/* =========================================================
 * LUCRIS AI Lab - main.css
 * Phase A: 基本スタイル（リセット、共通要素、ヘッダー、フッター）
 * ========================================================= */

/* ---------- CSS Variables ---------- */
:root {
  /* Color */
  --color-bg: #0A0A0B;
  --color-bg-sub: #141415;
  --color-bg-elevated: #1A1A1C;
  --color-text: #EAEAEA;
  --color-text-sub: #9B9B9B;
  --color-text-muted: #6A6A6C;
  --color-accent-1: #D97757;
  --color-accent-1-hover: #E89A7E;
  --color-accent-2: #7DA98C;
  --color-accent-2-hover: #95C0A4;
  --color-border: #2A2A2C;
  --color-error: #E07B7B;
  --color-link: var(--color-accent-1);
  --color-link-hover: var(--color-accent-1-hover);
  --color-success: var(--color-accent-2);

  /* Typography */
  --font-heading: 'Inter', 'Noto Sans JP', system-ui, sans-serif;
  --font-body: 'Noto Sans JP', system-ui, sans-serif;
  --font-code: 'JetBrains Mono', monospace;

  /* Layout */
  --container-max: 1200px;
  --content-max: 760px;
  --sidebar-width: 320px;
  --header-height: 64px;

  /* Spacing */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;

  /* Transition */
  --transition-fast: 0.15s ease;
  --transition: 0.2s ease;
  --transition-slow: 0.3s ease;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

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

html {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

h1 { font-size: clamp(1.75rem, 1.4rem + 1.5vw, 2.5rem); }
h2 { font-size: clamp(1.4rem, 1.2rem + 1vw, 1.875rem); }
h3 { font-size: clamp(1.2rem, 1.1rem + 0.5vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p { margin: 0 0 var(--space-sm); }

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover, a:focus-visible { color: var(--color-link-hover); }
a:focus-visible {
  outline: 2px solid var(--color-accent-1);
  outline-offset: 2px;
  border-radius: 2px;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  background: none;
  border: 0;
  color: inherit;
  padding: 0;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

code, pre, kbd, samp {
  font-family: var(--font-code);
  font-size: 0.92em;
}

blockquote {
  margin: var(--space-md) 0;
  padding: var(--space-sm) var(--space-md);
  border-left: 4px solid var(--color-accent-1);
  background: var(--color-bg-elevated);
  color: var(--color-text-sub);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

hr {
  margin: var(--space-lg) 0;
  border: 0;
  border-top: 1px solid var(--color-border);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
}
th, td {
  padding: var(--space-xs) var(--space-sm);
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}
th { font-weight: 600; color: var(--color-text); }

::selection {
  background: var(--color-accent-1);
  color: var(--color-bg);
}

/* ---------- Accessibility ---------- */
.screen-reader-text {
  position: absolute !important;
  clip: rect(1px, 1px, 1px, 1px);
  width: 1px;
  height: 1px;
  overflow: hidden;
  word-wrap: normal !important;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--color-accent-1);
  color: var(--color-bg);
  padding: var(--space-xs) var(--space-sm);
  z-index: 9999;
  border-radius: 0 0 var(--radius-md) 0;
  font-weight: 600;
}
.skip-link:focus { top: 0; color: var(--color-bg); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-sm);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--space-md); }
}

.container--narrow { max-width: var(--content-max); }

.container--with-sidebar {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
  padding-block: var(--space-lg);
}

@media (min-width: 1024px) {
  .container--with-sidebar {
    grid-template-columns: 1fr var(--sidebar-width);
    gap: var(--space-xl);
  }
}

.site-main {
  min-height: calc(100vh - var(--header-height) - 240px);
  padding-top: var(--header-height);
}

/* ---------- Buttons ---------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition-fast);
  white-space: nowrap;
}
.button:hover { transform: translateY(-1px); }
.button:active { transform: translateY(0); }

.button--primary {
  background: var(--color-accent-1);
  color: #1a0a04;
}
.button--primary:hover, .button--primary:focus-visible {
  background: var(--color-accent-1-hover);
  color: #1a0a04;
}

.button--secondary {
  background: var(--color-accent-2);
  color: #0a1a0e;
}
.button--secondary:hover, .button--secondary:focus-visible {
  background: var(--color-accent-2-hover);
  color: #0a1a0e;
}

.button--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.button--outline:hover, .button--outline:focus-visible {
  border-color: var(--color-accent-1);
  color: var(--color-accent-1);
}

.button--ghost {
  background: transparent;
  color: var(--color-text-sub);
}
.button--ghost:hover, .button--ghost:focus-visible {
  color: var(--color-text);
  background: var(--color-bg-elevated);
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(10, 10, 11, 0.85);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  height: 100%;
}

.site-header__brand { flex: 0 0 auto; }

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.site-header__logo:hover, .site-header__logo:focus-visible { color: var(--color-accent-1); }

.site-header__logo-mark {
  color: var(--color-accent-1);
  font-size: 1.1em;
  line-height: 1;
}

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

.site-header__menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--space-md);
  justify-content: center;
}
.site-header__menu li { margin: 0; }
.site-header__menu a {
  display: block;
  padding: var(--space-xs) 0;
  color: var(--color-text-sub);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}
.site-header__menu a:hover,
.site-header__menu a:focus-visible,
.site-header__menu .current-menu-item > a {
  color: var(--color-text);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex: 0 0 auto;
}

.site-header__search-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-sub);
  transition: background var(--transition), color var(--transition);
}
.site-header__search-toggle:hover, .site-header__search-toggle:focus-visible {
  background: var(--color-bg-elevated);
  color: var(--color-text);
}

.site-header__progress-link {
  font-size: 0.88rem;
  padding: 0.5rem 0.85rem;
}

.site-header__menu-toggle { display: none; }

.site-header__search {
  background: var(--color-bg-sub);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) 0;
}
.site-header__search[hidden] { display: none; }

/* Hamburger */
.hamburger {
  width: 22px;
  height: 16px;
  position: relative;
  display: inline-block;
}
.hamburger span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition), top var(--transition);
}
.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 7px; }
.hamburger span:nth-child(3) { top: 14px; }

.site-header__menu-toggle[aria-expanded="true"] .hamburger span:nth-child(1) {
  top: 7px;
  transform: rotate(45deg);
}
.site-header__menu-toggle[aria-expanded="true"] .hamburger span:nth-child(2) {
  opacity: 0;
}
.site-header__menu-toggle[aria-expanded="true"] .hamburger span:nth-child(3) {
  top: 7px;
  transform: rotate(-45deg);
}

@media (max-width: 1023px) {
  .site-header__menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    color: var(--color-text-sub);
  }

  .site-header__menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: var(--space-sm);
    background: var(--color-bg-sub);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
  }
  .site-header__menu a {
    padding: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
  }
  .site-header__menu a:last-child { border-bottom: 0; }

  .site-header__nav.is-open .site-header__menu { display: flex; }

  .site-header__progress-link { display: none; }
}

/* ---------- Search form ---------- */
.search-form {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition);
}
.search-form:focus-within {
  border-color: var(--color-accent-1);
}
.search-form__input {
  flex: 1;
  background: transparent;
  border: 0;
  padding: 0.6rem 0.85rem;
  color: var(--color-text);
  outline: 0;
}
.search-form__input::placeholder { color: var(--color-text-muted); }
.search-form__submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-text-sub);
}
.search-form__submit:hover { color: var(--color-accent-1); }

/* ---------- Footer ---------- */
.site-footer {
  margin-top: var(--space-2xl);
  background: var(--color-bg-sub);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-xl) var(--space-md);
  color: var(--color-text-sub);
  font-size: 0.92rem;
}

.site-footer__columns {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .site-footer__columns {
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-xl);
  }
}

.site-footer__title {
  margin: 0 0 var(--space-xs);
  font-size: 1.05rem;
  color: var(--color-text);
}
.site-footer__heading {
  margin: 0 0 var(--space-sm);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-sub);
  font-weight: 600;
}
.site-footer__description {
  margin: 0 0 var(--space-sm);
  line-height: 1.7;
}
.site-footer__operator { margin: 0; font-size: 0.85rem; }
.site-footer__operator a { color: var(--color-text-sub); }
.site-footer__operator a:hover { color: var(--color-accent-1); }

.site-footer__menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.site-footer__menu a { color: var(--color-text-sub); }
.site-footer__menu a:hover, .site-footer__menu a:focus-visible {
  color: var(--color-accent-1);
}

.site-footer__bottom {
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  text-align: center;
}
.site-footer__copyright {
  margin: 0;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* ---------- Page header ---------- */
.page-header {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}
.page-header__title {
  margin: 0 0 var(--space-xs);
}
.page-header__description {
  color: var(--color-text-sub);
  margin: 0;
}

/* ---------- Post list / cards ---------- */
.post-list {
  display: grid;
  gap: var(--space-md);
}

@media (min-width: 768px) {
  .post-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

.post-card {
  background: var(--color-bg-sub);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), border-color var(--transition);
}
.post-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent-1);
}
.post-card__thumb { display: block; aspect-ratio: 16 / 9; overflow: hidden; }
.post-card__thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform var(--transition-slow);
}
.post-card:hover .post-card__thumb img { transform: scale(1.04); }

.post-card__body {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  flex: 1;
}
.post-card__title { margin: 0; font-size: 1.15rem; line-height: 1.4; }
.post-card__title a { color: var(--color-text); }
.post-card__title a:hover { color: var(--color-accent-1); }

.post-card__meta {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.post-card__excerpt {
  font-size: 0.92rem;
  color: var(--color-text-sub);
  flex: 1;
}
.post-card__excerpt p { margin: 0; }

.post-card__link {
  margin-top: var(--space-xs);
  font-size: 0.88rem;
  font-weight: 600;
  align-self: flex-start;
}

/* ---------- Pagination ---------- */
.pagination {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2xs);
  margin-top: var(--space-lg);
}
.pagination .page-numbers {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-xs);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  color: var(--color-text-sub);
  font-size: 0.9rem;
}
.pagination .page-numbers:hover,
.pagination .page-numbers:focus-visible {
  border-color: var(--color-accent-1);
  color: var(--color-accent-1);
}
.pagination .page-numbers.current {
  background: var(--color-accent-1);
  color: #1a0a04;
  border-color: var(--color-accent-1);
}

/* ---------- Sidebar (basic) ---------- */
.sidebar { display: flex; flex-direction: column; gap: var(--space-md); }
.sidebar .widget {
  background: var(--color-bg-sub);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
}
.sidebar .widget-title {
  margin: 0 0 var(--space-sm);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-sub);
}
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li { padding: var(--space-2xs) 0; }

/* ---------- No posts ---------- */
.no-posts {
  text-align: center;
  padding: var(--space-xl) var(--space-sm);
}
.no-posts h1 { margin-bottom: var(--space-sm); }
.no-posts p { color: var(--color-text-sub); margin-bottom: var(--space-md); }
.no-posts .search-form { max-width: 480px; margin: 0 auto; }

/* =========================================================
   タグ・トピック・レベルチップ
   ========================================================= */
.post-meta-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xs);
  margin: var(--space-sm) 0 0;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  color: var(--color-text-sub);
  text-decoration: none;
  transition: all var(--transition-fast);
}
.chip:hover, .chip:focus-visible {
  border-color: var(--color-accent-1);
  color: var(--color-text);
}
.chip--small { font-size: 0.72rem; padding: 0.18rem 0.55rem; }
.chip--topic { color: var(--color-accent-1); border-color: rgba(217, 119, 87, 0.3); }
.chip--topic:hover { background: rgba(217, 119, 87, 0.1); border-color: var(--color-accent-1); color: var(--color-accent-1-hover); }
.chip--tag { color: var(--color-text-sub); }
.chip--level { font-weight: 600; }
.chip__dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}
.chip--level-beginner { color: var(--color-accent-1); border-color: rgba(217, 119, 87, 0.4); }
.chip--level-intermediate { color: var(--color-accent-2); border-color: rgba(125, 169, 140, 0.4); }
.chip--level-advanced { color: #6496DC; border-color: rgba(100, 150, 220, 0.4); }

/* メタアイテム（時計アイコン+所要時間など、シングルページ上部） */
.single-lesson__meta,
.single-course__metaline,
.single-article__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: center;
  margin-top: var(--space-xs);
  color: var(--color-text-sub);
  font-size: 0.88rem;
}
.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
}
.meta-item--level { font-weight: 600; }
.meta-item--level-beginner { color: var(--color-accent-1); }
.meta-item--level-intermediate { color: var(--color-accent-2); }
.meta-item--level-advanced { color: #6496DC; }
.dot-mark {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}
.dot { opacity: 0.4; padding: 0 0.2em; }

/* =========================================================
   パンくず
   ========================================================= */
.breadcrumbs {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4em;
  align-items: center;
}
.breadcrumbs a {
  color: var(--color-text-sub);
}
.breadcrumbs a:hover { color: var(--color-accent-1); }
.breadcrumbs__current { color: var(--color-text-muted); }
.breadcrumbs span[aria-hidden="true"] { color: var(--color-text-muted); }

/* =========================================================
   シングル記事（共通：blog/ainews/lesson/course）
   ========================================================= */
.single-article,
.single-lesson,
.single-course {
  padding: var(--space-lg) 0 var(--space-2xl);
}

.single-article__header,
.single-lesson__header,
.single-course__header {
  padding-top: var(--space-md);
}

.single-article__eyebrow,
.single-lesson__progress-line,
.single-course__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent-1);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
}

.single-article__eyebrow--news {
  color: var(--color-error);
}

.single-article__title,
.single-lesson__title,
.single-course__title {
  font-size: clamp(1.75rem, 1.4rem + 1.8vw, 2.6rem);
  line-height: 1.25;
  margin-bottom: var(--space-sm);
}

.single-article__lede {
  font-size: 1.1rem;
  color: var(--color-text-sub);
  line-height: 1.7;
  margin: 0 0 var(--space-sm);
}

.single-article__hero,
.single-lesson__hero,
.single-course__hero {
  margin: var(--space-md) auto var(--space-lg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  /* アイキャッチを小さめに（デカすぎ対策） */
  max-width: 560px;
  width: 100%;
  padding-inline: var(--space-sm);
  background: transparent;
  border: 0;
}
.single-article__hero img,
.single-lesson__hero img,
.single-course__hero img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}

/* コース詳細のhero（containerクラス付き）の中身も同様の制約 */
.single-course__hero.container { max-width: 560px; padding-inline: var(--space-sm); }
.single-course__hero.container img {
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}

/* 本文 */
.single-article__body,
.single-lesson__body,
.single-course__body {
  font-size: 1.02rem;
  line-height: 1.9;
}
.single-article__body h2,
.single-lesson__body h2,
.single-course__body h2 {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}
.single-article__body h3,
.single-lesson__body h3,
.single-course__body h3 {
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}
.single-article__body ul,
.single-article__body ol,
.single-lesson__body ul,
.single-lesson__body ol,
.single-course__body ul,
.single-course__body ol {
  margin: var(--space-sm) 0;
  padding-left: 1.5em;
}
.single-article__body li,
.single-lesson__body li,
.single-course__body li {
  margin-bottom: 0.4em;
}
.single-article__body strong,
.single-lesson__body strong,
.single-course__body strong {
  color: var(--color-text);
  font-weight: 600;
}
.single-article__body em,
.single-lesson__body em,
.single-course__body em {
  color: var(--color-text-sub);
  font-style: normal;
  background: var(--color-bg-elevated);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}
.single-article__body code,
.single-lesson__body code,
.single-course__body code {
  background: var(--color-bg-elevated);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.92em;
  color: var(--color-accent-1);
}
.single-article__body pre,
.single-lesson__body pre,
.single-course__body pre {
  background: var(--color-bg-sub);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  overflow-x: auto;
  margin: var(--space-md) 0;
  line-height: 1.6;
}
.single-article__body pre code,
.single-lesson__body pre code,
.single-course__body pre code {
  background: none;
  padding: 0;
  color: var(--color-text);
  font-size: 0.88rem;
}

.single-article__footer,
.single-lesson__footer {
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

/* =========================================================
   レッスン専用UI（番号バナー、進捗、コース内ナビ）
   ========================================================= */
.single-lesson__course-link {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--color-text-sub);
  margin-bottom: var(--space-xs);
}
.single-lesson__course-link:hover { color: var(--color-accent-1); }

.single-lesson__progress-line {
  display: flex;
  gap: 0.4em;
  align-items: baseline;
}
.single-lesson__lesson-num { color: var(--color-accent-1); }
.single-lesson__total { color: var(--color-text-muted); font-weight: 500; font-size: 0.9em; }

/* レッスン完了ボタン */
.lesson-complete-zone {
  margin: var(--space-lg) auto 0;
  text-align: center;
}
.lesson-complete-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.85rem 1.6rem;
  background: var(--color-accent-1);
  color: #1a0a04;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 1rem;
  border: 1px solid transparent;
  transition: all var(--transition);
}
.lesson-complete-btn:hover {
  background: var(--color-accent-1-hover);
  transform: translateY(-1px);
}
.lesson-complete-btn.is-completed {
  background: var(--color-accent-2);
  color: #0a1a0e;
}

/* レッスンナビ */
.lesson-nav {
  margin: var(--space-lg) auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xs);
}
@media (min-width: 768px) {
  .lesson-nav { grid-template-columns: 1fr auto 1fr; gap: var(--space-sm); }
}
.lesson-nav__item {
  display: block;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-sub);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-sub);
  text-decoration: none;
  transition: all var(--transition);
  min-height: 60px;
}
.lesson-nav__item:hover {
  border-color: var(--color-accent-1);
  color: var(--color-text);
}
.lesson-nav__item--center {
  text-align: center;
  background: transparent;
  border-color: transparent;
}
.lesson-nav__item--placeholder {
  visibility: hidden;
}
.lesson-nav__item--next { text-align: right; }
.lesson-nav__direction {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-accent-1);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.2em;
}
.lesson-nav__title {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-text);
}

/* コース内レッスン一覧 */
.course-lessons-list {
  margin: var(--space-xl) auto;
}
.course-lessons-list__title {
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-sub);
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}
.course-lessons-list__items {
  list-style: none;
  margin: 0;
  padding: 0;
}
.course-lessons-list__item {
  border-bottom: 1px solid var(--color-border);
}
.course-lessons-list__item:last-child { border-bottom: 0; }
.course-lessons-list__link {
  display: grid;
  grid-template-columns: 50px 1fr auto;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  align-items: center;
  color: var(--color-text-sub);
  text-decoration: none;
  transition: color var(--transition);
}
.course-lessons-list__link:hover { color: var(--color-text); }
.course-lessons-list__num {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-accent-1);
  font-size: 0.85rem;
}
.course-lessons-list__lesson-title {
  color: var(--color-text);
  font-weight: 500;
}
.course-lessons-list__duration {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}
.course-lessons-list__item.is-current {
  background: rgba(217, 119, 87, 0.06);
  border-left: 3px solid var(--color-accent-1);
  padding-left: var(--space-sm);
}
.course-lessons-list__item.is-current .course-lessons-list__lesson-title {
  color: var(--color-accent-1);
}
.course-lessons-list__item.is-completed .course-lessons-list__num::after {
  content: "✓";
  color: var(--color-accent-2);
  margin-left: 0.3em;
}

/* =========================================================
   コース詳細
   ========================================================= */
.single-course__target {
  background: var(--color-bg-elevated);
  border-left: 3px solid var(--color-accent-1);
  padding: var(--space-sm) var(--space-md);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--space-md) 0;
  color: var(--color-text-sub);
}
.course-outcome {
  margin: var(--space-lg) auto;
  background: var(--color-bg-sub);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
}
.course-outcome__title {
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
  color: var(--color-accent-1);
}
.course-outcome__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.course-outcome__list li {
  padding: 0.4em 0 0.4em 1.5em;
  position: relative;
  color: var(--color-text);
}
.course-outcome__list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-accent-2);
  font-weight: 700;
}

.course-progress {
  margin: var(--space-md) 0;
}
.course-progress__bar {
  height: 8px;
  background: var(--color-bg-elevated);
  border-radius: 999px;
  overflow: hidden;
}
.course-progress__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent-1), var(--color-accent-2));
  width: 0%;
  transition: width 0.6s ease;
  border-radius: 999px;
}
.course-progress__label {
  font-size: 0.85rem;
  color: var(--color-text-sub);
  margin-top: var(--space-2xs);
}
.course-progress__count { font-weight: 700; color: var(--color-text); }

.course-lessons {
  margin: var(--space-lg) auto;
}
.course-lessons__title {
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
}
.course-lessons__items {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
}
.course-lessons__item {
  border-bottom: 1px solid var(--color-border);
}
.course-lessons__link {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  align-items: center;
  color: var(--color-text);
  text-decoration: none;
  transition: padding-left var(--transition);
}
.course-lessons__link:hover {
  padding-left: var(--space-xs);
  color: var(--color-text);
}
.course-lessons__num {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-accent-1);
  font-size: 1rem;
}
.course-lessons__main {
  display: flex;
  flex-direction: column;
  gap: 0.2em;
  min-width: 0;
}
.course-lessons__heading {
  font-weight: 600;
  font-size: 1rem;
}
.course-lessons__excerpt {
  font-size: 0.85rem;
  color: var(--color-text-sub);
  line-height: 1.6;
}
.course-lessons__duration {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}
.course-lessons__item.is-completed .course-lessons__num::after {
  content: "✓";
  color: var(--color-accent-2);
  margin-left: 0.3em;
}

.course-reset-btn {
  margin-top: var(--space-md);
  font-size: 0.85rem;
}

/* =========================================================
   AIニュース系
   ========================================================= */
.archive-header {
  padding: var(--space-lg) 0 var(--space-md);
  margin-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}
.archive-header--news .archive-header__eyebrow {
  color: var(--color-error);
}
.archive-header__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-accent-1);
  text-transform: uppercase;
}
.archive-header__title {
  margin: var(--space-xs) 0;
  font-size: clamp(1.75rem, 1.5rem + 1vw, 2.5rem);
}
.archive-header__description {
  color: var(--color-text-sub);
  max-width: 760px;
  line-height: 1.7;
}

.news-pulse {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-error);
  position: relative;
}
.news-pulse::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid var(--color-error);
  opacity: 0.4;
  animation: lucris-pulse 1.6s ease-out infinite;
}
@keyframes lucris-pulse {
  0% { transform: scale(0.5); opacity: 0.6; }
  100% { transform: scale(1.5); opacity: 0; }
}

.news-list {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .news-list { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1200px) {
  .news-list { grid-template-columns: repeat(3, 1fr); }
}
.news-list--home {
  margin-bottom: var(--space-md);
}

.news-card {
  background: var(--color-bg-sub);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}
.news-card:hover {
  border-color: rgba(224, 123, 123, 0.4);
  transform: translateY(-2px);
}
.news-card__inner {
  display: block;
  color: inherit;
  text-decoration: none;
  height: 100%;
}
.news-card__thumb {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}
.news-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.news-card:hover .news-card__thumb img { transform: scale(1.04); }
.news-card__body {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.news-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.78rem;
  color: var(--color-text-muted);
}
.news-card__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.18rem 0.55rem;
  background: rgba(224, 123, 123, 0.12);
  color: var(--color-error);
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
}
.news-card__title {
  font-size: 1.05rem;
  margin: 0;
  line-height: 1.45;
  color: var(--color-text);
}
.news-card:hover .news-card__title { color: var(--color-accent-1-hover); }
.news-card__excerpt {
  font-size: 0.88rem;
  color: var(--color-text-sub);
  line-height: 1.6;
  margin: 0;
}
.news-card__topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-top: var(--space-xs);
}

/* =========================================================
   関連記事
   ========================================================= */
.related-posts {
  margin: var(--space-2xl) auto var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}
.related-posts__title {
  font-size: 1.1rem;
  margin-bottom: var(--space-md);
  color: var(--color-text-sub);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.related-posts__grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .related-posts__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .related-posts__grid { grid-template-columns: repeat(4, 1fr); }
}
.related-card {
  background: var(--color-bg-sub);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
}
.related-card:hover {
  border-color: var(--color-accent-1);
  transform: translateY(-2px);
}
.related-card__inner {
  display: block;
  color: inherit;
  text-decoration: none;
  height: 100%;
}
.related-card__thumb {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}
.related-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.related-card__body {
  padding: var(--space-sm);
}
.related-card__type {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-accent-1);
  margin-bottom: var(--space-2xs);
}
.related-card__heading {
  font-size: 0.92rem;
  line-height: 1.4;
  margin: 0;
  color: var(--color-text);
}

/* =========================================================
   トップページ専用
   ========================================================= */
.hero {
  padding: var(--space-2xl) 0 var(--space-xl);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 800px 400px at 80% 20%, rgba(217, 119, 87, 0.12), transparent 60%),
    radial-gradient(ellipse 600px 400px at 20% 80%, rgba(125, 169, 140, 0.08), transparent 60%);
  pointer-events: none;
  z-index: -1;
}
.hero__inner {
  text-align: center;
}
.hero__eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-accent-1);
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
}
.hero__title {
  font-size: clamp(2rem, 1.5rem + 2.5vw, 3.5rem);
  line-height: 1.2;
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}
.hero__title-line1 { display: block; color: var(--color-text-sub); font-size: 0.7em; margin-bottom: 0.2em; font-weight: 500; }
.hero__title-line2 { display: block; }
.hero__lede {
  font-size: 1.05rem;
  color: var(--color-text-sub);
  max-width: 640px;
  margin: 0 auto var(--space-lg);
  line-height: 1.8;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}

.home-section {
  padding: var(--space-xl) 0;
}
.home-section + .home-section {
  border-top: 1px solid var(--color-border);
}
.section-heading {
  text-align: center;
  margin-bottom: var(--space-lg);
}
.section-heading__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-error);
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}
.section-heading__title {
  font-size: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  margin-bottom: var(--space-2xs);
}
.section-heading__subtitle {
  color: var(--color-text-sub);
  font-size: 0.95rem;
  margin: 0;
}

.section-cta {
  text-align: center;
  margin-top: var(--space-md);
}

/* レベル3カード */
.level-cards {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .level-cards { grid-template-columns: repeat(3, 1fr); }
}
.level-card {
  background: var(--color-bg-sub);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: border-color var(--transition);
}
.level-card--beginner { border-top: 4px solid var(--color-accent-1); }
.level-card--intermediate { border-top: 4px solid var(--color-accent-2); }
.level-card--advanced { border-top: 4px solid #6496DC; }
.level-card:hover { border-color: var(--color-accent-1); }

.level-card__badge {
  display: inline-block;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.78rem;
  background: var(--color-bg-elevated);
}
.level-card--beginner .level-card__badge { color: var(--color-accent-1); }
.level-card--intermediate .level-card__badge { color: var(--color-accent-2); }
.level-card--advanced .level-card__badge { color: #6496DC; }

.level-card__title {
  font-size: 1.05rem;
  line-height: 1.5;
  margin: var(--space-xs) 0 0;
}
.level-card__course {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  padding: var(--space-sm) 0;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}
.level-card__thumb {
  flex: 0 0 80px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 16 / 9;
}
.level-card__thumb img {
  width: 100%; height: 100%; object-fit: cover;
}
.level-card__course-body {
  flex: 1;
  min-width: 0;
}
.level-card__course-title {
  font-size: 0.92rem;
  margin: 0;
  font-weight: 600;
  color: var(--color-text);
}
.level-card__count {
  margin: 0.2em 0 0;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}
.level-card__cta {
  display: inline-flex;
  align-items: center;
  font-weight: 600;
  font-size: 0.9rem;
  padding-top: var(--space-xs);
}

/* レッスンカードのeyebrow */
.post-card__eyebrow {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-accent-1);
  margin-bottom: 0.2em;
}

/* =========================================================
   wp-block コンテンツ全般のダーク調整
   ========================================================= */
.wp-block-image img {
  border-radius: var(--radius-md);
  margin: var(--space-md) 0;
}
.wp-block-quote {
  border-left: 4px solid var(--color-accent-1);
  background: var(--color-bg-elevated);
  margin: var(--space-md) 0;
  padding: var(--space-sm) var(--space-md);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}