/* DEEP Diver 2 — World Board
   黒ベース / 多言語 / レスポンシブ
   配色は本体サイト(index.html)と統一 */
:root{
  --bg:#04070d;
  --bg2:#0a1626;
  --panel:rgba(14,28,48,.55);
  --panel-solid:#0c1a2e;
  --ink:#e8f1ff;
  --sub:#9fb4cc;
  --accent:#27d0c8;
  --accent2:#1a8fff;
  --line:rgba(120,170,220,.18);
  --line-strong:rgba(120,170,220,.32);
  --danger:#ff6b81;
  --radius:16px;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic","Segoe UI","Noto Sans",
    "Noto Sans JP","Noto Sans SC","Noto Sans KR","Noto Sans Arabic",sans-serif;
  background:radial-gradient(120% 80% at 50% -10%, var(--bg2) 0%, var(--bg) 60%);
  color:var(--ink);
  min-height:100vh;
  display:flex;flex-direction:column;
  -webkit-font-smoothing:antialiased;
}
/* RTL（アラビア語等）対応 */
body[dir="rtl"]{direction:rtl}
a{color:inherit}

/* ---------- ヘッダー ---------- */
.site-header{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px 24px;border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:30;
  background:rgba(4,7,13,.82);backdrop-filter:blur(10px);
}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.04em;text-decoration:none}
.brand .mark{
  width:34px;height:34px;border-radius:9px;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  display:grid;place-items:center;font-size:18px;
}
.site-nav{display:flex;align-items:center}
.site-nav a{
  color:var(--sub);text-decoration:none;margin-inline-start:20px;font-size:14px;transition:color .2s;
}
.site-nav a:hover{color:var(--ink)}
.site-nav a.active{color:var(--accent)}
.header-right{display:flex;align-items:center;gap:10px}
.uilang-wrap{display:flex;align-items:center;gap:6px;
  background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:6px 12px}
.uilang-wrap .globe{font-size:14px}
#uiLangSelect{
  background:transparent;color:var(--ink);border:0;font-size:13px;outline:none;cursor:pointer;
}
#uiLangSelect option{background:var(--panel-solid);color:var(--ink)}

/* ---------- レイアウト ---------- */
.board-shell{
  flex:1;width:100%;max-width:1180px;margin:0 auto;
  display:grid;grid-template-columns:248px 1fr;gap:24px;
  padding:24px;
}

/* ---------- サイドバー ---------- */
.sidebar{
  position:sticky;top:78px;align-self:start;
  display:flex;flex-direction:column;gap:22px;
  max-height:calc(100vh - 100px);overflow:auto;
  padding-bottom:8px;
}
.sidebar-section{display:flex;flex-direction:column;gap:10px}
.sb-title{font-size:12.5px;color:var(--sub);font-weight:700;letter-spacing:.06em;text-transform:uppercase}
.chip-row{display:flex;flex-wrap:wrap;gap:7px}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 11px;border-radius:999px;cursor:pointer;font-size:12.5px;
  background:var(--panel);border:1px solid var(--line);color:var(--sub);
  transition:.15s;user-select:none;white-space:nowrap;
}
.chip:hover{border-color:var(--line-strong);color:var(--ink)}
.chip.active{
  background:linear-gradient(135deg,rgba(39,208,200,.18),rgba(26,143,255,.18));
  border-color:var(--accent);color:var(--ink);
}
.chip .flag{font-size:14px;line-height:1}
.chip .count{opacity:.6;font-size:11px}
.sidebar-note{font-size:12px;color:var(--sub);line-height:1.7;
  border-top:1px solid var(--line);padding-top:14px}

/* ---------- メイン ---------- */
.board-main{display:flex;flex-direction:column;gap:18px;min-width:0}
.board-intro{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap}
.intro-text{display:flex;flex-direction:column;gap:8px}
.badge{display:inline-block;width:max-content;padding:4px 12px;border-radius:999px;
  border:1px solid var(--line);color:var(--accent);font-size:11.5px;letter-spacing:.06em}
.board-intro h1{font-size:clamp(24px,4.5vw,34px);line-height:1.1}
.board-intro p{color:var(--sub);font-size:14px;max-width:520px;line-height:1.7}
.search-wrap{flex:1;min-width:200px;max-width:320px}
#searchInput{
  width:100%;padding:11px 14px;border-radius:12px;font-size:14px;
  background:var(--panel);border:1px solid var(--line);color:var(--ink);outline:none;
}
#searchInput:focus{border-color:var(--accent)}

/* ---------- 投稿フォーム ---------- */
.composer{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.composer-toggle{
  width:100%;display:flex;align-items:center;gap:10px;
  padding:16px 18px;background:transparent;border:0;color:var(--ink);
  font-size:15px;font-weight:700;cursor:pointer;font-family:inherit;text-align:start;
}
.composer-toggle .plus{
  width:26px;height:26px;border-radius:8px;display:grid;place-items:center;font-size:18px;color:#021018;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
}
.composer-form{padding:0 18px 18px;display:flex;flex-direction:column;gap:12px}
.composer-row{display:flex;gap:10px;flex-wrap:wrap}
.composer-row input,.composer-row select,.composer-form textarea{
  background:var(--bg2);border:1px solid var(--line);color:var(--ink);
  border-radius:10px;padding:10px 12px;font-size:14px;outline:none;font-family:inherit;
}
.composer-row input:focus,.composer-row select:focus,.composer-form textarea:focus{border-color:var(--accent)}
.composer-row .f-name{flex:1 1 160px}
.composer-row select{flex:1 1 130px;cursor:pointer}
.composer-row select option{background:var(--panel-solid)}
.composer-form textarea{width:100%;resize:vertical;line-height:1.7}
.composer-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.counter{font-size:12px;color:var(--sub)}
.composer-actions{display:flex;gap:10px}
.composer-rule{font-size:11.5px;color:var(--sub);line-height:1.6;opacity:.85}

.btn-primary,.btn-ghost{
  border:0;border-radius:999px;padding:10px 22px;font-size:14px;font-weight:700;
  cursor:pointer;font-family:inherit;transition:.15s;
}
.btn-primary{color:#021018;background:linear-gradient(135deg,var(--accent),var(--accent2));
  box-shadow:0 8px 24px rgba(39,208,200,.25)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--accent)}

/* ---------- リストツールバー ---------- */
.list-toolbar{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.sort-tabs{display:flex;gap:4px;background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:4px}
.sort-tab{
  background:transparent;border:0;color:var(--sub);font-size:13px;font-weight:700;
  padding:7px 16px;border-radius:999px;cursor:pointer;font-family:inherit;transition:.15s;
}
.sort-tab.active{background:rgba(39,208,200,.16);color:var(--ink)}
.active-filters{display:flex;gap:6px;flex-wrap:wrap;flex:1;min-width:0}
.active-filters .af-chip{
  display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--ink);
  background:rgba(26,143,255,.15);border:1px solid var(--line);border-radius:999px;padding:4px 10px;
}
.active-filters .af-chip .x{cursor:pointer;opacity:.7}
.active-filters .af-chip .x:hover{opacity:1}
.result-count{font-size:12.5px;color:var(--sub);margin-inline-start:auto}

/* ---------- 投稿カード ---------- */
.thread-list{display:flex;flex-direction:column;gap:12px}
.post{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 18px;display:flex;flex-direction:column;gap:10px;
  animation:rise .3s ease both;
}
@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.post-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.post-flag{font-size:20px;line-height:1}
.post-name{font-weight:700;font-size:14.5px}
.post-tags{display:flex;gap:6px;flex-wrap:wrap}
.tag{font-size:11px;padding:3px 9px;border-radius:999px;border:1px solid var(--line);color:var(--sub)}
.tag.lang{color:var(--accent)}
.tag.cat{color:var(--accent2)}
.post-time{font-size:11.5px;color:var(--sub);margin-inline-start:auto}
.post-body{font-size:14.5px;line-height:1.85;white-space:pre-wrap;word-break:break-word}
.post-body.translated{border-inline-start:2px solid var(--accent);padding-inline-start:12px;color:var(--ink)}
.post-orig{font-size:13px;color:var(--sub);line-height:1.8;white-space:pre-wrap;
  border-top:1px dashed var(--line);padding-top:8px;margin-top:2px;display:none}
.post-orig.show{display:block}
.post-foot{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.act{
  display:inline-flex;align-items:center;gap:6px;
  background:transparent;border:1px solid var(--line);color:var(--sub);
  border-radius:999px;padding:6px 13px;font-size:12.5px;cursor:pointer;font-family:inherit;transition:.15s;
}
.act:hover{border-color:var(--line-strong);color:var(--ink)}
.act.on{border-color:var(--accent);color:var(--accent)}
.act .ico{font-size:13px}
.act.report:hover{border-color:var(--danger);color:var(--danger)}
.translate-note{font-size:11px;color:var(--sub);opacity:.8;margin-inline-start:4px}

/* ---------- 空状態 ---------- */
.empty-state{text-align:center;padding:56px 24px;color:var(--sub)}
.empty-mark{font-size:44px;display:block;margin-bottom:14px;opacity:.7}
.empty-state p{font-size:14px}

/* ---------- フッター ---------- */
.site-footer{
  border-top:1px solid var(--line);padding:18px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
  color:var(--sub);font-size:12.5px;
}

/* ---------- レスポンシブ ---------- */
@media (max-width:900px){
  .board-shell{grid-template-columns:1fr;padding:18px}
  .sidebar{
    position:static;max-height:none;overflow:visible;
    flex-direction:column;gap:16px;
    background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px;
  }
}
@media (max-width:560px){
  .site-header{padding:12px 16px;flex-wrap:wrap}
  .brand-name{font-size:14px}
  .site-nav a{margin-inline-start:14px;font-size:13px}
  .board-shell{padding:14px;gap:16px}
  .search-wrap{max-width:none}
  .composer-row{flex-direction:column}
  .composer-row .f-name,.composer-row select{flex:1 1 auto;width:100%}
  .result-count{margin-inline-start:0}
  .post-time{margin-inline-start:0;flex-basis:100%}
}