:root {
  --bg: #0E1520;
  --surface: #16202E;
  --surface-2: #1C2A3D;
  --line: #24344A;
  --text: #E6EDF5;
  --muted: #8296AD;
  --data: #4FC3F7;   /* traffic / GB */
  --money: #F5B841;  /* margin / profit */
  --ok: #3DDC97;
  --danger: #FF6B6B;
  --radius: 10px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(79,195,247,.06), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  min-height: 100vh;
}
.mono { font-family: "JetBrains Mono", ui-monospace, monospace; font-variant-numeric: tabular-nums; }
.muted, .dim { color: var(--muted); }
.dim { opacity: .8; }

/* ---------- topbar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; background: rgba(14,21,32,.85);
  backdrop-filter: blur(8px); z-index: 5;
}
.brand {
  font-family: "Space Grotesk", sans-serif; font-weight: 700;
  letter-spacing: .14em; font-size: 15px;
}
.brand span, .login-mark span { color: var(--data); margin: 0 .35em; }
.topbar-right { display: flex; align-items: center; gap: 18px; }
.balance { color: var(--muted); font-size: 14px; }
.balance b { font-family: "JetBrains Mono", monospace; color: var(--text); }
.balance-low b { color: var(--danger); }
.link {
  background: none; border: 0; color: var(--muted); cursor: pointer;
  font: inherit; font-size: 14px; text-decoration: none; padding: 0;
}
.link:hover { color: var(--data); }
.inline { display: inline; margin: 0; }

/* ---------- layout ---------- */
.wrap { max-width: 860px; margin: 0 auto; padding: 26px 24px 60px; }
.panel {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px 22px; margin-bottom: 18px;
}
.panel-quiet { background: transparent; border-style: dashed; }
.eyebrow {
  font-size: 11px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--muted); font-weight: 600;
}
.section-h {
  font-family: "Space Grotesk", sans-serif; font-size: 16px; font-weight: 600;
  margin: 0 0 16px; display: flex; align-items: baseline; justify-content: space-between;
}
.section-note { font: 400 12px "JetBrains Mono", monospace; color: var(--muted); letter-spacing: 0; }
.section-link, .section-h a { font-size: 12px; color: var(--data); text-decoration: none; }

/* ---------- controls ---------- */
.controls { display: flex; flex-wrap: wrap; gap: 22px 40px; align-items: center; }
.months, .rate, .pw { display: flex; align-items: center; gap: 10px; margin: 0; }
.chip {
  font: 600 13px "JetBrains Mono", monospace; color: var(--muted);
  background: var(--surface-2); border: 1px solid var(--line);
  padding: 6px 14px; border-radius: 999px; cursor: pointer; white-space: nowrap;
}
.chip:hover { color: var(--text); }
.chip-on { color: var(--bg); background: var(--data); border-color: var(--data); }
.rate input, .pw input {
  width: 84px; background: var(--surface-2); border: 1px solid var(--line);
  color: var(--text); border-radius: 8px; padding: 8px 10px;
  font: 600 15px "JetBrains Mono", monospace;
}
.pw input { width: 210px; font-family: "Inter", sans-serif; font-weight: 400; }
.unit { color: var(--muted); font-size: 13px; }

/* ---------- tariffs (signature) ---------- */
.tariffs { display: grid; gap: 14px; }
.tariff {
  display: grid; grid-template-columns: 130px 1fr auto; align-items: center; gap: 18px;
  padding: 12px 14px; border-radius: 8px; border: 1px solid transparent;
}
.tariff:hover { background: var(--surface-2); }
.tariff-best { border-color: rgba(245,184,65,.35); background: rgba(245,184,65,.05); }
.tariff-head { display: flex; align-items: center; gap: 8px; }
.tariff-gb { font: 700 20px "Space Grotesk", sans-serif; }
.tariff-gb i { font-style: normal; font-size: 12px; color: var(--muted); font-weight: 500; }
.badge {
  font: 600 10px "Inter", sans-serif; letter-spacing: .04em; color: var(--money);
  border: 1px solid rgba(245,184,65,.4); border-radius: 999px; padding: 2px 7px;
}
.bar { height: 8px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.bar-fill {
  display: block; height: 100%; width: var(--w);
  background: linear-gradient(90deg, rgba(79,195,247,.5), var(--data));
  border-radius: 999px; animation: grow .7s cubic-bezier(.2,.7,.2,1) both;
}
@keyframes grow { from { width: 0; } }
.ledger { display: flex; align-items: baseline; gap: 8px; font-family: "JetBrains Mono", monospace; }
.ledger .cost { color: var(--muted); }
.ledger .arrow { color: var(--line); }
.ledger .price { font-weight: 700; font-size: 16px; }
.ledger .margin, .margin { color: var(--money); font-weight: 700; }

/* ---------- issue form ---------- */
.issue { display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-end; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field-grow { flex: 1 1 200px; }
.field > span { font-size: 12px; color: var(--muted); }
.field input, .field select {
  background: var(--surface-2); border: 1px solid var(--line); color: var(--text);
  border-radius: 8px; padding: 10px 12px; font: 400 15px "Inter", sans-serif; min-width: 110px;
}
.field input[type=number] { font-family: "JetBrains Mono", monospace; font-weight: 600; }
.issue-note { margin: 12px 0 0; font-size: 12px; }

/* ---------- buttons ---------- */
.btn {
  font: 600 14px "Inter", sans-serif; cursor: pointer;
  background: var(--surface-2); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 10px 16px; transition: border-color .15s, transform .05s;
}
.btn:hover { border-color: var(--data); }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--data); color: #06121C; border-color: var(--data); }
.btn-primary:hover { background: #6fd0fa; border-color: #6fd0fa; }
.btn-block { width: 100%; margin-top: 6px; }
.btn-mini { padding: 4px 10px; font-size: 12px; }
.btn-copy.copied { border-color: var(--ok); color: var(--ok); }

/* ---------- key output ---------- */
.keyout {
  border: 1px solid rgba(61,220,151,.4); background: rgba(61,220,151,.06);
  border-radius: var(--radius); padding: 16px 18px; margin-bottom: 18px;
}
.keyout-label { font-size: 12px; color: var(--ok); margin-bottom: 10px; letter-spacing: .04em; }
.keyout-row { display: flex; gap: 12px; align-items: center; }
.keyout code {
  flex: 1; font-family: "JetBrains Mono", monospace; font-size: 13px;
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
  padding: 10px 12px; overflow-x: auto; white-space: nowrap; color: var(--data);
}

/* ---------- flash ---------- */
.flash { border-radius: 8px; padding: 11px 14px; margin-bottom: 16px; font-size: 14px; }
.flash-error { background: rgba(255,107,107,.1); border: 1px solid rgba(255,107,107,.4); color: #ffb4b4; }
.flash-ok { background: rgba(61,220,151,.1); border: 1px solid rgba(61,220,151,.35); color: var(--ok); }

/* ---------- history table ---------- */
.history { width: 100%; border-collapse: collapse; font-size: 14px; }
.history th {
  text-align: left; font: 600 11px "Inter", sans-serif; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted); padding: 0 12px 10px; border-bottom: 1px solid var(--line);
}
.history td { padding: 11px 12px; border-bottom: 1px solid rgba(36,52,74,.5); }
.history tr:last-child td { border-bottom: 0; }
.history td.mono { font-size: 13px; }
.totals { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); }

/* ---------- login ---------- */
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card {
  width: 100%; max-width: 360px; background: var(--surface);
  border: 1px solid var(--line); border-radius: 14px; padding: 34px 30px;
}
.login-mark {
  font-family: "Space Grotesk", sans-serif; font-weight: 700; letter-spacing: .12em;
  font-size: 18px; text-align: center;
}
.login-sub { color: var(--muted); font-size: 13px; text-align: center; margin: 8px 0 22px; }
.login-card .field { margin-bottom: 16px; }
.login-card .field span { font-size: 13px; }
.login-card input {
  background: var(--surface-2); border: 1px solid var(--line); color: var(--text);
  border-radius: 8px; padding: 11px 13px; font: 400 15px "Inter", sans-serif;
}

@media (max-width: 620px) {
  .tariff { grid-template-columns: 1fr; gap: 8px; }
  .ledger { justify-content: flex-start; }
  .issue .field, .field-grow { flex: 1 1 100%; }
  .field input, .field select { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  .bar-fill { animation: none; }
  .btn { transition: none; }
}
:focus-visible { outline: 2px solid var(--data); outline-offset: 2px; }