/* ヨゴト — 白と黒、光のモノトーン。角丸なし・絵文字なし */

/* ライト: 白にうっすら水色 */
:root {
  --bg: #fafdff;
  --bg-soft: #f2f7fb;
  --text: #14171c;
  --dim: #87909c;
  --line: #dfe7ee;
  --line-strong: #14171c;
  --invert-bg: #14171c;
  --invert-text: #fafdff;
  --glow: rgba(90, 130, 180, 0.14);
}

/* ダーク: 黒に藍を混ぜた夜空 */
:root[data-theme="dark"] {
  --bg: #0a0e1c;
  --bg-soft: #0e1324;
  --text: #e8ecf5;
  --dim: #7f87a0;
  --line: #232a42;
  --line-strong: #e8ecf5;
  --invert-bg: #e8ecf5;
  --invert-text: #0a0e1c;
  --glow: rgba(170, 195, 255, 0.16);
}

/* 太陽の動きに合わせた空色（日の出・日の入りデータから data-phase を付与）
   day=日中 / dusk=日没後1時間 / night=夜 / predawn=日の出前1時間 */
:root:not([data-theme="dark"])[data-phase="dusk"]    { --bg: #fdfbf6; --bg-soft: #f8f3ea; }
:root:not([data-theme="dark"])[data-phase="night"]   { --bg: #f3f6fa; --bg-soft: #eaf0f6; }
:root:not([data-theme="dark"])[data-phase="predawn"] { --bg: #f7fafc; --bg-soft: #eef5f9; }
:root[data-theme="dark"][data-phase="day"]     { --bg: #0f1424; --bg-soft: #131a30; }
:root[data-theme="dark"][data-phase="dusk"]    { --bg: #100e20; --bg-soft: #16132c; }
:root[data-theme="dark"][data-phase="predawn"] { --bg: #0c1428; --bg-soft: #111c36; }

* { margin: 0; padding: 0; box-sizing: border-box; border-radius: 0; }

/* display:flex 等の指定より hidden 属性を優先させる */
[hidden] { display: none !important; }

html, body { height: 100%; }

body {
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  letter-spacing: 0.02em;
  /* テーマ切替は素早く、空のフェーズ変化は空が変わるようにゆっくり */
  transition: background 3s ease, color 0.25s;
}

/* ---- ヘッダー ---- */
header {
  position: sticky; top: 0; z-index: 5;
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.7rem 1.2rem;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.logo {
  font-size: 1.15rem; font-weight: bold; letter-spacing: 0.35em;
}
.logo-sub {
  font-size: 0.62rem; font-weight: normal; color: var(--dim);
  margin-left: 0.8em; letter-spacing: 0.15em;
}
.header-right { display: flex; align-items: center; gap: 0.9rem; }
#countdown {
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem; color: var(--dim); letter-spacing: 0.08em;
}
#countdown::before { content: "日の出まで "; }

.icon-btn {
  background: none; border: none; color: var(--dim);
  font-size: 1rem; cursor: pointer;
  padding: 0.25rem 0.4rem; display: inline-flex; align-items: center;
}
.icon-btn:hover { color: var(--text); }

.text-btn, .link-btn {
  background: none; border: none; color: var(--dim);
  font: inherit; cursor: pointer;
}
.text-btn:hover, .link-btn:hover { color: var(--text); }
.link-btn { text-decoration: underline; text-underline-offset: 3px; }

/* ---- メイン ---- */
main { max-width: 640px; margin: 0 auto; padding: 1.6rem 1.2rem 4rem; }

/* ---- 投稿フォーム ---- */
#composer {
  border: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 1rem; margin-bottom: 1.6rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
#composer:focus-within { border-color: var(--line-strong); box-shadow: 0 0 20px var(--glow); }
#composer textarea, .thread-composer textarea {
  width: 100%; background: none; border: none; resize: vertical;
  color: var(--text); font: inherit; outline: none;
}
#composer textarea::placeholder, .thread-composer textarea::placeholder { color: var(--dim); }
.composer-row { display: flex; align-items: center; gap: 0.8rem; margin-top: 0.6rem; }
#composerTags {
  flex: 1; min-width: 0; background: none; color: var(--text);
  border: none; border-bottom: 1px solid var(--line);
  font-size: 0.85rem; outline: none; padding: 0.2rem 0;
}
#composerTags:focus { border-bottom-color: var(--line-strong); }
#charCount { font-size: 0.72rem; color: var(--dim); font-variant-numeric: tabular-nums; }

.primary-btn {
  background: var(--invert-bg); color: var(--invert-text);
  border: 1px solid var(--invert-bg);
  padding: 0.4rem 1.4rem; cursor: pointer;
  font: inherit; font-size: 0.88rem; letter-spacing: 0.15em; white-space: nowrap;
  transition: box-shadow 0.2s;
}
.primary-btn:hover { box-shadow: 0 0 18px var(--glow); }
.primary-btn:disabled { opacity: 0.4; cursor: wait; }

.msg { margin-top: 0.5rem; font-size: 0.85rem; color: var(--text); border-left: 2px solid var(--line-strong); padding-left: 0.6rem; }

/* ---- タブ ---- */
#tabs { display: flex; border-bottom: 1px solid var(--line); margin-bottom: 1.2rem; }
.tab {
  background: none; border: none; color: var(--dim);
  font: inherit; font-size: 0.88rem; letter-spacing: 0.1em; cursor: pointer;
  padding: 0.5rem 1rem; border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--text); border-bottom-color: var(--line-strong); }

/* ---- タグ絞り込み ---- */
#tagFilter {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.85rem; margin-bottom: 1rem;
}

/* ---- 独白リスト ---- */
#postList, #threadList { list-style: none; }
.post {
  border: 1px solid var(--line);
  background: var(--bg);
  padding: 1rem 1.1rem; margin-bottom: -1px;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.post:hover { border-color: var(--line-strong); box-shadow: 0 0 22px var(--glow); position: relative; z-index: 1; }
.post.appear { animation: appear 0.4s ease-out; }
@keyframes appear { from { opacity: 0; } to { opacity: 1; } }

.post-content { white-space: pre-wrap; word-break: break-word; }
.post-content.clamped {
  display: -webkit-box;
  -webkit-line-clamp: 8;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.read-more { margin-top: 0.4rem; font-size: 0.78rem; color: var(--dim); letter-spacing: 0.15em; }
.post:hover .read-more { color: var(--text); }

.post-tags { margin-top: 0.5rem; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag-chip {
  background: none; border: 1px solid var(--line);
  color: var(--dim); font-size: 0.75rem; cursor: pointer;
  padding: 0 0.6rem; font-family: inherit; letter-spacing: 0.05em;
}
.tag-chip:hover { color: var(--text); border-color: var(--line-strong); }

.post-foot {
  display: flex; align-items: center; gap: 1rem;
  margin-top: 0.6rem; font-size: 0.78rem; color: var(--dim);
}
.post-num { font-variant-numeric: tabular-nums; color: var(--dim); }
.post-time { font-variant-numeric: tabular-nums; }
.mine-mark { font-size: 0.72rem; letter-spacing: 0.1em; border: 1px solid var(--line); padding: 0 0.4rem; }
.spacer { flex: 1; }

.foot-btn {
  background: none; border: none; color: var(--dim);
  font: inherit; font-size: 0.78rem; cursor: pointer;
  padding: 0.1rem 0.3rem; display: inline-flex; align-items: center; gap: 0.35rem;
}
.foot-btn:hover { color: var(--text); }
.foot-btn svg { display: block; }
.mita-btn.done { color: var(--text); text-shadow: 0 0 10px var(--glow); cursor: default; }
.mita-count { font-variant-numeric: tabular-nums; }

#emptyState { text-align: center; color: var(--dim); padding: 3.5rem 0; font-size: 0.9rem; }

/* ---- スレッドビュー（しっかり読む） ---- */
#backBtn { margin-bottom: 1.2rem; font-size: 0.85rem; letter-spacing: 0.1em; }
#backBtn::before { content: "\2190\00a0"; }
#threadView .post { cursor: default; }
.thread-composer {
  display: flex; gap: 0.8rem; align-items: flex-end;
  border: 1px solid var(--line); background: var(--bg-soft);
  padding: 0.8rem; margin-top: 1.2rem;
}
.thread-composer:focus-within { border-color: var(--line-strong); box-shadow: 0 0 20px var(--glow); }

/* ---- フッター ---- */
footer {
  text-align: center; font-size: 0.72rem; color: var(--dim);
  padding: 1.5rem 1rem 2.5rem;
  border-top: 1px solid var(--line);
}
.footer-links { margin-top: 0.5rem; }
.footer-links a { color: var(--dim); text-underline-offset: 3px; }
.footer-links a:hover { color: var(--text); }

/* ---- オーバーレイ ---- */
.overlay {
  position: fixed; inset: 0; z-index: 10;
  background: var(--glow);
  backdrop-filter: blur(2px);
  display: flex; justify-content: center; align-items: flex-start;
  padding: 5rem 1rem 2rem; overflow-y: auto;
}
.panel {
  width: 100%; max-width: 560px;
  background: var(--bg); border: 1px solid var(--line-strong);
  padding: 1.2rem 1.4rem;
  box-shadow: 0 0 60px var(--glow);
}
.panel-head {
  display: flex; justify-content: space-between; align-items: center;
  font-weight: bold; letter-spacing: 0.1em; margin-bottom: 0.8rem;
}
.about p, .about li { font-size: 0.85rem; color: var(--dim); }
.about ul { padding-left: 1.2rem; margin-top: 0.6rem; }

/* ---- 夜明け演出（光） ---- */
#dawn {
  position: fixed; inset: 0; z-index: 100;
  background: #ffffff;
  display: flex; justify-content: center; align-items: center;
  opacity: 0; animation: dawn-rise 5s ease-in-out forwards;
}
@keyframes dawn-rise {
  0% { opacity: 0; }
  25% { opacity: 1; }
  75% { opacity: 1; }
  100% { opacity: 0; }
}
#dawnText {
  color: #141414; font-size: 1.15rem; text-align: center;
  letter-spacing: 0.25em; line-height: 2.4;
}

@media (max-width: 480px) {
  .logo-sub { display: none; }
  #countdown { font-size: 0.68rem; }
  .tab { padding: 0.5rem 0.6rem; font-size: 0.8rem; }
}