/* ========================================
   #Meridian計画 - プロジェクトサイト
   ======================================== */

:root {
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-primary: #0d6efd;
  --color-primary-dark: #0a58ca;
  --color-text: #212529;
  --color-text-muted: #6c757d;
  --color-border: #dee2e6;
  --font-sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --radius: 8px;
  --navbar-height: 64px;

  /* 見出しの級数（font-size）※ここで調整 */
  --heading-h1: 2.0rem;   /* # */
  --heading-h2: 1.5rem;    /* ## */
  --heading-h3: 1.25rem;   /* ### */
  --heading-h4: 1.1rem;    /* #### */

  /* リストの中黒（・）の大きさ ※ここで調整 */
  --list-marker-size: 0.65em;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* ナビゲーションバー */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--color-border);
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: var(--navbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: opacity 0.2s;
}

.logo:hover {
  opacity: 0.85;
}

.logo-img {
  height: 36px;
  width: auto;
  display: block;
  vertical-align: middle;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-link {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
}

/* メインコンテンツ */
main {
  min-height: calc(100vh - var(--navbar-height) - 120px);
  padding-top: 2rem;
  padding-bottom: 3rem;
}

.section {
  display: none;
  animation: fadeIn 0.3s ease;
}

.section.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Markdown コンテンツ */
.markdown-content {
  background: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.markdown-content h1 {
  font-size: var(--heading-h1);
  margin-top: 0;
  margin-bottom: 1rem;
  color: var(--color-primary);
}

.markdown-content h2 {
  font-size: var(--heading-h2);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: baseline;
  color: var(--color-text);
}

.markdown-content h2::after {
  content: "";
  flex: 1;
  margin-left: 0.5em;
  border-bottom: 2px solid var(--color-border);
  min-width: 1em;
}

.markdown-content h3 {
  font-size: var(--heading-h3);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.markdown-content h4 {
  font-size: var(--heading-h4);
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.markdown-content p {
  margin: 0 0 1rem;
}

.markdown-content ul {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

.markdown-content ul li::marker {
  font-size: var(--list-marker-size);
}

.markdown-content li {
  margin-bottom: 0.25rem;
}

.markdown-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

.markdown-content th,
.markdown-content td {
  border: 1px solid var(--color-border);
  padding: 0.3rem 0.75rem;
  text-align: left;
}

.markdown-content th.text-left,
.markdown-content td.text-left {
  text-align: left;
}

.markdown-content th.text-center,
.markdown-content td.text-center {
  text-align: center;
}

.markdown-content th.text-right,
.markdown-content td.text-right {
  text-align: right;
}

.markdown-content th {
  background: var(--color-bg);
  font-weight: 600;
}

.markdown-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}

.markdown-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.5rem 0;
}

/* 画像の配置（class="center" | "left" | "right"） */
.markdown-content img.center {
  margin-left: auto;
  margin-right: auto;
}

.markdown-content img.left {
  float: left;
  margin: 0 1.5rem 1rem 0;
}

.markdown-content img.right {
  float: right;
  margin: 0 0 1rem 1.5rem;
}

.markdown-content img.left,
.markdown-content img.right {
  display: block;
}

/* float の後に続く要素の回り込みを解除 */
.markdown-content img.left + *,
.markdown-content img.right + * {
  clear: both;
}

/* YouTube 埋め込み（16:9 レスポンシブ） */
.markdown-content .youtube-wrap {
  position: relative;
  width: 100%;
  max-width: 560px;
  margin: 1.5rem auto;
}
.markdown-content .youtube-wrap::before {
  content: "";
  display: block;
  padding-top: 56.25%; /* 16:9 */
}
.markdown-content .youtube-wrap iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* ** で囲んだ部分は太字＋ブルー */
.markdown-content strong {
  font-weight: 700;
  color: var(--color-primary);
}

/* * ひとつで囲んだ部分はイタリック＋級数2pt下げ */
.markdown-content em.em-smaller {
  font-style: italic;
  font-size: calc(1em - 2pt);
}

.markdown-content .loading {
  color: var(--color-text-muted);
  text-align: center;
  padding: 2rem;
}

/* News セクション */
.section-title {
  font-size: 1.5rem;
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.news-intro {
  margin-bottom: 1.5rem;
  color: var(--color-text-muted);
}

.news-container {
  background: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.news-links {
  font-size: 1.1rem;
}

.news-links a {
  color: var(--color-primary);
  font-weight: 500;
  text-decoration: none;
}

.news-links a:hover {
  text-decoration: underline;
}

.news-sep {
  color: var(--color-text-muted);
  margin: 0 0.5rem;
}

/* Links セクション（md/links.md から Markdown で表示） */
#links-content a {
  color: var(--color-primary);
}


/* フッター */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 1.5rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer a {
  color: var(--color-primary);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* レスポンシブ */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    padding: 1rem;
    gap: 0.5rem;
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .markdown-content {
    padding: 1.25rem;
  }
}