:root {
  --bg: #ffffff;
  --bg-2: #f6f6f8;
  --bg-3: #ececf0;
  --side: #f2f2f5;
  --fg: #1d1d22;
  --fg-2: #5c5c66;
  --fg-3: #8c8c96;
  --line: #e2e2e8;
  --line-2: #d2d2da;
  --accent: #0a66d8;
  --accent-soft: #e6effc;
  --accent-fg: #ffffff;
  --sel: #dbe8fb;
  --note: #fff8db;
  --note-line: #f0dc8c;
  --danger: #c62828;
  --ok: #1f8a4c;
  --warn: #b26a00;
  --shadow: 0 8px 30px rgba(0,0,0,.14);
  --radius: 8px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "Noto Sans Bengali", "Hind Siliguri", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1e1e22;
    --bg-2: #26262b;
    --bg-3: #303037;
    --side: #222227;
    --fg: #ececf1;
    --fg-2: #b0b0ba;
    --fg-3: #7d7d88;
    --line: #34343b;
    --line-2: #44444d;
    --accent: #3d8bff;
    --accent-soft: #23324a;
    --accent-fg: #ffffff;
    --sel: #2a3b57;
    --note: #3a3420;
    --note-line: #5c5130;
    --danger: #ff6b6b;
    --ok: #4ccf86;
    --warn: #f0a640;
    --shadow: 0 8px 30px rgba(0,0,0,.5);
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--fg); font: 13px/1.45 var(--font); -webkit-font-smoothing: antialiased; }
button, input, select, textarea { font: inherit; color: inherit; }
.hidden { display: none !important; }

/* buttons & inputs */
.btn { border: 1px solid var(--line-2); background: var(--bg); color: var(--fg); border-radius: 6px; padding: 5px 12px; cursor: pointer; white-space: nowrap; }
.btn:hover { background: var(--bg-2); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.07); }
.btn.danger { color: var(--danger); }
.btn.small { padding: 3px 9px; font-size: 12px; }
.btn.wide { width: 100%; padding: 9px; }
.btn:disabled { opacity: .5; cursor: default; }
.icon-btn { border: 0; background: transparent; border-radius: 6px; padding: 4px 9px; cursor: pointer; font-size: 15px; color: var(--fg-2); font-weight: 600; }
.icon-btn:hover { background: var(--bg-3); color: var(--fg); }
.icon-btn.on { color: var(--accent); }
input[type=text], input[type=email], input[type=password], input[type=search], input[type=number], input:not([type]), select, textarea {
  border: 1px solid var(--line-2); background: var(--bg); border-radius: 6px; padding: 6px 8px; outline: none; min-width: 0;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
select.small { padding: 2px 6px; font-size: 12px; }
.err-text { color: var(--danger); min-height: 18px; font-size: 12px; }
.muted { color: var(--fg-3); }

/* login */
.login { position: fixed; inset: 0; display: grid; place-items: center; background: var(--bg-2); }
.login-card { width: 320px; background: var(--bg); border: 1px solid var(--line); border-radius: 14px; padding: 28px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 10px; }
.login-card h1 { font-size: 20px; margin: 0 0 6px; text-align: center; }
.login-card label { display: flex; flex-direction: column; gap: 4px; font-weight: 600; font-size: 12px; color: var(--fg-2); }
.login-logo { font-size: 34px; text-align: center; color: var(--accent); }

/* layout */
.app { display: flex; flex-direction: column; height: 100vh; }
.topbar { height: 46px; flex: 0 0 46px; display: flex; align-items: center; gap: 8px; padding: 0 12px; border-bottom: 1px solid var(--line); background: var(--side); -webkit-app-region: drag; }
.topbar > * { -webkit-app-region: no-drag; }
.topbar .drag-zone { width: 64px; flex: 0 0 auto; -webkit-app-region: drag; }
body.web .topbar .drag-zone { width: 0; }
.search { flex: 0 1 460px; }
.search input { width: 100%; border-radius: 7px; background: var(--bg); }
.spacer { flex: 1; -webkit-app-region: drag; }
.avatar { width: 28px; height: 28px; border-radius: 50%; border: 0; background: var(--accent); color: #fff; font-weight: 700; font-size: 12px; cursor: pointer; }
.main { flex: 1; display: flex; min-height: 0; }
.resizer { flex: 0 0 5px; margin: 0 -2px; cursor: col-resize; position: relative; z-index: 3; }
.resizer:hover, .resizer.drag { background: var(--accent); opacity: .35; }

/* sidebar */
.sidebar { width: 210px; flex: 0 0 auto; background: var(--side); border-right: 1px solid var(--line); overflow-y: auto; padding: 8px 6px 20px; }
.nav-title { font-size: 11px; font-weight: 700; color: var(--fg-3); text-transform: uppercase; letter-spacing: .04em; padding: 14px 10px 4px; }
.nav-item { display: flex; align-items: center; gap: 8px; padding: 5px 10px; border-radius: 6px; cursor: pointer; color: var(--fg); user-select: none; }
.nav-item:hover { background: var(--bg-3); }
.nav-item.active { background: var(--sel); font-weight: 600; }
.nav-item .ico { width: 16px; text-align: center; color: var(--fg-2); }
.nav-item .label { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-item .count { font-size: 11px; color: var(--fg-3); }
.nav-item .count.unread { color: var(--accent); font-weight: 700; }
.dot { width: 9px; height: 9px; border-radius: 50%; flex: 0 0 9px; display: inline-block; }
.nav-item .err { color: var(--danger); font-size: 11px; }

/* list */
.list-col { width: 380px; flex: 0 0 auto; display: flex; flex-direction: column; border-right: 1px solid var(--line); min-width: 260px; }
.list-head { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid var(--line); min-height: 40px; flex-wrap: wrap; }
.list-title { font-weight: 700; font-size: 14px; flex: 1; }
.unread-filter { font-size: 12px; color: var(--fg-2); display: flex; gap: 4px; align-items: center; }
.bulk { display: flex; gap: 4px; align-items: center; flex-wrap: wrap; width: 100%; }
.bulk span { font-size: 12px; color: var(--fg-2); margin-right: 4px; }
.ticket-list { flex: 1; overflow-y: auto; outline: none; }
.trow { display: grid; grid-template-columns: 18px 1fr auto; gap: 2px 8px; padding: 8px 12px 8px 8px; border-bottom: 1px solid var(--line); cursor: pointer; position: relative; }
.trow:hover { background: var(--bg-2); }
.trow.sel { background: var(--sel); }
.trow .chk { grid-row: 1 / span 3; align-self: start; margin-top: 2px; opacity: .35; }
.trow:hover .chk, .trow .chk:checked { opacity: 1; }
.trow .who { font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; display: flex; align-items: center; gap: 6px; }
.trow .time { font-size: 11px; color: var(--fg-3); white-space: nowrap; }
.trow .subj { grid-column: 2 / span 2; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.trow .snip { grid-column: 2 / span 2; color: var(--fg-3); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.trow .meta { grid-column: 2 / span 2; display: flex; gap: 4px; flex-wrap: wrap; align-items: center; }
.trow.unread .who, .trow.unread .subj { font-weight: 700; }
.trow.unread::before { content: ""; position: absolute; left: 2px; top: 13px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.trow .star { color: #e3a008; }
.pill { display: inline-flex; align-items: center; gap: 3px; font-size: 10.5px; padding: 0 6px; border-radius: 9px; line-height: 17px; background: var(--bg-3); color: var(--fg-2); white-space: nowrap; }
.pill.tag { color: #fff; }
.pill.status-pending { background: #fdf0d5; color: #8a5a00; }
.pill.status-closed { background: var(--bg-3); color: var(--fg-3); }
.pill.status-spam { background: #fde2e2; color: var(--danger); }
.pill.out { background: var(--accent-soft); color: var(--accent); }
@media (prefers-color-scheme: dark) {
  .pill.status-pending { background: #4a3a14; color: #f5c46b; }
  .pill.status-spam { background: #4a1d1d; color: #ff9a9a; }
}
.list-more { padding: 12px; text-align: center; }
.list-empty { padding: 40px 20px; text-align: center; color: var(--fg-3); }

/* reader */
.reader { flex: 1; min-width: 320px; display: flex; flex-direction: column; overflow: hidden; }
.empty-state { margin: auto; text-align: center; color: var(--fg-3); }
.empty-icon { font-size: 42px; opacity: .4; }
.ticket-view { display: flex; flex-direction: column; height: 100%; }
.t-head { padding: 12px 18px 10px; border-bottom: 1px solid var(--line); }
.t-subject { font-size: 17px; font-weight: 700; margin: 0 0 8px; display: flex; gap: 8px; align-items: baseline; }
.t-subject .tid { color: var(--fg-3); font-weight: 500; font-size: 13px; }
.t-controls { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.t-controls select { padding: 3px 6px; font-size: 12px; }
.t-controls .sep { width: 1px; height: 18px; background: var(--line); margin: 0 2px; }
.tag-chip { display: inline-flex; align-items: center; gap: 4px; padding: 1px 4px 1px 8px; border-radius: 10px; font-size: 11.5px; color: #fff; }
.tag-chip button { border: 0; background: transparent; color: #fff; cursor: pointer; padding: 0 3px; font-size: 12px; opacity: .8; }
.t-body { flex: 1; overflow-y: auto; padding: 14px 18px 24px; background: var(--bg-2); }
.customer-bar { display: flex; gap: 10px; align-items: center; font-size: 12px; color: var(--fg-2); margin-bottom: 10px; flex-wrap: wrap; }
.customer-bar a { color: var(--accent); cursor: pointer; text-decoration: none; }
.msg { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 10px; overflow: hidden; }
.msg.out { border-left: 3px solid var(--accent); }
.msg.note { background: var(--note); border-color: var(--note-line); }
.msg.failed { border-color: var(--danger); }
.msg-head { display: flex; gap: 10px; padding: 10px 14px; cursor: pointer; align-items: flex-start; }
.msg-avatar { width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 13px; flex: 0 0 32px; }
.msg-who { flex: 1; min-width: 0; }
.msg-who .name { font-weight: 600; }
.msg-who .addr { color: var(--fg-3); font-size: 12px; }
.msg-who .to { color: var(--fg-3); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.msg-time { font-size: 12px; color: var(--fg-3); white-space: nowrap; text-align: right; }
.msg-collapsed .msg-content { display: none; }
.msg-collapsed .msg-snip { display: block; }
.msg-snip { display: none; color: var(--fg-3); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.msg-content { padding: 0 14px 12px 56px; }
.msg-text { white-space: pre-wrap; word-wrap: break-word; user-select: text; }
.msg-text .quote { color: var(--fg-3); }
.quote-toggle { font-size: 11px; color: var(--fg-3); border: 1px solid var(--line); background: var(--bg-2); border-radius: 4px; cursor: pointer; padding: 0 6px; margin: 6px 0; }
.msg iframe { width: 100%; border: 0; display: block; background: #fff; border-radius: 4px; min-height: 40px; }
.img-bar { font-size: 12px; background: var(--bg-2); border: 1px solid var(--line); border-radius: 6px; padding: 4px 8px; margin-bottom: 6px; display: flex; gap: 8px; align-items: center; }
.view-toggle { font-size: 11px; color: var(--fg-3); margin-top: 6px; }
.view-toggle a { color: var(--accent); cursor: pointer; }
.atts { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.att { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); border-radius: 6px; padding: 4px 9px; font-size: 12px; background: var(--bg-2); cursor: pointer; text-decoration: none; color: var(--fg); max-width: 260px; }
.att:hover { border-color: var(--accent); }
.att .nm { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.att .sz { color: var(--fg-3); }
.send-err { color: var(--danger); font-size: 12px; padding: 4px 14px 10px 56px; }
.activity { font-size: 11.5px; color: var(--fg-3); margin: 6px 0 0; }
.history { margin-bottom: 10px; font-size: 12px; }
.history summary { cursor: pointer; color: var(--fg-2); }
.history a { color: var(--accent); cursor: pointer; display: block; padding: 2px 0 2px 12px; }

/* composer */
.composer { border-top: 1px solid var(--line); background: var(--bg); padding: 8px 14px 10px; display: flex; flex-direction: column; gap: 6px; }
.composer.collapsed .c-full { display: none; }
.composer .c-row { display: flex; gap: 6px; align-items: center; }
.composer .c-row label { width: 40px; color: var(--fg-3); font-size: 12px; text-align: right; }
.composer .c-row input, .composer .c-row select { flex: 1; padding: 4px 7px; }
.composer textarea { width: 100%; min-height: 130px; height: 160px; resize: vertical; line-height: 1.5; }
.composer .c-tabs { display: flex; gap: 2px; }
.composer .c-tabs button { border: 0; background: transparent; padding: 4px 10px; border-radius: 6px; cursor: pointer; color: var(--fg-2); font-weight: 600; }
.composer .c-tabs button.on { background: var(--bg-3); color: var(--fg); }
.composer.is-note textarea { background: var(--note); }
.composer .c-actions { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.composer .c-actions .spacer { flex: 1; }
.c-files { display: flex; gap: 6px; flex-wrap: wrap; }
.c-file { font-size: 12px; background: var(--bg-2); border: 1px solid var(--line); border-radius: 6px; padding: 2px 4px 2px 8px; display: inline-flex; gap: 4px; align-items: center; }
.c-file button { border: 0; background: transparent; cursor: pointer; color: var(--fg-3); }
.composer-placeholder { border-top: 1px solid var(--line); padding: 10px 14px; display: flex; gap: 8px; background: var(--bg); }
.composer-placeholder input { flex: 1; cursor: text; }
.drop-hint { outline: 2px dashed var(--accent); outline-offset: -4px; }

/* AI column */
.ai-col { width: 340px; flex: 0 0 auto; display: flex; flex-direction: column; border-left: 1px solid var(--line); background: var(--bg); min-width: 240px; }
.ai-head { padding: 10px 12px 8px; border-bottom: 1px solid var(--line); }
.ai-title { font-weight: 700; }
.ai-context { font-size: 12px; color: var(--fg-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ai-asked { font-size: 12px; color: var(--fg-3); padding: 8px 12px 0; }
.ai-out { flex: 1; overflow-y: auto; padding: 10px 12px; white-space: pre-wrap; line-height: 1.55; user-select: text; }
.ai-out.empty { color: var(--fg-3); }
.ai-actions { display: flex; gap: 6px; padding: 6px 12px; flex-wrap: wrap; }
.ai-chips { display: flex; flex-wrap: wrap; gap: 5px; padding: 8px 12px 4px; border-top: 1px solid var(--line); }
.ai-chips button { border: 1px solid var(--line-2); background: transparent; border-radius: 12px; padding: 2px 10px; font-size: 12px; cursor: pointer; color: var(--fg-2); }
.ai-chips button:hover { border-color: var(--accent); color: var(--accent); }
.ai-input { display: flex; gap: 6px; padding: 6px 12px; align-items: flex-end; }
.ai-input textarea { flex: 1; resize: vertical; min-height: 40px; max-height: 200px; }
.ai-status { font-size: 11px; color: var(--fg-3); padding: 0 12px 8px; min-height: 16px; }
.ai-col.busy .ai-status::before { content: "● "; color: var(--accent); animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: .2; } }

/* modal */
.modal-back { position: fixed; inset: 0; background: rgba(0,0,0,.32); display: grid; place-items: center; z-index: 50; padding: 20px; }
.modal { background: var(--bg); border-radius: 12px; box-shadow: var(--shadow); width: min(860px, 100%); max-height: calc(100vh - 40px); display: flex; flex-direction: column; overflow: hidden; }
.modal.narrow { width: min(560px, 100%); }
.modal-head { display: flex; align-items: center; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.modal-head h2 { margin: 0; font-size: 15px; flex: 1; }
.modal-body { overflow-y: auto; padding: 16px; flex: 1; }
.modal-foot { padding: 10px 16px; border-top: 1px solid var(--line); display: flex; gap: 8px; justify-content: flex-end; }
.settings { display: flex; min-height: 460px; }
.settings .tabs { width: 160px; flex: 0 0 160px; border-right: 1px solid var(--line); padding: 10px 6px; background: var(--side); }
.settings .tabs div { padding: 6px 10px; border-radius: 6px; cursor: pointer; }
.settings .tabs div.on { background: var(--sel); font-weight: 600; }
.settings .pane { flex: 1; padding: 16px 20px; overflow-y: auto; }
.form-grid { display: grid; grid-template-columns: 150px 1fr; gap: 8px 12px; align-items: center; }
.form-grid label { color: var(--fg-2); font-size: 12px; text-align: right; }
.form-grid .full { grid-column: 1 / -1; }
.form-grid h4 { grid-column: 1 / -1; margin: 12px 0 0; font-size: 13px; border-bottom: 1px solid var(--line); padding-bottom: 4px; }
.form-grid .inline { display: flex; gap: 6px; align-items: center; }
.form-grid .hint { grid-column: 2; font-size: 11.5px; color: var(--fg-3); margin-top: -4px; }
.list-table { width: 100%; border-collapse: collapse; }
.list-table td, .list-table th { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
.list-table th { font-size: 11px; text-transform: uppercase; color: var(--fg-3); }
.code { font-family: ui-monospace, Menlo, monospace; font-size: 11.5px; background: var(--bg-2); border: 1px solid var(--line); padding: 6px 8px; border-radius: 6px; word-break: break-all; user-select: all; }
.compose-modal .composer { border-top: 0; padding: 0; }
.compose-modal .composer textarea { height: 260px; }
.menu { position: fixed; background: var(--bg); border: 1px solid var(--line-2); border-radius: 8px; box-shadow: var(--shadow); padding: 4px; z-index: 60; min-width: 200px; max-height: 360px; overflow-y: auto; }
.menu div { padding: 6px 10px; border-radius: 5px; cursor: pointer; }
.menu div:hover { background: var(--sel); }
.menu .mh { font-size: 11px; color: var(--fg-3); cursor: default; }
.menu .mh:hover { background: transparent; }

.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: #222; color: #fff; padding: 8px 16px; border-radius: 8px; z-index: 80; box-shadow: var(--shadow); max-width: 80vw; }
.toast.error { background: var(--danger); }

@media (max-width: 1100px) { .ai-col { width: 280px; } .list-col { width: 320px; } }