:root {
  --bg: #F8FAFC;
  --card: #FFFFFF;
  --border: #E2E8F0;
  --line: #F1F5F9;
  --text: #0F172A;
  --text2: #334155;
  --text3: #64748B;
  --muted: #94A3B8;
  --brand-soft: #EEF2FF;
  --brand-soft2: #E0E7FF;
  --brand: #6366F1;
  --brand2: #4F46E5;
  --brand3: #4338CA;
  --brand-deep: #312E81;
  --violet: #7C3AED;
  --ok: #10B981;
  --warn: #F59E0B;
  --danger: #F43F5E;
  --radius: 12px;
  --radius-sm: 10px;
  --shadow: 0 4px 20px -2px rgba(79,70,229,.05);
  --shadow-hover: 0 10px 25px -5px rgba(79,70,229,.12), 0 8px 10px -6px rgba(79,70,229,.08);
  --font: "Plus Jakarta Sans", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(900px 400px at 0% 0%, rgba(99,102,241,.08), transparent 55%),
    radial-gradient(700px 360px at 100% 10%, rgba(124,58,237,.06), transparent 50%),
    var(--bg);
}
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
.hidden { display: none !important; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.muted { color: var(--text3); font-size: 12px; }

/* Login */
.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-card {
  width: min(420px, 100%);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-hover);
  padding: 28px;
}
.login-brand { display: flex; gap: 14px; align-items: center; margin-bottom: 22px; }
.login-brand h1 { margin: 0; font-size: 20px; font-weight: 800; letter-spacing: -.02em; }
.login-brand p { margin: 4px 0 0; color: var(--text3); font-size: 12px; }
.brand-icon {
  width: 48px; height: 48px; border-radius: 12px;
  display: grid; place-items: center;
  background: linear-gradient(180deg, #4F46E5, #4338CA);
  color: #fff; font-size: 22px;
  box-shadow: 0 4px 14px rgba(79,70,229,.30);
}
.brand-icon.sm { width: 36px; height: 36px; font-size: 16px; border-radius: 10px; }
.login-hint { margin: 16px 0 0; color: var(--muted); font-size: 11.5px; line-height: 1.5; }
.form-error { color: var(--danger); font-size: 12px; margin-top: 10px; }

/* Shell */
.shell { display: flex; min-height: 100vh; }
.sidebar-backdrop {
  display: none;
}
.sidebar {
  width: 256px; flex-shrink: 0;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh;
  z-index: 40;
  transition: transform .22s ease;
}
.sidebar-brand {
  display: flex; gap: 12px; align-items: center;
  padding: 18px 18px 14px;
  border-bottom: 1px solid var(--line);
}
.sidebar-brand-text { min-width: 0; flex: 1; }
.sidebar-close { display: none; }
.brand-title { font-weight: 800; font-size: 14px; }
.brand-sub { font-size: 11px; color: var(--text3); }
.nav { padding: 12px 12px; flex: 1; overflow: auto; }
.nav-group {
  font-size: 10px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted);
  padding: 12px 10px 6px;
}
.nav-item {
  width: 100%; text-align: left;
  border: 0; background: transparent;
  color: var(--text2); border-radius: var(--radius-sm);
  padding: 11px 12px; margin-bottom: 2px;
  font-weight: 600; font-size: 13.5px;
  transition: .15s ease;
}
.nav-item:hover { background: #F1F5F9; }
.nav-item.active {
  background: linear-gradient(180deg, #EEF2FF, #E0E7FF);
  color: var(--brand2);
}
.sidebar-footer {
  padding: 14px;
  border-top: 1px solid var(--line);
  display: grid; gap: 8px;
}
.status-pill {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; color: var(--text2); font-weight: 600;
}
.dot { width: 8px; height: 8px; border-radius: 999px; background: var(--muted); }
.dot.ok { background: var(--ok); box-shadow: 0 0 0 3px rgba(16,185,129,.15); }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; justify-content: space-between; align-items: center;
  gap: 12px;
  padding: 14px 24px;
  background: rgba(248,250,252,.78);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-left {
  display: flex; align-items: center; gap: 10px; min-width: 0;
}
.topbar-titles { min-width: 0; }
.breadcrumb { font-size: 11.5px; color: var(--text3); margin-bottom: 2px; }
.page-title { margin: 0; font-size: 24px; font-weight: 800; letter-spacing: -.03em; }
.topbar-right { display: flex; gap: 10px; align-items: center; flex-shrink: 0; }
.clock { font-size: 12px; color: var(--text3); }
.menu-btn { display: none; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 10px;
  border: 1px solid var(--border); background: #fff;
  display: inline-grid; place-items: center;
  color: var(--text2); padding: 0; flex-shrink: 0;
}
.icon-btn:hover { background: #F8FAFC; border-color: #CBD5E1; }
.hamburger, .hamburger::before, .hamburger::after {
  display: block; width: 16px; height: 2px; background: var(--text2);
  border-radius: 2px; position: relative;
}
.hamburger::before, .hamburger::after {
  content: ""; position: absolute; left: 0;
}
.hamburger::before { top: -5px; }
.hamburger::after { top: 5px; }
.content {
  width: min(1280px, 100%);
  margin: 0 auto;
  padding: 20px 24px 40px;
}
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }

/* Buttons / inputs */
.btn {
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  padding: 9px 14px;
  font-weight: 600; font-size: 13px;
  transition: .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  color: #fff;
  background: linear-gradient(180deg, #4F46E5 0%, #4338CA 100%);
  box-shadow: 0 4px 14px 0 rgba(79,70,229,.30);
}
.btn-primary:hover { filter: brightness(1.05); }
.btn-secondary {
  background: #fff; border-color: var(--border); color: var(--text2);
}
.btn-secondary:hover { background: #F8FAFC; border-color: #CBD5E1; }
.btn-danger {
  color: #fff;
  background: linear-gradient(180deg, #F43F5E, #E11D48);
}
.btn-block { width: 100%; }
.btn-sm { padding: 6px 10px; font-size: 12px; }
.input, .select, .textarea {
  width: 100%;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text);
  outline: none;
}
.input:focus, .select:focus, .textarea:focus {
  border-color: var(--brand2);
  box-shadow: 0 0 0 2px #fff, 0 0 0 4px rgba(79,70,229,.55);
}
.field-label {
  display: block; font-size: 12px; font-weight: 600;
  color: var(--text2); margin-bottom: 6px;
}
.field { margin-bottom: 12px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }

/* Cards */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px;
  transition: .2s ease;
}
.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: #C7D2FE;
}
.stat-icon {
  width: 36px; height: 36px; border-radius: 10px;
  display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand2);
  font-size: 16px; margin-bottom: 10px;
}
.stat-label { font-size: 12px; color: var(--text3); font-weight: 600; }
.stat-value {
  margin-top: 4px;
  font-size: 24px; font-weight: 800; letter-spacing: -.03em;
  font-family: var(--mono); font-variant-numeric: tabular-nums;
}
.stat-sub { margin-top: 6px; font-size: 11.5px; color: var(--text3); }
.stat-value.pos { color: var(--ok); }
.stat-value.neg { color: var(--danger); }

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}
.panel-hd {
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: 16px 18px 0;
  gap: 12px;
}
.panel-title { margin: 0; font-size: 14px; font-weight: 700; }
.panel-sub { margin: 4px 0 0; font-size: 11.5px; color: var(--text3); }
.panel-bd { padding: 16px 18px 18px; }

.toolbar {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: end;
  margin-bottom: 12px;
}
.toolbar .field { margin: 0; min-width: 140px; }

table.data {
  width: 100%; border-collapse: collapse;
  font-size: 12.5px;
}
table.data th {
  position: sticky; top: 0;
  background: #F8FAFC;
  text-align: left;
  font-size: 10.5px; letter-spacing: .06em; text-transform: uppercase;
  color: var(--text3); font-weight: 700;
  padding: 10px 8px; border-bottom: 1px solid var(--border);
}
table.data td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.data tr:hover td { background: #F8FAFC; }
table.data .mono { font-size: 12px; }
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  border-radius: 999px; padding: 3px 8px;
  font-size: 11px; font-weight: 700;
  border: 1px solid var(--border); background: #fff; color: var(--text2);
}
.pill.ok { background: #ECFDF5; border-color: #A7F3D0; color: #047857; }
.pill.warn { background: #FFFBEB; border-color: #FDE68A; color: #B45309; }
.pill.bad { background: #FFF1F2; border-color: #FECDD3; color: #BE123C; }
.pill.info { background: var(--brand-soft); border-color: var(--brand-soft2); color: var(--brand-deep); }

.token-pair {
  display: grid; gap: 2px;
  font-family: var(--mono); font-size: 11.5px;
  font-variant-numeric: tabular-nums;
}
.token-pair .raw { color: var(--text3); }
.token-pair .mod { color: var(--text); font-weight: 600; }

.tabs { display: flex; gap: 6px; margin-bottom: 12px; }
.tab {
  border: 1px solid var(--border); background: #fff;
  border-radius: 999px; padding: 6px 12px;
  font-size: 12px; font-weight: 600; color: var(--text3);
}
.tab.active { background: var(--brand-soft); border-color: var(--brand-soft2); color: var(--brand2); }

/* Modal */
.modal {
  position: fixed; inset: 0; z-index: 50;
  display: grid; place-items: center; padding: 20px;
}
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(15,23,42,.45);
  backdrop-filter: blur(4px);
}
.modal-card {
  position: relative;
  width: min(720px, 100%);
  max-height: min(90vh, 900px);
  overflow: auto;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 20px 60px -10px rgba(15,23,42,.25);
  border: 1px solid var(--border);
}
.modal-hd {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center;
}
.modal-hd h3 { margin: 0; font-size: 16px; font-weight: 800; }
.modal-bd { padding: 16px 18px; }
.modal-ft {
  padding: 14px 18px;
  border-top: 1px solid var(--line);
  background: #F8FAFC;
  display: flex; justify-content: flex-end; gap: 8px;
}

.toast {
  position: fixed; right: 18px; bottom: 18px; z-index: 60;
  background: #fff; border: 1px solid var(--border);
  border-left: 3px solid var(--brand2);
  border-radius: 10px; padding: 12px 14px;
  box-shadow: var(--shadow-hover);
  min-width: 220px; max-width: 360px;
  font-size: 13px; font-weight: 600;
}
.toast.bad { border-left-color: var(--danger); }
.toast.ok { border-left-color: var(--ok); }

.rule-box {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  background: #FCFDFF;
  margin-bottom: 10px;
}
.rule-box h4 { margin: 0 0 10px; font-size: 12px; color: var(--text2); }
.empty {
  padding: 28px; text-align: center; color: var(--text3); font-size: 13px;
}
.copy-row {
  display: flex; gap: 8px; align-items: center;
}
.copy-row code {
  flex: 1; background: #F8FAFC; border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 10px;
  font-family: var(--mono); font-size: 12px; overflow: auto;
}

/* Channel cards */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.channel-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px 14px;
  transition: .18s ease;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 100%;
}
.channel-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: #C7D2FE;
}
.channel-card.is-disabled {
  opacity: .78;
  background: #FCFCFD;
}
.ch-top {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: flex-start;
}
.ch-top-left { min-width: 0; flex: 1; }
.ch-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.ch-name {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.25;
}
.ch-platform {
  margin-top: 4px;
  font-size: 12px;
  color: var(--text3);
}
.ch-metric {
  text-align: right;
  flex-shrink: 0;
}
.ch-metric-label {
  font-size: 11px;
  color: var(--text3);
  font-weight: 600;
}
.ch-metric-value {
  margin-top: 2px;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 800;
  color: var(--brand-deep);
  letter-spacing: -.03em;
}
.ch-url {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: #F8FAFC;
  border: 1px solid var(--line);
  border-radius: 10px;
  min-width: 0;
}
.ch-url-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
  flex-shrink: 0;
}
.ch-url-value {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--text2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}
.ch-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 12px;
}
.ch-kv {
  min-width: 0;
}
.ch-k {
  font-size: 11px;
  color: var(--text3);
  font-weight: 600;
  margin-bottom: 3px;
}
.ch-v {
  font-size: 12.5px;
  color: var(--text);
  font-weight: 600;
  word-break: break-all;
}
.ch-v.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  font-weight: 500;
}
.ch-rules {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.ch-rule-box {
  border: 1px solid var(--line);
  background: #FCFDFF;
  border-radius: 10px;
  padding: 8px 10px;
}
.ch-rule-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--text2);
  margin-bottom: 6px;
}
.ch-rule-line {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 11px;
  padding: 2px 0;
  color: var(--text3);
}
.ch-rule-line strong {
  color: var(--text);
  font-family: var(--mono);
  font-weight: 600;
  font-size: 11px;
}
.ch-key-row {
  display: flex;
  gap: 8px;
  align-items: center;
}
.ch-key-row code {
  flex: 1;
  min-width: 0;
  background: #F8FAFC;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px;
  font-family: var(--mono);
  font-size: 11.5px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ch-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 2px;
  border-top: 1px dashed var(--line);
  margin-top: 2px;
}
.ch-remark {
  font-size: 12px;
  color: var(--text3);
  line-height: 1.45;
  background: #F8FAFC;
  border-radius: 8px;
  padding: 8px 10px;
}


@media (max-width: 1100px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .grid-4, .grid-3 { grid-template-columns: 1fr 1fr; }
  .channel-grid { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .shell { position: relative; }
  .menu-btn { display: inline-grid; }
  .sidebar-close { display: inline-grid; margin-left: auto; }

  .sidebar-backdrop {
    display: block;
    position: fixed; inset: 0; z-index: 35;
    background: rgba(15, 23, 42, .42);
    backdrop-filter: blur(3px);
    opacity: 0; pointer-events: none;
    transition: opacity .2s ease;
  }
  body.nav-open .sidebar-backdrop {
    opacity: 1; pointer-events: auto;
  }

  .sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    height: 100vh;
    width: min(288px, 86vw);
    transform: translateX(-105%);
    box-shadow: none;
    border-right: 1px solid var(--border);
  }
  body.nav-open .sidebar {
    transform: translateX(0);
    box-shadow: 12px 0 40px rgba(15, 23, 42, .14);
  }

  .main { width: 100%; }
  .topbar { padding: 12px 14px; }
  .page-title { font-size: 20px; }
  .clock { display: none; }
  .content { padding: 14px 14px 32px; }
  .stats { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat-value { font-size: 18px; }
  .panel-hd { flex-direction: column; align-items: stretch; gap: 10px; }
  .panel-hd .btn { width: 100%; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .channel-grid { grid-template-columns: 1fr; }
  .ch-rules { grid-template-columns: 1fr; }
  .ch-grid { grid-template-columns: 1fr; }
  .ch-key-row { flex-wrap: wrap; }
  .ch-key-row code { width: 100%; }
  .ch-actions { gap: 6px; }
  .ch-actions .btn { flex: 1 1 calc(50% - 6px); }
  .toolbar { flex-direction: column; align-items: stretch; }
  .toolbar .field { min-width: 0; width: 100%; }
  .modal { padding: 10px; align-items: flex-end; }
  .modal-card {
    width: 100%;
    max-height: min(92vh, 920px);
    border-radius: 16px 16px 12px 12px;
  }
  table.data { font-size: 11.5px; }
  table.data th, table.data td { padding: 8px 6px; }
  .login-card { padding: 22px 18px; }
  .login-brand h1 { font-size: 18px; }
}

@media (max-width: 640px) {
  .stats { grid-template-columns: 1fr; }
  .topbar-right .btn { padding: 8px 10px; }
  .stat-card { padding: 14px; }
  .ch-metric-value { font-size: 18px; }
  .panel-bd { padding: 14px; }
  .panel-hd { padding: 14px 14px 0; }
}

@media (prefers-reduced-motion: reduce) {
  .sidebar, .sidebar-backdrop, .channel-card, .stat-card { transition: none !important; }
}


/* ===== Expression rule workbench ===== */
.modal-card-wide {
  width: min(960px, 100%);
}
.modal-sub {
  margin: 4px 0 0;
  font-size: 12px;
  color: var(--text3);
  font-weight: 500;
}
.modal-bd-wide { padding-bottom: 8px; }

.expr-workbench {
  margin-top: 8px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background:
    linear-gradient(180deg, rgba(15,23,42,.02), transparent 40%),
    #FCFDFF;
  overflow: hidden;
}
.expr-workbench-hd {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #FFFFFF, #F8FAFC);
}
.expr-workbench-title {
  font-size: 13.5px;
  font-weight: 800;
  letter-spacing: -.01em;
}
.expr-workbench-sub {
  margin-top: 3px;
  font-size: 11.5px;
  color: var(--text3);
  line-height: 1.45;
}
.expr-tabs { margin: 0; }

.expr-panel { padding: 12px 14px 14px; }
.expr-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.expr-toolbar-left { min-width: 0; }
.expr-toolbar-right { display: flex; gap: 6px; flex-shrink: 0; }
.expr-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text2);
}
.expr-hint {
  display: block;
  margin-top: 2px;
  font-size: 10.5px;
  color: var(--muted);
}

.expr-templates {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}
.tpl-chip {
  border: 1px solid #C7D2FE;
  background: linear-gradient(180deg, #EEF2FF, #E0E7FF);
  color: var(--brand-deep);
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 11.5px;
  font-weight: 700;
  transition: .15s ease;
}
.tpl-chip:hover {
  border-color: #A5B4FC;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(79,70,229,.12);
}

.expr-editor {
  width: 100%;
  min-height: 180px;
  resize: vertical;
  border: 1px solid #1E293B;
  border-radius: 12px;
  background:
    linear-gradient(180deg, rgba(99,102,241,.08), transparent 30%),
    #0B1220;
  color: #E2E8F0;
  padding: 14px 14px 16px;
  line-height: 1.55;
  font-size: 12.5px;
  tab-size: 2;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.04), 0 8px 24px rgba(15,23,42,.18);
  caret-color: #A5B4FC;
}
.expr-editor::placeholder { color: #64748B; }
.expr-editor:focus {
  outline: none;
  border-color: #6366F1;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.04),
    0 0 0 2px rgba(15,23,42,.9),
    0 0 0 4px rgba(99,102,241,.45);
}

.expr-vars {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.expr-var {
  font-family: var(--mono);
  font-size: 10.5px;
  color: #334155;
  background: #F1F5F9;
  border: 1px solid #E2E8F0;
  border-radius: 6px;
  padding: 3px 7px;
}

.preview-panel {
  margin: 0 14px 14px;
  border: 1px dashed #CBD5E1;
  border-radius: 12px;
  background: #FFFFFF;
  padding: 12px 14px 14px;
}
.preview-hd {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.preview-title { font-size: 12.5px; font-weight: 800; }
.preview-sub { font-size: 11px; color: var(--text3); margin-top: 2px; }
.preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 12px;
}
.preview-result {
  border-radius: 10px;
  background: #F8FAFC;
  border: 1px solid var(--line);
  padding: 12px;
  min-height: 72px;
}
.preview-empty {
  color: var(--text3);
  font-size: 12.5px;
  text-align: center;
  padding: 14px 8px;
}
.preview-error {
  color: #BE123C;
  background: #FFF1F2;
  border: 1px solid #FECDD3;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 12.5px;
  font-family: var(--mono);
  white-space: pre-wrap;
  word-break: break-word;
}
.preview-compare {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
.preview-dim {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
}
.preview-dim-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text3);
  margin-bottom: 6px;
}
.preview-dim-vals {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 13px;
  font-weight: 600;
}
.preview-dim-vals .raw { color: var(--text3); }
.preview-dim-vals .arrow { color: var(--muted); font-size: 11px; }
.preview-dim-vals .mod { color: var(--brand-deep); font-size: 15px; font-weight: 800; }
.preview-dim-vals .delta {
  font-size: 11px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 999px;
}
.preview-dim-vals .delta.up { background: #ECFDF5; color: #047857; }
.preview-dim-vals .delta.down { background: #FFF1F2; color: #BE123C; }
.preview-dim-vals .delta.flat { background: #F1F5F9; color: #64748B; }
.preview-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

/* channel card rule preview */
.ch-rule-box.is-active {
  border-color: #C7D2FE;
  background: linear-gradient(180deg, #F8FAFF, #EEF2FF);
}
.ch-rule-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}
.ch-rule-badge {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--brand2);
  background: rgba(255,255,255,.8);
  border: 1px solid #C7D2FE;
  border-radius: 999px;
  padding: 1px 6px;
}
.ch-rule-box:not(.is-active) .ch-rule-badge {
  color: var(--text3);
  border-color: var(--border);
  background: #fff;
}
.ch-rule-script {
  font-size: 11px;
  color: var(--text2);
  line-height: 1.45;
  word-break: break-word;
  min-height: 2.6em;
}

/* special docs */
.docs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.docs-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  padding: 14px 16px;
}
.docs-card h4 {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 800;
}
.docs-list {
  margin: 0;
  padding-left: 18px;
  font-size: 12px;
  color: var(--text2);
  line-height: 1.7;
}
.docs-p {
  margin: 0 0 8px;
  font-size: 12.5px;
  color: var(--text2);
  line-height: 1.65;
}
.docs-code {
  margin: 8px 0 0;
  padding: 12px;
  border-radius: 10px;
  background: #0B1220;
  color: #E2E8F0;
  font-size: 11.5px;
  line-height: 1.5;
  overflow: auto;
}

@media (max-width: 900px) {
  .preview-grid { grid-template-columns: 1fr 1fr; }
  .preview-compare { grid-template-columns: 1fr; }
  .docs-grid { grid-template-columns: 1fr; }
  .expr-toolbar { flex-direction: column; align-items: stretch; }
  .expr-workbench-hd { flex-direction: column; }
}
@media (max-width: 640px) {
  .preview-grid { grid-template-columns: 1fr; }
}