:root {
  --bg: #171717;
  --panel: #222220;
  --card: #2b2b29;
  --card-border: #444440;
  --text: #f4f4f2;
  --muted: #b9b9b4;
  --line: #454540;
  --blue: #3b8cff;
  --blue-soft: #9ec5ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  padding: 18px;
}

.app {
  max-width: 1060px;
  margin: 0 auto;
}

.controls {
  background: var(--panel);
  border-radius: 14px;
  padding: 22px 28px;
  margin-bottom: 32px;
  display: grid;
  gap: 18px;
}

.control-row {
  display: grid;
  grid-template-columns: 230px 1fr 110px;
  align-items: center;
  gap: 18px;
}

label {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}

input[type="range"] {
  width: 100%;
  accent-color: #6a6a66;
}

input[type="text"] {
  width: 100%;
  background: #1b1b1a;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  color: var(--text);
  text-align: right;
  font-size: 18px;
  font-weight: 700;
  outline: none;
  padding: 10px 12px;
}

input[type="text"]:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 2px rgba(59, 140, 255, 0.18);
}

.summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 34px;
}

.summary-card {
  background: var(--panel);
  border-radius: 10px;
  padding: 22px 24px;
  min-height: 95px;
}

.summary-card .label {
  color: var(--text);
  font-size: 18px;
  margin-bottom: 6px;
}

.summary-card .value {
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
}

.tier {
  margin-bottom: 32px;
}

.tier-title {
  font-size: 18px;
  font-weight: 800;
  margin: 0 0 12px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.model-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 24px;
  min-height: 245px;
  position: relative;
}

.model-card.lowest {
  border: 2px solid var(--blue);
  box-shadow: 0 0 0 1px rgba(59, 140, 255, 0.12);
}

.provider {
  font-size: 17px;
  font-weight: 700;
  color: var(--muted);
  line-height: 1.2;
}

.model {
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 20px;
}

.row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
}

.cost-call {
  font-size: 19px;
  color: var(--muted);
  font-weight: 800;
  margin-bottom: 12px;
}

.divider {
  height: 1px;
  background: var(--line);
  margin: 12px 0 16px;
}

.monthly {
  font-size: 31px;
  font-weight: 900;
  margin-bottom: 8px;
}

.annual {
  font-size: 22px;
  color: var(--muted);
  font-weight: 800;
  margin-bottom: 16px;
}

.suffix {
  color: var(--muted);
  font-size: 17px;
  font-weight: 700;
}

.rates {
  color: var(--muted);
  font-size: 16px;
  font-weight: 700;
}

.badge {
  color: var(--blue-soft);
  font-size: 14px;
  font-weight: 800;
  margin-top: 10px;
}

.footer-note {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  margin-top: 24px;
}

@media (max-width: 850px) {
  body { padding: 12px; }

  .control-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  input[type="text"] {
    text-align: left;
  }

  .summary,
  .cards {
    grid-template-columns: 1fr;
  }

  .controls {
    padding: 18px;
  }
}