 auto; padding: 28px 24px 8px; }
.msg { display: grid; grid-template-columns: 52px minmax(0, 1fr); gap: 0 14px; padding: 12px 0; align-items: start; }
.who { padding-top: 5px; font: 11px/1 var(--mono); letter-spacing: .12em; color: var(--dim); text-transform: uppercase; }
.msg.user .who { color: var(--accent); }
.msg.user .body { color: var(--dim); }
.body { min-width: 0; overflow-wrap: anywhere; }
.body p { margin: 0 0 .7em; white-space: pre-wrap; }
.body p:last-child { margin-bottom: 0; }
.body h4 { margin: .9em 0 .4em; font-size: 15px; }
.body code { font: .88em var(--mono); padding: 1px 5px; background: var(--raise); border: 1px solid var(--line); border-radius: 2px; }
.body pre {
  margin: .5em 0 .9em; padding: 12px 14px; overflow-x: auto;
  background: var(--raise); border: 1px solid var(--line); border-radius: 2px;
  font: 13px/1.55 var(--mono);
}
.body pre code { padding: 0; border: 0; background: none; font-size: 1em; }
.body em { font-style: normal; font: 12px/1.6 var(--mono); color: var(--dim); }
.body hr { border: 0; border-top: 1px solid var(--line); margin: 12px 0; }
.body .note { font-size: 12.5px; color: var(--dim); }
.body .card-title { font: 600 12px/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; margin-bottom: 8px; }
.card { border-left: 1px solid var(--faint); padding-left: 14px; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 4px; }
.item { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 5px 0; }
.body select { background: var(--bg); border: 1px solid var(--faint); border-radius: 2px; padding: 8px 10px; max-width: 100%; }
.chose { margin-top: 6px; font: 11px/1 var(--mono); letter-spacing: .08em; color: var(--dim); }

.typing { max-width: 760px; margin: 0 auto; padding: 0 24px 20px 90px; }
.caret { display: inline-block; width: 8px; height: 17px; background: var(--accent); animation: blink 1s steps(2, start) infinite; }
@keyframes blink { to { visibility: hidden; } }
@media (prefers-reduced-motion: reduce) { .caret { animation: none; } }

/* ---------- 输入 ---------- */
.composer {
  display: flex; align-items: flex-end; gap: 12px;
  max-width: 808px; width: 100%; margin: 0 auto;
  padding: 14px 24px calc(18px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
}
.prompt { font: 22px/40px var(--mono); color: var(--accent); }
.composer textarea {
  flex: 1; min-height: 40px; max-height: 220px; resize: none;
  padding: 8px 0; border: 0; background: none; outline: none; line-height: 1.5;
}
.composer textarea::placeholder { color: var(--faint); }

.toast {
  position: fixed; left: 50%; bottom: calc(96px + env(safe-area-inset-bottom)); transform: translateX(-50%);
  max-width: calc(100vw - 32px); padding: 10px 16px;
  background: var(--ink); color: var(--bg); border-radius: 2px;
  font: 13px/1.4 var(--mono);
}

/* ---------- 窄屏：列表变成整屏抽屉 ---------- */
@media (max-width: 820px) {
  .app { grid-template-columns: minmax(0, 1fr); }
  .rail { position: fixed; inset: 0; z-index: 10; background: var(--bg); border-right: 0; transform: translateX(-100%); transition: transform .18s ease; padding-top: env(safe-area-inset-top); }
  .app.menu-open .rail { transform: none; }
  .bar { padding: 10px 16px; padding-top: calc(10px + env(safe-area-inset-top)); }
  .bar #menu { display: block; }
  .close-menu { display: block; }
  .messages { padding: 20px 16px 8px; }
  .msg { grid-template-columns: minmax(0, 1fr); }
  .who { padding: 0 0 6px; }
  .typing { padding-left: 16px; }
  .composer { padding-left: 16px; padding-right: 16px; }
  .empty { padding: 12vh 16px 0; }
  .node, .machine { padding-left: 24px; padding-right: 24px; }
  .node { padding-top: 13px; padding-bottom: 13px; font-size: 15px; }
  .chat { padding: 11px 24px 11px 40px; font-size: 14.5px; }
  .rail-head { padding: 22px 24px; }
}
@media (prefers-reduced-motion: reduce) { .rail { transition: none; } }

/* ---------- 附件 ---------- */
.attachments { display: flex; flex-wrap: wrap; gap: 10px; margin: 6px 0 2px; }
.shot { display: block; max-width: min(100%, 420px); border: 1px solid var(--line); border-radius: 2px; overflow: hidden; line-height: 0; }
.shot img { display: block; max-width: 100%; max-height: 420px; min-width: 48px; min-height: 48px; height: auto; object-fit: contain; }
.attachments audio { width: min(100%, 360px); height: 40px; }
.file {
  display: inline-flex; align-items: baseline; gap: 12px; max-width: 100%;
  padding: 10px 14px; border: 1px solid var(--faint); border-radius: 2px;
  color: inherit; text-decoration: none; font: 13px/1.3 var(--mono);
}
.file:hover { border-color: var(--ink); }
.file-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-size { flex: none; color: var(--dim); font-size: 11px; }
.pending { display: flex; flex-wrap: wrap; gap: 8px; max-width: 808px; width: 100%; margin: 0 auto; padding: 10px 24px 0; }
.chip { display: inline-flex; align-items: center; gap: 8px; max-width: 240px; padding: 5px 6px 5px 10px; border: 1px solid var(--faint); border-radius: 2px; font: 12px/1.3 var(--mono); }
.chip-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chip-x { border: 0; background: none; padding: 0 4px; font-size: 15px; line-height: 1; color: var(--dim); }
.chip.busy { color: var(--dim); border-style: dashed; padding-right: 10px; }
.rail-foot { display: flex; justify-content: space-between; gap: 12px; }
@media (max-width: 820px) { .pending { padding: 10px 16px 0; } }

/* =====================================================================
   圆润外观（data-theme="soft"）：参考 iOS / macOS
   系统字体、大圆角、对话气泡、分组列表、半透明顶栏。上面的基础样式是「锐利」外观。
   ===================================================================== */
:root[data-theme="soft"] {
  --bg: #000000;
  --ink: #ffffff;
  --dim: #98989f;
  --faint: #48484a;
  --line: rgba(84, 84, 88, .48);
  --raise: #1c1c1e;
  --raise-2: #2c2c2e;
  --accent: #0a84ff;
  --on-accent: #ffffff;
  --warn: #ff453a;
  --bar: rgba(22, 22, 24, .72);
}
@media (prefers-color-scheme: light) {
  :root[data-theme="soft"] {
    --bg: #f2f2f7;
    --ink: #000000;
    --dim: #6c6c70;
    --faint: #c7c7cc;
    --line: rgba(60, 60, 67, .16);
    --raise: #ffffff;
    --raise-2: #e9e9ee;
    --accent: #007aff;
    --on-accent: #ffffff;
    --warn: #ff3b30;
    --bar: rgba(249, 249, 251, .78);
  }
}
[data-theme="soft"] body { font-size: 16px; line-height: 1.5; letter-spacing: -.01em; }
[data-theme="soft"] :focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent); outline-offset: 1px; }
[data-theme="soft"] .mark { font: 700 20px/1 var(--sans); letter-spacing: -.02em; text-transform: none; }
[data-theme="soft"] .label { font: 600 13px/1 var(--sans); letter-spacing: 0; text-transform: none; }

[data-theme="soft"] .btn {
  border: 0; border-radius: 999px; padding: 9px 18px;
  background: var(--raise-2); font: 600 15px/1.2 var(--sans); letter-spacing: 0;
}
[data-theme="soft"] .btn:hover { filter: brightness(1.08); }
[data-theme="soft"] .btn.solid, [data-theme="soft"] .btn.primary { background: var(--accent); color: var(--on-accent); }
[data-theme="soft"] .btn.danger { background: color-mix(in srgb, var(--warn) 16%, transparent); color: var(--warn); }
[data-theme="soft"] .btn:disabled { background: var(--raise-2); color: var(--faint); filter: none; }
[data-theme="soft"] .btn.picked { background: var(--raise-2); color: var(--ink); box-shadow: inset 0 0 0 2px var(--accent); }
[data-theme="soft"] .text-btn { font: 15px/1 var(--sans); letter-spacing: 0; color: var(--accent); }
[data-theme="soft"] .text-btn:hover { color: var(--accent); opacity: .7; }
[data-theme="soft"] .icon-btn { border: 0; border-radius: 50%; width: 36px; height: 36px; background: var(--raise-2); font: 600 18px/1 var(--sans); }
[data-theme="soft"] .icon-btn.solid { background: var(--accent); color: var(--on-accent); }

[data-theme="soft"] .login-box { padding: 32px 28px; border-radius: 24px; background: var(--raise); width: min(360px, 100%); }
[data-theme="soft"] .login-box .mark { font-size: 30px; margin-bottom: 22px; }
[data-theme="soft"] .login-box input { padding: 13px 16px; border: 0; border-radius: 12px; background: var(--raise-2); font: 17px/1.2 var(--sans); }
[data-theme="soft"] .login-box input:focus { box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 40%, transparent); }
[data-theme="soft"] .login-box .btn { justify-self: stretch; padding: 13px; font-size: 17px; border-radius: 12px; }

[data-theme="soft"] .rail { border-right: 1px solid var(--line); background: color-mix(in srgb, var(--raise) 55%, var(--bg)); }
[data-theme="soft"] .rail-head { padding: 22px 20px 12px; }
[data-theme="soft"] .link { width: 9px; height: 9px; }
[data-theme="soft"] .link.on { background: #30d158; box-shadow: none; }
[data-theme="soft"] .machine { padding: 20px 22px 8px; font: 600 13px/1 var(--sans); letter-spacing: 0; text-transform: none; }
[data-theme="soft"] .node { width: auto; margin: 2px 10px; padding: 10px 12px; border-radius: 12px; font: 600 16px/1.3 var(--sans); }
[data-theme="soft"] .node { width: calc(100% - 20px); }
[data-theme="soft"] .node .dot { width: 9px; height: 9px; }
[data-theme="soft"] .node.online .dot { background: #30d158; }
[data-theme="soft"] .node.active .name::after { content: ""; }
[data-theme="soft"] .node.active { background: var(--raise-2); }
[data-theme="soft"] .chats { padding: 2px 0 10px; }
[data-theme="soft"] .chat { width: calc(100% - 20px); margin: 1px 10px; padding: 8px 12px 8px 32px; border-radius: 10px; font-size: 15px; color: var(--ink); }
[data-theme="soft"] .chat.active { background: var(--accent); color: var(--on-accent); box-shadow: none; }
[data-theme="soft"] .chat.new { font: 15px/1.35 var(--sans); letter-spacing: 0; color: var(--accent); }
[data-theme="soft"] .rail-foot { border-top: 0; padding: 12px 22px calc(16px + env(safe-area-inset-bottom)); }

[data-theme="soft"] .bar {
  border-bottom: 1px solid var(--line); background: var(--bar);
  -webkit-backdrop-filter: saturate(180%) blur(20px); backdrop-filter: saturate(180%) blur(20px);
}
[data-theme="soft"] .title { font-size: 17px; letter-spacing: -.02em; }
[data-theme="soft"] .sub { font: 13px/1.4 var(--sans); letter-spacing: 0; }
[data-theme="soft"] .empty .big { font: 700 clamp(30px, 6vw, 44px)/1.12 var(--sans); letter-spacing: -.03em; }
[data-theme="soft"] .empty .hint { font-size: 16px; }

/* 气泡 */
[data-theme="soft"] .messages { padding-top: 22px; }
[data-theme="soft"] .msg { display: flex; flex-direction: column; align-items: flex-start; padding: 3px 0; }
[data-theme="soft"] .msg.user { align-items: flex-end; margin-top: 10px; }
[data-theme="soft"] .who { display: none; }
[data-theme="soft"] .body { max-width: min(86%, 620px); padding: 9px 14px; border-radius: 20px; background: var(--raise); }
[data-theme="soft"] .msg.agent .body { border-bottom-left-radius: 6px; }
[data-theme="soft"] .msg .body.bare { padding: 0; background: none; border-radius: 0; }
[data-theme="soft"] .body.bare .attachments { margin: 2px 0; }
[data-theme="soft"] .msg.user .body.bare .file { background: var(--accent); }
[data-theme="soft"] .msg.user .body { background: var(--accent); color: var(--on-accent); border-bottom-right-radius: 6px; }
[data-theme="soft"] .body code { border: 0; border-radius: 6px; background: var(--raise-2); }
[data-theme="soft"] .msg.user .body code { background: rgba(255, 255, 255, .22); }
[data-theme="soft"] .body pre { border: 0; border-radius: 12px; background: var(--raise-2); }
[data-theme="soft"] .body em { font: 12px/1.5 var(--sans); }
[data-theme="soft"] .card { border-left: 0; padding-left: 0; }
[data-theme="soft"] .body .card-title { font: 600 13px/1.4 var(--sans); letter-spacing: 0; text-transform: none; color: var(--dim); }
[data-theme="soft"] .body select { border: 0; border-radius: 10px; background: var(--raise-2); }
[data-theme="soft"] .chose { font: 12px/1 var(--sans); letter-spacing: 0; }
[data-theme="soft"] .shot { border: 0; border-radius: 14px; }
[data-theme="soft"] .file { border: 0; border-radius: 12px; background: var(--raise-2); font: 15px/1.3 var(--sans); }
[data-theme="soft"] .msg.user .file { background: rgba(255, 255, 255, .2); }
[data-theme="soft"] .msg.user .file-size { color: rgba(255, 255, 255, .75); }
[data-theme="soft"] .file-size { font-size: 13px; }
[data-theme="soft"] .typing { padding-left: 24px; }
[data-theme="soft"] .caret { width: 44px; height: 30px; border-radius: 16px; background: var(--raise); animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .45; } }

/* 输入区 */
[data-theme="soft"] .composer {
  align-items: flex-end; gap: 8px; border-top: 1px solid var(--line); background: var(--bar);
  -webkit-backdrop-filter: saturate(180%) blur(20px); backdrop-filter: saturate(180%) blur(20px);
  max-width: none; padding: 10px max(16px, calc((100% - 760px) / 2)) calc(12px + env(safe-area-inset-bottom));
}
[data-theme="soft"] .prompt { display: none; }
[data-theme="soft"] .composer textarea { min-height: 36px; padding: 7px 14px; border-radius: 18px; background: var(--raise); border: 1px solid var(--line); line-height: 1.35; }
[data-theme="soft"] .pending { max-width: none; padding: 10px max(16px, calc((100% - 760px) / 2)) 0; }
[data-theme="soft"] .chip { border: 0; border-radius: 999px; background: var(--raise-2); font: 13px/1.3 var(--sans); padding: 6px 8px 6px 12px; }
[data-theme="soft"] .toast { border-radius: 14px; font: 15px/1.4 var(--sans); padding: 12px 18px; }
[data-theme="soft"] .none { font-size: 15px; }

@media (max-width: 820px) {
  [data-theme="soft"] .rail { background: var(--bg); }
  [data-theme="soft"] .typing { padding-left: 16px; }
  [data-theme="soft"] .body { max-width: 90%; }
}
@media (prefers-reduced-motion: reduce) { [data-theme="soft"] .caret { animation: none; } }