:root{--ink:#1f2a3a;--sub:#5a6575;--line:#dde3ea;--bg:#f4f6f9;--accent:#2f5bb7;--warn:#9a3b2c;color-scheme:light}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font-family:"Hiragino Sans","Yu Gothic UI","Meiryo",system-ui,sans-serif;font-size:15px;line-height:1.7}
.bar{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;padding:10px 16px;background:#fff;border-bottom:1px solid var(--line)}
.bar strong{font-size:16px;word-break:break-all}
.muted{color:var(--sub);font-size:13px}
main{padding:16px}
.card{max-width:420px;margin:12vh auto 0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px}
.card h1{font-size:18px;margin:0 0 8px}
form{display:flex;gap:8px;margin-top:14px}
input{flex:1;min-width:0;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font:inherit}
button{padding:10px 16px;border:0;border-radius:8px;background:var(--accent);color:#fff;font:inherit;cursor:pointer}
button:disabled{opacity:.6;cursor:default}
.error{color:var(--warn);font-size:13px;min-height:1.5em;margin:8px 0 0}
#viewer{position:relative;max-width:1100px;margin:0 auto;user-select:none;-webkit-user-select:none}
#content canvas,#content img,#content video{display:block;max-width:100%;height:auto;margin:0 auto 12px;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.12);-webkit-user-drag:none}
#content pre{white-space:pre-wrap;word-break:break-word;background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px;margin:0;user-select:text;-webkit-user-select:text}
#watermark{position:fixed;inset:0;pointer-events:none;overflow:hidden;opacity:.06;color:#000;font-size:14px;display:flex;flex-wrap:wrap;align-content:flex-start;gap:260px 360px;padding:120px;transform:rotate(-24deg) scale(1.4);transform-origin:center}
#watermark span{white-space:nowrap}
@media print{body{display:none}}
#viewer:has(.html-frame){max-width:none}
.html-frame{display:block;width:100%;height:calc(100vh - 124px);border:0;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.12)}
.notice{max-width:520px;margin:12vh auto 0;text-align:center;color:var(--sub)}
#watermark{z-index:5}
.notice button{margin-top:12px}
.html-note{margin:0 0 8px}