:root {
  color-scheme: light;
  --bg: #f5f7f2;
  --surface: #ffffff;
  --surface-muted: #eef2e8;
  --ink: #17201d;
  --muted: #63706a;
  --line: #d8dfd8;
  --accent: #1f7a70;
  --accent-dark: #12524c;
  --amber: #b86d25;
  --error: #9f2f27;
  --shadow: 0 24px 60px rgba(23, 32, 29, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

button,
input {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

.is-hidden {
  display: none !important;
}

.lock-screen {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.lock-panel {
  width: min(100%, 460px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: clamp(24px, 5vw, 40px);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 22px;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 4px;
  font-size: 1rem;
  letter-spacing: 0;
}

.access-form label,
.field span {
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 700;
}

.password-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  margin-top: 8px;
}

.password-row input,
.field input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  padding: 10px 12px;
  outline: none;
}

.password-row input:focus,
.field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(31, 122, 112, 0.16);
}

.password-row button,
.secondary-button {
  min-height: 44px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  padding: 0 18px;
}

.secondary-button {
  background: var(--surface-muted);
  color: var(--ink);
  border: 1px solid var(--line);
}

.access-message,
.validation-message {
  min-height: 22px;
  margin: 12px 0 0;
  color: var(--error);
  font-size: 0.9rem;
}

.app {
  width: min(1440px, 100%);
  margin: 0 auto;
  padding: 28px;
}

.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}

.app-header h1 {
  max-width: 900px;
  margin-bottom: 0;
}

.header-actions {
  display: grid;
  justify-items: end;
  gap: 8px;
}

.site-credit {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: right;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(300px, 420px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 12px 32px rgba(23, 32, 29, 0.07);
  padding: 18px;
}

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.panel-heading p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: right;
}

.version-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 18px;
}

.version-switch button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-muted);
  color: var(--muted);
  font-weight: 800;
}

.version-switch button.is-active {
  border-color: var(--accent);
  background: #e4f2ef;
  color: var(--accent-dark);
}

.input-grid {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
}

.unit-input {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 68px;
  gap: 8px;
}

.unit-input button {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-muted);
  color: var(--accent-dark);
  font-weight: 800;
}

.unit-input button:hover {
  border-color: var(--accent);
  background: #e4f2ef;
}

.field small {
  color: var(--muted);
  font-size: 0.78rem;
}

.formula-box {
  display: grid;
  gap: 10px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.formula-box div {
  display: grid;
  gap: 2px;
}

.formula-box span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.formula-box strong {
  overflow-wrap: anywhere;
  font-size: 0.9rem;
}

.formula-box mjx-container {
  margin: 0 !important;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.metric {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-muted);
  padding: 14px;
}

.metric span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.metric strong {
  display: block;
  min-height: 34px;
  overflow-wrap: anywhere;
  font-size: clamp(1.05rem, 2vw, 1.45rem);
  line-height: 1.15;
}

.metric.emphasis {
  border-color: #d7a36d;
  background: #fff3e6;
}

.metric.emphasis strong {
  color: var(--amber);
}

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

.chart-mode-switch,
.range-control {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.range-control span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.chart-mode-switch button,
.range-control button {
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-muted);
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 800;
  padding: 0 12px;
}

.chart-mode-switch button.is-active,
.range-control button.is-active {
  border-color: var(--accent);
  background: #e4f2ef;
  color: var(--accent-dark);
}

.chart-wrap {
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 920 / 440;
}

.method-panel {
  margin-top: 18px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

th,
td {
  border-top: 1px solid var(--line);
  padding: 11px 12px;
  text-align: left;
  font-size: 0.92rem;
}

thead th {
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
}

tbody th {
  color: var(--accent-dark);
}

@media (max-width: 980px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .app {
    padding: 18px;
  }

  .app-header {
    align-items: stretch;
    flex-direction: column;
  }

  .header-actions {
    justify-items: start;
  }

  .site-credit {
    text-align: left;
  }

  .panel-heading {
    display: block;
  }

  .panel-heading p {
    margin-top: 4px;
    text-align: left;
  }

  .metric-grid {
    grid-template-columns: 1fr;
  }

  .chart-controls {
    align-items: stretch;
    flex-direction: column;
  }

  .password-row {
    grid-template-columns: 1fr;
  }
}