/* =========================================================================
   RefD Design System
   "Refer. Reward. Grow." — friendly, premium, plain-language SaaS UI.
   No external fonts/CDNs: everything here is self-contained so the app
   never depends on a third-party host being reachable.
   ========================================================================= */

:root {
  /* Brand */
  --brand-50:  #f5f3ff;
  --brand-100: #ede9fe;
  --brand-200: #ddd6fe;
  --brand-300: #c4b5fd;
  --brand-400: #a78bfa;
  --brand-500: #8b5cf6;
  --brand-600: #7c4dff;
  --brand-700: #6d28d9;
  --brand-800: #5b21b6;

  --mint-500: #14b8a6;
  --mint-600: #0d9488;
  --coral-500: #fb7185;
  --amber-500: #f59e0b;
  --sky-500: #0ea5e9;

  /* Neutrals */
  --ink-900: #14121f;
  --ink-800: #201d2e;
  --ink-700: #322e45;
  --ink-600: #4c4667;
  --ink-500: #6b6486;
  --ink-400: #8d86a8;
  --ink-300: #b6b0cc;
  --ink-200: #ddd8ea;
  --ink-100: #eeebf5;
  --ink-50:  #f8f7fc;
  --white: #ffffff;

  /* Semantic */
  --success-500: #16a34a;
  --success-100: #dcfce7;
  --warning-500: #d97706;
  --warning-100: #fef3c7;
  --danger-500:  #dc2626;
  --danger-100:  #fee2e2;
  --info-500: #2563eb;
  --info-100: #dbeafe;

  --bg-app: var(--ink-50);
  --bg-card: var(--white);
  --border: var(--ink-100);
  --text-primary: var(--ink-900);
  --text-secondary: var(--ink-500);
  --text-muted: var(--ink-400);

  /* Radius */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;
  --r-xl: 24px;
  --r-full: 999px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(20, 18, 31, 0.06);
  --shadow-md: 0 6px 20px rgba(20, 18, 31, 0.08);
  --shadow-lg: 0 16px 40px rgba(20, 18, 31, 0.14);
  --shadow-brand: 0 10px 24px rgba(124, 77, 255, 0.28);

  /* Spacing scale */
  --sp-1: 4px; --sp-2: 8px; --sp-3: 12px; --sp-4: 16px; --sp-5: 20px;
  --sp-6: 24px; --sp-7: 32px; --sp-8: 40px; --sp-9: 48px; --sp-10: 64px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --sidebar-w: 248px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg-app);
  color: var(--text-primary);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5 { margin: 0 0 var(--sp-2); font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: 28px; }
h2 { font-size: 22px; }
h3 { font-size: 18px; }
p { margin: 0 0 var(--sp-3); color: var(--text-secondary); }
a { color: var(--brand-600); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
small { color: var(--text-muted); font-size: 13px; }
code { background: var(--ink-100); padding: 2px 6px; border-radius: 6px; font-size: 13px; }

:focus-visible {
  outline: 2px solid var(--brand-500);
  outline-offset: 2px;
}

.container { max-width: 1180px; margin: 0 auto; padding: 0 var(--sp-6); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2);
  font-family: inherit; font-size: 14px; font-weight: 600; line-height: 1;
  padding: 11px 18px; border-radius: var(--r-md); border: 1px solid transparent;
  cursor: pointer; transition: transform .12s ease, box-shadow .12s ease, background .15s ease, border-color .15s ease;
  text-decoration: none; white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn:disabled, .btn.is-disabled { opacity: .55; cursor: not-allowed; pointer-events: none; }
.btn-primary { background: linear-gradient(135deg, var(--brand-600), var(--brand-700)); color: #fff; box-shadow: var(--shadow-brand); }
.btn-primary:hover { box-shadow: 0 14px 28px rgba(124,77,255,.34); }
.btn-secondary { background: var(--white); color: var(--ink-800); border-color: var(--ink-200); }
.btn-secondary:hover { border-color: var(--ink-300); background: var(--ink-50); }
.btn-ghost { background: transparent; color: var(--ink-700); }
.btn-ghost:hover { background: var(--ink-100); }
.btn-danger { background: var(--danger-500); color: #fff; }
.btn-danger-ghost { background: var(--danger-100); color: var(--danger-500); }
.btn-success { background: var(--success-500); color: #fff; }
.btn-sm { padding: 7px 12px; font-size: 13px; border-radius: var(--r-sm); }
.btn-lg { padding: 14px 24px; font-size: 15px; border-radius: var(--r-lg); }
.btn-block { width: 100%; }
.btn-icon { padding: 9px; }

/* ---------- Inputs ---------- */
.field { margin-bottom: var(--sp-4); }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--ink-700); margin-bottom: 6px; }
.field .hint { font-size: 12.5px; color: var(--text-muted); margin-top: 6px; }
.field .error { font-size: 12.5px; color: var(--danger-500); margin-top: 6px; font-weight: 600; }
.input, .select, textarea.input {
  width: 100%; font-family: inherit; font-size: 14px; color: var(--text-primary);
  background: var(--white); border: 1.5px solid var(--ink-200); border-radius: var(--r-md);
  padding: 11px 14px; transition: border-color .15s ease, box-shadow .15s ease;
}
.input:focus, .select:focus, textarea.input:focus {
  outline: none; border-color: var(--brand-500); box-shadow: 0 0 0 4px var(--brand-100);
}
.input.has-error, .select.has-error { border-color: var(--danger-500); }
textarea.input { resize: vertical; min-height: 90px; }
.input-group { display: flex; align-items: stretch; }
.input-otp { display: flex; gap: var(--sp-2); }
.input-otp input { width: 44px; height: 52px; text-align: center; font-size: 22px; font-weight: 700; }
.checkbox-row { display: flex; align-items: flex-start; gap: 10px; font-size: 13.5px; color: var(--ink-700); }

/* ---------- Cards ---------- */
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: var(--sp-6); box-shadow: var(--shadow-sm);
}
.card-compact { padding: var(--sp-4); }
.card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--sp-4); gap: var(--sp-3); }
.card-header h3 { margin: 0; }
.card-title-group .eyebrow { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); font-weight: 700; margin-bottom: 2px; }

.grid { display: grid; gap: var(--sp-5); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 980px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* ---------- KPI tiles ---------- */
.kpi { border-radius: var(--r-lg); padding: var(--sp-5); background: var(--white); border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.kpi .kpi-label { font-size: 12.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--text-muted); display: flex; align-items: center; gap: 6px; }
.kpi .kpi-value { font-size: 30px; font-weight: 800; letter-spacing: -0.02em; margin: 6px 0 4px; }
.kpi .kpi-delta { font-size: 12.5px; font-weight: 700; display: inline-flex; align-items: center; gap: 4px; }
.kpi .kpi-delta.up { color: var(--success-500); }
.kpi .kpi-delta.down { color: var(--danger-500); }
.kpi.kpi-brand { background: linear-gradient(135deg, var(--brand-600), var(--brand-800)); color: #fff; border: none; }
.kpi.kpi-brand .kpi-label, .kpi.kpi-brand .kpi-delta { color: rgba(255,255,255,.85); }

/* ---------- Badges ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 5px; font-size: 12px; font-weight: 700;
  padding: 4px 10px; border-radius: var(--r-full); line-height: 1.4; white-space: nowrap;
}
.badge-dot::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.badge-neutral { background: var(--ink-100); color: var(--ink-600); }
.badge-brand { background: var(--brand-100); color: var(--brand-700); }
.badge-success { background: var(--success-100); color: var(--success-500); }
.badge-warning { background: var(--warning-100); color: var(--warning-500); }
.badge-danger { background: var(--danger-100); color: var(--danger-500); }
.badge-info { background: var(--info-100); color: var(--info-500); }

/* ---------- Alerts ---------- */
.alert { display: flex; gap: var(--sp-3); align-items: flex-start; padding: var(--sp-4); border-radius: var(--r-md); border: 1px solid transparent; font-size: 13.5px; margin-bottom: var(--sp-4); }
.alert-success { background: var(--success-100); color: #14532d; border-color: #bbf7d0; }
.alert-danger { background: var(--danger-100); color: #7f1d1d; border-color: #fecaca; }
.alert-warning { background: var(--warning-100); color: #78350f; border-color: #fde68a; }
.alert-info { background: var(--info-100); color: #1e3a8a; border-color: #bfdbfe; }
.alert strong { display: block; margin-bottom: 2px; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--r-lg); background: var(--white); }
table.table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 640px; }
table.table th { text-align: left; font-size: 11.5px; text-transform: uppercase; letter-spacing: .04em; color: var(--text-muted); font-weight: 700; padding: 12px 16px; border-bottom: 1px solid var(--border); background: var(--ink-50); white-space: nowrap; }
table.table td { padding: 13px 16px; border-bottom: 1px solid var(--border); vertical-align: middle; }
table.table tr:last-child td { border-bottom: none; }
table.table tr.is-clickable:hover { background: var(--ink-50); cursor: pointer; }
.avatar { width: 34px; height: 34px; border-radius: 50%; background: var(--brand-100); color: var(--brand-700); display: inline-flex; align-items: center; justify-content: center; font-weight: 700; font-size: 12.5px; flex-shrink: 0; }

/* ---------- Empty / loading / error states ---------- */
.empty-state { text-align: center; padding: var(--sp-9) var(--sp-6); }
.empty-state .empty-icon { width: 64px; height: 64px; border-radius: 20px; background: var(--brand-100); color: var(--brand-600); display: flex; align-items: center; justify-content: center; margin: 0 auto var(--sp-4); }
.empty-state h3 { margin-bottom: 6px; }
.empty-state p { max-width: 420px; margin: 0 auto var(--sp-5); }

.skeleton { background: linear-gradient(90deg, var(--ink-100) 25%, var(--ink-50) 37%, var(--ink-100) 63%); background-size: 400% 100%; animation: skeleton 1.4s ease infinite; border-radius: var(--r-sm); }
@keyframes skeleton { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }

/* ---------- Funnel ---------- */
.funnel { display: flex; flex-direction: column; gap: 0; }
.funnel-step { display: grid; grid-template-columns: 120px 1fr 90px; align-items: center; gap: var(--sp-4); padding: 14px 0; }
.funnel-step + .funnel-step { border-top: 1px dashed var(--border); }
.funnel-step .funnel-num { font-size: 22px; font-weight: 800; letter-spacing: -0.02em; }
.funnel-step .funnel-label { font-size: 12.5px; color: var(--text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: .03em; }
.funnel-bar-track { height: 10px; border-radius: var(--r-full); background: var(--ink-100); overflow: hidden; }
.funnel-bar-fill { height: 100%; border-radius: var(--r-full); background: linear-gradient(90deg, var(--brand-500), var(--mint-500)); }
.funnel-rate { text-align: right; font-size: 12.5px; font-weight: 700; color: var(--text-muted); }
.funnel-arrow { text-align: center; font-size: 11.5px; color: var(--text-muted); padding-left: 120px; }

/* ---------- Layout: authenticated app shell ---------- */
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: var(--sidebar-w); flex-shrink: 0; background: var(--ink-900); color: #fff;
  padding: var(--sp-5) var(--sp-4); position: sticky; top: 0; height: 100vh; overflow-y: auto;
  display: flex; flex-direction: column; gap: var(--sp-6);
}
.sidebar-brand { display: flex; align-items: center; gap: 10px; padding: 0 var(--sp-2); font-weight: 800; font-size: 19px; letter-spacing: -0.02em; }
.sidebar-brand .logo-mark { width: 32px; height: 32px; border-radius: 10px; background: linear-gradient(135deg, var(--brand-400), var(--mint-500)); display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 14px; }
.sidebar-section { display: flex; flex-direction: column; gap: 2px; }
.sidebar-section .section-label { font-size: 10.5px; text-transform: uppercase; letter-spacing: .09em; color: rgba(255,255,255,.38); font-weight: 700; padding: 0 12px; margin: 10px 0 4px; }
.sidebar-link { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: var(--r-md); color: rgba(255,255,255,.72); font-size: 13.5px; font-weight: 600; }
.sidebar-link:hover { background: rgba(255,255,255,.06); text-decoration: none; color: #fff; }
.sidebar-link.active { background: rgba(124,77,255,.28); color: #fff; }
.sidebar-link .icon { width: 18px; height: 18px; flex-shrink: 0; }
.sidebar-footer { margin-top: auto; font-size: 12px; color: rgba(255,255,255,.4); padding: 0 12px; }

.app-main { flex: 1; min-width: 0; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-4); padding: 14px var(--sp-6); background: var(--white); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 20; }
.topbar-search { flex: 1; max-width: 380px; }
.topbar-actions { display: flex; align-items: center; gap: var(--sp-3); }
.icon-btn { width: 38px; height: 38px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; background: var(--ink-50); border: 1px solid var(--border); color: var(--ink-700); position: relative; cursor: pointer; }
.icon-btn:hover { background: var(--ink-100); }
.icon-btn .dot { position: absolute; top: 7px; right: 8px; width: 8px; height: 8px; border-radius: 50%; background: var(--coral-500); border: 2px solid #fff; }
.page-content { padding: var(--sp-6); max-width: 1280px; }
.page-header { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--sp-4); margin-bottom: var(--sp-6); flex-wrap: wrap; }
.page-header p { margin: 0; }
.mobile-nav-toggle { display: none; }

@media (max-width: 980px) {
  .sidebar { position: fixed; left: -280px; top: 0; z-index: 50; transition: left .2s ease; box-shadow: var(--shadow-lg); }
  .sidebar.is-open { left: 0; }
  .mobile-nav-toggle { display: inline-flex; }
  .page-content { padding: var(--sp-4); }
  .topbar { padding: 12px var(--sp-4); }
}

/* ---------- Modals & toasts ---------- */
.modal-backdrop { position: fixed; inset: 0; background: rgba(20,18,31,.5); display: flex; align-items: center; justify-content: center; padding: var(--sp-4); z-index: 100; }
.modal { background: #fff; border-radius: var(--r-lg); max-width: 480px; width: 100%; padding: var(--sp-6); box-shadow: var(--shadow-lg); max-height: 90vh; overflow-y: auto; }
.toast-stack { position: fixed; bottom: var(--sp-5); right: var(--sp-5); display: flex; flex-direction: column; gap: 10px; z-index: 200; }
.toast { background: var(--ink-900); color: #fff; padding: 13px 18px; border-radius: var(--r-md); font-size: 13.5px; box-shadow: var(--shadow-lg); min-width: 240px; }
.toast.success { background: #14532d; }
.toast.error { background: #7f1d1d; }

/* ---------- Public marketing / referral pages ---------- */
.public-header { display: flex; align-items: center; justify-content: space-between; padding: var(--sp-5) 0; }
.hero { padding: var(--sp-10) 0; text-align: center; }
.hero h1 { font-size: 46px; max-width: 720px; margin: 0 auto var(--sp-4); }
.hero p.lead { font-size: 18px; max-width: 560px; margin: 0 auto var(--sp-6); }
@media (max-width: 640px) { .hero h1 { font-size: 32px; } }

.claim-shell { max-width: 460px; margin: 0 auto; padding: var(--sp-6) var(--sp-4); }
.claim-card { background: #fff; border-radius: var(--r-xl); box-shadow: var(--shadow-lg); padding: var(--sp-7) var(--sp-6); text-align: center; }
.offer-pill { display: inline-block; background: linear-gradient(135deg, var(--brand-600), var(--mint-600)); color: #fff; font-weight: 800; font-size: 26px; padding: 14px 22px; border-radius: var(--r-lg); margin: var(--sp-4) 0; }
.step-list { text-align: left; display: flex; flex-direction: column; gap: var(--sp-3); margin: var(--sp-5) 0; }
.step-item { display: flex; gap: 12px; align-items: flex-start; }
.step-item .step-num { width: 26px; height: 26px; border-radius: 50%; background: var(--brand-100); color: var(--brand-700); font-weight: 800; font-size: 12.5px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }

.progress-steps { display: flex; align-items: center; gap: 6px; margin-bottom: var(--sp-6); }
.progress-steps .ps-dot { flex: 1; height: 6px; border-radius: var(--r-full); background: var(--ink-100); }
.progress-steps .ps-dot.done { background: var(--brand-500); }
.progress-steps .ps-dot.current { background: var(--brand-300); }

/* ---------- Misc utility ---------- */
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 4px; } .gap-2 { gap: 8px; } .gap-3 { gap: 12px; } .gap-4 { gap: 16px; }
.mt-1 { margin-top: 4px; } .mt-2 { margin-top: 8px; } .mt-3 { margin-top: 12px; } .mt-4 { margin-top: 16px; } .mt-6 { margin-top: 24px; }
.mb-1 { margin-bottom: 4px; } .mb-2 { margin-bottom: 8px; } .mb-3 { margin-bottom: 12px; } .mb-4 { margin-bottom: 16px; } .mb-6 { margin-bottom: 24px; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-sm { font-size: 13px; }
.text-xs { font-size: 12px; }
.text-center { text-align: center; }
.font-bold { font-weight: 700; }
.w-full { width: 100%; }
.rounded-full { border-radius: var(--r-full); }
.divider { height: 1px; background: var(--border); margin: var(--sp-4) 0; border: none; }
.pill-tabs { display: inline-flex; background: var(--ink-100); border-radius: var(--r-full); padding: 4px; gap: 2px; }
.pill-tabs a { padding: 7px 14px; border-radius: var(--r-full); font-size: 13px; font-weight: 600; color: var(--ink-600); }
.pill-tabs a.active { background: #fff; color: var(--ink-900); box-shadow: var(--shadow-sm); }
.insight-card { background: linear-gradient(135deg, var(--brand-50), var(--mint-500)10); border: 1px solid var(--brand-100); border-radius: var(--r-lg); padding: var(--sp-4); display: flex; gap: 10px; align-items: flex-start; }
.qr-tile { border: 1px dashed var(--ink-300); border-radius: var(--r-lg); padding: var(--sp-5); text-align: center; background: var(--ink-50); }