:root{color-scheme:light dark;--bg:#f0f2f5;--panel:#fff;--panel-alt:#f8f9fb;--text:#1a1f2e;--text-sub:#64748b;--border:#dce1e9;--primary:#0d9488;--primary-hover:#0f766e;--primary-glow:rgba(13,148,136,.25);--danger:#ef4444;--success:#10b981;--radius:14px;--radius-sm:10px;--shadow-card:0 8px 32px rgba(15,23,42,.07);--shadow-float:0 16px 48px rgba(15,23,42,.12);--transition:.22s cubic-bezier(.4,0,.2,1);--font:"Hiragino Sans","Yu Gothic","Noto Sans JP","Meiryo",system-ui,sans-serif}@media (prefers-color-scheme:dark){:root{--bg:#0f1117;--panel:#1a1d2e;--panel-alt:#232638;--text:#e2e8f0;--text-sub:#94a3b8;--border:#2e3348;--primary:#2dd4bf;--primary-hover:#14b8a6;--primary-glow:rgba(45,212,191,.2);--shadow-card:0 8px 32px rgba(0,0,0,.3);--shadow-float:0 16px 48px rgba(0,0,0,.5)}}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%}body,html{background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.6}.page{min-height:100dvh;padding:2.5rem 1.25rem 4rem;background:radial-gradient(ellipse at 20% 0,rgba(13,148,136,.08) 0,transparent 50%),radial-gradient(ellipse at 80% 100%,rgba(45,212,191,.06) 0,transparent 50%),var(--bg)}.panel{width:min(1020px,100%);margin:0 auto;background:var(--panel);border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow-card);padding:2rem 2.2rem}.header{text-align:center;margin-bottom:1.8rem}.header h1{font-size:clamp(1.5rem,2vw + 1rem,2.2rem);font-weight:700;letter-spacing:-.02em;background:linear-gradient(135deg,var(--primary),#6366f1);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.header .subtitle{margin-top:.4rem;color:var(--text-sub);font-size:.92rem;line-height:1.5}.form{display:grid;grid-gap:1.2rem;gap:1.2rem}.meta-grid{display:grid;grid-gap:1rem;gap:1rem;grid-template-columns:repeat(3,minmax(0,1fr))}label{display:grid;grid-gap:.35rem;gap:.35rem;font-size:.88rem;font-weight:600;color:var(--text)}input[type=text],textarea{width:100%;border:1px solid var(--border);border-radius:var(--radius-sm);padding:.65rem .8rem;color:var(--text);background:var(--panel-alt);font:inherit;font-size:.92rem;transition:border-color var(--transition),box-shadow var(--transition)}textarea{resize:vertical;line-height:1.55;font-family:SF Mono,Fira Code,Consolas,monospace;font-size:.85rem}input[type=text]:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-glow)}input[type=text]::placeholder,textarea::placeholder{color:var(--text-sub);opacity:.7}.hint{font-size:.82rem;padding:.5rem 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h1{font-size:1.5rem}.preview-pane h2{font-size:1.25rem}.preview-pane h3{font-size:1.1rem}.preview-pane p{margin:.6em 0}.preview-pane blockquote{margin:1em 0;padding:.6em 1em;border-left:3px solid var(--primary);color:var(--text-sub);background:var(--panel);border-radius:0 var(--radius-sm) var(--radius-sm) 0}.preview-pane table{width:100%;border-collapse:collapse;margin:1em 0}.preview-pane td,.preview-pane th{border:1px solid var(--border);padding:.45em .6em;text-align:left;font-size:.88rem}.preview-pane th{background:var(--panel-alt);font-weight:600}.preview-pane ol,.preview-pane ul{margin:.6em 0;padding-left:1.6em}.preview-pane img{max-width:100%;border-radius:8px}.preview-pane .page-break{height:0;margin:1.2rem 0;border-top:2px dashed var(--primary)}.preview-pane code{background:var(--panel);border:1px solid var(--border);border-radius:4px;padding:.1em .35em;font-size:.88em}.submit-btn{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:.6rem;width:100%;border:none;border-radius:var(--radius);background:linear-gradient(135deg,var(--primary),#6366f1);color:#fff;font:inherit;font-size:1rem;font-weight:700;padding:.85rem 1.5rem;cursor:pointer;transition:transform var(--transition),box-shadow var(--transition),opacity var(--transition);box-shadow:0 4px 14px var(--primary-glow)}.submit-btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 6px 22px var(--primary-glow)}.submit-btn:active:not(:disabled){transform:translateY(0)}.submit-btn:disabled{opacity:.55;cursor:not-allowed}.spinner{display:inline-block;width:18px;height:18px;border:2.5px solid hsla(0,0%,100%,.35);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.message-container{display:flex;align-items:flex-start;gap:.6rem;padding:.7rem 1rem;border-radius:var(--radius-sm);font-size:.88rem;line-height:1.5;animation:fadeSlideIn .3s ease-out}.message-container.success{background:rgba(16,185,129,.1);border:1px solid rgba(16,185,129,.25);color:var(--success)}.message-container.error{background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.25);color:var(--danger)}.message-container.warning{background:rgba(245,158,11,.1);border:1px solid rgba(245,158,11,.25);color:#f59e0b}@keyframes fadeSlideIn{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}@media (max-width:768px){.meta-grid{grid-template-columns:1fr}.panel{padding:1.2rem 1rem;border-radius:14px}.page{padding:1.5rem .75rem 3rem}}