/* ============================================================================
   視覺調性：安靜、留白、柔和；直式優先、文字置中；Noto Sans CJK TC。
   溫潤、當下、不懷舊。
   ============================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@300;400;500&family=Noto+Serif+TC:wght@400;500&display=swap');

:root {
  --ink:        #2b2b2b;
  --ink-soft:   #6b6b6b;
  --ink-faint:  #a29a8e;   /* 編號等次要文字 */
  --paper:      #f6f4ef;   /* 溫潤米白 */
  --line:       rgba(0, 0, 0, 0.09);
  --accent:     #8a9aa3;   /* 柔和霧藍灰 */
  --maxw:       640px;     /* 直式優先，內容不過寬 */
  --catalog-maxw: 1040px;  /* 目錄多欄時的最大寬 */
  --ease:       cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Noto Sans TC', system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

/* ─── 首頁 ─────────────────────────────────────────────────────────────────── */
.site-header {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 4.5rem 1.5rem 2.5rem;
  text-align: center;
}
.site-header h1 {
  font-family: 'Noto Serif TC', serif;
  font-weight: 500;
  font-size: 1.6rem;
  letter-spacing: 0.12em;
  margin: 0 0 0.75rem;
}
.site-header p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  font-weight: 300;
  margin: 0;
  letter-spacing: 0.04em;
}

/* ─── 目錄（首頁）：編號 + 標題，單行；手機一欄、寬螢幕多欄 ─────────────────── */
.wrap { max-width: var(--catalog-maxw); margin: 0 auto; padding: 0 1.5rem; }

.toolbar {
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
  justify-content: center; padding: 0.5rem 0 2rem;
}
.search { flex: 1 1 340px; max-width: 460px; position: relative; }
.search input {
  width: 100%; font: inherit; font-weight: 300; color: var(--ink);
  background: transparent; border: none; border-bottom: 1px solid var(--line);
  padding: 0.6rem 0.4rem 0.6rem 1.6rem; letter-spacing: 0.04em;
  transition: border-color 0.3s var(--ease);
}
.search input:focus { outline: none; border-color: var(--accent); }
.search::before {
  content: '⌕'; position: absolute; left: 0.2rem; top: 50%;
  transform: translateY(-50%); color: var(--ink-faint); font-size: 1.1rem;
}
.count { color: var(--ink-faint); font-size: 0.82rem; letter-spacing: 0.04em; white-space: nowrap; }

.catalog-root { padding-bottom: 4rem; }

/* 空搜尋著陸：提示 + 收錄概覽（不列詩） */
.home-empty { padding: 1.5rem 0 4rem; }
.home-hint {
  text-align: center; color: var(--ink-soft); font-weight: 300;
  letter-spacing: 0.05em; margin: 0 0 2.5rem;
}
.summary { list-style: none; margin: 0 auto; padding: 0; max-width: var(--maxw); }
.summary__item {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  align-items: baseline; padding: 1rem 0.4rem; border-bottom: 1px solid var(--line);
}
.summary__title {
  font-family: 'Noto Serif TC', serif; font-weight: 500; font-size: 1.1rem; letter-spacing: 0.08em;
}
.summary__count { color: var(--ink-faint); font-size: 0.82rem; letter-spacing: 0.03em; }

/* 搜尋結果：詩集/部標題 + 命中清單 */
.collection__head {
  display: flex; align-items: baseline; gap: 1rem;
  margin: 2rem 0 1rem; padding-bottom: 0.6rem; border-bottom: 1px solid var(--ink);
}
.collection__head:first-child { margin-top: 0.5rem; }
.collection__title {
  font-family: 'Noto Serif TC', serif; font-weight: 500; font-size: 1.2rem;
  letter-spacing: 0.12em; margin: 0;
}
.part__title {
  font-family: 'Noto Serif TC', serif; font-weight: 500; font-size: 1rem;
  letter-spacing: 0.14em; color: var(--ink-soft); margin: 1.5rem 0 0.6rem;
}

.catalog {
  display: grid; grid-template-columns: 1fr; gap: 0 3rem;
}
@media (min-width: 640px) { .catalog { grid-template-columns: 1fr 1fr; } }
@media (min-width: 960px) { .catalog { grid-template-columns: 1fr 1fr 1fr; } }

.entry {
  display: flex; align-items: baseline; gap: 0.9rem;
  padding: 0.78rem 0.4rem; text-decoration: none; color: inherit;
  border-bottom: 1px solid var(--line); transition: background 0.25s var(--ease);
}
.entry:hover { background: rgba(0,0,0,0.03); }
.entry__no {
  flex: 0 0 auto; width: 2.4rem; font-family: 'Noto Serif TC', serif;
  font-size: 0.8rem; color: var(--ink-faint); letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
}
.entry:hover .entry__no { color: var(--accent); }
.entry__title {
  font-family: 'Noto Serif TC', serif; font-weight: 500; font-size: 1.06rem;
  letter-spacing: 0.06em; line-height: 1.5;
}
.empty { text-align: center; color: var(--ink-faint); padding: 3rem; grid-column: 1 / -1; }

.state {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--ink-soft);
  font-weight: 300;
}

/* ─── 單首 /poems/{book}/{seq} ────────────────────────────────────────────── */
.poem-stage {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;      /* 首屏滿版；下方可捲到注釋 */
  overflow: hidden;
  background: #1c1c1c;
  display: flex;
  flex-direction: column;
}
.poem-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* 極慢 Ken Burns，安靜地動 */
  animation: kenburns 40s ease-in-out infinite alternate;
}
@keyframes kenburns {
  from { transform: scale(1.04) translate(0, 0); }
  to   { transform: scale(1.12) translate(-1.5%, -1.5%); }
}
.poem-bg__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.28) 0%, rgba(0,0,0,0.12) 40%, rgba(0,0,0,0.45) 100%);
}

.poem-content {
  position: relative;
  z-index: 2;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem 1.5rem;
  color: #fff;
}
.poem-title {
  font-family: 'Noto Serif TC', serif;
  font-weight: 400;
  font-size: 1.05rem;
  letter-spacing: 0.22em;
  opacity: 0.85;
  margin: 0 0 2rem;
  text-shadow: 0 1px 10px rgba(0,0,0,0.4);
}
.poem-lines {
  font-family: 'Noto Serif TC', serif;
  font-size: clamp(1.35rem, 5.5vw, 1.9rem);
  line-height: 2.4;
  letter-spacing: 0.08em;
  margin: 0 0 2.5rem;
  text-shadow: 0 2px 16px rgba(0,0,0,0.5);
}
.poem-lines p { margin: 0.2rem 0; }

.poem-pending {
  font-family: 'Noto Serif TC', serif;
  font-size: 1.05rem;
  font-weight: 300;
  letter-spacing: 0.16em;
  opacity: 0.7;
  margin: 1rem 0 2.5rem;
  text-shadow: 0 1px 10px rgba(0,0,0,0.4);
}

.controls {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}
.icon-btn {
  appearance: none;
  border: 1px solid rgba(255,255,255,0.55);
  background: rgba(255,255,255,0.10);
  color: #fff;
  width: 56px; height: 56px;
  border-radius: 999px;
  font-size: 1.2rem;
  cursor: pointer;
  backdrop-filter: blur(6px);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s var(--ease), transform 0.3s var(--ease);
}
.icon-btn:hover { background: rgba(255,255,255,0.22); transform: scale(1.05); }

.back-link {
  position: absolute;
  z-index: 3;
  top: 1.25rem; left: 1.25rem;
  color: #fff;
  opacity: 0.8;
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-shadow: 0 1px 8px rgba(0,0,0,0.4);
}
.back-link:hover { opacity: 1; }

/* 往下滑提示（有注釋時，浮在首屏底部） */
.scroll-hint {
  position: absolute;
  z-index: 2;
  bottom: 1.5rem; left: 50%;
  transform: translateX(-50%);
  color: #fff; opacity: 0.85;
  text-decoration: none;
  font-size: 0.8rem; letter-spacing: 0.16em;
  text-shadow: 0 1px 8px rgba(0,0,0,0.45);
  animation: hint-bob 2.6s ease-in-out infinite;
}
.scroll-hint:hover { opacity: 1; }
@keyframes hint-bob {
  0%, 100% { transform: translate(-50%, 0); }
  50%      { transform: translate(-50%, 5px); }
}

/* ─── 注釋（首屏下方）───────────────────────────────────────────────────────── */
.poem-notes {
  background: var(--paper);
  color: var(--ink);
  padding: 4rem 1.5rem 5rem;
}
.poem-notes__inner { max-width: var(--maxw); margin: 0 auto; }
.poem-notes__h {
  font-family: 'Noto Serif TC', serif;
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: 0.22em;
  text-align: center;
  color: var(--ink-soft);
  margin: 0 0 2rem;
}
.poem-notes__body {
  font-size: 1rem;
  font-weight: 300;
  line-height: 2.1;
  letter-spacing: 0.03em;
}
.note-item { margin: 0 0 0.9rem; }

.hidden { display: none !important; }

/* 尊重使用者的減少動態偏好 */
@media (prefers-reduced-motion: reduce) {
  .poem-bg { animation: none; }
  .scroll-hint { animation: none; }
  * { transition-duration: 0.01ms !important; }
}