:root {
  color-scheme: light;
  --ink: #17211c;
  --muted: #607067;
  --line: #d8dfda;
  --paper: #ffffff;
  --background: #eef2ef;
  --green: #174f3a;
  --green-dark: #0d3828;
  --gold: #bd7b21;
  --error: #9a2f28;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(23, 79, 58, 0.07), transparent 35%),
    var(--background);
}

.site-header,
main,
footer {
  width: min(1180px, calc(100% - 32px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding: 54px 0 32px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 12px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.2rem, 5vw, 4.4rem);
  line-height: 0.98;
  letter-spacing: -0.045em;
}

h2 {
  margin-bottom: 4px;
}

.eyebrow,
.step {
  margin-bottom: 7px;
  color: var(--green);
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.subtitle {
  max-width: 720px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.standard-badge {
  flex: none;
  padding: 10px 14px;
  border: 1px solid var(--green);
  border-radius: 999px;
  color: var(--green);
  font-size: 0.8rem;
  font-weight: 800;
}

main {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(340px, 0.75fr);
  gap: 24px;
  align-items: start;
}

form {
  display: grid;
  gap: 18px;
}

.card {
  border: 1px solid rgba(23, 33, 28, 0.09);
  border-radius: 18px;
  background: var(--paper);
  box-shadow: 0 14px 40px rgba(21, 45, 32, 0.07);
}

form .card,
.results {
  padding: 25px;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 20px;
}

.section-heading > p {
  max-width: 270px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: right;
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.gradation-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

label {
  display: grid;
  gap: 7px;
  color: #3d4a43;
  font-size: 0.8rem;
  font-weight: 700;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 9px;
  width: fit-content;
  margin-top: 16px;
  font-size: 0.88rem;
  cursor: pointer;
}

.checkbox-label input {
  width: 18px;
  height: 18px;
  accent-color: var(--green);
}

input {
  width: 100%;
  min-width: 0;
  padding: 11px 12px;
  border: 1px solid #bdc9c1;
  border-radius: 9px;
  color: var(--ink);
  background: #fbfcfb;
  font: inherit;
  font-size: 1rem;
}

input:focus {
  outline: 3px solid rgba(23, 79, 58, 0.15);
  border-color: var(--green);
}

.input-suffix {
  display: flex;
  align-items: center;
  border: 1px solid #bdc9c1;
  border-radius: 9px;
  overflow: hidden;
  background: #f1f4f2;
}

.input-suffix input {
  border: 0;
  border-radius: 0;
}

.input-suffix span {
  padding: 0 11px;
  color: var(--muted);
}

details {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

summary {
  cursor: pointer;
  color: var(--green);
  font-weight: 750;
}

details .input-grid {
  margin-top: 15px;
}

.help {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

.actions {
  display: flex;
  gap: 12px;
}

button {
  padding: 13px 20px;
  border: 1px solid var(--green);
  border-radius: 10px;
  color: #fff;
  background: var(--green);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

button:hover {
  background: var(--green-dark);
}

button.secondary {
  color: var(--green);
  background: transparent;
}

.form-error {
  padding: 13px 15px;
  border-left: 4px solid var(--error);
  border-radius: 8px;
  color: var(--error);
  background: #fff4f2;
}

.results {
  position: sticky;
  top: 20px;
  min-height: 350px;
}

#empty-result {
  color: var(--muted);
}

.symbol-row {
  display: flex;
  gap: 17px;
  align-items: center;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.symbol {
  display: grid;
  place-items: center;
  min-width: 88px;
  min-height: 78px;
  padding: 8px;
  border-radius: 13px;
  color: #fff;
  background: var(--green);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.55rem;
  font-weight: 800;
  text-align: center;
}

.symbol-label {
  display: block;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-align: center;
}

.result-description {
  margin-bottom: 0;
  color: var(--muted);
}

.metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 20px 0;
}

.metrics div {
  display: grid;
  gap: 5px;
  padding: 12px;
  border-radius: 10px;
  background: #f2f5f3;
}

.metrics span {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
}

#reasoning {
  padding-left: 22px;
  color: #39473f;
  font-size: 0.9rem;
  line-height: 1.5;
}

#reasoning li + li {
  margin-top: 7px;
}

.disclaimer {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.74rem;
  line-height: 1.5;
}

footer {
  padding: 30px 0 44px;
  color: var(--muted);
  font-size: 0.78rem;
  text-align: center;
}

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

  .results {
    position: static;
    grid-row: 1;
  }

  .gradation-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 34px;
  }

  .section-heading {
    flex-direction: column;
  }

  .section-heading > p {
    max-width: none;
    text-align: left;
  }

  .input-grid,
  .gradation-grid {
    grid-template-columns: 1fr 1fr;
  }

  form .card,
  .results {
    padding: 20px;
  }
}