:root {
  color-scheme: light;
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #17202a;
  --muted: #536171;
  --border: #d9dee5;
  --accent: #1f5f8b;
  --accent-dark: #16486a;
  --header: #101820;
}

* {
  box-sizing: border-box;
}

html {
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
  background: var(--bg);
  color: var(--text);
}

body {
  margin: 0;
}

.wrap {
  width: min(100% - 32px, 1040px);
  margin: 0 auto;
}

.site-header {
  background: var(--header);
  color: #ffffff;
  border-bottom: 4px solid var(--accent);
}

.header-content {
  padding: 56px 0 48px;
}

.eyebrow {
  margin: 0 0 10px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2 {
  line-height: 1.2;
}

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(2.1rem, 5vw, 4rem);
  font-weight: 700;
}

.hero-subtitle {
  max-width: 760px;
  margin: 18px 0 0;
  color: #d9e3eb;
  font-size: 1.22rem;
  line-height: 1.45;
}

h2 {
  margin: 0 0 16px;
  font-size: 1.45rem;
}

main {
  padding: 32px 0 48px;
}

section {
  margin: 0 0 32px;
}

p {
  max-width: 820px;
  margin: 0 0 14px;
}

.status-block {
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 5px solid var(--accent);
}

.status-block dl {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin: 0;
}

.status-block dt {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
}

.status-block dd {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.intro {
  padding-top: 4px;
}

.flow-section {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.concept-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.concept-flow li {
  position: relative;
  min-height: 92px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  text-align: center;
  background: #f9fafb;
  border: 1px solid var(--border);
  border-radius: 4px;
}

.concept-flow li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -20px;
  width: 12px;
  height: 12px;
  border-top: 2px solid var(--accent);
  border-right: 2px solid var(--accent);
  transform: translateY(-50%) rotate(45deg);
}

.concept-flow span {
  color: var(--text);
  font-weight: 700;
}

.caption {
  max-width: 760px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.provide-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  max-width: none;
  margin: 0;
  padding: 0;
  list-style: none;
}

.provide-list li {
  min-height: 88px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-weight: 700;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.link-grid a {
  min-height: 112px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  padding: 18px;
  color: var(--text);
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.link-grid a:hover,
.link-grid a:focus-visible {
  border-color: var(--accent);
  outline: 3px solid rgba(31, 95, 139, 0.18);
  outline-offset: 1px;
}

.link-grid span {
  color: var(--accent-dark);
  font-weight: 700;
}

.link-grid small {
  color: var(--muted);
  font-size: 0.92rem;
}

ul:not(.provide-list) {
  max-width: 760px;
  margin: 0;
  padding-left: 22px;
}

li + li {
  margin-top: 6px;
}

.site-footer {
  padding: 24px 0;
  color: #ffffff;
  background: var(--header);
}

.site-footer p {
  margin: 0 0 6px;
  font-size: 0.95rem;
}

.site-footer a {
  color: #ffffff;
}

@media (max-width: 900px) {
  .provide-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .header-content {
    padding: 40px 0 36px;
  }

  .hero-subtitle {
    font-size: 1.08rem;
  }

  .status-block dl,
  .link-grid,
  .provide-list {
    grid-template-columns: 1fr;
  }

  .flow-section {
    padding: 18px;
  }

  .concept-flow {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .concept-flow li {
    min-height: 76px;
  }

  .concept-flow li:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: -18px;
    transform: translateX(50%) rotate(135deg);
  }

  .link-grid a,
  .provide-list li {
    min-height: auto;
  }
}