:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-subtle: #f8fafc;
  --border: #e2e8f0;
  --ink: #0f172a;
  --muted: #64748b;
  --header-bg: #0f172a;
  --header-ink: #e2e8f0;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-ink: #ffffff;

  /* Semantic funnel colours: neutral -> info -> warning -> danger */
  --stage-sent: #64748b;
  --stage-opened: #2563eb;
  --stage-clicked: #d97706;
  --stage-submitted: #dc2626;
  --safe: #16a34a;

  --radius: 10px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

[data-theme="dark"] {
  --bg: #0b1120;
  --surface: #111827;
  --surface-subtle: #1e293b;
  --border: #1f2937;
  --ink: #f1f5f9;
  --muted: #94a3b8;
  --header-bg: #070b14;
  --header-ink: #e2e8f0;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
body {
  margin: 0; font-family: var(--sans); color: var(--ink);
  background: var(--bg); line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- App shell (sidebar + content) ---------- */
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 240px; flex-shrink: 0;
  background: var(--header-bg); color: var(--header-ink);
  display: flex; flex-direction: column;
  padding: 20px 14px; position: sticky; top: 0; height: 100vh;
  border-right: 1px solid rgba(255,255,255,.06);
}
.sidebar .brand {
  color: #fff; font-weight: 700; letter-spacing: -0.01em;
  display: flex; align-items: center; gap: 10px;
  margin: 4px 8px 24px; font-size: 1.15rem;
}
.sidebar .brand:hover { text-decoration: none; }
.sidebar .brand .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--stage-clicked); box-shadow: 0 0 0 4px rgba(217,119,6,.25);
}
.side-nav { display: flex; flex-direction: column; gap: 4px; }
.side-nav a {
  color: #94a3b8; padding: 9px 12px; border-radius: 8px; font-size: 0.9rem;
  display: flex; align-items: center; gap: 10px; font-weight: 500;
  transition: background 0.15s ease, color 0.15s ease;
}
.side-nav a svg { width: 17px; height: 17px; flex-shrink: 0; opacity: 0.85; }
.side-nav a:hover { background: rgba(255,255,255,.07); color: #fff; text-decoration: none; }
.side-nav a.active { background: rgba(59,130,246,.18); color: #fff; font-weight: 600; }
.side-nav a.active svg { color: #60a5fa; opacity: 1; }
.side-foot { margin-top: auto; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.08); }
.side-foot .who {
  font-size: 0.78rem; color: #94a3b8; padding: 0 10px 12px;
  display: flex; flex-direction: column; gap: 2px; word-break: break-all;
}
.side-foot .who .role {
  color: #cbd5e1; text-transform: uppercase; letter-spacing: 0.05em;
  font-size: 0.68rem; font-weight: 700;
}
.side-actions { display: flex; flex-direction: column; gap: 6px; }
.side-logout, .theme-btn {
  display: flex; align-items: center; justify-content: space-between;
  color: #cbd5e1; padding: 8px 11px; border-radius: 7px;
  font-size: 0.84rem; border: 1px solid rgba(255,255,255,.1);
  background: transparent; cursor: pointer; font-family: inherit; width: 100%;
  text-align: left;
}
.side-logout:hover, .theme-btn:hover {
  background: rgba(255,255,255,.08); color: #fff; text-decoration: none;
}

.content { flex: 1; min-width: 0; }
.container { max-width: 1040px; margin: 0 auto; padding: 32px 28px 64px; }

/* ---------- Headings ---------- */
.page-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 24px; }
.page-head h1 { font-size: 1.55rem; margin: 0; letter-spacing: -0.02em; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.page-head .sub { color: var(--muted); margin: 4px 0 0; font-size: 0.92rem; }

/* ---------- KPI Summary Grid ---------- */
.kpi-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 20px;
}
.kpi-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow);
}
.kpi-card .kpi-label {
  color: var(--muted); font-size: 0.78rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.04em;
}
.kpi-card .kpi-val {
  font-family: var(--mono); font-size: 1.65rem; font-weight: 700;
  margin: 6px 0 2px; line-height: 1.1;
}
.kpi-card .kpi-sub { color: var(--muted); font-size: 0.8rem; }

/* ---------- Filter / Search Bar ---------- */
.filter-bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; margin-bottom: 14px;
}
.search-input {
  max-width: 280px; padding: 8px 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 0.88rem; background: var(--surface); color: var(--ink);
}
.filter-pills { display: flex; gap: 6px; flex-wrap: wrap; }
.filter-pill {
  border: 1px solid var(--border); background: var(--surface); color: var(--muted);
  padding: 5px 12px; border-radius: 999px; font-size: 0.8rem; font-weight: 600;
  cursor: pointer; font-family: inherit; transition: all 0.15s ease;
}
.filter-pill:hover { color: var(--ink); border-color: var(--muted); }
.filter-pill.active {
  background: var(--accent); color: #fff; border-color: var(--accent);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--accent); color: var(--accent-ink);
  border: 1px solid var(--accent); padding: 9px 16px; border-radius: 8px;
  font-size: 0.88rem; font-weight: 600; cursor: pointer; font-family: inherit;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { background: var(--accent-hover); text-decoration: none; }
.btn.secondary { background: var(--surface); color: var(--ink); border-color: var(--border); }
.btn.secondary:hover { background: var(--surface-subtle); }
.btn.danger { background: transparent; color: var(--stage-submitted); border-color: rgba(220,38,38,.35); }
.btn.danger:hover { background: rgba(220,38,38,.08); }
.btn.small { padding: 5px 11px; font-size: 0.8rem; }

/* ---------- Cards ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
}
.card + .card { margin-top: 16px; }
.card h2 { font-size: 1.05rem; }

/* ---------- Flash ---------- */
.flash {
  padding: 11px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 0.9rem;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.flash .close-btn {
  background: none; border: none; color: inherit; font-size: 1.1rem;
  cursor: pointer; opacity: 0.65; padding: 0 4px;
}
.flash .close-btn:hover { opacity: 1; }
.flash.success { background: rgba(22,163,74,.12); color: #15803d; border: 1px solid rgba(22,163,74,.3); }
.flash.error { background: rgba(220,38,38,.12); color: #b91c1c; border: 1px solid rgba(220,38,38,.3); }
.flash.info { background: rgba(37,99,235,.12); color: #1d4ed8; border: 1px solid rgba(37,99,235,.3); }
[data-theme="dark"] .flash.success { color: #4ade80; }
[data-theme="dark"] .flash.error { color: #f87171; }
[data-theme="dark"] .flash.info { color: #60a5fa; }

/* ---------- Forms ---------- */
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; }
.field .hint { font-weight: 400; color: var(--muted); }
input[type=text], input[type=email], input[type=password], input[type=number],
input[type=datetime-local], textarea, select {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border);
  border-radius: 8px; font-family: inherit; font-size: 0.92rem;
  background: var(--surface); color: var(--ink);
}
textarea { resize: vertical; min-height: 90px; }
input:focus, textarea:focus, select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(37,99,235,.15);
}
.radio-row { display: flex; gap: 12px; flex-wrap: wrap; }
.radio-row label {
  flex: 1; min-width: 180px; border: 1px solid var(--border); border-radius: 8px;
  padding: 12px; cursor: pointer; font-weight: 500; display: flex; gap: 9px; align-items: flex-start;
  background: var(--surface-subtle);
}
.radio-row label .desc { display: block; font-weight: 400; color: var(--muted); font-size: 0.82rem; margin-top: 2px; }
.radio-row input { width: auto; margin-top: 3px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.chip {
  border: 1px solid var(--border); background: var(--surface); border-radius: 999px;
  padding: 5px 12px; font-size: 0.82rem; cursor: pointer; font-family: inherit; color: var(--ink);
}
.chip:hover { background: var(--surface-subtle); }
details.section {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 4px 18px; margin-bottom: 16px; background: var(--surface); box-shadow: var(--shadow);
}
details.section summary { cursor: pointer; font-weight: 600; padding: 12px 0; font-size: 0.92rem; }
details.section[open] summary { border-bottom: 1px solid var(--border); margin-bottom: 14px; }

/* ---------- Live Email Preview Box ---------- */
.email-preview-wrap {
  border: 1px solid var(--border); border-radius: 10px; overflow: hidden;
  background: var(--surface-subtle); margin-top: 12px;
}
.email-preview-head {
  padding: 10px 14px; border-bottom: 1px solid var(--border);
  font-size: 0.82rem; background: var(--surface); display: grid; gap: 4px;
}
.email-preview-body {
  padding: 18px; background: #ffffff; color: #1e293b; font-size: 0.92rem; min-height: 140px;
}
[data-theme="dark"] .email-preview-body {
  background: #0f172a; color: #e2e8f0;
}

/* ---------- Modal Dialog ---------- */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(15, 23, 42, 0.6);
  display: none; place-items: center; padding: 24px; z-index: 100;
}
.modal-backdrop.open { display: grid; }
.modal-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; width: 100%; max-width: 640px; overflow: hidden;
  box-shadow: 0 20px 50px rgba(0,0,0,.3);
}
.modal-head {
  padding: 14px 20px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.modal-body { padding: 20px; max-height: 75vh; overflow-y: auto; }

/* ---------- Tables ---------- */
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 12px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.04em; }
tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--surface-subtle); }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* ---------- Pills / tags ---------- */
.pill { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.pill.pending   { background: rgba(100,116,139,.15); color: var(--muted); }
.pill.sent      { background: rgba(100,116,139,.15); color: var(--stage-sent); }
.pill.opened    { background: rgba(37,99,235,.14); color: var(--stage-opened); }
.pill.clicked   { background: rgba(217,119,6,.15); color: var(--stage-clicked); }
.pill.submitted { background: rgba(220,38,38,.15); color: var(--stage-submitted); }
.pill.reported  { background: rgba(22,163,74,.15); color: var(--safe); }
.pill.low    { background: rgba(22,163,74,.15); color: var(--safe); }
.pill.medium { background: rgba(217,119,6,.15); color: var(--stage-clicked); }
.pill.high   { background: rgba(220,38,38,.15); color: var(--stage-submitted); }
.tag { display: inline-block; font-size: 0.72rem; font-weight: 700; padding: 2px 8px; border-radius: 5px; background: var(--surface-subtle); color: var(--muted); }
.tag.easy { background: rgba(22,163,74,.15); color: var(--safe); }
.tag.medium { background: rgba(217,119,6,.15); color: var(--stage-clicked); }
.tag.hard { background: rgba(220,38,38,.15); color: var(--stage-submitted); }
.tag.status { background: rgba(37,99,235,.14); color: var(--stage-opened); text-transform: capitalize; }

/* ---------- Funnel ---------- */
.funnel { display: grid; gap: 12px; }
.funnel-row { display: grid; grid-template-columns: 110px 1fr 124px; align-items: center; gap: 14px; }
.funnel-row .label { font-size: 0.85rem; font-weight: 600; }
.funnel-track { background: var(--surface-subtle); border-radius: 6px; height: 28px; overflow: hidden; border: 1px solid var(--border); }
.funnel-fill { height: 100%; border-radius: 5px; min-width: 2px; transition: width .3s ease; }
.funnel-fill.sent { background: var(--stage-sent); }
.funnel-fill.opened { background: var(--stage-opened); }
.funnel-fill.clicked { background: var(--stage-clicked); }
.funnel-fill.submitted { background: var(--stage-submitted); }
.funnel-row .count { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; }
.funnel-row .count b { font-size: 1.02rem; }
.funnel-row .count .pct { color: var(--muted); font-size: 0.8rem; }

.reported-stat {
  margin-top: 16px; padding: 12px 16px; border-radius: 8px;
  background: rgba(22,163,74,.1); border: 1px solid rgba(22,163,74,.28); color: var(--safe);
  display: flex; align-items: center; justify-content: space-between; font-size: 0.9rem;
}
.reported-stat b { font-family: var(--mono); font-size: 1.1rem; }

.mini { display: flex; height: 8px; width: 130px; border-radius: 4px; overflow: hidden; background: var(--surface-subtle); }
.mini span { display: block; height: 100%; }

/* ---------- Misc ---------- */
.empty { text-align: center; color: var(--muted); padding: 48px 24px; }
.empty p { margin: 8px 0 20px; }
.meta { color: var(--muted); font-size: 0.84rem; }
.spread { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* Action toolbar */
.toolbar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin: 0 0 22px; }
.toolbar form { margin: 0; }
.toolbar .btn { height: 38px; padding: 0 15px; }
.toolbar-spacer { flex: 1 1 auto; }

/* ---------- Centered auth / landing ---------- */
.center-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.auth-card { width: 100%; max-width: 380px; }
.auth-card h1 { font-size: 1.3rem; margin: 0 0 4px; }
.auth-card .meta { margin-bottom: 20px; }

@media (max-width: 860px) {
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
  .layout { flex-direction: column; }
  .sidebar { width: auto; height: auto; position: static; flex-direction: row;
             align-items: center; flex-wrap: wrap; padding: 10px 14px; gap: 6px; }
  .sidebar .brand { margin: 0 12px 0 4px; }
  .side-nav { flex-direction: row; flex-wrap: wrap; }
  .side-foot { margin: 0 0 0 auto; padding: 0; border-top: none; }
  .side-foot .who { display: none; }
  .side-actions { flex-direction: row; }
  .grid-2 { grid-template-columns: 1fr; }
  .funnel-row { grid-template-columns: 84px 1fr 96px; }
  .page-head { flex-direction: column; align-items: stretch; }
}
@media (max-width: 520px) {
  .kpi-grid { grid-template-columns: 1fr; }
}