*{box-sizing:border-box}
body{margin:0;font-family:'lucida grande',tahoma,verdana,arial,sans-serif;font-size:13px;background:var(--bg);color:var(--fg);transition:background .15s,color .15s}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}

[data-theme="modern"]{--bg:#f5f6f8;--fg:#1b1e25;--bar:#2c3446;--bar-fg:#fff;--post-bg:#ffffff;--post-border:#e2e5eb;--quote:#3d8b5f;--link:#2b5fc7;--input-bg:#fff;--muted:#767c8a;--accent:#e0663d;--radius:10px;--shadow:0 1px 3px rgba(20,22,30,.08)}
[data-theme="yotsuba"]{--bg:#ffffee;--fg:#800000;--bar:#ff8000;--bar-fg:#fff;--post-bg:#f0e0d6;--post-border:#d9bfb7;--quote:#789922;--link:#34345c;--input-bg:#fff;--muted:#707070;--accent:#ff8000;--radius:4px;--shadow:none}
[data-theme="yotsuba-b"]{--bg:#eef2ff;--fg:#0f0c5d;--bar:#8b98d8;--bar-fg:#fff;--post-bg:#d6daf0;--post-border:#b7c5d9;--quote:#789922;--link:#34345c;--input-bg:#fff;--muted:#707070;--accent:#8b98d8;--radius:4px;--shadow:none}
[data-theme="futaba"]{--bg:#ffffee;--fg:#aa0000;--bar:#f0c8c0;--bar-fg:#800000;--post-bg:#f0e0d6;--post-border:#d9bfb7;--quote:#789922;--link:#0000ee;--input-bg:#fff;--muted:#707070;--accent:#aa0000;--radius:4px;--shadow:none}
[data-theme="facebook"]{--bg:#e9eaed;--fg:#333;--bar:#3b5998;--bar-fg:#fff;--post-bg:#fff;--post-border:#d8dfea;--quote:#789922;--link:#3b5998;--input-bg:#fff;--muted:#808080;--accent:#3b5998;--radius:2px;--shadow:none}
[data-theme="tomorrow"]{--bg:#0d0d0d;--fg:#e8e8e8;--bar:#000;--bar-fg:#ff8800;--post-bg:#161616;--post-border:#333;--quote:#ff8800;--link:#ffab40;--input-bg:#111;--muted:#888;--accent:#ff8800;--radius:8px;--shadow:0 1px 4px rgba(0,0,0,.6)}

header.topbar{background:var(--bar);color:var(--bar-fg);padding:10px 16px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;position:sticky;top:0;z-index:40;box-shadow:var(--shadow);border-bottom:1px solid #29447e}
header.topbar h1{margin:0;font-size:19px;letter-spacing:.2px;display:flex;align-items:center;gap:8px}
header.topbar h1 a{color:inherit;display:flex;align-items:center;gap:8px}
.logo-mark{width:24px;height:24px;border-radius:6px}
.board-nav{display:flex;gap:10px;flex-wrap:wrap;font-size:12px}
.board-nav a{color:var(--bar-fg);opacity:.9}
.board-nav a:hover{opacity:1}
select#themeSelect{font-size:12px;padding:4px 6px;border-radius:6px;border:none}
.search-form{display:flex;gap:4px}
.search-form input{padding:6px 10px;border-radius:6px;border:1px solid var(--post-border);font-size:12px;min-width:160px}
.search-form button{padding:6px 10px;border-radius:6px;border:none;background:var(--accent);color:#fff;font-size:12px;cursor:pointer}

main{max-width:960px;margin:0 auto;padding:14px}
.board-title{text-align:center;margin:16px 0 4px;font-size:28px;color:var(--fg);font-weight:800}
.board-desc{text-align:center;color:var(--muted);margin-bottom:16px}
.theory-line{max-width:640px;margin:0 auto 18px;text-align:center;color:var(--muted);font-size:12px;line-height:1.5}
.howto-block{max-width:640px;margin:22px auto 0;background:var(--post-bg);border:1px solid var(--post-border);border-radius:var(--radius);padding:14px 18px}
.howto-title{margin:0 0 8px;font-size:14px}
.howto-block p{margin:0;font-size:12px;line-height:1.65;color:var(--fg)}
.howto-block code{background:var(--input-bg);border:1px solid var(--post-border);border-radius:4px;padding:0 4px;font-size:11px}
.maintenance-banner{max-width:480px;margin:0 auto 16px;text-align:center;background:var(--post-bg);border:1px solid var(--post-border);border-radius:var(--radius);padding:14px;font-size:13px;color:var(--fg)}
.spinner{width:36px;height:36px;border:3px solid var(--post-border);border-top-color:var(--accent);border-radius:50%;margin:40px auto 12px;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.out-url{background:var(--input-bg);border:1px solid var(--post-border);border-radius:8px;padding:10px;font-family:monospace;font-size:12px;word-break:break-all;margin-top:10px}
.ad-slot:empty{display:none}
.ad-slot{max-width:960px;margin:0 auto;text-align:center;overflow:hidden}
.add-media-btn{background:none;border:1px dashed var(--post-border);color:var(--muted);border-radius:6px;padding:6px 10px;font-size:11px;cursor:pointer;margin-top:4px}
#mediaUrlsWrap input{margin-bottom:5px}
.nsfw-gate{max-width:420px;margin:60px auto;text-align:center;background:var(--post-bg);border:1px solid var(--post-border);border-radius:var(--radius);padding:24px}
.nsfw-gate h2{color:#d33;margin-top:0}
.nsfw-gate button{margin:6px}

.board-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.board-card{border:1px solid var(--post-border);background:var(--post-bg);padding:16px;text-align:center;border-radius:var(--radius);box-shadow:var(--shadow)}
.board-card a{font-weight:700;font-size:15px}
.board-card p{margin:6px 0 0;color:var(--muted);font-size:11px}

.postform{border:1px solid var(--post-border);background:var(--post-bg);padding:14px;margin-bottom:18px;border-radius:var(--radius);box-shadow:var(--shadow)}
.qr-toggle{position:fixed;right:16px;bottom:16px;z-index:60;padding:13px 22px;border-radius:26px;background:var(--accent);color:#fff;border:none;font-size:14px;font-weight:700;box-shadow:0 2px 12px rgba(0,0,0,.35);cursor:pointer}
.qr-box{position:fixed;right:16px;bottom:80px;z-index:60;width:min(360px,calc(100vw - 32px));max-height:75vh;overflow-y:auto;background:var(--post-bg);border:1px solid var(--post-border);border-radius:var(--radius);box-shadow:0 8px 28px rgba(0,0,0,.4)}
.qr-header{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;font-weight:700;font-size:13px;border-bottom:1px solid var(--post-border);position:sticky;top:0;background:var(--post-bg);border-radius:var(--radius) var(--radius) 0 0}
.qr-close{background:none;border:none;font-size:16px;cursor:pointer;color:var(--muted);line-height:1;padding:2px 4px}
.qr-close:hover{color:var(--fg)}
.qr-box .postform{border:none;box-shadow:none;margin:0;padding:12px;border-radius:0}
@media(max-width:640px){
  .qr-box{left:8px;right:8px;bottom:0;width:auto;max-height:70vh;border-bottom-left-radius:0;border-bottom-right-radius:0}
  .qr-toggle{right:12px;bottom:12px}
}
.form-row{display:flex;flex-direction:column;gap:5px;margin-bottom:12px}
.form-row label{color:var(--fg);font-weight:700;font-size:12px}
.form-row input[type=text],.form-row input[type=url],.form-row textarea{width:100%;background:var(--input-bg);color:var(--fg);border:1px solid var(--post-border);border-radius:8px;padding:10px;font-family:inherit;font-size:16px}
.form-row textarea{min-height:110px;resize:vertical}
.form-row-inline{flex-direction:row;align-items:center}
.checkbox-label{display:flex;align-items:center;gap:6px;font-weight:400 !important;font-size:13px !important}
.checkbox-label input{width:18px;height:18px}
.form-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.postform button{background:var(--accent);color:#fff;border:none;border-radius:8px;padding:12px 22px;cursor:pointer;font-weight:700;font-size:15px;flex:1 1 auto;min-width:120px}
.postform .err{color:#d33;font-size:12px;margin-top:8px}
.postform .hint{font-size:11px;color:var(--muted)}
.charcount{font-size:10px;color:var(--muted);text-align:right}

.catalog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px}
.thread-tile{border:1px solid var(--post-border);background:var(--post-bg);padding:8px;font-size:12px;border-radius:var(--radius);cursor:pointer;box-shadow:var(--shadow);transition:transform .1s}
.thread-tile:hover{transform:translateY(-2px)}
.thread-tile img,.thread-tile video{max-width:100%;max-height:150px;display:block;margin-bottom:5px;object-fit:cover;border-radius:6px}
.thread-tile .meta{color:var(--muted);font-size:10px;margin-bottom:3px}
.thread-tile .subject,.search-result .subject{font-weight:700;font-size:12px;margin-bottom:2px}
.thread-tile .snippet{max-height:60px;overflow:hidden}
.thread-subject{margin:0 0 8px;font-size:20px;font-weight:800}
.thread-subject.is-admin{color:#d33}
.pin-badge{color:var(--accent);font-weight:700;font-size:10px}
.admin-badge{color:#fff;background:#d33;display:inline-block;font-weight:700;font-size:10px;padding:1px 6px;border-radius:4px;margin-bottom:3px}
.lock-badge{color:var(--muted);font-weight:700;font-size:10px}
.thread-tile.is-admin{border-color:#d33;box-shadow:0 0 0 1px #d33 inset}
.admin-thread-banner{background:#d33;color:#fff;font-weight:700;font-size:12px;padding:8px 12px;border-radius:var(--radius);margin-bottom:10px;text-align:center}

.post{border:1px solid var(--post-border);background:var(--post-bg);padding:10px 12px;margin-bottom:9px;border-radius:var(--radius);box-shadow:var(--shadow);transition:outline .1s}
.post.op{background:transparent;border:none;box-shadow:none;padding:4px 0 10px}
.post.post-highlight{outline:2px solid var(--accent)}
.post .postinfo{font-size:12px;margin-bottom:5px;display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.post .postinfo .name{color:#3b5998;font-weight:700}
.post .postinfo .trip{color:#228}
.post .postinfo .num{color:var(--muted)}
.post .postinfo a.postnum-link{color:var(--muted)}
.post .postinfo a.reply-link{font-size:11px}
.poster-id{font-family:monospace;font-size:10px;color:#fff;padding:1px 6px;border-radius:10px;cursor:pointer}
.poster-id.id-highlight{outline:2px solid #fff;outline-offset:1px}
.post .comment{white-space:pre-wrap;word-wrap:break-word;line-height:1.45}
.post .comment .quote{color:var(--quote)}
.post .comment .greentext{color:var(--quote)}
.post img.media,.post video.media{max-width:280px;max-height:280px;border-radius:8px;cursor:zoom-in;display:block}
.post img.media.expanded{max-width:90vw;max-height:85vh;cursor:zoom-out}
.media-wrap{position:relative;float:left;margin:0 12px 8px 0}
.media-btn{position:absolute;top:4px;z-index:5;background:rgba(0,0,0,.55);color:#fff;border:none;border-radius:4px;width:26px;height:26px;font-size:13px;cursor:pointer;line-height:1}
.media-open{left:4px}
.media-dl{right:4px}
.media-placeholder{width:200px;height:130px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;background:var(--input-bg);border:1px dashed var(--post-border);border-radius:8px;cursor:pointer;color:var(--muted);font-size:12px;float:left;margin:0 12px 8px 0}
.ph-icon{font-size:20px}
.post::after{content:"";display:table;clear:both}
.yt-embed{max-width:400px;aspect-ratio:16/9;border-radius:8px}

.quote-preview{position:absolute;border:1px solid var(--post-border);background:var(--post-bg);padding:10px;max-width:320px;box-shadow:0 4px 14px rgba(0,0,0,.25);z-index:50;border-radius:var(--radius)}

.search-list{display:flex;flex-direction:column;gap:8px}
.search-result{display:block;border:1px solid var(--post-border);background:var(--post-bg);padding:10px;border-radius:var(--radius);box-shadow:var(--shadow);color:var(--fg)}
.search-result:hover{text-decoration:none;outline:1px solid var(--accent)}
.search-result .meta{color:var(--muted);font-size:11px;margin-bottom:4px}

.stats-box{display:flex;align-items:center;gap:8px;justify-content:center;font-size:11px;color:var(--muted);flex-wrap:wrap;margin-bottom:6px}
.pulse-dot{width:8px;height:8px;border-radius:50%;background:#2a7;box-shadow:0 0 0 rgba(42,170,119,.5);animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(42,170,119,.5)}70%{box-shadow:0 0 0 6px rgba(42,170,119,0)}100%{box-shadow:0 0 0 0 rgba(42,170,119,0)}}
.footer-links{font-size:11px}

.board-banner-img{display:block;max-width:100%;max-height:200px;margin:10px auto;border-radius:var(--radius);box-shadow:var(--shadow)}
.board-quote{text-align:center;font-style:italic;color:var(--muted);font-size:12px;margin:-6px 0 14px}

footer{text-align:center;color:var(--muted);font-size:11px;padding:16px}
.legal-links{margin-top:4px}
.legal-panel{max-width:600px;margin:10px auto 0;text-align:left;background:var(--post-bg);border:1px solid var(--post-border);border-radius:var(--radius);padding:12px 16px;font-size:12px;line-height:1.5}
.legal-panel h3{margin:0 0 6px;font-size:13px;color:var(--fg)}
.back-link{display:inline-block;margin-bottom:10px;font-size:12px}
.thread-nav{display:flex;gap:14px;font-size:12px;font-weight:700;margin-bottom:10px;padding:6px 0}
.thread-nav a{color:var(--link)}

@media(max-width:640px){
  header.topbar{gap:6px}
  .search-form input{min-width:0;flex:1}
  .board-grid{grid-template-columns:repeat(auto-fill,minmax(120px,1fr))}
  .catalog-grid{grid-template-columns:repeat(auto-fill,minmax(130px,1fr))}
  .post img.media,.post video.media{max-width:100%}
  .media-wrap{float:none}
  .postinfo{font-size:11px}
  .form-actions{flex-direction:column;align-items:stretch}
  .postform button{width:100%}
  .thread-nav{font-size:11px;gap:10px}
}

.postform button,.qr-toggle,.search-form button{background:linear-gradient(#5b74a8,#3b5998);border:1px solid #29447e!important;border-radius:2px!important;text-shadow:0 -1px 0 rgba(0,0,0,.3)}
.search-form input{border-radius:2px}
.board-title{font-size:22px}
.board-card,.thread-tile,.post{border-color:#d8dfea}
.post.op{border-bottom:1px solid #e9eaed}