/* =========================================================
   urakata-tools 共通スタイル（.card対応版）
   最終版：上部余白対策（margin reset & 相殺防止）入り
   ========================================================= */

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

:root {
  --bg: #fdfdfd;
  --text: #333;
  --muted: #555;
  --line: #ddd;
  --panel: #fafafa;
  --panel-hover: #f2f2f2;
  --hero: #f0f4f8;
  --shadow-1: 0 1px 0 rgba(0,0,0,0.02);
  --shadow-2: 0 6px 18px rgba(0,0,0,0.06);
}

/* ===== 上部の謎の余白を消す最小リセット ===== */
html, body { height: 100%; margin: 0; padding: 0; }
/* 見出しのデフォルト margin-top を0にして相殺を防止 */
h1, h2, h3, h4, h5, h6 { margin: 0 0 .5rem; }
/* セクションや本文の先頭に予期せぬ余白が出ないように */
main, section { margin-top: 0; }
/* header直上の相殺防止。見た目は変えず、相殺だけ止める */
header { border-top: 1px solid transparent; }

/* ここから通常のスタイル定義 */
body {
  font-family: 'Helvetica Neue', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* アクセシビリティ */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* ヘッダー */
header {
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky; top: 0; z-index: 1000;
}

.logo { font-size: 1.5rem; font-weight: 700; }
.logo a { color: inherit; text-decoration: none; }

/* ハンバーガーメニュー */
.hamburger-menu { position: relative; }
.menu-icon { cursor: pointer; display: inline-block; }
.menu-icon span {
  display: block; width: 25px; height: 3px;
  background: var(--text); margin: 5px 0; transition: .4s;
}
#menu-toggle { display: none; }

.menu {
  list-style: none;
  margin: 0; padding: .5rem;
  display: none;
  position: absolute; right: 0; top: 100%;
  background: #fff; border: 1px solid var(--line);
  box-shadow: 0 6px 20px rgba(0,0,0,.08);
  min-width: 220px; z-index: 1001;
}
#menu-toggle:checked + .menu-icon + .menu {
  display: flex; flex-direction: column; gap: .25rem;
}
.menu a {
  display: block; padding: .6rem .8rem;
  text-decoration: none; color: var(--text);
  white-space: nowrap;
}
.menu a:hover, .menu a:focus { background: #f5f5f5; }

/* ヒーロー */
.hero {
  padding: 3rem 1.5rem;
  background: var(--hero);
  text-align: center;
  /* 念のため：ヒーロー自体の上マージンも0に固定 */
  margin-top: 0;
}
.hero h1 { font-size: 2rem; margin-bottom: 1rem; }
.hero p { font-size: 1rem; color: #555; margin: 0; }

/* =========================
   カード共通スタイル
   ========================= */
.card {
  display: block;
  padding: 1.5rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow-1);
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.card:hover, .card:focus {
  background: var(--panel-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  outline: none;
}

/* =========================
   ツール一覧
   ========================= */
.tool-links {
  padding: 2rem clamp(1rem, 5vw, 10rem);
  background: #fff;
}
.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}
.tool-card { min-height: 170px; text-align: left; }
.tool-title { margin: 0 0 .45rem; font-size: 1.15rem; font-weight: 700; }
.tool-desc { margin: 0; font-size: .95rem; color: #555; line-height: 1.7; }
.tool-cta {
  display: inline-block; margin-top: .9rem;
  font-size: .85rem; padding: .35rem .6rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
}
@media (min-width: 1024px) {
  .tool-card { min-height: 200px; padding: 1.6rem 1.4rem; }
  .tool-title { font-size: 1.22rem; }
  .tool-desc { font-size: 1rem; }
}
@media (max-width: 720px) {
  .tool-grid { grid-template-columns: 1fr; }
}

/* =========================
   記事プレビュー（トップページ）
   ========================= */
.articles-preview {
  padding: 2rem 1.5rem;
  background: #f9f9f9;
}
.article-list { padding-left: 1rem; margin: 0; }
.article-list li { margin-bottom: .75rem; }

/* =========================
   フッター
   ========================= */
footer {
  padding: 1.5rem;
  text-align: center;
  font-size: .9rem;
  color: #aaa;
  background: #f4f4f4;
  border-top: 1px solid var(--line);
}

/* =========================
   記事一覧カード
   ========================= */
.post-links {
  padding: 2rem clamp(1rem, 5vw, 10rem);
  background: #fff;
}
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}
@media (max-width: 1100px) {
  .post-grid { grid-template-columns: repeat(2, minmax(240px, 1fr)); }
}
@media (max-width: 720px) {
  .post-grid { grid-template-columns: 1fr; }
}

.post-card { display: grid; grid-template-rows: auto 1fr; gap: .85rem; }
.post-body { display: grid; gap: .5rem; }
.post-title { margin: 0; font-size: 1.05rem; font-weight: 700; }
.post-excerpt { margin: 0; color: var(--muted); font-size: .95rem; line-height: 1.7; }
.post-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  margin-top: .25rem;
  font-size: .85rem;
  color: #666;
}
.post-tags {
  display: flex; gap: .4rem;
  list-style: none; margin: 0; padding: 0;
}
.tag {
  border: 1px solid var(--line);
  background: #fff;
  padding: .2rem .5rem;
  border-radius: 999px;
  font-size: .8rem;
}

/* =========================
   About（作成者情報）
   ========================= */
.about {
  background: #fff;
  padding: 2rem clamp(1rem, 5vw, 10rem);
}
.about-inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 2rem;
  align-items: start;
}
@media (max-width: 860px) {
  .about-inner { grid-template-columns: 1fr; }
}
.about-photo {
  width: 220px; height: 220px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: repeating-linear-gradient(45deg, #fafafa 0 12px, #f3f3f3 12px 24px);
  justify-self: center;
}
.about-photo img {
  width: 100%; height: 100%;
  object-fit: cover; border-radius: 6px;
}
.about-list { margin: 0 0 1rem; padding: 0; }
.about-row {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 1rem;
  align-items: start;
  padding: .5rem 0;
}
.about-row + .about-row { border-top: 1px dotted var(--line); }
.about-row dt { font-weight: 600; color: var(--text); margin: 0; }
.about-row dd { margin: 0; color: var(--text); }
.about-bio { margin-top: 1rem; color: var(--muted); line-height: 1.9; }

/* =========================
   Article Page
   ========================= */
.article-page {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem clamp(1rem, 5vw, 3rem);
  background: #fff;
}
.article-header {
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1rem;
}
.article-title {
  margin: 0 0 .4rem;
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
  font-weight: 800;
  line-height: 1.25;
}
.article-lead { margin: 0 0 .6rem; color: var(--muted); }
.article-meta {
  display: flex; align-items: center; gap: .5rem;
  color: #777; font-size: .9rem;
}
.article-meta .dot { opacity: .6; }
.article-toc {
  margin: 1.25rem 0 1.75rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: .9rem 1rem;
}
.article-toc ol {
  margin: 0; padding-left: 1.2rem;
  display: grid; gap: .35rem;
}
.article-toc a {
  color: inherit; text-decoration: none;
}
.article-toc a:hover { text-decoration: underline; }
.article-section { margin: 1.5rem 0; }
.article-section h2 {
  font-size: clamp(1.15rem, 2.3vw, 1.4rem);
  margin: 0 0 .5rem; /* 上マージンは0固定 */
}
.article-section ul { padding-left: 1.2rem; }
.article-section p { margin: .25rem 0 .75rem; }

/* ボタン */
.btn {
  display: inline-block;
  padding: .55rem .95rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--text);
  text-decoration: none;
  font-size: .95rem;
  transition: background .15s ease, transform .1s ease, box-shadow .15s ease;
  box-shadow: var(--shadow-1);
}
.btn:hover {
  background: #f5f5f5;
  transform: translateY(-1px);
  box-shadow: var(--shadow-2);
}
.btn.is-ghost { background: var(--panel); }
.article-cta, .article-bottom-nav {
  display: flex; gap: .6rem; flex-wrap: wrap;
}
.article-cta { margin-top: .4rem; }
.article-bottom-nav {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

/* キーボードキー表示 */
.article-page kbd {
  padding: .1rem .35rem;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: #fff;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .85em;
}

/* モバイル調整 */
@media (max-width: 640px) {
  .article-page { padding: 1.25rem 1rem; }
  .article-toc { padding: .75rem .8rem; }
}