:root{--brand-primary:#2b6ef2;--brand-on-primary:#ffffff;--brand-bg:#f5f6f8;--brand-surface:#ffffff;--brand-text:#1a1d21;--brand-muted:#6b7280;--brand-border:#e5e7eb}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--brand-bg);color:var(--brand-text);font-family:-apple-system,BlinkMacSystemFont,Apple SD Gothic Neo,Pretendard,Segoe UI,Roboto,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{font-family:inherit}.app-shell{max-width:480px;margin:0 auto;min-height:100vh;background:var(--brand-bg);display:flex;flex-direction:column}.app-main{flex:1 1;padding:16px 16px 80px}.card{background:var(--brand-surface);border:1px solid var(--brand-border);border-radius:12px;padding:16px}.btn-primary{background:var(--brand-primary);color:var(--brand-on-primary);border:none;border-radius:10px;padding:14px 16px;font-size:16px;font-weight:600;width:100%;cursor:pointer}.btn-primary:disabled{opacity:.5}.muted{color:var(--brand-muted)}.input{width:100%;padding:12px 14px;border:1px solid var(--brand-border);border-radius:10px;font-size:16px;background:var(--brand-surface);color:var(--brand-text)}