:root {
  --navy: #0f172a;
  --navy-2: #1e293b;
  --blue: #2563eb;
  --blue-soft: #dbeafe;
  --green: #16a34a;
  --green-soft: #f0fdf4;
  --amber: #d97706;
  --text: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #f1f5f9;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .08), 0 8px 24px rgba(15, 23, 42, .06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Header ─────────────────────────────────────────── */
header.app-header {
  background: var(--navy);
  color: #fff;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 8px rgba(15, 23, 42, .25);
}
header.app-header .brand {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -.01em;
  display: flex;
  align-items: center;
  gap: 10px;
}
header.app-header .brand .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(22, 163, 74, .25);
}
header.app-header .right { display: flex; align-items: center; gap: 16px; font-size: 14px; }

/* ── Layout ─────────────────────────────────────────── */
.container { max-width: 1080px; margin: 0 auto; padding: 28px 20px 60px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}

h1 { font-size: 26px; margin: 0 0 6px; letter-spacing: -.02em; }
h2 { font-size: 18px; margin: 0 0 14px; }
.subtitle { color: var(--muted); margin: 0 0 24px; }

/* ── Stat cards grid ────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
}
.stat .label { color: var(--muted); font-size: 13px; font-weight: 500; }
.stat .value { font-size: 28px; font-weight: 700; margin-top: 6px; letter-spacing: -.02em; }
.stat.accent-green .value { color: var(--green); }
.stat.accent-amber .value { color: var(--amber); }
.stat.accent-blue .value { color: var(--blue); }

/* ── Referral link box ──────────────────────────────── */
.link-box {
  display: flex; gap: 10px; align-items: center;
  background: var(--green-soft);
  border: 1px solid #bbf7d0;
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 24px;
}
.link-box code {
  flex: 1; font-size: 15px; color: var(--navy);
  word-break: break-all; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* ── Buttons ────────────────────────────────────────── */
.btn {
  border: none; cursor: pointer;
  font-family: inherit; font-size: 14px; font-weight: 600;
  padding: 10px 16px; border-radius: 10px;
  background: var(--blue); color: #fff;
  transition: filter .15s ease;
}
.btn:hover { filter: brightness(1.08); }
.btn.green { background: var(--green); }
.btn.ghost { background: #fff; color: var(--navy); border: 1px solid var(--line); }
.btn.sm { padding: 7px 12px; font-size: 13px; }

/* ── Tables ─────────────────────────────────────────── */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
thead th {
  text-align: left; color: var(--muted); font-weight: 600;
  font-size: 12px; text-transform: uppercase; letter-spacing: .04em;
  padding: 10px 12px; border-bottom: 2px solid var(--line);
}
tbody td { padding: 12px; border-bottom: 1px solid var(--line); }
tbody tr:hover { background: #f8fafc; }
.table-wrap { overflow-x: auto; }

.pill {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600;
}
.pill.green { background: var(--green-soft); color: var(--green); }
.pill.amber { background: #fef3c7; color: var(--amber); }

/* ── Landing ────────────────────────────────────────── */
.hero {
  background: linear-gradient(160deg, var(--navy) 0%, var(--navy-2) 100%);
  color: #fff; border-radius: 20px;
  padding: 48px 36px; text-align: center; margin-bottom: 28px;
}
.hero h1 { font-size: 34px; color: #fff; }
.hero p { color: #cbd5e1; font-size: 17px; max-width: 540px; margin: 10px auto 28px; }
.features {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px; margin-bottom: 28px;
}
.feature { text-align: left; }
.feature .ico { font-size: 26px; }
.feature h3 { margin: 10px 0 4px; font-size: 16px; }
.feature p { color: var(--muted); font-size: 14px; margin: 0; }
.login-widget { display: flex; justify-content: center; min-height: 48px; }

footer {
  text-align: center; color: var(--muted); font-size: 13px;
  padding: 28px 20px; border-top: 1px solid var(--line); margin-top: 20px;
}

.muted { color: var(--muted); }
.error { color: #dc2626; font-size: 14px; }
.add-form { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)) auto; gap: 10px; align-items: end; margin-bottom: 22px; }
.add-form label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 4px; font-weight: 600; }
.add-form input { width: 100%; padding: 9px 11px; border: 1px solid var(--line); border-radius: 9px; font-family: inherit; font-size: 14px; }

@media (max-width: 600px) {
  .hero { padding: 36px 22px; }
  .hero h1 { font-size: 26px; }
  header.app-header { padding: 14px 16px; }
}