/* ==========================================================================
   現代文キーワード210 — 辞典のように読みやすいシンプルデザイン
   ========================================================================== */

:root{
  --font-serif: "Shippori Mincho", "Noto Serif JP", "游明朝", "Yu Mincho", serif;
  --font-ui: "Hiragino Sans", "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --color-paper: #fbf9f3;
  --color-paper-2: #f5f1e6;
  --color-ink: #262320;
  --color-ink-soft: #6f665a;
  --color-line: #ddd4c0;
  --color-accent: #8a5a34;
  --color-accent-soft: #b98a5e;

  --header-h: 96px;
  --search-h: 60px;
}

*{ box-sizing: border-box; }
html,body{
  margin:0; padding:0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
}
ul{ list-style:none; margin:0; padding:0; }
h1,h2,h3,p{ margin:0; }
button{ font-family: inherit; cursor:pointer; }

/* ============================ ヘッダー ============================ */
#site-header{
  background: var(--color-paper);
  border-bottom: 1px solid var(--color-line);
  padding: 22px 20px 16px;
  text-align:center;
}
.site-title{
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 24px;
  letter-spacing: 0.06em;
  color: var(--color-ink);
}
.site-title-num{
  color: var(--color-accent);
  margin-left: 2px;
}
.site-subtitle{
  font-size: 11.5px;
  color: var(--color-ink-soft);
  letter-spacing: 0.15em;
  margin-top: 4px;
}

/* ============================ 検索バー ============================ */
#search-bar-wrap{
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(251,249,243,0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-line);
  padding: 10px 20px;
}
.search-bar-inner{ max-width: 760px; margin: 0 auto; }
.search-box{
  display:flex;
  align-items:center;
  gap: 10px;
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: 10px;
  padding: 10px 14px;
}
.search-icon{
  font-size: 11px;
  color: var(--color-ink-soft);
  letter-spacing: 0.05em;
  flex-shrink:0;
}
#search-input{
  flex:1;
  border:none;
  outline:none;
  background:transparent;
  font-size: 16px;
  color: var(--color-ink);
  font-family: var(--font-ui);
}
#search-input::placeholder{ color: #a89f8f; }
.search-clear{
  border:none;
  background: var(--color-paper-2);
  color: var(--color-ink-soft);
  width: 24px; height:24px;
  border-radius:50%;
  font-size: 14px;
  line-height:1;
  display:none;
  align-items:center;
  justify-content:center;
}
.search-clear.show{ display:flex; }
.result-count{
  font-size: 11.5px;
  color: var(--color-ink-soft);
  margin-top: 6px;
  padding-left: 4px;
  min-height: 14px;
}

/* ============================ ページ全体レイアウト ============================ */
#page-body{
  max-width: 900px;
  margin: 0 auto;
  padding: 0 0 90px;
  position: relative;
}

/* ============================ 章ナビ（目次） ============================ */
#chapter-nav{
  padding: 16px 20px 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
#chapter-nav-list{
  display:flex;
  gap: 10px;
}
.chapter-nav-btn{
  flex-shrink:0;
  border: 1px solid var(--color-line);
  background: #fff;
  color: var(--color-ink-soft);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight:600;
  white-space:nowrap;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.chapter-nav-btn.active{
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* ============================ 単語一覧（本文） ============================ */
#dictionary-main{ padding: 8px 20px 0; }

.chapter-section{ margin-top: 34px; }
.chapter-section:first-of-type{ margin-top: 18px; }

.chapter-heading{
  display:flex;
  align-items:baseline;
  gap: 12px;
  border-bottom: 2px solid var(--color-ink);
  padding-bottom: 8px;
  margin-bottom: 4px;
}
.chapter-heading-title{
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.chapter-heading-sub{
  font-size: 11.5px;
  color: var(--color-ink-soft);
}

.word-entry{
  display: flex;
  gap: 16px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--color-line);
  scroll-margin-top: 130px;
}
.word-entry-no{
  flex-shrink:0;
  width: 34px;
  padding-top: 4px;
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--color-accent-soft);
  text-align:right;
}
.word-entry-body{ flex:1; min-width:0; }

.word-term-row{
  display:flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 6px;
}
.word-term{
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: 0.02em;
}
.word-term ruby{ ruby-position: over; }
.word-term rt{
  font-family: var(--font-ui);
  font-size: 10.5px;
  font-weight: 400;
  color: var(--color-ink-soft);
  letter-spacing: 0;
}

.word-meaning{
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-ink);
  font-family: var(--font-serif);
}

mark.hit{
  background: #f4dfa5;
  color: inherit;
  border-radius: 2px;
  padding: 0 1px;
}

.no-result-message{
  text-align:center;
  color: var(--color-ink-soft);
  font-size: 14px;
  padding: 60px 20px;
}

/* ============================ 五十音インデックス ============================ */
#kana-index{
  position: fixed;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  display:flex;
  flex-direction:column;
  gap: 2px;
  z-index: 30;
}
.kana-index-btn{
  border:none;
  background: transparent;
  color: var(--color-accent-soft);
  font-size: 11px;
  font-weight:600;
  width: 22px;
  height: 18px;
  border-radius: 4px;
}
.kana-index-btn:active{ background: var(--color-paper-2); }

/* ============================ トップへ戻る ============================ */
#back-to-top{
  position: fixed;
  right: 16px;
  bottom: 20px;
  width: 46px; height:46px;
  border-radius: 50%;
  border: 1px solid var(--color-line);
  background: #fff;
  color: var(--color-accent);
  font-size: 18px;
  box-shadow: 0 4px 14px rgba(60,45,20,0.12);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
  z-index: 35;
}
#back-to-top.show{ opacity:1; visibility:visible; transform: translateY(0); }

/* ============================ レスポンシブ ============================ */
@media (min-width: 700px){
  .site-title{ font-size: 28px; }
  #dictionary-main{ padding: 8px 40px 0; }
  #chapter-nav{ padding: 20px 40px 4px; }
  .word-term{ font-size: 23px; }
  .word-meaning{ font-size: 16px; }
  #kana-index{ right: 16px; }
}

@media (min-width: 1000px){
  #page-body{ max-width: 980px; }
  #kana-index{ right: 24px; gap: 4px; }
  .kana-index-btn{ font-size: 12px; }
}

@media (max-width: 420px){
  .word-entry{ gap: 10px; }
  .word-entry-no{ width: 26px; font-size: 12px; }
  .word-term{ font-size: 19px; }
  .word-meaning{ font-size: 14.5px; }
  #kana-index{ right: 2px; }
  .kana-index-btn{ width:18px; font-size: 10px; }
}