:root {
  color: #2f3a48;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  line-height: 1.45;
  --blue: #258dcc;
  --purple: #714db3;
  --green: #58bc72;
  --border: #dfe3e7;
  --muted: #f5f7f9;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  margin: 0;
  background: linear-gradient(135deg, #5e7ae9 0%, #704fb4 55%, #58438f 100%);
}

button,
input {
  font: inherit;
}

.page-shell {
  min-height: 100vh;
  padding: 22px;
}

.calculator-card {
  width: min(1200px, 100%);
  margin: 0 auto;
  overflow: hidden;
  background: #fff;
  border-radius: 19px;
  box-shadow: 0 22px 60px rgb(32 32 85 / 28%);
}

.hero {
  padding: 31px 24px 28px;
  color: #fff;
  text-align: center;
  background: linear-gradient(120deg, #2a4f6d, #2298d0);
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.35rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.hero p {
  margin: 10px 0 0;
  font-size: clamp(0.9rem, 2vw, 1.12rem);
}

.content {
  display: grid;
  gap: 46px;
  padding: 30px;
}

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

h2 {
  color: #17202b;
  font-size: 1.48rem;
}

.sharing-guide {
  display: grid;
  gap: 11px;
  padding: 18px;
  color: #fff;
  background: linear-gradient(120deg, #6677df, #7549af);
  border-radius: 10px;
}

.sharing-guide h2 {
  margin-bottom: 1px;
  color: #fff;
  text-align: center;
}

.guide-step {
  padding: 12px 13px;
  background: rgb(255 255 255 / 11%);
  border-radius: 8px;
}

.guide-step h3 {
  margin-bottom: 4px;
  color: #fff493;
  font-size: 1.05rem;
}

.guide-step p {
  margin-bottom: 1px;
  font-size: 0.92rem;
}

.formula {
  margin-top: 7px;
  padding: 4px 8px;
  background: rgb(83 196 137 / 24%);
  border-radius: 4px;
}

.calculator-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 28px;
}

.panel {
  padding: 24px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 13px;
  box-shadow: 0 2px 8px rgb(27 38 50 / 4%);
}

.input-panel {
  display: grid;
  align-content: start;
  gap: 19px;
  background: #f8fafc;
}

.panel h2 {
  margin-bottom: 0;
}

.field {
  position: relative;
  display: grid;
  gap: 7px;
  padding: 14px;
  border: 1px dashed #9da4aa;
  border-radius: 10px;
}

.field-primary {
  border: 2px solid #3ca0df;
  background: linear-gradient(110deg, rgb(58 158 220 / 9%), rgb(118 75 179 / 8%));
}

.field > span {
  font-weight: 750;
}

.field small {
  position: absolute;
  top: -10px;
  right: 9px;
  padding: 2px 8px;
  color: #555c64;
  background: #f8fafc;
  border-radius: 8px;
}

.field input {
  width: 100%;
  padding: 10px 12px;
  color: #111820;
  background: #fff;
  border: 1px solid #d7dade;
  border-radius: 8px;
  box-shadow: inset 0 1px 2px rgb(21 28 36 / 4%);
  outline: none;
}

.field input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgb(37 141 204 / 16%);
}

.field em {
  color: #7b8188;
  font-size: 0.77rem;
}

.breakdown-list {
  margin: 10px 0 24px;
}

.breakdown-list > div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid #eceff1;
}

.breakdown-list dt,
.breakdown-list dd {
  margin: 0;
}

.breakdown-list dd {
  font-weight: 750;
  white-space: nowrap;
}

.breakdown-list .net-profit {
  padding-top: 15px;
  font-weight: 800;
}

.net-profit.is-loss dd {
  color: #bd2e2e;
}

.distribution {
  padding: 18px;
  color: #fff;
  background: linear-gradient(120deg, #50b569, #65c779);
  border-radius: 10px;
}

.distribution.is-loss {
  background: linear-gradient(120deg, #d66b55, #c44b4b);
}

.distribution h3 {
  margin-bottom: 11px;
  font-size: 1.22rem;
}

.distribution p {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 5px;
}

.chart-panel {
  padding: 25px;
  background: #f7f8fa;
  border-radius: 11px;
}

.chart-layout {
  display: grid;
  grid-template-columns: minmax(250px, 1.2fr) minmax(250px, 0.8fr);
  align-items: center;
  gap: 30px;
}

.donut {
  display: block;
  width: min(390px, 100%);
  margin: 0 auto;
  filter: drop-shadow(0 6px 12px rgb(34 45 55 / 8%));
}

.chart-segment {
  transition: stroke-dasharray 220ms ease, stroke-dashoffset 220ms ease;
}

.legend {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.88rem;
}

.legend li::before {
  display: inline-block;
  width: 13px;
  height: 13px;
  margin-right: 7px;
  vertical-align: -1px;
  content: "";
  background: var(--legend);
  border-radius: 50%;
}

.roles {
  padding: 26px;
  color: #fff;
  background: linear-gradient(120deg, #dc78e6, #df5d7a);
  border-radius: 12px;
}

.roles > h2 {
  margin-bottom: 18px;
  color: #fff;
  text-align: center;
  font-size: 1.85rem;
}

.role-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 25px;
}

.role-card {
  display: flex;
  flex-direction: column;
  min-height: 342px;
  padding: 25px;
  background: rgb(255 255 255 / 11%);
  border-radius: 11px;
}

.role-card h3 {
  margin-bottom: 11px;
  font-size: 1.28rem;
}

.role-card ul {
  display: grid;
  gap: 5px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.role-card li::before {
  margin-right: 7px;
  color: #69dc8c;
  font-weight: 900;
  content: "✓";
}

.role-card > strong {
  margin-top: auto;
  padding: 9px 11px;
  background: rgb(255 255 255 / 16%);
  border-radius: 7px;
}

@media (max-width: 820px) {
  .page-shell {
    padding: 12px;
  }

  .content {
    gap: 28px;
    padding: 18px;
  }

  .calculator-grid,
  .chart-layout,
  .role-grid {
    grid-template-columns: 1fr;
  }

  .role-card {
    min-height: auto;
  }
}

@media (max-width: 520px) {
  .page-shell {
    padding: 0;
  }

  .calculator-card {
    border-radius: 0;
  }

  .hero {
    padding: 27px 16px;
  }

  .content {
    padding: 14px;
  }

  .panel,
  .chart-panel,
  .roles {
    padding: 17px;
  }

  .sharing-guide {
    padding: 12px;
  }

  .breakdown-list > div {
    gap: 10px;
    font-size: 0.88rem;
  }

  .distribution p {
    font-size: 0.9rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .chart-segment {
    transition: none;
  }
}