:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #131722;
  --muted: #5d6472;
  --primary: #265dff;
  --primary-ink: #ffffff;
  --border: #e6e9f0;
  --success: #0d8a52;
  --error: #b42318;
  --shadow: 0 8px 30px rgba(13, 24, 55, 0.08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f4f6ff 0%, var(--bg) 30%, var(--bg) 100%);
  line-height: 1.5;
}

.container { max-width: 1120px; margin: 0 auto; padding: 1rem; }

.hero {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1rem;
  padding-top: 2rem;
}
.badge {
  display: inline-block;
  background: #e9efff;
  color: #0d3bbb;
  border: 1px solid #d3dfff;
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
  font-size: 0.8rem;
  font-weight: 600;
}
h1 { margin: 0.6rem 0; font-size: clamp(1.8rem, 3.2vw, 2.8rem); line-height: 1.15; }
.hero-copy { color: var(--muted); max-width: 68ch; }
.hero-points { padding-left: 1rem; margin: 0.8rem 0 0; }
.hero-card {
  background: radial-gradient(circle at top right, #dde7ff, #fff);
  border: 1px solid #d7e0fa;
  border-radius: 16px;
  padding: 1rem;
  box-shadow: var(--shadow);
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
  padding-bottom: 2rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem;
  box-shadow: var(--shadow);
}

.card h2 { margin-top: 0; font-size: 1.2rem; }
.card h3 { font-size: 0.95rem; margin-bottom: 0.4rem; }

.field-row { margin-bottom: 0.75rem; display: grid; gap: 0.3rem; }
label { font-weight: 600; font-size: 0.92rem; }
input, select, textarea {
  width: 100%;
  border: 1px solid #cfd6e6;
  border-radius: 10px;
  padding: 0.58rem 0.65rem;
  font: inherit;
  background: #fff;
}
input:focus, select:focus, textarea:focus {
  outline: 2px solid #b5c9ff;
  border-color: #7092ff;
}

.toggle-grid {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 0.9rem;
}
.toggle-grid label { font-weight: 500; display: flex; gap: 0.45rem; align-items: center; }

.actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }
button { border: none; cursor: pointer; font: inherit; }
.btn-primary, .btn-secondary {
  padding: 0.6rem 0.9rem;
  border-radius: 10px;
  font-weight: 700;
}
.btn-primary { background: var(--primary); color: var(--primary-ink); }
.btn-secondary { background: #eef2ff; color: #1c3fa8; border: 1px solid #cbd6ff; }

.results-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 0.7rem;
}
.results-grid article {
  border: 1px solid #e4e8f2;
  background: #f9fbff;
  border-radius: 12px;
  padding: 0.7rem;
}
.results-grid p {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 800;
  color: #112a84;
}

.formula-box {
  margin-top: 0.9rem;
  padding: 0.8rem;
  border: 1px dashed #cad3ea;
  border-radius: 12px;
  background: #fafcff;
}

.scenario-list {
  display: grid;
  gap: 0.6rem;
}
.scenario-item {
  border: 1px solid #dfe4f2;
  border-radius: 12px;
  padding: 0.7rem;
  display: flex;
  justify-content: space-between;
  gap: 0.7rem;
}
.scenario-meta { color: var(--muted); font-size: 0.88rem; }
.scenario-actions { display: flex; gap: 0.45rem; }

.muted { color: var(--muted); font-size: 0.92rem; }
.error {
  color: var(--error);
  background: #feeef0;
  border: 1px solid #f8c6ce;
  border-radius: 10px;
  padding: 0.6rem;
  margin: 0.6rem 0;
}
.hidden { display: none; }

.disclaimer {
  margin-top: 1rem;
  padding: 0.75rem;
  border-left: 4px solid #f59e0b;
  background: #fff8ea;
  border-radius: 8px;
}

.cta { grid-column: 1 / -1; }
.footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  padding-bottom: 2rem;
}

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .grid { grid-template-columns: 1fr; }
}