/*
 * 夜のほけんしつ Design System
 * Mobile-first / CSS only / no external dependencies
 */

:root {
  color-scheme: dark;

  /* Confirmed character palette */
  --color-navy: #24324a; /* 正式ロゴ等のブランド原色。UIの濃色文字には使わない。 */
  --color-lavender: #b9a3cf;
  --color-off-white: #f8f5f2;
  --color-peach: #f3cdb8;
  --color-gray: #aaa7b2; /* 罫線・スクロールバー用。本文とメタ文字は --color-text-muted に統一。 */
  --color-dark-gray: #34343e;

  /* Navy-derived night surfaces */
  --color-bg: #141c2a; /* 最背面の夜空だけに残し、ヘッダーやカード面とは役割を分ける。 */
  --color-bg-elevated: #192438;
  --color-surface: #202d43; /* 記事内の入れ子面用。トップのカテゴリ面には使わない。 */
  --color-surface-strong: #2a3a56;

  /* Accessible text and state colors derived from the confirmed palette */
  --color-text: var(--color-off-white);
  --color-text-muted: #c9c5cd;
  --color-link: #d8c8e6;
  --color-link-hover: #eadff3;
  --color-on-accent: var(--color-bg-elevated);
  --color-focus: var(--color-peach);
  --color-border: rgb(170 167 178 / 36%);
  --color-border-strong: rgb(185 163 207 / 58%);
  --color-lavender-soft: rgb(185 163 207 / 12%);
  --color-lavender-medium: rgb(185 163 207 / 24%);
  --color-peach-soft: rgb(243 205 184 / 12%);
  --color-peach-medium: rgb(243 205 184 / 24%);
  --color-off-white-soft: rgb(248 245 242 / 8%);
  --color-nav-overlay: var(--color-bg-elevated);
  --color-shadow: rgb(10 14 22 / 34%);
  --color-bg-glow: rgb(185 163 207 / 8%);
  --color-transparent: transparent;

  /* System font stack: fast and dependable for Japanese text */
  --font-sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;
  --font-serif: "Yu Mincho", YuMincho, "Hiragino Mincho ProN", serif;

  /* Type scale */
  --text-2xs: 0.75rem;
  --text-xs: 0.8125rem;
  --text-sm: 0.9375rem;
  --text-base: 1.0625rem;
  --text-md: 1.125rem;
  --text-lg: 1.25rem;
  --text-xl: clamp(1.25rem, 4.8vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 5.5vw, 1.875rem);
  --text-3xl: clamp(1.875rem, 7vw, 2.625rem);
  --text-display: clamp(2.5rem, 12vw, 5rem);

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --radius-sm: 0.5rem;
  --radius-md: 0.875rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.75rem;
  --radius-pill: 999px;

  --content-width: 42rem;
  --site-width: 72rem;
  --tap-size: 2.75rem;
  --line-body: 1.9;
  --line-heading: 1.45;
  --transition-fast: 160ms ease;
}

/* Reset and base */

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

html {
  min-width: 20rem;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  min-width: 20rem;
  min-height: 100vh;
  margin: 0;
  color: var(--color-text);
  background:
    radial-gradient(circle at 50% 0, var(--color-bg-glow), var(--color-transparent) 34rem),
    var(--color-bg);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--line-body);
  overflow-wrap: anywhere;
}

img,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

button,
input,
select,
textarea {
  font: inherit;
}

a {
  color: var(--color-link);
  text-decoration-color: var(--color-border-strong);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration-color: currentColor;
}

:focus-visible {
  outline: 0.125rem solid var(--color-off-white);
  outline-offset: 0.125rem;
  box-shadow: 0 0 0 0.25rem var(--color-navy);
}

::selection {
  color: var(--color-on-accent);
  background: var(--color-lavender);
}

[hidden] {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: var(--space-3);
  left: var(--space-3);
  min-height: var(--tap-size);
  padding: var(--space-2) var(--space-4);
  color: var(--color-on-accent);
  background: var(--color-peach);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 700;
  transform: translateY(-200%);
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  color: var(--color-on-accent);
  transform: translateY(0);
}

.site-shell {
  width: min(calc(100% - (var(--space-5) * 2)), var(--site-width));
  margin-inline: auto;
}

/* Shared header and navigation */

.site-header {
  position: relative;
  z-index: 10;
  background: var(--color-nav-overlay);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(0.75rem);
}

.site-header__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-block: var(--space-4) var(--space-3);
}

.site-logo {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  gap: var(--space-3);
  min-height: var(--tap-size);
  color: var(--color-text);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.site-logo:hover {
  color: var(--color-text);
}

.site-logo__mark {
  position: relative;
  flex: 0 0 auto;
  width: 2.25rem;
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--color-lavender-soft);
  border: 1px solid var(--color-border-strong);
  border-radius: 50%;
}

.site-logo__mark::before {
  position: absolute;
  inset: 0.4rem;
  content: "";
  background: var(--color-lavender);
  border-radius: 50%;
}

.site-logo__mark::after {
  position: absolute;
  top: 0.2rem;
  left: 0.85rem;
  width: 1.2rem;
  aspect-ratio: 1;
  content: "";
  background: var(--color-bg-elevated);
  border-radius: 50%;
}

.site-nav {
  width: 100%;
  max-width: 100%;
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  width: 100%;
  gap: var(--space-2);
  padding: var(--space-1) 0;
  margin: 0;
  list-style: none;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap-size);
  padding-inline: var(--space-4);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.03em;
  text-decoration: none;
  white-space: nowrap;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-on-accent);
  background: var(--color-lavender);
  border-color: var(--color-lavender);
}

.site-main {
  min-height: 58vh;
  padding-block: var(--space-10) var(--space-20);
}

/* Footer */

.site-footer {
  color: var(--color-text-muted);
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
}

.site-footer__inner {
  display: grid;
  gap: var(--space-8);
  padding-block: var(--space-12) var(--space-8);
}

.site-footer__message {
  max-width: 34rem;
  margin: 0;
  font-size: var(--text-sm);
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer__nav a {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap-size);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.site-footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-block: var(--space-5);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
}

.site-footer__bottom p {
  margin: 0;
}

/* Page headings and shared sections */

.page-header {
  width: min(100%, var(--content-width));
  margin: 0 auto var(--space-12);
}

.eyebrow {
  margin: 0 0 var(--space-3);
  color: var(--color-lavender);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-title,
.section-title {
  margin: 0;
  font-weight: 700;
  line-height: var(--line-heading);
  letter-spacing: 0.015em;
}

.page-title {
  font-size: var(--text-3xl);
}

.section-title {
  font-size: var(--text-2xl);
}

.section-lead {
  max-width: 40rem;
  margin: var(--space-4) 0 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.section-block {
  margin-top: var(--space-16);
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.section-heading h2 {
  margin: 0;
  font-size: var(--text-2xl);
  line-height: var(--line-heading);
}

/* Article page */

.article {
  width: min(100%, var(--content-width));
  margin-inline: auto;
}

.article-header {
  padding-bottom: var(--space-8);
  margin-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

.category-label {
  margin: 0 0 var(--space-4);
}

.category-label a,
.category-label span {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding-inline: var(--space-3);
  color: var(--color-on-accent);
  background: var(--color-lavender);
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.article-title {
  margin: 0;
  font-size: var(--text-3xl);
  line-height: var(--line-heading);
  letter-spacing: 0.015em;
}

.article-meta,
.meta {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  padding: 0;
  margin: var(--space-5) 0 0;
  list-style: none;
}

.article-meta li {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
}

.article-meta__label {
  color: var(--color-text-muted);
  font-weight: 700;
}

.article-body {
  font-size: var(--text-base);
  line-height: var(--line-body);
}

.article-body > :first-child {
  margin-top: 0;
}

.article-body > :last-child {
  margin-bottom: 0;
}

.article-body p {
  margin: 0 0 1.65em;
}

.article-body h2,
.article-body h3 {
  scroll-margin-top: var(--space-6);
  line-height: var(--line-heading);
  text-wrap: pretty;
}

.article-body h2 {
  padding-left: var(--space-4);
  margin: var(--space-16) 0 var(--space-6);
  border-left: 0.25rem solid var(--color-lavender);
  font-size: var(--text-2xl);
}

.article-body h3 {
  margin: var(--space-10) 0 var(--space-4);
  color: var(--color-peach);
  font-size: var(--text-xl);
}

.article-body h4 {
  margin: var(--space-8) 0 var(--space-3);
  color: var(--color-lavender);
  font-size: var(--text-lg);
  line-height: var(--line-heading);
}

.article-body strong {
  color: var(--color-off-white);
  font-weight: 750;
}

.article-body ul,
.article-body ol {
  padding-left: 1.4em;
  margin: 0 0 var(--space-8);
}

.article-body li + li {
  margin-top: var(--space-2);
}

.article-body blockquote {
  padding: var(--space-5) var(--space-6);
  margin: var(--space-8) 0;
  color: var(--color-text-muted);
  background: var(--color-off-white-soft);
  border-left: 0.1875rem solid var(--color-gray);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.article-body blockquote > :last-child {
  margin-bottom: 0;
}

.article-body hr {
  height: 1px;
  margin: var(--space-12) 0;
  background: var(--color-border);
  border: 0;
}

.article-after {
  display: grid;
  gap: var(--space-10);
  margin-top: var(--space-16);
}

.article-after:empty {
  display: none;
}

/* Editorial boxes */

.box-point,
.box-caution,
.senpai-voice {
  position: relative;
  padding: var(--space-6);
  margin: var(--space-8) 0;
  border-radius: var(--radius-lg);
}

.box-point {
  background: var(--color-lavender-soft);
  border: 1px solid var(--color-border-strong);
  box-shadow: inset 0.25rem 0 0 var(--color-lavender);
}

.box-caution {
  background: var(--color-peach-soft);
  border: 1px solid var(--color-peach-medium);
  box-shadow: inset 0.25rem 0 0 var(--color-peach);
}

.box-label {
  display: table;
  padding: var(--space-1) var(--space-3);
  margin: 0 0 var(--space-4);
  color: var(--color-on-accent);
  background: var(--color-lavender);
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 800;
  letter-spacing: 0.05em;
}

.box-caution .box-label {
  background: var(--color-peach);
}

.box-point > :last-child,
.box-caution > :last-child,
.senpai-voice > :last-child {
  margin-bottom: 0;
}

.senpai-voice {
  padding: var(--space-6) var(--space-5) var(--space-6) 5.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  box-shadow: 0 var(--space-2) var(--space-8) var(--color-shadow);
}

.senpai-voice::before {
  position: absolute;
  top: var(--space-6);
  left: var(--space-5);
  width: 3.25rem;
  aspect-ratio: 1;
  content: "";
  background: var(--color-lavender-soft);
  border: 1px solid var(--color-border-strong);
  border-radius: 50%;
}

.senpai-voice::after {
  position: absolute;
  top: 2.15rem;
  left: 2.25rem;
  width: 1.5rem;
  aspect-ratio: 1;
  content: "";
  background: var(--color-lavender);
  border-radius: 50%;
  box-shadow: 0.55rem -0.2rem 0 var(--color-surface);
}

.senpai-voice .box-label {
  color: var(--color-lavender);
  background: var(--color-transparent);
  border-radius: 0;
  padding: 0;
  letter-spacing: 0.04em;
}

/* Q&A */

.qa-list {
  display: grid;
  gap: var(--space-5);
  margin: var(--space-8) 0;
}

.qa-item {
  overflow: hidden;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.qa-q,
.qa-a {
  position: relative;
  min-height: 4rem;
  padding: var(--space-5) var(--space-5) var(--space-5) 4rem;
  margin: 0;
}

.qa-q {
  color: var(--color-text);
  background: var(--color-lavender-soft);
  font-weight: 700;
}

.qa-a {
  color: var(--color-text-muted);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.qa-q::before,
.qa-a::before {
  position: absolute;
  top: var(--space-5);
  left: var(--space-5);
  display: grid;
  place-items: center;
  width: 2rem;
  aspect-ratio: 1;
  border-radius: 50%;
  font-size: var(--text-sm);
  font-weight: 800;
  line-height: 1;
}

.qa-q::before {
  content: "Q";
  color: var(--color-on-accent);
  background: var(--color-lavender);
}

.qa-a::before {
  content: "A";
  color: var(--color-on-accent);
  background: var(--color-peach);
}

.qa-q > :first-child,
.qa-a > :first-child {
  margin-top: 0;
}

.qa-q > :last-child,
.qa-a > :last-child {
  margin-bottom: 0;
}

/* Checklist */

.checklist {
  display: grid;
  gap: var(--space-3);
  padding: 0;
  margin: var(--space-8) 0;
  list-style: none;
}

.checklist li {
  position: relative;
  min-height: 2.75rem;
  padding: var(--space-3) var(--space-4) var(--space-3) 3.25rem;
  background: var(--color-off-white-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.checklist li::before {
  position: absolute;
  top: 0.8rem;
  left: var(--space-4);
  display: grid;
  place-items: center;
  width: 1.5rem;
  aspect-ratio: 1;
  content: "✓";
  color: var(--color-on-accent);
  background: var(--color-lavender);
  border-radius: 50%;
  font-size: var(--text-xs);
  font-weight: 900;
  line-height: 1;
}

/* Comparison table */

.compare-table-wrap {
  max-width: 100%;
  margin: var(--space-8) 0;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 var(--space-2) var(--space-8) var(--color-shadow);
  scrollbar-color: var(--color-gray) var(--color-bg-elevated);
}

.compare-table {
  width: 100%;
  min-width: 36rem;
  border-collapse: collapse;
  background: var(--color-bg-elevated);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.compare-table caption {
  padding: var(--space-4) var(--space-5);
  color: var(--color-text);
  background: var(--color-surface);
  font-weight: 700;
  text-align: left;
}

.compare-table th,
.compare-table td {
  padding: var(--space-4) var(--space-5);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.compare-table th:last-child,
.compare-table td:last-child {
  border-right: 0;
}

.compare-table tr:last-child th,
.compare-table tr:last-child td {
  border-bottom: 0;
}

.compare-table thead th {
  color: var(--color-on-accent);
  background: var(--color-lavender);
  font-weight: 800;
}

.compare-table tbody th {
  color: var(--color-peach);
  background: var(--color-off-white-soft);
  font-weight: 700;
}

/* CTA and disclosure */

.cta-block {
  padding: var(--space-6);
  background: var(--color-peach-soft);
  border: 1px solid var(--color-peach-medium);
  border-radius: var(--radius-xl);
  text-align: center;
}

.cta-block__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-xl);
  line-height: var(--line-heading);
}

.cta-block__text {
  margin: 0 0 var(--space-5);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: min(100%, 32rem);
  min-height: 3.5rem;
  padding: var(--space-3) var(--space-6);
  color: var(--color-on-accent);
  background: var(--color-peach);
  border: 1px solid var(--color-peach);
  border-radius: var(--radius-pill);
  box-shadow: 0 var(--space-2) var(--space-6) var(--color-shadow);
  font-size: var(--text-base);
  font-weight: 800;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

.cta-btn:hover {
  color: var(--color-on-accent);
  background: var(--color-off-white);
  border-color: var(--color-off-white);
  box-shadow: 0 var(--space-3) var(--space-8) var(--color-shadow);
  transform: translateY(-0.125rem);
}

.pr-badge {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  margin: var(--space-6) 0 0;
  color: var(--color-peach);
  background: var(--color-peach-soft);
  border: 1px solid var(--color-peach-medium);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: 700;
  line-height: 1.65;
}

.pr-badge::before {
  flex: 0 0 auto;
  padding: 0 var(--space-2);
  content: "PR";
  color: var(--color-on-accent);
  background: var(--color-peach);
  border-radius: var(--radius-sm);
  font-size: var(--text-2xs);
  font-weight: 900;
  letter-spacing: 0.06em;
}

/* Author card */

.author-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-4);
  padding: var(--space-6);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.author-card__mark {
  display: grid;
  place-items: center;
  width: 3.5rem;
  aspect-ratio: 1;
  color: var(--color-on-accent);
  background: var(--color-lavender);
  border-radius: 50%;
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1;
}

.author-card__label {
  margin: 0 0 var(--space-1);
  color: var(--color-lavender);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.author-card__name {
  margin: 0;
  font-size: var(--text-lg);
  line-height: var(--line-heading);
}

.author-card__bio {
  margin: var(--space-2) 0 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* Article and category cards */

.article-list,
.related-list {
  display: grid;
  gap: var(--space-4);
  padding: 0;
  margin: 0;
  list-style: none;
}

.related-card {
  position: relative;
  display: grid;
  gap: var(--space-2);
  min-width: 0;
  padding: var(--space-5) var(--space-12) var(--space-5) var(--space-5);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.related-card::after {
  position: absolute;
  top: 50%;
  right: var(--space-5);
  content: "→";
  color: var(--color-lavender);
  font-size: var(--text-lg);
  transform: translateY(-50%);
}

.related-card:hover {
  background: var(--color-surface);
  border-color: var(--color-border-strong);
  transform: translateY(-0.125rem);
}

.related-card a {
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.65;
  text-decoration: none;
  text-wrap: pretty;
}

.related-card a::before {
  position: absolute;
  inset: 0;
  content: "";
  border-radius: inherit;
}

.related-card .meta {
  display: block;
}

.category-grid {
  display: grid;
  gap: var(--space-4);
}

.category-grid > p,
.category-card {
  --category-accent: var(--color-lavender);

  position: relative;
  min-width: 0;
  padding: 0;
  margin: 0;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-inline-start: 0.25rem solid var(--category-accent);
  border-radius: var(--radius-lg);
}

.category-grid > :nth-child(even) {
  --category-accent: var(--color-peach);
}

.category-grid > p a,
.category-card a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 5rem;
  padding: var(--space-5);
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.5;
  text-decoration: none;
  overflow-wrap: normal;
  word-break: normal;
  word-break: auto-phrase;
}

.category-grid > p a::after,
.category-card a::after {
  flex: 0 0 auto;
  content: "→";
  color: var(--category-accent);
}

.category-grid > p:hover,
.category-card:hover {
  border-color: var(--color-border-strong);
}

/* Home */

.home-hero {
  position: relative;
  isolation: isolate;
  min-height: 26rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: end;
  overflow: hidden;
  padding: var(--space-8) var(--space-6) 0;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.home-hero::before {
  position: absolute;
  z-index: 0;
  top: -4.5rem;
  right: -4.5rem;
  width: 14rem;
  aspect-ratio: 1;
  content: "";
  background:
    radial-gradient(circle at 68% 34%, var(--color-bg-elevated) 0 46%, transparent 47%),
    var(--color-lavender-medium);
  border: 1px solid var(--color-border-strong);
  border-radius: 50%;
}

.home-hero::after {
  content: none;
}

.home-hero__content {
  position: relative;
  z-index: 1;
  min-width: 0;
  max-width: 40rem;
}

.home-hero__eyebrow {
  margin: 0 0 var(--space-4);
  color: var(--color-lavender);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.13em;
}

.home-hero h1 {
  margin: 0;
  font-size: clamp(2.75rem, 9vw, 5rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0.04em;
  text-wrap: balance;
}

.home-hero__hook,
.home-hero__copy {
  max-width: 34rem;
  overflow-wrap: normal;
  word-break: normal;
  word-break: auto-phrase;
}

.home-hero__hook {
  margin: var(--space-6) 0 0;
  color: var(--color-text);
  font-size: var(--text-base);
  font-weight: 700;
  line-height: 1.75;
}

.home-hero__copy {
  margin: var(--space-2) 0 0;
  color: var(--color-text-muted);
  font-size: var(--text-base);
  line-height: 1.75;
}

.home-hero__visual {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  width: min(100%, 14rem);
  height: 12rem;
  overflow: hidden;
  margin: var(--space-2) auto 0;
}

.home-hero__luna {
  width: 100%;
  height: 100%;
  max-height: none;
  object-fit: cover;
  object-position: center top;
  filter: drop-shadow(0 var(--space-2) var(--space-4) var(--color-shadow));
  pointer-events: none;
  user-select: none;
}

.first-guide {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-6);
  margin-top: var(--space-8);
  background: var(--color-lavender-soft);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
}

.first-guide p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.first-guide a {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  min-height: var(--tap-size);
  padding: var(--space-2) var(--space-5);
  color: var(--color-on-accent);
  background: var(--color-lavender);
  border: 1px solid var(--color-lavender);
  border-radius: var(--radius-pill);
  font-weight: 800;
  text-decoration: none;
}

.first-guide a:hover {
  color: var(--color-on-accent);
  background: var(--color-off-white);
  border-color: var(--color-off-white);
}

.x-follow {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-3) var(--space-4);
  padding: var(--space-5);
  margin-top: var(--space-12);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
}

.x-follow__avatar {
  width: 3.5rem;
  aspect-ratio: 1;
  object-fit: cover;
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-lavender);
  border-radius: 50%;
}

.x-follow__body {
  min-width: 0;
}

.x-follow__title {
  margin: 0;
  color: var(--color-text);
  font-size: var(--text-base);
  line-height: var(--line-heading);
  overflow-wrap: normal;
  word-break: normal;
  word-break: auto-phrase;
}

.x-follow__text {
  margin: var(--space-1) 0 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.7;
  overflow-wrap: normal;
  word-break: normal;
  word-break: auto-phrase;
}

.x-follow__button {
  display: inline-flex;
  grid-column: 1 / -1;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: var(--tap-size);
  padding: var(--space-2) var(--space-5);
  color: var(--color-on-accent);
  background: var(--color-lavender);
  border: 1px solid var(--color-lavender);
  border-radius: var(--radius-pill);
  font-size: var(--text-base);
  font-weight: 800;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.x-follow__button:hover {
  color: var(--color-on-accent);
  background: var(--color-off-white);
  border-color: var(--color-off-white);
  transform: translateY(-0.125rem);
}

/* List page */

.list-page {
  width: min(100%, 58rem);
  margin-inline: auto;
}

.list-page .article-list {
  margin-top: var(--space-8);
}

/* Standalone component preview */

.component-demo {
  width: min(calc(100% - (var(--space-5) * 2)), var(--site-width));
  margin-inline: auto;
}

.component-demo__intro {
  width: min(100%, var(--content-width));
  padding-block: var(--space-12) var(--space-6);
}

.component-demo__intro h1 {
  margin: 0;
  font-size: var(--text-3xl);
  line-height: var(--line-heading);
}

.component-demo__intro p {
  color: var(--color-text-muted);
}

.component-section {
  padding-block: var(--space-12);
  border-top: 1px solid var(--color-border);
}

.component-section__header {
  width: min(100%, var(--content-width));
  margin: 0 auto var(--space-6);
}

.component-section__header h2 {
  margin: 0;
  font-size: var(--text-2xl);
  line-height: var(--line-heading);
}

.component-section__header p {
  margin: var(--space-2) 0 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.component-preview {
  width: min(100%, var(--content-width));
  margin-inline: auto;
}

.token-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.token-swatch {
  overflow: hidden;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.token-swatch__color {
  min-height: 5rem;
}

.token-swatch__label {
  padding: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  line-height: 1.5;
}

.token-swatch__label strong {
  display: block;
  color: var(--color-text);
}

.token-swatch--navy .token-swatch__color { background: var(--color-navy); }
.token-swatch--lavender .token-swatch__color { background: var(--color-lavender); }
.token-swatch--off-white .token-swatch__color { background: var(--color-off-white); }
.token-swatch--peach .token-swatch__color { background: var(--color-peach); }
.token-swatch--gray .token-swatch__color { background: var(--color-gray); }
.token-swatch--dark-gray .token-swatch__color { background: var(--color-dark-gray); }

.demo-stack {
  display: grid;
  gap: var(--space-5);
}

.diagram-gallery {
  display: grid;
  width: min(100%, var(--content-width));
  gap: var(--space-12);
  margin-inline: auto;
}

.diagram-figure {
  margin: 0;
}

.diagram-image {
  width: 100%;
  height: auto;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.diagram-caption {
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.75;
}

.diagram-caption strong {
  display: block;
  margin-bottom: var(--space-1);
  color: var(--color-text);
  font-size: var(--text-base);
}

/* Wider screens */

@media (min-width: 40rem) {
  .site-shell,
  .component-demo {
    width: min(calc(100% - (var(--space-10) * 2)), var(--site-width));
  }

  .site-header__inner {
    padding-block: var(--space-4);
  }

  .site-footer__bottom {
    flex-direction: row;
    justify-content: space-between;
  }

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

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

  .token-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 48rem) {
  .home-hero {
    grid-template-columns: minmax(0, 1.5fr) minmax(12rem, 0.5fr);
    align-items: stretch;
    min-height: 30rem;
    padding: var(--space-12) var(--space-10) 0;
  }

  .home-hero::before {
    top: -4rem;
    right: 2rem;
    width: 17rem;
  }

  .home-hero__content {
    align-self: center;
    padding-bottom: var(--space-12);
  }

  .home-hero__visual {
    align-self: end;
    width: min(100%, 18rem);
    height: auto;
    margin: 0 auto;
  }

  .home-hero__luna {
    height: auto;
    max-height: 27rem;
    object-fit: contain;
    object-position: center bottom;
    transform: translateY(4.5%);
  }

  .x-follow {
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: var(--space-5);
    padding: var(--space-6);
  }

  .x-follow__avatar {
    width: 4rem;
  }

  .x-follow__button {
    grid-column: auto;
    width: auto;
    white-space: nowrap;
  }
}

@media (min-width: 52rem) {
  :root {
    --text-base: 1.125rem;
    --line-body: 1.85;
  }

  .site-header__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-8);
  }

  .site-nav {
    flex: 1 1 auto;
  }

  .site-nav__list {
    justify-content: flex-end;
  }

  .site-footer__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: start;
  }

  .site-footer__nav {
    justify-content: flex-end;
  }

  .home-hero {
    min-height: 32rem;
    padding: var(--space-16) var(--space-16) 0;
  }

  .home-hero__content {
    padding-bottom: var(--space-16);
  }

  .home-hero__visual {
    width: min(100%, 20rem);
  }

  .home-hero__luna {
    max-height: 30rem;
  }

  .first-guide {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .category-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* Very small screens */

@media (max-width: 23rem) {
  :root {
    --text-base: 1rem;
  }

  .senpai-voice {
    padding: 5.5rem var(--space-5) var(--space-5);
  }

  .senpai-voice::before {
    top: var(--space-5);
  }

  .senpai-voice::after {
    top: 1.9rem;
  }

  .author-card {
    grid-template-columns: 1fr;
  }
}

/* Motion and contrast preferences */

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media (forced-colors: active) {
  .site-logo__mark,
  .box-point,
  .box-caution,
  .senpai-voice,
  .qa-item,
  .checklist li,
  .related-card,
  .author-card,
  .home-hero,
  .x-follow,
  .diagram-image {
    border: 1px solid currentColor;
  }
}

/* 正式ロゴ(月+ハート)導入: 旧CSS描画の月を無効化して画像マークに置換 */
.site-logo__mark--img {
  background: none;
  border: none;
  border-radius: 0;
  overflow: visible;
}
.site-logo__mark--img::before,
.site-logo__mark--img::after {
  content: none;
}
.site-logo { white-space: nowrap; }

/* ルナ先生アバター実装: CSS円をキャラ画像に置換 (build.py v2連携) */
.senpai-voice::before {
  background: url("/assets/character/luna-avatar-normal.png") center/cover no-repeat;
  border: none;
}
.senpai-voice::after { content: none; }
.senpai-voice--worry::before { background-image: url("/assets/character/luna-avatar-worry.png"); }
.senpai-voice--serious::before { background-image: url("/assets/character/luna-avatar-serious.png"); }
.senpai-voice--cheer::before { background-image: url("/assets/character/luna-avatar-cheer.png"); }
/* 図解 */
.diagram { margin: var(--space-8) 0; }
.diagram img { max-width: 100%; height: auto; border-radius: var(--radius-lg); }

/* 記事末の終端記号（ブランドマーク）: 読み終わりの合図。固定ページには出さない */
.article:not(.article--page) .article-body::after {
  display: block;
  width: 1.75rem;
  height: 1.75rem;
  margin: 3.5rem auto 1rem;
  content: "";
  background: url("/assets/logo/mark.svg") center / contain no-repeat;
  opacity: 0.45;
}

/* 著者マークを業態シンボルに（顔は作らない方針。人物の識別は名前が担う） */
.author-card__mark--trade {
  display: grid;
  place-items: center;
  color: var(--color-navy, #24324A);
}
.author-card__mark--trade .author-card__icon {
  width: 58%;
  height: 58%;
}

/* 一覧カードの業態バッジ（どんな現場の先輩の話かを開く前に伝える） */
.card-trade {
  display: inline-flex;
  gap: 0.35em;
  align-items: center;
  margin-right: 0.9em;
  color: var(--color-lavender, #B9A3CF);
}
.card-trade svg { width: 1.3em; height: 1.3em; }
.card-date { white-space: nowrap; }

/* ── スマホのメニュー: checkbox方式でJSゼロの開閉。PCでは常時展開 ── */
.site-nav__checkbox {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.site-nav__toggle {
  display: inline-flex;
  gap: 0.55em;
  align-items: center;
  padding: 0.5rem 0.95rem;
  color: var(--color-text, #F8F5F2);
  font-size: 0.875rem;
  font-weight: 700;
  border: 1px solid var(--color-border-strong, #2c3a52);
  border-radius: 999px;
  cursor: pointer;
}
.site-nav__checkbox:focus-visible + .site-nav__toggle {
  outline: 2px solid var(--color-lavender, #B9A3CF);
  outline-offset: 2px;
}
.site-nav__bars,
.site-nav__bars::before,
.site-nav__bars::after {
  display: block;
  width: 1.05rem;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}
.site-nav__bars { position: relative; }
.site-nav__bars::before,
.site-nav__bars::after {
  position: absolute;
  left: 0;
  content: "";
}
.site-nav__bars::before { top: -6px; }
.site-nav__bars::after { top: 6px; }
/* 開いているときは×印に */
.site-nav__checkbox:checked + .site-nav__toggle .site-nav__bars { background: transparent; }
.site-nav__checkbox:checked + .site-nav__toggle .site-nav__bars::before { top: 0; transform: rotate(45deg); }
.site-nav__checkbox:checked + .site-nav__toggle .site-nav__bars::after { top: 0; transform: rotate(-45deg); }
/* スマホは既定で閉じ、チェックで開く */
.site-nav > .site-nav__list { display: none; }
.site-nav__checkbox:checked ~ .site-nav__list {
  display: flex;
  margin-top: var(--space-4, 0.75rem);
}

@media (min-width: 768px) {
  .site-nav__toggle { display: none; }
  .site-nav > .site-nav__list { display: flex; margin-top: 0; }
}
/* スマホでもロゴとメニューボタンを1行に収める（縦を節約） */
.site-header__inner {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4, 0.75rem);
  flex-wrap: wrap;
}
.site-nav {
  display: flex;
  flex: 0 0 auto;
  flex-wrap: wrap;
  justify-content: flex-end;
  width: auto;
}
.site-nav__checkbox:checked ~ .site-nav__list { flex-basis: 100%; width: 100%; }
@media (min-width: 768px) {
  .site-header__inner { flex-wrap: nowrap; }
  .site-nav { flex: 1 1 auto; width: auto; }
}
/* 開いたメニューはボタン直下にドロップダウンで出す（ボタンの位置を動かさない） */
.site-nav { position: relative; }
.site-nav__checkbox:checked ~ .site-nav__list {
  position: absolute;
  top: calc(100% + 0.6rem);
  right: 0;
  z-index: 50;
  flex-direction: column;
  flex-wrap: nowrap;
  width: max-content;
  min-width: 12rem;
  margin-top: 0;
  padding: 0.6rem;
  background: var(--color-surface, #192438);
  border: 1px solid var(--color-border-strong, #2c3a52);
  border-radius: var(--radius-lg, 16px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.38);
}
.site-nav__checkbox:checked ~ .site-nav__list a { width: 100%; }

@media (min-width: 768px) {
  .site-nav__checkbox:checked ~ .site-nav__list,
  .site-nav > .site-nav__list {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    width: 100%;
    min-width: 0;
    padding: var(--space-1) 0;
    background: none;
    border: none;
    box-shadow: none;
  }
}

/* トップのカテゴリ別ブロック */
.cat-block { margin-block: var(--space-8, 2rem); }
.cat-block__title { margin-bottom: var(--space-3, 0.5rem); font-size: 1.125rem; }
.cat-block__title a { color: var(--color-text, #F8F5F2); text-decoration: none; }
.cat-block__more { margin-top: var(--space-3, 0.5rem); font-size: 0.9rem; }
.cat-block__more a { color: var(--color-lavender, #B9A3CF); }
/* フッターのロゴタイプ */
.site-footer__logo { margin: var(--space-10, 2.5rem) 0 var(--space-6, 1.5rem); text-align: center; }
.site-footer__logo img { display: block; width: min(280px, 62%); height: auto; margin-inline: auto; opacity: 0.9; }

/* ── 日本語の折り返しを文節単位に（カタカナ語の途中改行を防ぐ） ──
   対応ブラウザ（Chromium系・Safari 17.4+）で有効。未対応環境は従来動作 */
.article-body p,
.article-body li,
.article-body h2,
.article-body h3,
.box-point p,
.box-caution p,
.senpai-voice p,
.home-hero__eyebrow,
.section-block > header p,
.cat-block__title,
.related-card a,
.author-card__name,
.author-card__bio,
.card-trade,
.card-trade span,
.article-meta li,
.article-meta span,
.site-footer__message,
.first-guide p,
.x-follow p {
  overflow-wrap: normal;
  word-break: normal;
  word-break: auto-phrase;
}