:root{--bg: #f4f6f8;--surface: #ffffff;--surface-soft: #f8fafc;--ink: #18202a;--muted: #5d6673;--line: #d8dee7;--line-strong: #b8c1ce;--focus: #2f6fbb;--shadow: 0 12px 28px rgba(25, 34, 45, .1)}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg);font:15px/1.55 Arial,Helvetica,sans-serif;overflow:hidden}button,input,textarea{font:inherit}a{color:#245aa0;text-decoration:none}a:hover{text-decoration:underline}.app{height:100vh;display:grid;grid-template-rows:auto 1fr}.topbar{background:var(--surface);border-bottom:1px solid var(--line);padding:14px 18px;display:grid;grid-template-columns:minmax(260px,1fr) auto;gap:16px;align-items:center;z-index:5}.title-block h1{margin:0;font-size:1.28rem;line-height:1.2}.title-block p{margin:4px 0 0;color:var(--muted);font-size:.92rem}.toolbar,.utility-actions,.inline-links{display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:flex-end}.tool-button,.upload-button{min-height:36px;border:1px solid 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