* {
  box-sizing: border-box;
}

:root {
  --bg: #0c0c0c;
  --panel: #161616;
  --panel-soft: #1b1b1b;
  --text: #e8e8e8;
  --muted: #a5a5a5;
  --accent: #ff3b30;
  --line: rgba(255, 255, 255, 0.12);
  --radius: 8px;
  --width: 1100px;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    "Noto Sans JP",
    Arial,
    sans-serif;
  background:
    repeating-linear-gradient(
      135deg,
      rgba(255, 255, 255, 0.012) 0,
      rgba(255, 255, 255, 0.012) 1px,
      transparent 1px,
      transparent 28px
    ),
    linear-gradient(180deg, #0a0a0a 0%, #101010 42%, #151515 100%);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 72px;
  padding: 0 max(18px, calc((100vw - var(--width)) / 2 + 18px));
  border-bottom: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.82);
  backdrop-filter: blur(12px);
}

.brand,
.site-nav,
.site-footer {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
  color: #fff;
  font-size: 15px;
  font-weight: 850;
  letter-spacing: 0.08em;
}

.brand img {
  width: 48px;
  height: 48px;
}

.site-nav {
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-nav a,
.site-footer a {
  padding: 8px 10px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 750;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-footer a:hover,
.site-footer a:focus-visible {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  outline: none;
}

.members-hero,
.section {
  width: min(100%, var(--width));
  margin: 0 auto;
  padding-inline: 18px;
}

.members-hero {
  padding-top: clamp(54px, 8vw, 92px);
  padding-bottom: 28px;
}

.kicker {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.18em;
}

.members-hero h1 {
  margin: 0;
  color: #fff;
  font-size: clamp(42px, 8vw, 84px);
  line-height: 1;
  letter-spacing: 0;
}

.members-hero p:not(.kicker) {
  max-width: 42em;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
}

.section {
  padding-top: 18px;
}

.member-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.member-card,
.members-empty {
  border: 1px solid #232323;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel-soft), var(--panel));
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.member-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 18px;
}

.member-card__summary {
  display: flex;
  gap: 12px;
  align-items: start;
}

.member-card__index {
  flex: 0 0 auto;
  margin: 2px 0 0;
  color: rgba(255, 180, 173, 0.92);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.member-card h2 {
  margin: 0;
  color: #fff;
  font-size: 20px;
  line-height: 1.35;
}

.member-card__role {
  margin: 4px 0 0;
  color: rgba(255, 180, 173, 0.82);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.member-card__intro {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.78;
}

.member-card__details {
  margin-top: auto;
  padding-top: 16px;
}

.member-card__details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 999px;
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  list-style: none;
}

.member-card__details summary::-webkit-details-marker {
  display: none;
}

.member-card__details summary::after {
  content: "+";
  color: rgba(255, 180, 173, 0.92);
  font-size: 17px;
  line-height: 1;
}

.member-card__details[open] summary::after {
  content: "-";
}

.member-card__details summary:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.78);
  outline-offset: 3px;
}

.member-work-list {
  display: grid;
  gap: 10px;
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.member-work {
  display: grid;
  gap: 4px;
  padding: 11px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.member-work__title {
  color: #fff;
  font-size: 14px;
  font-weight: 800;
}

.member-work__role,
.member-work--empty,
.members-empty {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}

.members-empty {
  grid-column: 1 / -1;
  padding: 20px;
}

.site-footer {
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 70px 18px 32px;
}

@media (max-width: 780px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    padding-block: 12px;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .member-list {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}