:root {
  --navy: #14507c;
  --navy-dark: #0e3c5e;
  --ink: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --bg: #f4f6f8;
  --paid: #1f7a4d;
  --unpaid: #9a3412;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}

a { color: var(--navy); }

/* ---- Top bar ---- */
.topbar { background: #fff; border-bottom: 1px solid var(--line); }
.topbar-inner {
  max-width: 980px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; gap: 24px; min-height: 68px;
}
.brand { display: flex; align-items: center; text-decoration: none; }
.brand img { height: 40px; width: auto; display: block; }
.nav { display: flex; gap: 4px; margin-left: 8px; flex: 1; }
.nav a { color: var(--muted); text-decoration: none; padding: 8px 12px; border-radius: 6px; font-size: .92rem; font-weight: 500; }
.nav a:hover { background: #eef2f6; color: var(--navy); }
.nav a.active { background: #eef4f9; color: var(--navy); }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 12px; font-size: .88rem; }
.who { color: var(--muted); }
.link-btn { background: none; border: 1px solid var(--line); color: var(--navy); padding: 5px 12px; border-radius: 6px; cursor: pointer; font-size: .85rem; }
.link-btn:hover { background: #eef4f9; }

/* ---- Layout ---- */
.container { max-width: 980px; margin: 28px auto; padding: 0 20px; }
.footer { max-width: 980px; margin: 40px auto; padding: 0 20px; color: var(--muted); font-size: .82rem; text-align: center; }

.page-head { margin-bottom: 20px; }
.page-head h1 { margin: 0 0 4px; font-size: 1.6rem; }
.subtitle { color: var(--muted); margin: 0; }

/* ---- Panels ---- */
.panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; margin-bottom: 18px; }
.panel h2 { margin: 0 0 14px; font-size: 1.15rem; }

/* ---- Forms ---- */
.field { margin-bottom: 14px; display: flex; flex-direction: column; gap: 5px; }
.field label { font-weight: 600; font-size: .88rem; }
input[type=text], input[type=password] {
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; font-size: .95rem; width: 100%;
}
.row { display: flex; gap: 14px; flex-wrap: wrap; align-items: flex-end; }
.row .field { flex: 1; min-width: 180px; }

.btn {
  display: inline-block; background: var(--navy); color: #fff; border: none;
  padding: 10px 18px; border-radius: 8px; font-size: .92rem; cursor: pointer; text-decoration: none;
}
.btn:hover { background: var(--navy-dark); }
.btn-secondary { background: #fff; color: var(--navy); border: 1px solid var(--navy); }
.btn-secondary:hover { background: #eef4f9; }
.btn-danger { background: #fff; color: var(--unpaid); border: 1px solid var(--unpaid); }
.btn-danger:hover { background: #fdf0ea; }
.btn-sm { padding: 6px 12px; font-size: .82rem; }

/* ---- Tables ---- */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 11px 10px; border-bottom: 1px solid var(--line); font-size: .92rem; }
th { font-size: .72rem; text-transform: uppercase; letter-spacing: .5px; color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.muted { color: var(--muted); }

/* ---- Pills / status ---- */
.pill { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: .74rem; font-weight: 600; background: #eef2f6; color: #475569; }
.pill-paid { background: #e3f3ea; color: var(--paid); }
.pill-unpaid { background: #fbe9e1; color: var(--unpaid); }
.pill-on { background: #e3f3ea; color: var(--paid); }
.pill-off { background: #fbe9e1; color: var(--unpaid); }

/* ---- Flash ---- */
.flash { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: .92rem; }
.flash-success { background: #e3f3ea; color: #14532d; border: 1px solid #b7e0c6; }
.flash-error { background: #fbe9e1; color: #7c2d12; border: 1px solid #f2c7b4; }
.flash-info { background: #e6f0f7; color: #0e3c5e; border: 1px solid #c2dcef; }

.empty { color: var(--muted); padding: 18px; text-align: center; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---- Copyable link box ---- */
.linkbox { display: flex; gap: 8px; align-items: center; }
.linkbox input { background: #f8fafc; }

/* ---- Customer summary cards ---- */
.summary { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.card { flex: 1; min-width: 160px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.card .num { font-size: 2rem; font-weight: 700; line-height: 1; }
.card .label { color: var(--muted); font-size: .85rem; margin-top: 6px; }
.card.unpaid .num { color: var(--unpaid); }
.card.paid .num { color: var(--paid); }

/* ---- Centered single-card pages (login, link error) ---- */
.center-wrap { max-width: 420px; margin: 8vh auto; }