:root{--bg:#f3f6fb;--panel:#ffffff;--panel-soft:#f7f9fc;--text:#111827;--muted:#667085;--quiet:#8a94a6;--border:#e2e8f0;--accent:#2563eb;--accent-strong:#1d4ed8;--danger:#b42318;--success:#177245;--radius:10px}*{box-sizing:border-box}html{color-scheme:light}body{min-height:100vh;margin:0;background:linear-gradient(180deg,#eef3fb 0,rgba(243,246,251,0) 260px),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,select,textarea{font:inherit}a{color:inherit;text-decoration:none}.shell{width:min(1180px,calc(100% - 48px));margin:0 auto;padding:18px 0 64px}.topbar{position:-webkit-sticky;position:sticky;top:12px;z-index:20;justify-content:space-between;gap:16px;margin-bottom:16px;border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px;background:rgba(255,255,255,.92);box-shadow:0 10px 24px rgba(15,23,42,.07);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.brand,.topbar{display:flex;align-items:center}.brand{gap:10px;color:var(--text);font-size:16px;font-weight:720;letter-spacing:0}.brand-mark{width:30px;height:30px;border:1px solid #c4d1e5;border-radius:9px;background:linear-gradient(145deg,#ffffff,#d7e2f7 45%,#2563eb);box-shadow:0 8px 16px rgba(37,99,235,.18)}.nav{display:flex;align-items:center;gap:6px}.nav form{display:contents}.ghost-button,.nav a,.primary-button{display:inline-flex;align-items:center;justify-content:center;min-height:38px;border:1px solid var(--border);border-radius:var(--radius);padding:8px 12px;color:var(--muted);background:#ffffff;font-size:13px;font-weight:560;cursor:pointer;line-height:1.2;white-space:nowrap}.primary-button{border-color:var(--accent-strong);color:#ffffff;background:var(--accent-strong);box-shadow:0 8px 18px rgba(29,78,216,.16)}.primary-button:disabled{cursor:not-allowed;opacity:.56}.ghost-button:hover,.nav 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