/* =========================================================================
   saku — デザイントークンは webdesign-catalog の top-19（page-lime-a）を採用
   color-lime-volt / typo-lime-tight / layout-lime-impact
   ========================================================================= */

:root {
  /* color-lime-volt */
  --c-text: #101010;
  --c-text-sub: #5c6152;
  --c-accent: #d2ff00;
  --c-bg: #f4f4ed;
  --c-bg-section: #d2ff00;
  --c-bg-card: #101010;
  --c-text-card: #f4f4ed;
  --c-border: #101010;

  /* typo-lime-tight */
  --font-base: "Helvetica Neue", "Hiragino Sans", "Noto Sans JP", Inter, Arial, system-ui, sans-serif;
  --font-display: "Helvetica Neue", "Hiragino Sans", "Noto Sans JP", Inter, Arial, system-ui, sans-serif;
  --font-mono: "Roboto Mono", "SF Mono", Menlo, monospace;
  --fs-display: 132px;
  --fs-h1: 96px;
  --fs-h2: 56px;
  --fs-h3: 32px;
  --fs-h4: 22px;
  --fs-lead: 22px;
  --fs-body: 16px;
  --fs-small: 14px;
  --fs-label: 12px;
  --fw-heading: 700;
  --fw-body: 400;
  --lh-heading: 0.88;
  --lh-body: 1.7;
  --ls-heading: -0.025em;
  --measure: 720px;

  /* layout-lime-impact */
  --container: 1440px;
  --sec-pad-y: 120px;
  --sec-pad-x: 32px;
  --gap: 24px;
  --stack-gap: 56px;
  --radius: 0px;
  --radius-lg: 500px;
  --border-w: 2px;

  /* 読み物のための調整（和文長文用。top-19 のアクセシビリティ注記に従う） */
  --lh-heading-ja: 1.24;
  --lh-read: 1.95;
}

@media (max-width: 767px) {
  :root {
    --fs-display: 46px;
    --fs-h1: 40px;
    --fs-h2: 30px;
    --fs-h3: 22px;
    --fs-lead: 17px;
    --sec-pad-y: 64px;
    --sec-pad-x: 20px;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-base);
  font-size: var(--fs-body);
  font-weight: var(--fw-body);
  line-height: var(--lh-body);
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--fw-heading);
  line-height: var(--lh-heading-ja);
  letter-spacing: -0.01em;
  margin: 0;
}
p { margin: 0; }
ul, ol { margin: 0; padding: 0 0 0 1.35em; }

.container { max-width: var(--container); margin: 0 auto; padding-inline: var(--sec-pad-x); }
.section { padding-block: var(--sec-pad-y); }
.section--flush { padding-block: 0; }
.section--dark { background: var(--c-bg-card); color: var(--c-text-card); }
.section--lime { background: var(--c-bg-section); color: var(--c-text); }

.label {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-text-sub);
}
.section--dark .label { color: var(--c-accent); }
.section--lime .label { color: var(--c-text); }

.chip {
  display: inline-block;
  border: 1px solid currentColor;
  border-radius: var(--radius-lg);
  padding: 4px 14px;
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  line-height: 1.6;
  text-decoration: none;
  background: transparent;
}
.chip--fill { background: var(--c-accent); border-color: var(--c-text); color: var(--c-text); }

/* ---------------------------------------------------------------- header */
.site-header {
  border-bottom: var(--border-w) solid var(--c-border);
  background: var(--c-bg);
  position: sticky;
  top: 0;
  z-index: 20;
}
.site-header__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px var(--sec-pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-logo {
  font-family: var(--font-display);
  font-weight: var(--fw-heading);
  font-size: 24px;
  letter-spacing: -0.02em;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.site-logo::after {
  content: "";
  width: 10px;
  height: 10px;
  background: var(--c-accent);
  border: var(--border-w) solid var(--c-border);
  border-radius: 50%;
}
.site-header__brand { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
.site-copy { font-size: var(--fs-small); color: var(--c-text-sub); letter-spacing: 0.02em; }
.site-nav { display: flex; gap: 18px; font-size: var(--fs-small); flex-wrap: wrap; }
.site-nav a { text-decoration: none; border-bottom: var(--border-w) solid transparent; padding-bottom: 2px; }
.site-nav a:hover, .site-nav a.is-active { border-bottom-color: var(--c-text); }

/* ------------------------------------------------------------------ hero */
.hero { background: var(--c-bg-section); border-bottom: var(--border-w) solid var(--c-border); }
.hero__inner { max-width: var(--container); margin: 0 auto; padding: clamp(56px, 8vw, 120px) var(--sec-pad-x); }
.hero__title {
  font-size: var(--fs-display);
  line-height: 1.02;
  letter-spacing: var(--ls-heading);
  margin: 0 0 32px;
}
.hero__title span { display: block; }
.hero__title .is-invert {
  background: var(--c-bg-card);
  color: var(--c-text-card);
  display: inline-block;
  padding: 0 0.12em;
}
.hero__lead { font-size: var(--fs-lead); max-width: var(--measure); line-height: 1.85; }
.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  margin-top: 40px;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.12em;
}

/* --------------------------------------------------------------- marquee */
.marquee {
  background: var(--c-bg-card);
  color: var(--c-accent);
  border-bottom: var(--border-w) solid var(--c-border);
  overflow: hidden;
  padding-block: 18px;
}
.marquee__track {
  display: flex;
  gap: 48px;
  width: max-content;
  animation: marquee 32s linear infinite;
  font-family: var(--font-display);
  font-weight: var(--fw-heading);
  font-size: clamp(22px, 3.4vw, 40px);
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.marquee__track a { color: inherit; text-decoration: none; }
.marquee__track a:hover { text-decoration: underline; text-underline-offset: 6px; }
.marquee__track a::after { content: "／"; margin-left: 48px; opacity: 0.5; }
.marquee:hover .marquee__track { animation-play-state: paused; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) {
  .marquee__track { animation: none; }
}

/* ------------------------------------------------------------ 見出しブロック */
.head { display: grid; grid-template-columns: 1fr; gap: 12px; margin-bottom: var(--stack-gap); }
.head__title { font-size: var(--fs-h2); letter-spacing: -0.015em; }
.head__note { max-width: var(--measure); line-height: var(--lh-read); }

/* ------------------------------------------------------------- テーマ一覧 */
.themes { display: flex; flex-wrap: wrap; gap: 12px; }
.themes a {
  text-decoration: none;
  border: var(--border-w) solid var(--c-border);
  padding: 10px 18px;
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  background: transparent;
  transition: background 0.15s ease;
}
.themes a:hover, .themes a[aria-pressed="true"] { background: var(--c-accent); }
.themes .count { font-family: var(--font-mono); font-size: var(--fs-label); }

/* ------------------------------------------------------- 研究ノート（段差） */
.notes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 56px 40px; align-items: start; }
.note-card {
  border-top: var(--border-w) solid var(--c-border);
  padding-top: 20px;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.note-card__num { display: none; }
.note-card__kind { align-self: flex-start; }
.note-card__title { font-size: var(--fs-h3); letter-spacing: -0.015em; }
.note-card:hover .note-card__title { text-decoration: underline; text-underline-offset: 4px; }
.note-card__q { color: var(--c-text-sub); font-size: var(--fs-small); line-height: 1.8; }
.note-card__meta { font-family: var(--font-mono); font-size: var(--fs-label); color: var(--c-text-sub); margin-top: auto; padding-top: 8px; }

/* ------------------------------------------------------------- 読み方説明 */
.howto { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap); }
.howto__item { border-top: var(--border-w) solid var(--c-accent); padding-top: 18px; display: grid; gap: 10px; }
.howto__name { font-size: var(--fs-h4); font-weight: var(--fw-heading); }
.howto__desc { font-size: var(--fs-small); line-height: 1.9; color: #c9cdc2; }

/* -------------------------------------------------------------- 数字 */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap); }
.stat__num { font-size: clamp(56px, 9vw, 120px); font-weight: var(--fw-heading); line-height: 0.92; letter-spacing: -0.03em; }
.stat__unit { font-size: var(--fs-h4); margin-left: 6px; }
.stat__label { font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: 0.14em; margin-top: 10px; }

/* ------------------------------------------------------------- 記事ページ */
.article-hero { background: var(--c-bg-section); border-bottom: var(--border-w) solid var(--c-border); }
.article-hero__inner { max-width: var(--container); margin: 0 auto; padding: clamp(40px, 6vw, 88px) var(--sec-pad-x); }
.article-hero__kicker { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.article-hero__title { font-size: clamp(30px, 5.2vw, 64px); line-height: 1.18; letter-spacing: -0.02em; max-width: 22ch; }
.article-hero__q {
  margin-top: 32px;
  border-top: var(--border-w) solid var(--c-text);
  padding-top: 18px;
  max-width: var(--measure);
}
.article-hero__q .label { color: var(--c-text); }
.article-hero__q p { font-size: var(--fs-lead); font-weight: var(--fw-heading); line-height: 1.6; margin-top: 8px; }

.article-body { max-width: var(--container); margin: 0 auto; padding: var(--sec-pad-y) var(--sec-pad-x); display: grid; grid-template-columns: 240px minmax(0, var(--measure)); gap: 72px; justify-content: center; }
.toc { position: sticky; top: 96px; align-self: start; font-size: var(--fs-small); }
.toc ol { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 10px; }
.toc a { text-decoration: none; color: var(--c-text-sub); display: flex; gap: 10px; line-height: 1.5; }
.toc a:hover { color: var(--c-text); }

.summary { border: var(--border-w) solid var(--c-border); padding: 24px; margin-bottom: 64px; display: grid; gap: 14px; }
.summary p { line-height: var(--lh-read); }
.summary dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 20px; margin: 0; font-size: var(--fs-small); }
.summary dt { font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: 0.1em; color: var(--c-text-sub); }
.summary dd { margin: 0; }

.sec { margin-bottom: 72px; scroll-margin-top: 90px; }
.sec__head { display: flex; align-items: baseline; gap: 0; border-bottom: var(--border-w) solid var(--c-border); padding-bottom: 12px; margin-bottom: 28px; flex-wrap: wrap; }
.sec__num { font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: 0.16em; }
.sec__title { font-size: var(--fs-h3); letter-spacing: -0.015em; }
.sec__label { margin-left: auto; font-family: var(--font-mono); font-size: var(--fs-label); color: var(--c-text-sub); letter-spacing: 0.1em; }
.sec > * + * { margin-top: 1.5em; }
.sec p, .sec li { line-height: var(--lh-read); }
.sec h3 { font-size: var(--fs-h4); margin-top: 2.2em; }
.sec ul, .sec ol { display: grid; gap: 0.7em; }
.sec a { text-underline-offset: 3px; }

/* 事実 / 解釈 / 未解決 の描き分け */
.note-block { padding: 20px 22px; display: grid; gap: 10px; }
.note-block__label { font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: 0.14em; display: inline-flex; align-items: center; gap: 8px; }
.note-block__label::before { content: ""; width: 10px; height: 10px; border: var(--border-w) solid var(--c-text); background: var(--c-accent); }
.note-block p { line-height: var(--lh-read); }
.note-block--inference { border-left: 8px solid var(--c-accent); background: #ffffff8c; box-shadow: inset 0 0 0 var(--border-w) var(--c-border); }
.note-block--fact { border-left: 8px solid var(--c-text); background: #ffffff8c; }
blockquote.quote { border-left: var(--border-w) solid var(--c-text-sub); margin: 0; padding-left: 20px; color: var(--c-text-sub); }

.affiliate-note { border: var(--border-w) solid var(--c-border); background: var(--c-accent); padding: 16px 20px; font-size: var(--fs-small); line-height: 1.8; }

.sources { counter-reset: src; display: grid; gap: 14px; list-style: none; padding: 0; }
.sources li { display: grid; grid-template-columns: 34px 1fr; gap: 12px; font-size: var(--fs-small); line-height: 1.8; word-break: break-word; }
.sources li::before { counter-increment: src; content: counter(src, decimal-leading-zero); font-family: var(--font-mono); font-size: var(--fs-label); color: var(--c-accent); padding-top: 4px; }

.related { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap); }

/* ---------------------------------------------------------------- footer */
.site-footer { background: var(--c-bg-section); border-top: var(--border-w) solid var(--c-border); }
.site-footer__inner { max-width: var(--container); margin: 0 auto; padding: 56px var(--sec-pad-x) 40px; display: flex; flex-wrap: wrap; gap: 24px; justify-content: space-between; align-items: flex-end; }
.site-footer__logo { font-family: var(--font-display); font-weight: var(--fw-heading); font-size: clamp(48px, 12vw, 120px); line-height: 0.82; letter-spacing: -0.04em; margin: 0; }
.site-footer__meta { font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: 0.12em; text-align: right; display: grid; gap: 6px; }
.site-footer__link { color: inherit; text-decoration: none; border-bottom: 1px solid currentColor; padding-bottom: 1px; justify-self: end; }
.site-footer__link:hover { opacity: 0.7; }

/* ------------------------------------------------------------------- SP */
@media (max-width: 1023px) {
  .notes, .howto, .stats, .related { grid-template-columns: 1fr; }
  .article-body { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .toc { position: static; border: var(--border-w) solid var(--c-border); padding: 18px; }
  .note-card { border-top-width: var(--border-w); }
}
.nav-toggle { display: none; background: none; border: var(--border-w) solid var(--c-border); padding: 9px 8px; cursor: pointer; border-radius: 0; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--c-text); margin: 4px 0; transition: transform 0.2s ease, opacity 0.2s ease; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 767px) {
  .site-copy { display: none; }
  .nav-toggle { display: block; }
  .site-nav { display: none; }
  .site-nav.is-open {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--c-bg);
    border-bottom: var(--border-w) solid var(--c-border);
    z-index: 30;
  }
  .site-nav.is-open a {
    padding: 14px var(--sec-pad-x);
    border-top: 1px solid var(--c-border);
    border-bottom: none;
    font-size: var(--fs-small);
  }
  .site-header { position: sticky; }
  .site-header__inner { position: relative; }
  .site-nav { gap: 14px; font-size: var(--fs-label); }
  .hero__title { letter-spacing: -0.02em; }
  .sec__label { margin-left: 0; width: 100%; }
}

#filter-state a { color: var(--c-text); }
.sec__label { white-space: nowrap; }

.ref { font-size: 0.8em; text-decoration: none; padding: 0 1px; border-bottom: 1px solid var(--c-text-sub); vertical-align: 0.15em; }
.ref:hover { background: var(--c-accent); border-bottom-color: var(--c-text); }

/* ---------------------------------------------------- 下書きプレビュー（localhost限定） */
.draft-banner {
  background: repeating-linear-gradient(-45deg, var(--c-accent), var(--c-accent) 14px, #eaff66 14px, #eaff66 28px);
  border-bottom: var(--border-w) solid var(--c-border);
  padding: 12px var(--sec-pad-x);
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  font-weight: 700;
  text-align: center;
}
.note-card--draft { opacity: 0.92; border-top-style: dashed; }


/* ------------------------------------------------------------ 関連商品カード */
.product { display: flex; align-items: center; justify-content: space-between; gap: 20px; border: var(--border-w) solid var(--c-border); padding: 18px 22px; margin-bottom: 14px; flex-wrap: wrap; }
.product__label { line-height: var(--lh-read); flex: 1 1 240px; }
.product__cta { flex: 0 0 auto; display: inline-block; background: var(--c-accent); color: var(--c-text); text-decoration: none; border: var(--border-w) solid var(--c-border); padding: 12px 26px; font-weight: 700; letter-spacing: 0.04em; transition: background 0.15s ease, color 0.15s ease; }
.product__cta:hover { background: var(--c-text); color: var(--c-accent); }

/* 長いURL・リンクの見切れ対策 */
.sec a, .sources a { overflow-wrap: anywhere; }

/* 表（一覧ノート・レポートの基本情報など）。横に長い表は枠内で横スクロールさせ、ページ全体は横スクロールさせない */
.table-wrap { overflow-x: auto; margin: 8px 0 24px; border: var(--border-w) solid var(--c-border); -webkit-overflow-scrolling: touch; }
.table-wrap table { border-collapse: collapse; width: 100%; min-width: 560px; font-size: var(--fs-small); line-height: 1.6; }
.table-wrap th, .table-wrap td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--c-border); }
.table-wrap th { font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: 0.1em; background: var(--c-accent); border-bottom: var(--border-w) solid var(--c-border); white-space: nowrap; }
.table-wrap tbody tr:last-child td { border-bottom: 0; }