:root {
  --bg: #f4efe7;
  --panel: rgba(255, 250, 243, 0.7);
  --text: #231815;
  --muted: #75675c;
  --accent: #9f6f2b;
  --accent-deep: #6e4717;
  --shadow: 0 24px 60px rgba(65, 43, 13, 0.12);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 251, 244, 0.92), transparent 36%),
    radial-gradient(circle at 85% 18%, rgba(229, 198, 151, 0.28), transparent 24%),
    linear-gradient(145deg, var(--bg) 0%, #efe5d7 42%, #eadcc8 100%);
}

.shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px;
  padding-bottom: max(28px, env(safe-area-inset-bottom));
}

.hero-card {
  width: min(1120px, 100%);
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(340px, 520px);
  gap: 28px;
  padding: 32px;
  border: 1px solid rgba(255, 255, 255, 0.46);
  border-radius: 40px;
  background: linear-gradient(135deg, rgba(255, 249, 241, 0.7), rgba(255, 252, 248, 0.52));
  backdrop-filter: blur(18px) saturate(135%);
  -webkit-backdrop-filter: blur(18px) saturate(135%);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.hero-card::before,
.hero-card::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  pointer-events: none;
}

.hero-card::before {
  width: 260px;
  height: 260px;
  right: -72px;
  top: -112px;
  background: radial-gradient(circle, rgba(211, 177, 123, 0.34) 0%, rgba(211, 177, 123, 0) 72%);
}

.hero-card::after {
  width: 340px;
  height: 340px;
  left: -148px;
  bottom: -182px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.44) 0%, rgba(255, 255, 255, 0) 72%);
}

.hero-copy,
.calculator-card {
  position: relative;
  z-index: 1;
}

.hero-copy {
  padding: 12px 8px 12px 6px;
  align-self: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 251, 246, 0.76);
  border: 1px solid rgba(123, 93, 46, 0.08);
  color: var(--accent-deep);
  font-size: 12px;
  letter-spacing: 0.22em;
}

h1 {
  margin: 18px 0 14px;
  font-family: "Noto Serif SC", serif;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.08;
  letter-spacing: 0.02em;
  font-weight: 700;
}

.hero-text,
.hero-note {
  margin: 0;
  max-width: 36rem;
}

.hero-text {
  font-size: 18px;
  line-height: 1.8;
  color: rgba(35, 24, 21, 0.86);
}

.hero-note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.calculator-card {
  border-radius: var(--radius-xl);
  padding: 24px;
  background: linear-gradient(180deg, rgba(255, 253, 249, 0.92), rgba(254, 249, 242, 0.8));
  border: 1px solid rgba(146, 111, 56, 0.12);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.76), 0 22px 44px rgba(104, 74, 32, 0.08);
}

.calculator-form {
  display: grid;
  gap: 16px;
}

.field {
  display: grid;
  gap: 10px;
}

.field-label {
  font-size: 14px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.input-wrap,
.select-wrap {
  position: relative;
}

.prefix {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent-deep);
  font-weight: 700;
}

input,
select {
  width: 100%;
  min-height: 60px;
  border: 1px solid rgba(142, 111, 67, 0.14);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.82);
  color: var(--text);
  font: inherit;
  padding: 0 18px;
  outline: none;
  transition: border-color 240ms var(--ease), box-shadow 240ms var(--ease), transform 240ms var(--ease);
}

input {
  padding-left: 42px;
  font-size: 20px;
  font-weight: 600;
}

select {
  appearance: none;
  cursor: pointer;
  font-size: 16px;
  padding-right: 52px;
}

.select-wrap::after {
  content: "";
  position: absolute;
  right: 22px;
  top: 50%;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--accent-deep);
  border-bottom: 2px solid var(--accent-deep);
  transform: translateY(-65%) rotate(45deg);
  pointer-events: none;
}

input:focus,
select:focus {
  border-color: rgba(159, 111, 43, 0.4);
  box-shadow: 0 0 0 4px rgba(159, 111, 43, 0.12);
  transform: translateY(-1px);
}

.result-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.result-card {
  display: grid;
  gap: 10px;
  padding: 18px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid rgba(141, 111, 67, 0.1);
  min-height: 144px;
  align-content: space-between;
}

.result-card.accent {
  background: linear-gradient(180deg, rgba(242, 222, 194, 0.78), rgba(255, 246, 233, 0.78));
}

.result-label {
  font-size: 14px;
  color: var(--muted);
}

.result-value {
  font-family: "Noto Serif SC", serif;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.15;
  word-break: break-word;
}

.result-sub {
  font-size: 13px;
  color: rgba(117, 103, 92, 0.92);
}

.formula-hint {
  margin: 18px 2px 0;
  padding-top: 18px;
  border-top: 1px solid rgba(145, 112, 64, 0.12);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

@media (max-width: 920px) {
  .hero-card {
    grid-template-columns: 1fr;
    padding: 22px;
  }

  .hero-copy {
    padding: 4px 2px 0;
  }

  .calculator-card {
    max-width: 100%;
  }
}

@media (max-width: 560px) {
  .shell {
    padding: 14px;
    padding-top: max(14px, env(safe-area-inset-top));
    padding-bottom: max(18px, env(safe-area-inset-bottom));
  }

  .hero-card {
    gap: 16px;
    padding: 16px;
    border-radius: 26px;
  }

  .calculator-card {
    padding: 16px;
    border-radius: 22px;
  }

  .result-panel {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  input,
  select {
    min-height: 54px;
  }

  h1 {
    margin: 14px 0 12px;
    font-size: clamp(30px, 11vw, 42px);
    line-height: 1.14;
  }

  .hero-text {
    font-size: 16px;
    line-height: 1.7;
  }

  .hero-note,
  .formula-hint,
  .field-label,
  .result-sub {
    font-size: 13px;
  }

  input {
    font-size: 18px;
  }

  .result-card {
    min-height: 124px;
    padding: 16px;
    border-radius: 18px;
  }

  .result-value {
    font-size: clamp(26px, 9vw, 34px);
  }

  .eyebrow {
    font-size: 11px;
    letter-spacing: 0.18em;
    padding: 7px 12px;
  }
}