:root{--color-navy:#0f1c2e;--color-navy-light:#1a2e46;--color-navy-hover:#243d5e;--color-accent:#2563eb;--color-accent-hover:#1d4ed8;--color-accent-muted:#dbeafe;--color-surface:#f8fafc;--color-surface-2:#f1f5f9;--color-border:#e2e8f0;--color-border-dark:#cbd5e1;--color-text:#0f172a;--color-text-muted:#64748b;--color-text-light:#94a3b8;--color-nav-text:#94a3b8;--color-nav-text-active:#fff;--color-success:#16a34a;--color-success-bg:#dcfce7;--color-warning:#d97706;--color-warning-bg:#fef3c7;--color-danger:#dc2626;--color-danger-bg:#fee2e2;--color-info:#0369a1;--color-info-bg:#e0f2fe;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--shadow-sm:0 1px 2px #0000000f;--shadow-md:0 4px 12px #00000014;--shadow-lg:0 8px 24px #0000001f;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", sans-serif}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;font-size:14px}html,body{height:100%}body{font-family:var(--font-sans);background:var(--color-surface);color:var(--color-text);line-height:1.5}a{color:inherit;text-decoration:none}button{cursor:pointer;background:0 0;border:none;font-family:inherit}input,textarea,select{font-family:inherit;font-size:inherit}h1{font-size:1.5rem;font-weight:700}h2{font-size:1.25rem;font-weight:600}h3{font-size:1.1rem;font-weight:600}.app-error-page{background:var(--color-surface);place-items:center;min-height:100vh;padding:24px;display:grid}.app-error-card{border:1px solid var(--color-border);border-radius:var(--radius-lg);width:min(100%,480px);box-shadow:var(--shadow-lg);background:#fff;padding:32px}.app-error-eyebrow{color:var(--color-warning);letter-spacing:.1em;text-transform:uppercase;margin:0 0 12px;font-size:.75rem;font-weight:700}.app-error-card h1{color:var(--color-text);margin:0;font-size:1.75rem}.app-error-message{color:var(--color-text-muted);margin:12px 0 24px;line-height:1.6}.app-error-card button{border-radius:var(--radius-md);background:var(--color-accent);color:#fff;cursor:pointer;border:0;padding:10px 20px;font-weight:600}