:root{--bg:#f5f7fa;--surface:#fff;--text:#1f2937;--muted:#6b7280;--border:#d9dee6;--primary:#1f3a5f;--primary-hover:#17304f;--left:#2563eb;--left-bg:#eff5ff;--right:#ea580c;--right-bg:#fff4ec;--danger:#c62828;--ok:#1b7a3d;--ok-bg:#eaf7ee;--radius:8px}*{box-sizing:border-box}html,body{height:100%}body{color:var(--text);background:var(--bg);flex-direction:column;min-height:100dvh;margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;font-size:15px;line-height:1.5;display:flex}button{font:inherit;cursor:pointer}button:focus-visible,input:focus-visible,a:focus-visible,label:focus-within{outline-offset:1px;outline:2px solid #4c8bf5}header.app-header{background:var(--surface);border-bottom:1px solid var(--border);flex-wrap:wrap;align-items:center;gap:8px 16px;padding:8px 16px;display:flex}.app-title{color:var(--primary);white-space:nowrap;margin:0;font-size:16px;font-weight:700}.app-title 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