:root {
  --bg: #eae6df;
  --panel: #ffffff;
  --panel-2: #f0f2f5;
  --hover: #f5f6f6;
  --selected: #e9edef;
  --border: #e9edef;
  --text: #111b21;
  --text-2: #667781;
  --accent: #00a884;
  --accent-text: #ffffff;
  --link: #027eb5;
  --chat-bg: #efeae2;
  --in: #ffffff;
  --out: #d9fdd3;
  --day: #ffffff;
  --remark: #008069;
  --danger: #ea0038;
  --mark: #fff3a3;
  --highlight: #fff59d;
  --avatar: #dfe5e7;
  --avatar-text: #54656f;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1317;
    --panel: #111b21;
    --panel-2: #202c33;
    --hover: #202c33;
    --selected: #2a3942;
    --border: #222d34;
    --text: #e9edef;
    --text-2: #8696a0;
    --accent: #00a884;
    --accent-text: #111b21;
    --link: #53bdeb;
    --chat-bg: #0b141a;
    --in: #202c33;
    --out: #005c4b;
    --day: #182229;
    --remark: #00a884;
    --danger: #f15c6d;
    --mark: #5c4b00;
    --highlight: #3d4a00;
    --avatar: #6a7175;
    --avatar-text: #e9edef;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", Helvetica, Arial, sans-serif;
}

button, .button, input, select {
  font: inherit;
  color: inherit;
}
button, .button {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
button:hover, .button:hover { background: var(--hover); }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
button.primary:hover { filter: brightness(0.95); }
button.ghost { border-color: transparent; background: transparent; }
button.danger { color: var(--danger); }
button:disabled { opacity: 0.5; cursor: default; }

input, select {
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  min-width: 0;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.error { color: var(--danger); min-height: 1.2em; margin: 0; font-size: 13px; }
.hint { color: var(--text-2); font-size: 13px; }

/* ---- login ---- */
.login { height: 100%; display: flex; align-items: center; justify-content: center; padding: 16px; }
.login-card {
  width: 100%; max-width: 340px; background: var(--panel); border-radius: 12px; padding: 32px 28px;
  display: flex; flex-direction: column; gap: 14px; text-align: center;
}
.login-card img { margin: 0 auto; }
.login-card h1 { margin: 0 0 8px; font-size: 22px; font-weight: 500; }
.login-card label { display: flex; flex-direction: column; gap: 4px; text-align: left; color: var(--text-2); font-size: 13px; }
.login-card button { justify-content: center; padding: 9px; }

/* ---- layout ---- */
.app { height: 100%; display: flex; flex-direction: column; }
.topbar {
  display: flex; align-items: center; gap: 10px; padding: 8px 14px; flex-wrap: wrap;
  background: var(--panel-2); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 8px; font-size: 16px; font-weight: 500; margin-right: 6px; }
.field { display: flex; align-items: center; gap: 6px; color: var(--text-2); font-size: 13px; }
.field select { max-width: 220px; color: var(--text); }
.search { display: flex; flex: 1 1 280px; max-width: 460px; }
.search select { border-radius: 8px 0 0 8px; border-right: 0; }
.search input { flex: 1; border-radius: 0 8px 8px 0; }
.spacer { flex: 1; }

.panes { flex: 1; display: grid; grid-template-columns: minmax(280px, 30%) minmax(0, 1fr); min-height: 0; }
.sidebar { display: flex; flex-direction: column; background: var(--panel); border-right: 1px solid var(--border); min-height: 0; }
.sidebar-head { padding: 8px 12px; border-bottom: 1px solid var(--border); }
.sidebar-head input { width: 100%; background: var(--panel-2); border-color: transparent; }
.search-head { display: flex; align-items: center; justify-content: space-between; padding: 6px 8px; border-bottom: 1px solid var(--border); color: var(--text-2); font-size: 13px; }
.chat-list { flex: 1; overflow-y: auto; }
.chat-list .none { padding: 24px 16px; color: var(--text-2); text-align: center; }

.item { display: flex; gap: 12px; padding: 10px 14px; cursor: pointer; align-items: center; border-bottom: 1px solid var(--border); }
.item:hover { background: var(--hover); }
.item.active { background: var(--selected); }
.item .body { flex: 1; min-width: 0; }
.item .line { display: flex; justify-content: space-between; gap: 8px; align-items: baseline; }
.item .title { font-size: 15px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item .time { font-size: 12px; color: var(--text-2); flex: none; }
.item .remark { font-size: 12px; color: var(--remark); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item .preview { font-size: 13px; color: var(--text-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item .where { font-size: 12px; color: var(--text-2); }
.item mark { background: var(--mark); color: inherit; }

.avatar {
  width: 44px; height: 44px; border-radius: 50%; flex: none; display: flex; align-items: center; justify-content: center;
  background: var(--avatar); color: var(--avatar-text); font-size: 15px;
}

/* ---- conversation ---- */
.conversation { display: flex; flex-direction: column; min-height: 0; background: var(--chat-bg); }
.empty { margin: auto; text-align: center; color: var(--text-2); padding: 24px; }
.empty h2 { color: var(--text); font-weight: 400; margin: 16px 0 4px; }
.chat { flex: 1; display: flex; flex-direction: column; min-height: 0; }
.chat-head {
  display: flex; align-items: center; gap: 12px; padding: 8px 16px; background: var(--panel-2);
  border-bottom: 1px solid var(--border); flex-wrap: wrap;
}
.chat-head .avatar { width: 40px; height: 40px; }
.chat-head .back { display: none; padding: 6px 8px; }
.chat-title { flex: 1; min-width: 160px; }
.chat-title .name { font-size: 16px; }
.chat-title .sub { font-size: 12px; color: var(--text-2); }
.chat-title .remark { font-size: 12px; color: var(--remark); }
.jump input { padding: 4px 8px; }

.messages { flex: 1; overflow-y: auto; padding: 12px 6% 20px; display: flex; flex-direction: column; }
.messages .loading { align-self: center; color: var(--text-2); font-size: 12px; padding: 6px; }
.day {
  align-self: center; margin: 10px 0 6px; padding: 4px 12px; border-radius: 8px; background: var(--day);
  color: var(--text-2); font-size: 12px; box-shadow: 0 1px 0.5px rgba(11, 20, 26, 0.13);
}
.bubble {
  position: relative; max-width: min(65%, 560px); margin: 2px 0; padding: 6px 9px 4px; border-radius: 8px;
  box-shadow: 0 1px 0.5px rgba(11, 20, 26, 0.13); overflow-wrap: anywhere; white-space: pre-wrap;
}
.bubble.in { align-self: flex-start; background: var(--in); border-top-left-radius: 0; }
.bubble.out { align-self: flex-end; background: var(--out); border-top-right-radius: 0; }
.bubble.flash { animation: flash 2.4s ease-out; }
@keyframes flash { 0%, 40% { background: var(--highlight); } }
.bubble .extra {
  margin-top: 4px; padding-top: 4px; border-top: 1px dashed rgba(134, 150, 160, 0.5);
  color: var(--text-2); font-size: 13px;
}
.bubble .extra b { font-weight: 500; }
.bubble .meta { float: right; margin: 6px 0 -2px 12px; font-size: 11px; color: var(--text-2); white-space: nowrap; }
.bubble .meta .ack.read { color: var(--link); }
.bubble .tag { display: inline-block; font-size: 12px; color: var(--text-2); margin-bottom: 2px; }
.bubble .revoked { color: var(--danger); font-size: 12px; margin-bottom: 2px; }
.bubble.is-revoked .text { text-decoration: line-through; color: var(--text-2); }
.bubble details { font-size: 12px; color: var(--text-2); margin-top: 2px; }
.bubble details summary { cursor: pointer; }
.bubble img.photo { display: block; max-width: 100%; max-height: 320px; border-radius: 6px; cursor: zoom-in; margin-bottom: 2px; }
.bubble img.sticker { max-width: 140px; max-height: 140px; }
.bubble audio { display: block; width: 260px; max-width: 100%; height: 36px; }
.bubble .file { display: flex; gap: 6px; align-items: center; padding: 6px 8px; border-radius: 6px; background: rgba(134, 150, 160, 0.12); }
.bubble .missing { color: var(--text-2); font-style: italic; }

/* ---- dialog ---- */
.manage {
  width: min(820px, calc(100vw - 32px)); max-height: calc(100vh - 48px); padding: 0; border: 0; border-radius: 12px;
  background: var(--panel); color: var(--text);
}
.manage::backdrop { background: rgba(0, 0, 0, 0.45); }
.manage-head { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; border-bottom: 1px solid var(--border); }
.manage-head nav { display: flex; gap: 4px; flex-wrap: wrap; }
.manage-head nav button { border-color: transparent; background: transparent; }
.manage-head nav button.active { background: var(--selected); }
.manage-body { padding: 16px 18px 22px; overflow-y: auto; max-height: calc(100vh - 120px); }
.row { display: flex; gap: 8px; }
.row.wrap { flex-wrap: wrap; }
.row.wrap input { flex: 1 1 160px; }
.row input { flex: 1; }
.stack { display: flex; flex-direction: column; gap: 12px; max-width: 360px; }
.stack label { display: flex; flex-direction: column; gap: 4px; color: var(--text-2); font-size: 13px; }

.agent { border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; margin-top: 12px; }
.agent.disabled { opacity: 0.6; }
.agent-top { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.agent-top .name { font-size: 15px; font-weight: 500; }
.agent-top .state { font-size: 12px; color: var(--text-2); }
.agent-top .actions { margin-left: auto; display: flex; gap: 6px; flex-wrap: wrap; }
.code { font: 500 16px/1 ui-monospace, Consolas, monospace; letter-spacing: 2px; padding: 4px 8px; border-radius: 6px; background: var(--panel-2); user-select: all; }
.accounts { width: 100%; margin-top: 8px; border-collapse: collapse; font-size: 13px; }
.accounts td { padding: 4px 6px; border-top: 1px solid var(--border); }
.accounts .stale { color: var(--danger); }

table.list { width: 100%; border-collapse: collapse; font-size: 13px; }
table.list th, table.list td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border); vertical-align: top; }
table.list th { color: var(--text-2); font-weight: 400; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.stat { background: var(--panel-2); border-radius: 10px; padding: 14px; }
.stat .label { color: var(--text-2); font-size: 13px; }
.stat .value { font-size: 22px; margin-top: 2px; }

.viewer {
  position: fixed; inset: 0; background: rgba(0, 0, 0, 0.85); display: flex; align-items: center;
  justify-content: center; cursor: zoom-out; z-index: 10; padding: 24px;
}
.viewer img { max-width: 100%; max-height: 100%; }
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 20;
  background: var(--text); color: var(--panel); padding: 8px 16px; border-radius: 8px; font-size: 13px;
}

@media (max-width: 760px) {
  .panes { grid-template-columns: 1fr; }
  .panes.has-chat .sidebar { display: none; }
  .panes:not(.has-chat) .conversation { display: none; }
  .chat-head .back { display: inline-flex; }
  .messages { padding: 10px 10px 16px; }
  .bubble { max-width: 85%; }
}