:root {
  --bg: #000000;
  --card: #3e3e3e;
  --text: #ffffff;
  --muted: #ababab;
  --line: #ababab;
  --ok: #16a34a;
  --warn: #f59e0b;
  --bad: #ef4444;
  --bar: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.shell {
  padding: 32px 16px;
  display: flex;
  justify-content: center;
}

.card {
  width: 100%;
  max-width: 720px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 18px 45px rgba(0,0,0,0.08);
}

.header h1 {
  margin: 0;
  font-size: 40px;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.45;
}

.field { margin-top: 18px; }

.labelRow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

label {
  font-weight: 600;
}

input {
  width: 100%;
  padding: 12px 14px;
  font-size: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  outline: none;
}

input:focus {
  border-color: #c7d2fe;
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.154);
}

.ghost {
  border: 1px solid var(--line);
  background: transparent;
  padding: 8px 10px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
}

.ghost:hover { background: #696969; }

.meterRow {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr 160px;
  gap: 14px;
  align-items: center;
}

.meterWrap {
  height: 12px;
  border-radius: 999px;
  background: #2c2d2d;
  overflow: hidden;
  border: 1px solid var(--line);
}

.meterBar {
  height: 100%;
  width: 0%;
  background: var(--bar);
  transition: width 140ms ease;
}

.scoreBox {
  text-align: right;
  display: grid;
  gap: 2px;
}

.label {
  font-size: 12px;
  color: var(--muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.score {
  font-size: 20px;
  font-weight: 800;
}

.learn {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.learn h2 {
  margin: 0 0 10px;
  font-size: 16px;
}

.checks {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.check {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #000000;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: #d1d5db;
  flex: 0 0 auto;
}

.check.good .dot { background: var(--ok); }
.check.good { background: #000000; border-color: #bbf7d0; }

.check.bad .dot { background: var(--bad); }
.check.bad { background: #000000; border-color: #fecaca; }

.footer {
  margin-top: 14px;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}