/* ==========================================================
   完全に理解した — ラボノートテーマ
   方眼紙・黄色マーカー・手描き風の枠線
   ========================================================== */
:root {
  /* 色（仕様 §6.1） */
  --bg: #f4f1ea;
  --ink: #1a1a1a;
  --ink-soft: #3c3a36;
  --muted: #6b6862;
  --blue: #1450d2;
  --blue-deep: #0e3ba0;
  --marker: #ffe36e;
  --orange: #f08a4b;
  --card: #ffffff;
  --grid: rgba(26, 26, 26, 0.07);
  --grid-major: rgba(26, 26, 26, 0.1);
  --dash: rgba(26, 26, 26, 0.28);

  /* カテゴリ色（サムネ背景） */
  --thumb-game: #fff3a6;
  --thumb-tool: #d2e0ff;
  --thumb-wip: #ffdcc6;

  /* フォント（最終決定は要決定。差し替えはここだけ） */
  --font-sans: 'Zen Maru Gothic', 'Hiragino Maru Gothic ProN', 'Noto Sans JP', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  /* 装飾（仕様 §6.3） */
  --line: 2px solid var(--ink);
  --radius-hand: 12px 14px 11px 13px / 13px 11px 14px 12px; /* 四隅を少しずらして手描き感 */
  --shadow-card: 0 8px 18px rgba(26, 26, 26, 0.08);
  --wrap: 1152px;
  --gutter: 24px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 500;
  color: var(--ink);
  line-height: 1.8;
  background-color: var(--bg);
  /* 方眼（細線 24px / 太線 120px） */
  background-image:
    linear-gradient(var(--grid-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--blue);
}
:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}
img {
  max-width: 100%;
}

.mono {
  font-family: var(--font-mono);
}
.wrap {
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 100;
  padding: 8px 14px;
  background: var(--ink);
  color: #fff;
  font-weight: 700;
  border-radius: 8px;
}
.skip-link:focus {
  top: 12px;
}

/* 黄色マーカー（見出しの下半分に敷く） */
.marker {
  background: linear-gradient(transparent 46%, var(--marker) 46%);
  padding: 0 0.08em;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

/* 手描き風カード */
.card {
  background: var(--card);
  border: var(--line);
  border-radius: var(--radius-hand);
}

/* ---------- ヘッダー ---------- */
.site-header {
  padding-top: 28px;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 52px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 900;
  font-size: 22px;
  line-height: 1;
}
.brand svg {
  flex-shrink: 0;
  color: var(--blue);
}
.nav {
  display: flex;
  gap: 8px;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  white-space: nowrap;
}
.nav-link:hover {
  color: var(--blue);
}
.nav-link[aria-current='page'] {
  background: linear-gradient(transparent 50%, var(--marker) 50%, var(--marker) 84%, transparent 84%);
}

/* ---------- ヒーロー ---------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 560px);
  gap: 48px;
  align-items: center;
  padding: 64px 0 56px;
}
.eyebrow {
  margin: 0 0 18px;
  color: var(--blue);
  font-weight: 700;
  font-size: 17px;
}
.hero-title {
  margin: 0;
  font-size: clamp(56px, 7vw, 88px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: 0.02em;
}
.hero-lead {
  margin: 22px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-soft);
  line-height: 2;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 26px;
  border: var(--line);
  border-radius: 10px;
  font-weight: 700;
  font-size: 16px;
  text-decoration: none;
  transition: background-color 0.15s ease, transform 0.15s ease;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn-primary {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}
.btn-primary:hover {
  background: var(--blue-deep);
  border-color: var(--blue-deep);
}
.btn-ghost {
  background: var(--card);
  color: var(--ink);
}
.btn-ghost:hover {
  background: var(--marker);
}

/* fig.1 理解度の推移 */
.fig {
  margin: 0;
  padding: 22px 24px 18px;
  background: var(--card);
  border: var(--line);
  border-radius: var(--radius-hand);
  box-shadow: 0 16px 32px rgba(26, 26, 26, 0.14), 0 2px 0 rgba(26, 26, 26, 0.05);
  transform: rotate(1.5deg);
}
.fig-caption {
  margin-bottom: 6px;
  font-weight: 700;
  font-size: 16px;
}
.fig-svg {
  display: block;
  width: 100%;
  height: auto;
}
.fig-axis {
  fill: none;
  stroke: var(--ink);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.fig-axis-label {
  fill: var(--muted);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
}
.fig-axis-y {
  writing-mode: vertical-rl;
}
.fig-curve {
  fill: none;
  stroke: var(--blue);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.fig-pt text {
  fill: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
}
.dot {
  stroke: var(--ink);
  stroke-width: 2.5;
}
.dot-peak {
  fill: var(--marker);
}
.dot-valley {
  fill: var(--card);
}
.dot-goal {
  fill: var(--orange);
}
@media (prefers-reduced-motion: no-preference) {
  /* 初回表示で曲線が左から描かれる */
  .fig-curve {
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
    animation: draw-curve 1.6s cubic-bezier(0.4, 0, 0.2, 1) 0.4s forwards;
  }
  .fig-pt {
    opacity: 0;
    animation: pop-in 0.4s ease-out forwards;
  }
  .fig-pt-1 {
    animation-delay: 0.85s;
  }
  .fig-pt-2 {
    animation-delay: 1.35s;
  }
  .fig-pt-3 {
    animation-delay: 1.95s;
  }
  @keyframes draw-curve {
    to {
      stroke-dashoffset: 0;
    }
  }
  @keyframes pop-in {
    from {
      opacity: 0;
      transform: translateY(4px);
    }
    to {
      opacity: 1;
      transform: none;
    }
  }
}

/* ---------- セクション共通 ---------- */
.section {
  padding: 56px 0 8px;
}
.page {
  padding-top: 48px;
}
.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 24px;
}
.section-title {
  margin: 0;
  font-size: 34px;
  font-weight: 900;
  line-height: 1.3;
}
.section-en {
  color: var(--muted);
  font-size: 16px;
  font-weight: 500;
}
.more {
  margin: 24px 0 0;
  text-align: right;
  font-weight: 700;
}
.more a {
  text-decoration: none;
}
.more a:hover {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}
.empty {
  color: var(--muted);
}

/* 活動の目的 */
.purpose-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 30px;
}
.purpose {
  padding: 30px 30px 32px;
}
.purpose-no {
  margin: 0 0 6px;
  color: var(--blue);
  font-size: 24px;
  font-weight: 700;
}
.purpose-title {
  margin: 0 0 10px;
  font-size: 22px;
  font-weight: 900;
}
.purpose-body {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-soft);
}

/* つくったもの（ポラロイド風カード） */
.works-grid {
  list-style: none;
  margin: 0;
  padding: 14px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 30px;
}
.work {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 20px 20px 22px;
  background: var(--card);
  border: var(--line);
  border-radius: var(--radius-hand);
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
/* 傾きは固定（ランダムにしない） */
.works-grid > li:nth-child(3n + 1) > .work {
  transform: rotate(-0.8deg);
}
.works-grid > li:nth-child(3n + 2) > .work {
  transform: rotate(0.6deg);
}
.works-grid > li:nth-child(3n) > .work {
  transform: rotate(-0.5deg);
}
.works-grid > li:hover > .work {
  transform: rotate(0deg) translateY(-3px);
  box-shadow: 0 14px 26px rgba(26, 26, 26, 0.12);
}
/* マスキングテープ */
.tape {
  position: absolute;
  top: -14px;
  left: 50%;
  width: 96px;
  height: 28px;
  transform: translateX(-50%) rotate(-2deg);
  background: rgba(255, 227, 110, 0.85);
  border-radius: 2px;
  box-shadow: 0 1px 2px rgba(26, 26, 26, 0.1);
}
.work-thumb {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 2 / 1;
  border-radius: 8px;
  background: var(--thumb-game);
  color: var(--ink);
  overflow: hidden;
}
.work[data-category='TOOL'] .work-thumb {
  background: var(--thumb-tool);
}
.work[data-category='WIP'] .work-thumb {
  background: var(--thumb-wip);
}
.work-thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.work-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
}
.work-cat {
  color: var(--blue);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.04em;
}
.work-no {
  color: var(--muted);
  font-size: 13px;
}
.work-title {
  margin: 8px 0 0;
  font-size: 20px;
  font-weight: 900;
  line-height: 1.5;
}
.work-desc {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
}
.work-url {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--muted);
  overflow-wrap: anywhere;
}
.work-link {
  align-self: flex-start;
  margin-top: auto;
  padding-top: 18px;
  color: var(--blue);
  font-weight: 700;
  font-size: 16px;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}
.work-link:hover {
  color: var(--blue-deep);
}
.work-link.is-disabled {
  color: var(--muted);
  text-decoration: none;
}

/* カテゴリ絞り込み */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 8px;
}
.chip {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 18px;
  border: var(--line);
  border-radius: 999px;
  background: var(--card);
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
}
.chip:hover {
  background: var(--marker);
}
.chip[aria-current='true'] {
  background: var(--ink);
  color: var(--bg);
}

/* 実験ノート（一覧） */
.note-list {
  list-style: none;
  margin: 0;
  padding: 8px 32px;
  background: var(--card);
  border: var(--line);
  border-radius: var(--radius-hand);
}
.note-item + .note-item {
  border-top: 2px dashed var(--dash);
}
.note-row {
  display: grid;
  grid-template-columns: 64px 128px minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
  color: var(--ink);
  text-decoration: none;
}
.note-row:hover .note-title {
  color: var(--blue);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}
.note-no {
  color: var(--blue);
  font-weight: 700;
  font-size: 18px;
}
.note-date {
  color: var(--muted);
  font-size: 14px;
}
.note-title {
  font-weight: 700;
  font-size: 17px;
}
.note-status {
  font-size: 14px;
  font-weight: 700;
  text-align: right;
  white-space: nowrap;
}

/* 理解度ステータス（バッジ） */
.status {
  display: inline-block;
  padding: 2px 14px;
  border: var(--line);
  border-radius: 999px;
  background: var(--card);
  color: var(--ink);
  font-weight: 700;
  font-size: 14px;
  line-height: 1.7;
}
.status[data-status='understood'] {
  background: var(--marker);
}
.status[data-status='chotto'] {
  background: var(--orange);
}
.status[data-status='tbc'] {
  border-style: dashed;
  color: var(--muted);
}

/* 実験ノート（詳細） */
.breadcrumb {
  margin: 0 0 20px;
  font-weight: 700;
}
.breadcrumb a {
  text-decoration: none;
}
.breadcrumb a:hover {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}
.note-head {
  margin-bottom: 28px;
}
.note-meta {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin: 0 0 8px;
}
.note-heading {
  margin: 0;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 900;
  line-height: 1.5;
}
.note-status-line {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 16px 0 0;
  color: var(--muted);
  font-weight: 700;
  font-size: 14px;
}
.prose {
  padding: 32px 36px;
  font-size: 16px;
  line-height: 2;
  color: var(--ink-soft);
}
.prose > :first-child {
  margin-top: 0;
}
.prose > :last-child {
  margin-bottom: 0;
}
.prose h2 {
  margin: 36px 0 12px;
  padding-bottom: 6px;
  border-bottom: 2px dashed var(--dash);
  color: var(--ink);
  font-size: 22px;
  font-weight: 900;
}
.prose h3 {
  margin: 28px 0 8px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 900;
}
.prose p,
.prose ul,
.prose ol {
  margin: 12px 0;
}
.prose ul,
.prose ol {
  padding-left: 1.6em;
}
.prose strong {
  color: var(--ink);
  background: linear-gradient(transparent 55%, var(--marker) 55%);
}
.prose code {
  padding: 0.1em 0.4em;
  border-radius: 4px;
  background: rgba(26, 26, 26, 0.06);
  font-family: var(--font-mono);
  font-size: 0.9em;
}
.prose pre {
  margin: 16px 0;
  padding: 18px 20px;
  border-radius: 10px;
  background: var(--ink);
  color: var(--bg);
  font-size: 14px;
  line-height: 1.7;
  overflow-x: auto;
}
.prose pre code {
  padding: 0;
  background: none;
  color: inherit;
  font-size: inherit;
}
.prose blockquote {
  margin: 16px 0;
  padding: 4px 18px;
  border-left: 4px solid var(--marker);
  color: var(--muted);
}
.prose img {
  height: auto;
  border: var(--line);
  border-radius: 8px;
}
.prose table {
  border-collapse: collapse;
}
.prose th,
.prose td {
  padding: 6px 12px;
  border: 1px solid var(--dash);
}
.related {
  margin-top: 48px;
}
.related-title {
  margin: 0 0 4px;
  font-size: 22px;
  font-weight: 900;
}

/* メンバー */
.members-grid {
  list-style: none;
  margin: 0;
  padding: 8px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 30px;
}
.member {
  padding: 28px 28px 30px;
}
.member-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border: var(--line);
  border-radius: 50%;
  background: var(--thumb-tool);
  color: var(--blue);
  font-size: 30px;
  font-weight: 900;
  overflow: hidden;
}
.member-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.member-name {
  margin: 16px 0 6px;
  font-size: 20px;
  font-weight: 900;
}
.member-comment {
  margin: 0;
  font-size: 15px;
  color: var(--ink-soft);
}
.member-works-label {
  margin: 18px 0 4px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.member-works {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
}
.member-works a {
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}
.member-works a:hover {
  color: var(--blue);
}
.member-works .mono {
  margin-right: 8px;
  color: var(--muted);
  font-size: 12px;
}
.member-none {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

/* 404 */
.notfound {
  min-height: 50vh;
  padding-top: 64px;
}
.notfound .hero-title {
  font-size: clamp(44px, 6vw, 72px);
}
.notfound .btn {
  margin-top: 28px;
}

/* ---------- フッター ---------- */
.site-footer {
  margin-top: 72px;
  border-top: var(--line);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding: 20px 0 28px;
  color: var(--muted);
  font-size: 13px;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-links a {
  font-weight: 700;
}

/* ---------- レスポンシブ（仕様 §6.4） ---------- */
@media (max-width: 1023px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
    padding: 40px 0 48px;
  }
  .fig {
    max-width: 560px;
  }
  .purpose-grid,
  .works-grid,
  .members-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  :root {
    --gutter: 16px;
  }
  .site-header {
    padding-top: 16px;
  }
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  .brand {
    font-size: 20px;
  }
  .nav {
    width: calc(100% + 8px);
    margin-left: -8px;
    gap: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .nav-link {
    padding: 0 8px;
    font-size: 14px;
  }
  .hero {
    gap: 36px;
    padding: 28px 0 40px;
  }
  .hero-title {
    font-size: clamp(48px, 15vw, 64px);
  }
  .hero-lead {
    font-size: 15px;
  }
  .hero-actions .btn {
    flex: 1 1 auto;
  }
  .fig {
    padding: 16px 14px 12px;
  }
  .section {
    padding-top: 44px;
  }
  .section-title {
    font-size: 28px;
  }
  .purpose-grid,
  .works-grid,
  .members-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }
  .purpose {
    padding: 24px 22px 26px;
  }
  .note-list {
    padding: 4px 18px;
  }
  .note-row {
    grid-template-columns: auto auto minmax(0, 1fr);
    gap: 4px 14px;
    padding: 16px 0;
  }
  .note-no {
    grid-row: 1;
    grid-column: 1;
  }
  .note-date {
    grid-row: 1;
    grid-column: 2;
  }
  .note-status {
    grid-row: 1;
    grid-column: 3;
    font-size: 13px;
  }
  .note-title {
    grid-row: 2;
    grid-column: 1 / -1;
    font-size: 16px;
  }
  .prose {
    padding: 22px 18px;
    font-size: 15px;
  }
  .site-footer {
    margin-top: 48px;
  }
}