:root {
  color-scheme: light;
  --ink: #141414;
  --muted: #5f6368;
  --line: #d8dde3;
  --surface: #ffffff;
  --surface-soft: #f4f7fa;
  --accent: #0f766e;
  --accent-strong: #0b5f59;
  --warning: #8a4b00;
  --track: #b74330;
  --track-dark: #843225;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--surface);
  color: var(--ink);
  line-height: 1.65;
}

a {
  color: inherit;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner,
.page,
.method-body {
  width: min(100% - 32px, 1040px);
  margin: 0 auto;
}

.header-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-weight: 800;
  font-size: 1.08rem;
  text-decoration: none;
  letter-spacing: 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.92rem;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
}

.nav a[aria-current="page"],
.nav a:hover {
  color: var(--ink);
}

.page {
  padding: 32px 0 56px;
}

.home-grid,
.wind-grid {
  display: grid;
  gap: 28px;
  align-items: stretch;
}

.home-grid {
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
}

.wind-grid {
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
}

.lead-block {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 420px;
}

.kicker {
  margin: 0 0 12px;
  color: var(--accent-strong);
  font-size: 0.9rem;
  font-weight: 700;
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(2.3rem, 8vw, 5.4rem);
  line-height: 1;
  letter-spacing: 0;
}

.compact-title {
  font-size: clamp(2rem, 6vw, 3.6rem);
}

.lead {
  max-width: 620px;
  margin-bottom: 28px;
  color: #34383d;
  font-size: 1.06rem;
}

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

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  padding: 10px 16px;
  background: var(--ink);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

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

.button:disabled {
  border-color: #aab1b9;
  background: #d7dce2;
  color: #5f6670;
  cursor: not-allowed;
}

.track-panel {
  min-height: 420px;
  border-radius: 8px;
  overflow: hidden;
  position: relative;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.9) 0 2px, transparent 2px 100%),
    linear-gradient(180deg, var(--track), var(--track-dark));
  background-size: 22% 100%, 100% 100%;
}

.track-panel::before {
  content: "";
  position: absolute;
  inset: 22px;
  border: 2px solid rgba(255, 255, 255, 0.82);
  border-radius: 50%;
}

.track-panel::after {
  content: "100m / 200m";
  position: absolute;
  right: 18px;
  bottom: 16px;
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.9rem;
  font-weight: 800;
}

.tool-panel,
.result-panel,
.method-note {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.tool-panel,
.result-panel {
  padding: 20px;
}

.field-stack {
  display: grid;
  gap: 16px;
}

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

label,
.label {
  font-size: 0.86rem;
  font-weight: 700;
  color: #2d3136;
}

input,
select {
  width: 100%;
  min-height: 44px;
  border: 1px solid #b9c0c8;
  border-radius: 6px;
  padding: 10px 12px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.segment {
  min-height: 44px;
  border: 1px solid #b9c0c8;
  border-radius: 6px;
  display: grid;
  place-items: center;
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-weight: 800;
}

.segment.active {
  border-color: var(--accent);
  background: #dff3ee;
  color: var(--accent-strong);
}

.segment:disabled {
  background: #eef1f4;
  color: #717882;
}

.form-message {
  min-height: 1.5em;
  margin: -4px 0 0;
  color: var(--warning);
  font-size: 0.9rem;
}

.detail-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0;
  background: var(--surface-soft);
}

.detail-panel summary {
  min-height: 44px;
  padding: 10px 12px;
  cursor: pointer;
  font-weight: 800;
}

.detail-fields {
  display: grid;
  gap: 14px;
  padding: 0 12px 14px;
}

.result-value {
  margin: 14px 0 6px;
  font-size: clamp(3.2rem, 12vw, 6.8rem);
  line-height: 0.95;
  font-weight: 900;
  letter-spacing: 0;
}

.result-caption,
.small {
  color: var(--muted);
  font-size: 0.92rem;
}

.result-warning {
  margin: 12px 0 0;
  border: 1px solid #e2bf8a;
  border-radius: 6px;
  padding: 10px 12px;
  background: #fff8ed;
  color: var(--warning);
  font-size: 0.9rem;
}

.result-summary {
  display: grid;
  grid-template-columns: minmax(150px, 0.7fr) minmax(220px, 1.3fr);
  gap: 12px;
  margin-top: 24px;
}

.result-summary > div {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--surface-soft);
}

.result-summary strong {
  display: block;
  margin-top: 4px;
  font-size: clamp(1.1rem, 3vw, 1.55rem);
  line-height: 1.25;
}

.condition-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 12px;
  margin-top: 22px;
}

.condition {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.condition strong {
  display: block;
  font-size: 1.2rem;
  overflow-wrap: anywhere;
}

.result-method-link {
  margin: 20px 0 0;
}

.method-hero {
  padding: 38px 0 18px;
  background: var(--surface-soft);
  border-bottom: 1px solid var(--line);
}

.method-body {
  padding: 32px 0 56px;
  display: grid;
  gap: 22px;
}

.method-section {
  max-width: 760px;
  min-width: 0;
}

.method-section h2 {
  margin-bottom: 8px;
  font-size: 1.25rem;
}

.formula {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-weight: 700;
}

.formula-block {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px;
  background: var(--surface-soft);
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.98rem;
  white-space: nowrap;
}

.source-list {
  margin: 0;
  padding-left: 1.2rem;
}

.source-list li + li {
  margin-top: 8px;
}

.source-list a {
  overflow-wrap: anywhere;
}

.method-note {
  padding: 18px;
  max-width: 760px;
  min-width: 0;
  color: var(--warning);
  background: #fff8ed;
  border-color: #e2bf8a;
}

@media (max-width: 760px) {
  .header-inner,
  .page,
  .method-body {
    width: min(100% - 24px, 1040px);
  }

  .header-inner {
    min-height: 58px;
  }

  .nav {
    gap: 12px;
    font-size: 0.86rem;
  }

  .home-grid,
  .wind-grid {
    grid-template-columns: 1fr;
  }

  .lead-block,
  .track-panel {
    min-height: auto;
  }

  .track-panel {
    aspect-ratio: 1.25;
  }

  .result-summary {
    grid-template-columns: 1fr;
  }

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

  .condition strong {
    font-size: 1.08rem;
  }
}

.site-footer {
  margin-top: 56px;
  border-top: 1px solid var(--line);
  padding: 20px 24px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--muted);
}