:root {
  --bg: #f5f7f4;
  --surface: #ffffff;
  --ink: #18211c;
  --muted: #667064;
  --line: #dce3da;
  --brand: #0f766e;
  --brand-dark: #115e59;
  --accent: #f59e0b;
  --danger: #b42318;
  --shadow: 0 18px 50px rgba(24, 33, 28, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.08), transparent 36%),
    linear-gradient(315deg, rgba(245, 158, 11, 0.12), transparent 34%),
    var(--bg);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
}

button,
input {
  font: inherit;
}

.app-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 32px auto;
}

.app-header {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--brand);
  font-size: 0.84rem;
  font-weight: 700;
  text-transform: uppercase;
}

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

h1 {
  font-size: clamp(2rem, 5vw, 4.2rem);
  line-height: 0.98;
}

.rate-card,
.tab-panel,
.result-panel {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.rate-card {
  width: min(380px, 100%);
  padding: 18px;
}

.rate-card label {
  display: block;
  margin-bottom: 10px;
  color: var(--muted);
  font-weight: 700;
}

.rate-input {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
}

.rate-input input,
.entry-row input {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  outline: none;
}

.rate-input input {
  padding: 12px;
  text-align: right;
}

.tabs {
  display: inline-flex;
  gap: 6px;
  padding: 6px;
  margin: 14px 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.tab-button {
  border: 0;
  border-radius: 6px;
  padding: 12px 18px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 700;
}

.tab-button.active {
  background: var(--brand);
  color: #fff;
}

.tab-panel {
  display: none;
  padding: 24px;
}

.tab-panel.active {
  display: block;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}

.section-heading h2 {
  margin-bottom: 7px;
  font-size: 1.55rem;
}

.section-heading p {
  color: var(--muted);
  line-height: 1.5;
}

.entry-section {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.entry-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 12px;
}

.add-button,
.compare-button {
  border: 0;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  cursor: pointer;
  font-weight: 800;
}

.add-button {
  padding: 10px 14px;
}

.add-button:hover,
.compare-button:hover {
  background: var(--brand-dark);
}

.entry-list {
  display: grid;
  gap: 10px;
}

.entry-row {
  display: grid;
  grid-template-columns: minmax(140px, 1fr) minmax(130px, 220px) 42px;
  gap: 10px;
  align-items: center;
}

.entry-row input {
  min-height: 44px;
  padding: 11px 12px;
}

.amount-input {
  text-align: right;
}

.remove-button {
  width: 42px;
  height: 42px;
  border: 1px solid #f2c7c2;
  border-radius: 8px;
  background: #fff7f6;
  color: var(--danger);
  cursor: pointer;
  font-weight: 900;
}

.totals-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.totals-grid.single {
  grid-template-columns: 1fr;
}

.total-box {
  display: grid;
  gap: 8px;
  min-height: 104px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
}

.total-box span,
.result-panel span {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.total-box strong,
.result-panel strong {
  overflow-wrap: anywhere;
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.total-box.accent {
  border-color: rgba(15, 118, 110, 0.28);
  background: #ecfdf5;
}

.compare-button {
  width: 100%;
  min-height: 54px;
  margin-top: 18px;
  font-size: 1rem;
}

.result-panel {
  display: none;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
  padding: 20px;
}

.result-panel.show {
  display: grid;
}

.result-panel > div {
  display: grid;
  gap: 8px;
  min-height: 94px;
  padding: 18px;
  border-radius: 8px;
  background: #fff8eb;
  border: 1px solid rgba(245, 158, 11, 0.32);
}

@media (max-width: 760px) {
  .app-shell {
    width: min(100% - 20px, 1120px);
    margin: 18px auto;
  }

  .app-header,
  .entry-title,
  .section-heading {
    flex-direction: column;
    align-items: stretch;
  }

  .tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
  }

  .tab-button {
    padding-inline: 8px;
  }

  .tab-panel {
    padding: 18px;
  }

  .entry-row,
  .totals-grid,
  .result-panel {
    grid-template-columns: 1fr;
  }

  .entry-row {
    gap: 8px;
  }

  .remove-button {
    width: 100%;
  }
}