/* ─── Design tokens ─────────────────────────────────────────── */
:root {
  --bg:        #f4f6fb;
  --card:      #ffffff;
  --text:      #111827;
  --muted:     #6b7280;
  --accent:    #2563eb;
  --accent-h:  #1d4ed8;
  --success:   #16a34a;
  --error:     #dc2626;
  --warn:      #d97706;
  --border:    #e5e7eb;
  --radius:    12px;
  --shadow:    0 1px 3px rgba(0,0,0,.08), 0 4px 12px rgba(0,0,0,.05);
}

/* ─── Reset / base ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: Inter, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ─── Topbar ────────────────────────────────────────────────── */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  height: 56px;
  background: #0f172a;
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 16px;
}
.topbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -.01em;
  white-space: nowrap;
}
.topbar-brand span { color: #94a3b8; font-weight: 400; font-size: 12px; }
.topnav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}
.topnav a {
  color: #94a3b8;
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  transition: background .15s, color .15s;
}
.topnav a:hover { background: rgba(255,255,255,.08); color: #fff; }
.topnav a.active { background: rgba(255,255,255,.1); color: #fff; }
.topnav .user-badge {
  color: #64748b;
  font-size: 12px;
  padding: 0 8px;
}

/* ─── Layout ────────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px;
}
.page-header {
  margin-bottom: 20px;
}
.page-header h1 { font-size: 22px; font-weight: 700; letter-spacing: -.02em; }
.page-header p  { color: var(--muted); margin-top: 4px; font-size: 13px; }

/* ─── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.card + .card, .card + .grid, .grid + .card { margin-top: 16px; }
.card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 12px;
}
.card h1 { font-size: 20px; font-weight: 700; margin-bottom: 6px; }
.card h2 { font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--muted); }

/* ─── Stat grids ─────────────────────────────────────────────── */
.stat-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}
.stat-card .stat-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.stat-card .stat-value {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -.03em;
  margin-top: 4px;
  color: var(--text);
}
.stat-card .stat-sub {
  font-size: 11px;
  color: var(--muted);
  margin-top: 2px;
}
.stat-card.highlight { border-left: 3px solid var(--accent); }
.stat-card.success-card { border-left: 3px solid var(--success); }

/* ─── Grid / split ───────────────────────────────────────────── */
.grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.split {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr 1fr;
}
@media (max-width: 720px) { .split { grid-template-columns: 1fr; } }

/* ─── Forms ─────────────────────────────────────────────────── */
.form { display: grid; gap: 16px; }
label {
  display: grid;
  gap: 5px;
  font-weight: 600;
  font-size: 13px;
  color: var(--text);
}
label .hint { font-weight: 400; color: var(--muted); font-size: 12px; }
input[type=text], input[type=password], input[type=number], input[type=date],
select, textarea {
  padding: 9px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
  width: 100%;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
textarea { resize: vertical; min-height: 80px; }
.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-weight: 400;
}
.checkbox-row input[type=checkbox] { margin-top: 2px; width: auto; }

/* ─── Buttons ────────────────────────────────────────────────── */
button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background .15s, box-shadow .15s;
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary, button[type=submit] {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover, button[type=submit]:hover {
  background: var(--accent-h);
  border-color: var(--accent-h);
}
.btn-secondary {
  background: #fff;
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { background: var(--bg); }
.btn-danger {
  background: #fff;
  color: var(--error);
  border-color: #fca5a5;
}
.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
  border-radius: 6px;
}
.btn-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

/* ─── Tables ─────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; border-radius: 10px; border: 1px solid var(--border); }
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.table th {
  text-align: left;
  padding: 10px 12px;
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .05em;
  background: #f9fafb;
  border-bottom: 1px solid var(--border);
}
.table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.table tr:last-child td { border-bottom: none; }
.table tr:hover td { background: #f9fafb; }

/* ─── Badges ─────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .02em;
}
.badge-success { background: #dcfce7; color: #15803d; }
.badge-error   { background: #fee2e2; color: #b91c1c; }
.badge-warn    { background: #fef9c3; color: #92400e; }
.badge-info    { background: #dbeafe; color: #1d4ed8; }
.badge-muted   { background: #f3f4f6; color: #6b7280; }

/* ─── Flash messages ─────────────────────────────────────────── */
.flash {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  font-size: 13px;
  font-weight: 500;
}
.flash.success { background: #f0fdf4; color: var(--success); border: 1px solid #bbf7d0; }
.flash.error   { background: #fef2f2; color: var(--error);   border: 1px solid #fecaca; }

/* ─── Misc helpers ───────────────────────────────────────────── */
.muted     { color: var(--muted); }
.top-gap   { margin-top: 16px; }
.small     { font-size: 12px; }
code {
  font-family: 'SF Mono', monospace;
  font-size: 12px;
  padding: 2px 6px;
  border-radius: 5px;
  background: #eff6ff;
  color: #1e40af;
}
details summary {
  cursor: pointer;
  font-size: 12px;
  color: var(--muted);
  font-weight: 600;
  padding: 6px 0;
  user-select: none;
}
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 16px 0;
}

/* ─── Funnel table (audience stats) ─────────────────────────── */
.funnel-table td:first-child { font-weight: 500; }
.funnel-table td:nth-child(2) { text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; }
.funnel-row-highlight { background: #eff6ff; }

/* ─── Send form layout ───────────────────────────────────────── */
.send-layout {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr 360px;
}
@media (max-width: 900px) { .send-layout { grid-template-columns: 1fr; } }

.send-step {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.send-step-num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.send-step-body { flex: 1; }
.send-step-body label { font-weight: 700; font-size: 14px; margin-bottom: 8px; }

/* ─── Preview result panel ───────────────────────────────────── */
.preview-panel {
  background: #f8faff;
  border: 1px solid #dbeafe;
  border-radius: var(--radius);
  padding: 16px;
}
.preview-panel .preview-row {
  display: flex;
  justify-content: space-between;
  padding: 5px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.preview-panel .preview-row:last-child { border-bottom: none; }
.preview-panel .preview-row strong { font-variant-numeric: tabular-nums; }

/* ─── Approval gate ──────────────────────────────────────────── */
.approval-gate {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius);
  padding: 16px;
}
.approval-gate .gate-label {
  font-size: 12px;
  font-weight: 700;
  color: #92400e;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 8px;
}

/* ─── Narrow (login/setup) ───────────────────────────────────── */
.narrow { max-width: 400px; margin: 64px auto; }

/* ─── Mobile ─────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .topbar { padding: 0 14px; }
  .container { padding: 16px 14px; }
  .stat-card .stat-value { font-size: 22px; }
  .topnav a { padding: 5px 7px; font-size: 12px; }
}